.modal-card {
    background: #fff;
    border-radius: 16px;
    box-shadow: 0 4px 24px rgba(30, 41, 59, 0.14);
    padding: 2.5em 2em 2em 2em;
    max-width: 380px;
    margin: auto;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.modal-title {
    margin-bottom: 0.75em;
    color: #222;
    font-size: 1.35em;
    font-weight: 600;
    text-align: center;
}

.modal-text {
    margin-bottom: 2em;
    color: #555;
    text-align: center;
    font-size: 1.05em;
    line-height: 1.6;
}

.modal-btn {
    width: 100%;
    margin-bottom: 0.75em;
    font-size: 1em;
    padding: 0.7em 0;
    border-radius: 8px;
}

.modal-btn:last-child {
    margin-bottom: 0;
}

/* Primary CTA button (teal) */
.modal-btn.btn-primary {
    background: #14b8a6;
    color: #fff;
    border: none;
    box-shadow: 0 1px 4px rgba(20, 184, 166, 0.08);
    font-weight: 600;
    transition: background 0.2s;
}
.modal-btn.btn-primary:hover,
.modal-btn.btn-primary:focus {
    background: #0f766e;
}

/* Secondary button (neutral outline) */
.modal-btn.btn-secondary {
    background: #fff;
    color: #222;
    border: 1.5px solid #cbd5e1;
    font-weight: 500;
    transition: border-color 0.2s, color 0.2s;
}
.modal-btn.btn-secondary:hover,
.modal-btn.btn-secondary:focus {
    border-color: #14b8a6;
    color: #14b8a6;
}
* {
    box-sizing: border-box;
}

:root {
    --background: #e8efed;
    --surface: #ffffff;
    --surface-elevated: #f6faf9;
    --text-strong: #1a2825;
    --text-muted: #5a6f69;
    --primary: #2ac6c4;
    --primary-hover: #24b2b0;
    --primary-active: #1e9d9b;
    --subtle-tint: #eaf5f2;
    --success: #1f7f72;
    --danger: #a14a43;
    --border: #cfdad6;
    --border-strong: #becbc7;
    --elevation-0: none;
    --elevation-1: 0 1px 1px rgba(10, 31, 27, 0.02), 0 5px 10px rgba(10, 31, 27, 0.045), 0 12px 22px rgba(10, 31, 27, 0.028);
    --elevation-2: 0 1px 1px rgba(9, 29, 25, 0.035), 0 10px 18px rgba(9, 29, 25, 0.09), 0 22px 36px rgba(9, 29, 25, 0.058);
    --elevation-3: 0 1px 2px rgba(8, 26, 23, 0.06), 0 8px 16px rgba(8, 26, 23, 0.16), 0 16px 28px rgba(8, 26, 23, 0.11);
    --elevation-header: 0 1px 0 rgba(11, 31, 27, 0.05), 0 6px 14px rgba(11, 31, 27, 0.035);
    --elevation-btn: 0 1px 1px rgba(8, 32, 28, 0.05), 0 5px 12px rgba(8, 32, 28, 0.14);
    --elevation-btn-hover: 0 2px 2px rgba(8, 30, 26, 0.05), 0 10px 18px rgba(8, 30, 26, 0.16);
    --elevation-btn-active: 0 1px 2px rgba(8, 30, 26, 0.16);
    --elevation-btn-secondary: 0 1px 1px rgba(10, 28, 24, 0.03);
    --elevation-micro: 0 1px 1px rgba(9, 30, 26, 0.02);
    --focus-ring: 0 0 0 3px rgba(10, 168, 146, 0.14);
    --focus-ring-strong: 0 0 0 4px rgba(10, 168, 146, 0.18);
    --radius-xs: 7px;
    --radius-sm: 10px;
    --radius-md: 14px;
    --radius-lg: 18px;
    --radius-pill: 999px;
    --transition-fast: 160ms cubic-bezier(0.22, 0.61, 0.36, 1);
    --transition-std: 180ms cubic-bezier(0.22, 0.61, 0.36, 1);
    --bg: var(--background);
    --space-1: 8px;
    --space-2: 16px;
    --space-3: 24px;
    --space-4: 28px;
    --space-5: 32px;
    --space-6: 40px;
    --space-7: 48px;
    --rhythm-1: 8px;
    --rhythm-2: 16px;
    --rhythm-3: 28px;
    --rhythm-4: 32px;
    --text: var(--text-strong);
    --muted: var(--text-muted);
}

/* Mobile: reduce vertical spacing by ~35% for screens under 768px */
@media (max-width: 768px) {
    :root {
        --space-1: 5px;
        --space-2: 10px;
        --space-3: 15px;
        --space-4: 18px;
        --space-5: 20px;
        --space-6: 25px;
        --space-7: 30px;
        --rhythm-1: 5px;
        --rhythm-2: 10px;
        --rhythm-3: 18px;
        --rhythm-4: 20px;
    }
}

body {
    margin: 0;
    background: var(--background);
    color: var(--text);
    font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
    line-height: 1.64;
    letter-spacing: -0.003em;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 1360px;
    margin: 0 auto;
    padding: 0 var(--rhythm-3);
}

.site-header {
    background: #f7fbfa;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--elevation-header);
}

.header-inner {
    min-height: 74px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
}

.header-inner.has-primary {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: var(--space-4);
}

.header-nav-desktop {
    grid-column: 2 / -1;
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: var(--space-4);
    align-items: center;
}

.header-nav-desktop .nav-primary,
.header-nav-desktop .nav-secondary {
    justify-self: center;
}

.header-nav-desktop .header-actions {
    justify-self: end;
}

.header-inner:not(.has-primary) .header-nav-desktop {
    display: flex;
    gap: var(--space-4);
    align-items: center;
    justify-content: flex-end;
    grid-column: unset;
}

.header-hamburger {
    display: none;
    align-items: center;
    justify-content: center;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--muted);
    cursor: pointer;
    font-size: 1.25rem;
    line-height: 1;
}

.header-hamburger:hover {
    color: var(--text);
    background: var(--subtle-tint);
}

@media (min-width: 769px) {
    .header-hamburger {
        display: none;
    }
}

.header-left {
    justify-self: start;
}

.mobile-nav-panel[hidden] {
    display: none;
}

.mobile-nav-panel {
    display: flex;
    flex-direction: column;
    gap: 0;
    padding: var(--space-2);
    border: 1px solid var(--border);
    border-top: 0;
    border-radius: 0 0 var(--radius-md);
    background: var(--surface-elevated);
    box-shadow: var(--elevation-header);
}

.mobile-nav-link {
    display: block;
    padding: 12px 14px;
    text-decoration: none;
    color: var(--muted);
    font-size: 0.93rem;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
}

.mobile-nav-link:hover {
    color: var(--text);
    background: var(--subtle-tint);
}

.mobile-nav-link.is-active {
    color: var(--text);
    background: #eef6f4;
    font-weight: 590;
}

.mobile-nav-form {
    margin: 0;
}

.mobile-nav-form .mobile-nav-link {
    width: 100%;
    text-align: left;
    background: none;
    border: 0;
    cursor: pointer;
}

.brand-logo {
    height: 36px;
    width: auto;
    display: block;
}

.brand {
    text-decoration: none;
    color: var(--text);
    font-weight: 720;
    font-size: 1.05rem;
    letter-spacing: -0.004em;
}

.nav {
    display: flex;
    gap: 4px;
    flex-wrap: wrap;
    align-items: center;
}

.nav-primary {
    justify-self: center;
}

.header-actions {
    justify-self: end;
    display: flex;
    align-items: center;
}

.nav-link {
    text-decoration: none;
    color: var(--muted);
    font-size: 0.93rem;
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    position: relative;
    transition: color var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

.nav-link:hover {
    color: var(--text);
    background: var(--subtle-tint);
    border-color: #deebe8;
    transform: translateY(-1px);
}

.nav-link.is-active {
    color: var(--text);
    background: #eef6f4;
    border-color: #d2e3df;
    font-weight: 590;
}

.nav-link.is-active::after {
    content: "";
    position: absolute;
    left: 12px;
    right: 12px;
    bottom: 1px;
    height: 3px;
    border-radius: var(--radius-pill);
    background: var(--primary);
}

.nav-link-secondary {
    color: var(--muted);
}

.user-menu {
    position: relative;
}

.user-menu-trigger {
    list-style: none;
    cursor: pointer;
    user-select: none;
    color: var(--muted);
    font-size: 0.93rem;
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    transition: color var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast);
}

.user-menu-trigger::-webkit-details-marker {
    display: none;
}

.user-menu-trigger::after {
    content: "▾";
    margin-left: 6px;
    font-size: 0.74rem;
    vertical-align: middle;
}

.user-menu[open] .user-menu-trigger,
.user-menu-trigger:hover {
    color: var(--text);
    background: var(--subtle-tint);
}

.user-menu-panel {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 180px;
    padding: 8px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--surface-elevated);
    box-shadow: var(--elevation-2);
    display: grid;
    gap: 2px;
    z-index: 20;
}

.user-menu-form {
    margin: 0;
}

.user-menu-item {
    width: 100%;
    text-align: left;
    text-decoration: none;
    color: var(--text);
    font: inherit;
    font-size: 0.92rem;
    padding: 8px 10px;
    border-radius: var(--radius-xs);
}

.user-menu-item:hover,
.user-menu-item.is-active {
    background: var(--subtle-tint);
}

.nav-form {
    margin: 0;
}

.link-btn {
    background: none;
    border: none;
    padding: 0;
    margin: 0;
    color: inherit;
    font: inherit;
    font-size: inherit;
    cursor: pointer;
}

.link-btn:hover {
    color: inherit;
}

.main-content {
    flex: 1;
    width: 100%;
    padding-top: var(--space-6);
    padding-bottom: var(--space-6);
}

h1,
h2,
h3 {
    margin: 0 0 var(--rhythm-2) 0;
    font-weight: 640;
    letter-spacing: -0.018em;
    line-height: 1.2;
}

h1 {
    font-size: clamp(2rem, 3.8vw, 2.45rem);
    font-weight: 730;
}

h2 {
    font-size: clamp(1.5rem, 2.6vw, 1.8rem);
}

h3 {
    font-size: 1.08rem;
    letter-spacing: -0.012em;
}

p {
    margin: 0 0 var(--rhythm-2) 0;
}

a {
    color: var(--primary-active);
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    box-shadow: var(--elevation-1);
    padding: var(--space-4);
    margin-bottom: var(--rhythm-3);
    transition: box-shadow var(--transition-std), border-color var(--transition-std), transform var(--transition-std), background-color var(--transition-std);
}

.card > :last-child {
    margin-bottom: 0;
}

.lesson-table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--space-3) 0;
}

.lesson-table th,
.lesson-table td {
    border-bottom: 1px solid var(--border);
    padding: var(--space-1);
    text-align: left;
}

.lesson-table th {
    font-weight: 600;
}

.lesson-tip {
    background: #f4faf9;
    border-left: 4px solid #66b6af;
    padding: 15px;
    margin: 25px 0;
}

.learn-article h2 {
    margin-top: 32px;
}

.learn-article h3 {
    margin-top: 20px;
}

.learn-article p {
    margin-top: 12px;
    line-height: 1.65;
}

.learn-divider {
    border-top: 1px solid #e5e5e5;
    margin: 32px 0;
}

.learn-breadcrumb {
    font-size: 14px;
    margin-bottom: 16px;
    color: #6b7280;
}

.learn-breadcrumb a {
    color: #6b7280;
    text-decoration: none;
}

.learn-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
}

.lesson-card {
    border: 1px solid #e5e5e5;
    border-radius: 8px;
    padding: 20px;
    background: white;
}

.lesson-card__title {
    margin-top: 0;
    margin-bottom: var(--space-1);
    font-size: 1.1rem;
}

.lesson-card__description {
    margin-top: 0;
    margin-bottom: var(--space-2);
    font-size: 0.95rem;
    line-height: 1.5;
}

.lesson-actions {
    display: flex;
    gap: 10px;
    margin-top: 12px;
}

.form-grid {
    display: grid;
    gap: var(--space-2);
}

label {
    display: block;
    font-size: 0.9rem;
    color: #2f413d;
    margin-bottom: var(--space-1);
}

input[type="text"],
input[type="email"],
input[type="password"],
textarea,
select {
    width: 100%;
    min-height: 42px;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font: inherit;
    color: var(--text);
    background: var(--surface);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast);
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: #79c8bb;
    box-shadow: var(--focus-ring);
}

textarea {
    min-height: 96px;
    resize: vertical;
}

[hidden] {
    display: none !important;
}

.actions {
    display: flex;
    gap: var(--space-2);
    flex-wrap: wrap;
}

.btn {
    border: 1px solid var(--primary);
    background: var(--primary);
    color: #ffffff;
    padding: 10px 16px;
    border-radius: var(--radius-sm);
    font: inherit;
    font-size: 0.93rem;
    font-weight: 600;
    letter-spacing: -0.011em;
    line-height: 1.25;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    box-shadow: var(--elevation-btn);
    transition: background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.btn:hover {
    background: var(--primary-hover);
    border-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--elevation-btn-hover);
}

.btn:active {
    background: var(--primary-active);
    border-color: var(--primary-active);
    transform: translateY(0);
    box-shadow: var(--elevation-btn-active);
}

.btn-hero {
    min-width: auto !important;
    padding: 10px 14px;
}

.btn-secondary {
    background: var(--surface-elevated);
    color: #25403c;
    border: 1px solid var(--border-strong);
    box-shadow: var(--elevation-btn-secondary);
}

.btn-secondary:hover {
    background: #f4f8f7;
    border-color: #b7c8c4;
}

.btn-ghost {
    background: transparent;
    color: var(--muted);
    border-color: #d7e3e0;
    box-shadow: none;
}

.btn-ghost:hover {
    background: var(--subtle-tint);
    border-color: #c7d7d3;
    color: var(--text);
}

.btn-danger {
    background: #fffafa;
    color: #98524a;
    border: 1px solid #e2c4bf;
    box-shadow: none;
}

.btn-danger:hover {
    background: #fdf4f2;
    border-color: #d6b1ab;
    transform: none;
    box-shadow: none;
}

.btn-link-danger {
    border: none;
    background: transparent;
    color: #9a5e57;
    padding: 8px 2px;
}

.btn-link-danger:hover {
    color: #924c45;
    background: transparent;
}

.btn:disabled {
    opacity: 0.55;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.mode-accent {
    --mode-accent: var(--primary);
    --mode-accent-hover: var(--primary-hover);
    --mode-accent-active: var(--primary-active);
    --mode-accent-bg: rgba(11, 155, 136, 0.12);
    --mode-accent-border: rgba(11, 155, 136, 0.35);
    --mode-accent-text: #1e5f56;
}

.mode-accent-flashcards {
    --mode-accent: #1f8f5f;
    --mode-accent-hover: #1a7b52;
    --mode-accent-active: #156845;
    --mode-accent-bg: rgba(31, 143, 95, 0.12);
    --mode-accent-border: rgba(31, 143, 95, 0.35);
    --mode-accent-text: #1b6244;
}

.mode-accent-quiz {
    --mode-accent: #2f6feb;
    --mode-accent-hover: #295fc7;
    --mode-accent-active: #234fa6;
    --mode-accent-bg: rgba(47, 111, 235, 0.12);
    --mode-accent-border: rgba(47, 111, 235, 0.35);
    --mode-accent-text: #204d9e;
}

.mode-accent-match {
    --mode-accent: #7a4ec2;
    --mode-accent-hover: #6943a5;
    --mode-accent-active: #573885;
    --mode-accent-bg: rgba(122, 78, 194, 0.12);
    --mode-accent-border: rgba(122, 78, 194, 0.35);
    --mode-accent-text: #573885;
}

.mode-accent-write {
    --mode-accent: #d97a20;
    --mode-accent-hover: #bc6a1b;
    --mode-accent-active: #9e5916;
    --mode-accent-bg: rgba(217, 122, 32, 0.12);
    --mode-accent-border: rgba(217, 122, 32, 0.35);
    --mode-accent-text: #8a4e16;
}

.mode-accent .nav-link.is-active::after {
    background: var(--mode-accent);
}

.mode-accent .btn:not(.btn-secondary):not(.btn-ghost):not(.btn-danger):not(.btn-link-danger) {
    background: var(--mode-accent);
    border-color: var(--mode-accent);
}

.mode-accent .btn:not(.btn-secondary):not(.btn-ghost):not(.btn-danger):not(.btn-link-danger):hover {
    background: var(--mode-accent-hover);
    border-color: var(--mode-accent-hover);
}

.mode-accent .btn:not(.btn-secondary):not(.btn-ghost):not(.btn-danger):not(.btn-link-danger):active {
    background: var(--mode-accent-active);
    border-color: var(--mode-accent-active);
}

.error {
    color: var(--danger);
    margin-bottom: var(--space-1);
}

.success {
    color: var(--success);
    margin-bottom: var(--space-1);
}

.system-message {
    margin: 0 0 var(--space-2);
    padding: var(--space-2);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background: var(--surface-elevated);
    font-size: 0.9rem;
}

.system-message p {
    margin: 0;
}

.system-message-error {
    border-color: #dfb8b3;
    color: var(--danger);
    background: #fff8f7;
}

.system-message-success {
    border-color: #b9d9d2;
    color: var(--success);
    background: #f4faf8;
}

.system-message-info {
    border-color: var(--border);
    color: var(--muted);
    background: var(--surface-elevated);
}

label.required-field::after {
    content: " *";
    color: var(--danger);
}

.input-invalid,
textarea.input-invalid,
select.input-invalid {
    border-color: #d39f98;
}

.input-invalid:focus,
textarea.input-invalid:focus,
select.input-invalid:focus {
    border-color: #c98d84;
}

.btn.is-loading,
.btn.is-loading:hover,
.btn.is-loading:active {
    opacity: 0.7;
    cursor: progress;
    transform: none;
    box-shadow: none;
}

.list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: var(--space-2);
}

.list-item {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: var(--space-3);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}

.muted {
    color: var(--muted);
    font-size: 0.91rem;
}

.site-footer {
    margin-top: auto;
    border-top: 1px solid var(--border);
    background: var(--surface-elevated);
}

.footer-inner {
    min-height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    color: var(--muted);
    font-size: 0.86rem;
}

.footer-tagline {
    margin: 0;
}

.footer-links {
    display: flex;
    align-items: center;
    gap: 12px;
}

.footer-link {
    color: var(--muted);
    text-decoration: none;
}

.footer-link:hover {
    color: var(--text);
    text-decoration: underline;
}

.stack-sm > * + * {
    margin-top: var(--space-2);
}

.stack-md > * + * {
    margin-top: var(--space-3);
}

.mt-xs {
    margin-top: var(--space-1);
}

.mt-sm {
    margin-top: var(--space-2);
}

.mt-md {
    margin-top: var(--space-3);
}

.max-w-sm {
    max-width: 320px;
}

.max-w-md {
    max-width: 420px;
}

.section-heading {
    margin-bottom: var(--rhythm-3);
}

.section-heading h2,
.section-heading h3 {
    margin-bottom: var(--space-1);
}

.dashboard-shell {
    display: grid;
    gap: var(--space-4);
}

.continue-card {
    border-color: #c7dfda;
    background: var(--surface-elevated);
    box-shadow: var(--elevation-2);
}

.dashboard-trust-note {
    margin: 0;
    font-size: 0.84rem;
}

.curated-dashboard-panel {
    border-color: #cde0dc;
    background: var(--surface-elevated);
}

.weekly-summary-panel {
    border-color: #d5dfdc;
    background: var(--surface);
    box-shadow: var(--elevation-1);
    padding: var(--space-3);
}

.weekly-summary-panel h3 {
    margin-bottom: var(--space-2);
}

.weekly-stats-grid {
    display: grid;
    gap: var(--space-1);
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.weekly-stat-item {
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--surface);
    padding: var(--space-1) var(--space-2);
    display: grid;
    gap: 2px;
    box-shadow: var(--elevation-micro);
}

.weekly-label {
    font-size: 0.76rem;
    color: var(--muted);
}

.weekly-stat-item strong {
    font-size: 1.06rem;
}

.weekly-note {
    margin-top: var(--space-1);
    margin-bottom: 0;
}

.curated-dashboard-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--space-3);
}

.dashboard-packs-grid {
    gap: var(--space-2);
}

.dashboard-pack-card.is-featured {
    border-color: #c0ddd7;
    background: var(--subtle-tint);
    box-shadow: var(--elevation-3);
}

.dashboard-pack-action {
    margin: 0;
}

.sets-panel {
    margin-bottom: 0;
}

.library-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--space-3);
}

.library-toolbar {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--space-1);
    flex-wrap: wrap;
}

.library-mode-tabs {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: 12px;
}

.library-sort,
.library-search {
    width: auto;
    min-height: 34px;
    padding: 7px 10px;
    font-size: 0.9rem;
}

.library-search {
    min-width: 220px;
}

.library-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.library-card {
    position: relative;
}

.library-card-count {
    margin: 0;
    padding: var(--space-1) 0;
    font-size: 0.93rem;
    font-weight: 600;
    color: var(--text-muted);
}

.library-progress-indicator {
    display: grid;
    gap: var(--space-1);
    padding: var(--space-1) 0;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.library-progress-text {
    margin: 0;
    font-size: 0.84rem;
    font-weight: 600;
    color: var(--text-muted);
}

.library-progress-bar {
    height: 6px;
    background: var(--surface-elevated);
    border-radius: 3px;
    overflow: hidden;
}

.library-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--primary-active));
    border-radius: 3px;
    transition: width 0.3s ease;
}

/* Library card vertical layout */
.library-card {
    position: relative;
}

.library-card-overflow-menu {
    position: absolute;
    top: var(--space-3);
    right: var(--space-3);
    z-index: 10;
}

.library-card-primary-action {
    display: flex;
    justify-content: center;
    margin-top: var(--space-2);
}

.library-card-primary-action .btn {
    width: 100%;
    max-width: 200px;
}

@media (max-width: 600px) {
    .library-card-primary-action .btn {
        max-width: none;
    }
}

.library-card-actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-1);
}

.library-card-actions > .btn {
    flex: 1;
    margin: 0;
}

.library-card-menu {
    position: relative;
    display: flex;
    align-items: center;
}

.library-menu-trigger {
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--surface);
    color: var(--text-muted);
    font-size: 1rem;
    line-height: 1;
    cursor: pointer;
    transition: background var(--transition-fast), color var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 44px;
    min-height: 44px;
    box-sizing: border-box;
}

.library-menu-trigger:hover {
    background: var(--surface-elevated);
    color: var(--text-strong);
}

.library-menu-trigger[aria-expanded="true"] {
    background: var(--surface-elevated);
    color: var(--primary);
}

.library-menu-panel {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 2px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--surface);
    box-shadow: var(--elevation-2);
    min-width: 140px;
    z-index: 30;
}

.library-menu-panel[hidden] {
    display: none;
}

.library-menu-item {
    display: flex;
    align-items: center;
    width: 100%;
    padding: 8px 12px;
    border: none;
    background: transparent;
    color: var(--text-strong);
    font-size: 0.93rem;
    text-decoration: none;
    cursor: pointer;
    text-align: left;
    transition: background var(--transition-fast), color var(--transition-fast);
}

.library-menu-item:hover {
    background: var(--surface-elevated);
}

.library-menu-item.library-menu-danger {
    color: var(--danger);
}

.library-menu-item.library-menu-danger:hover {
    background: rgba(255, 0, 0, 0.05);
}

.library-menu-form {
    margin: 0;
}

.library-toolbar .btn {
    box-shadow: none;
    background: transparent;
    color: var(--muted);
    border-color: #ccdcd8;
}

.library-toolbar .btn:hover,
.library-toolbar .btn:active {
    transform: none;
    box-shadow: none;
    color: var(--text);
    background: #f0f7f5;
    border-color: #c0d4d0;
}

.btn-sm {
    padding: var(--space-1) var(--space-2);
    font-size: 0.84rem;
}

.secondary-panel {
    padding: var(--space-3);
}

.snapshot-panel-structured {
    border-color: #cadad6;
    background: var(--surface-elevated);
}

.snapshot-head {
    margin-bottom: var(--space-2);
}

.snapshot-head p {
    margin: 0;
}

/* Dashboard mode tabs: horizontal scrollable chips on mobile only */
@media (max-width: 768px) {
    .dashboard-shell .library-mode-tabs {
        display: flex;
        flex-wrap: nowrap;
        gap: 6px;
        margin-top: 10px;
        margin-bottom: 0;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        padding-bottom: 4px;
        scrollbar-width: thin;
    }

    .dashboard-shell .library-mode-tabs .btn {
        flex-shrink: 0;
        white-space: nowrap;
        padding: 6px 12px;
        font-size: 0.8125rem;
    }
}

.snapshot-stats-grid-structured {
    gap: var(--space-1);
}

.snapshot-panel {
    max-width: 100%;
    border-color: #d5e0dd;
    background: var(--surface-elevated);
}

.snapshot-panel h3 {
    margin-bottom: var(--space-3);
}

.snapshot-stats-grid {
    display: grid;
    gap: var(--space-1);
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
}

.snapshot-stat-card {
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: var(--space-1) 10px;
    background: #ffffff;
    display: grid;
    gap: 1px;
    box-shadow: var(--elevation-micro);
}

.snapshot-label {
    font-size: 0.72rem;
    color: var(--muted);
}

.snapshot-stat-card strong {
    font-size: 1.24rem;
    line-height: 1.15;
}

.snapshot-panel h3 {
    font-size: 1rem;
}

.snapshot-panel p {
    margin-bottom: 10px;
}

.snapshot-visual-placeholders {
    margin-top: var(--space-2);
    display: grid;
    gap: var(--space-1);
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.snapshot-placeholder {
    border: 1px dashed var(--border);
    border-radius: var(--radius-sm);
    min-height: 52px;
    padding: var(--space-1) var(--space-2);
    color: var(--muted);
    font-size: 0.8rem;
    display: flex;
    align-items: center;
}

.snapshot-placeholder span {
    display: block;
}

.snapshot-zero-state {
    margin-top: var(--space-2);
    border-top: 1px solid var(--border);
    padding-top: var(--space-2);
    display: grid;
    gap: var(--space-1);
}

.snapshot-zero-state p {
    margin: 0;
}

.curated-panel {
    max-width: 620px;
    border-color: #d5e0dd;
    background: var(--surface-elevated);
}

.curated-library-head {
    margin-bottom: var(--space-4);
}

.curated-library-list {
    gap: var(--space-2);
}

.curated-pack-card.is-featured {
    border-color: #c4ddd8;
    background: var(--subtle-tint);
    box-shadow: var(--elevation-3);
}

.curated-pack-badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    border-radius: var(--radius-pill);
    border: 1px solid #c8ddd8;
    color: #3a5953;
    font-size: 0.78rem;
    line-height: 1.2;
    background: var(--subtle-tint);
}

.curated-pack-actions {
    display: flex;
    gap: var(--space-2);
    flex-wrap: wrap;
}

.curated-pack-action {
    margin: 0;
}

.pack-module-grid {
    display: grid;
    gap: var(--space-2);
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.pack-module-card {
    --pack-accent: #c5d8d3;
    margin-bottom: 0;
    border: 1px solid var(--border);
    border-top: 3px solid var(--pack-accent);
    border-radius: var(--radius-md);
    background: var(--surface);
    padding: var(--space-3);
    box-shadow: var(--elevation-1);
    display: grid;
    gap: var(--space-2);
    align-content: start;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}

.pack-module-card:hover {
    transform: translateY(-1px);
    box-shadow: var(--elevation-2);
    border-color: #c4d8d3;
}

.pack-module-title {
    margin: 0;
    font-size: 1.14rem;
    font-weight: 700;
    line-height: 1.25;
}

.pack-module-title a {
    text-decoration: none;
    color: var(--text-strong);
}

.pack-module-title a:hover {
    color: var(--primary-active);
}

.pack-module-description {
    margin: 0;
    color: var(--text-muted);
    font-size: 0.93rem;
    line-height: 1.56;
}

.pack-module-badge {
    margin: 0;
    width: fit-content;
    border: 1px solid var(--border);
    border-radius: var(--radius-pill);
    padding: 2px 10px;
    font-size: 0.76rem;
    font-weight: 620;
    letter-spacing: 0.02em;
    text-transform: uppercase;
    color: var(--text-muted);
    background: var(--surface);
}

.pack-module-meta {
    margin: 0;
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-1);
    color: var(--text-muted);
    font-size: 0.84rem;
}

.pack-module-meta span {
    white-space: nowrap;
}

.library-meta-secondary {
    font-size: 0.82rem;
    color: var(--muted);
}

.danger-inline-note {
    margin: 0;
    font-size: 0.8rem;
    color: var(--muted);
}

.pack-module-footer {
    margin-top: auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-2);
}

.library-card .pack-module-footer {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-2);
}

.library-card .pack-module-count {
    text-align: center;
    order: 2;
}

.pack-module-count {
    margin: 0;
    color: var(--text-strong);
    font-size: 0.84rem;
    font-weight: 620;
}

.pack-module-actions {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    flex-wrap: wrap;
    gap: var(--space-1);
}

.pack-module-actions form {
    margin: 0;
}

.pack-module-select {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    color: var(--text-muted);
    font-size: 0.86rem;
    font-weight: 600;
}

.pack-module-select input[type="checkbox"] {
    margin: 0;
}

.study-layout {
    max-width: 760px;
    margin: 0 auto;
    display: grid;
    gap: var(--space-4);
}

body.study-mode-page {
    background: #eef4f2;
}

.site-header.is-minimal {
    background: #f4faf8;
}

.site-header.is-minimal .header-inner {
    min-height: 56px;
}

body.study-mode-page .site-footer {
    display: none;
}

body.study-mode-page .main-content {
    padding-top: var(--space-4);
    padding-bottom: var(--space-5);
}

.study-focus-layout {
    max-width: 940px;
    min-height: calc(100vh - 132px);
    align-content: center;
}

.study-topbar {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--space-3);
    padding: var(--space-2);
    border-bottom: 1px solid var(--border);
    background: var(--subtle-tint);
    box-shadow: none;
}

.study-topbar p {
    margin-bottom: 0;
}

.study-context-line,
.study-progress-line {
    font-size: 0.84rem;
}

.mode-accent .study-card-topbar {
    border-bottom-color: var(--mode-accent);
    border-bottom-width: 2px;
}

.study-mode-badge,
.mode-accent .set-mode-chip {
    display: inline-block;
    margin-top: 4px;
    padding: 2px 10px;
    border: 1px solid var(--mode-accent-border);
    border-radius: var(--radius-pill);
    background: var(--mode-accent-bg);
    color: var(--mode-accent-text);
    font-size: 0.78rem;
    line-height: 1.3;
}

.study-feedback {
    margin: 0 0 var(--space-2);
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    font-size: 0.84rem;
}

.study-feedback-known {
    color: var(--success);
    background: #f5faf8;
    border-color: #b9d9d2;
}

.study-feedback-again {
    color: #8f463f;
    background: #fff8f7;
    border-color: #dfb8b3;
}

.study-top-actions {
    gap: 6px;
    justify-content: flex-end;
    display: flex;
    flex-wrap: wrap;
}

.study-top-actions .btn {
    padding: 7px 10px;
    font-size: 0.86rem;
}

.study-toolbar .actions {
    gap: 8px;
}

.study-card {
    max-width: 780px;
    width: min(100%, 780px);
    margin: 0 auto;
    padding: var(--space-5);
    border-color: #c7d8d4;
    background: var(--surface-elevated);
    box-shadow: var(--elevation-2);
}

.study-card-topbar {
    margin: 0 0 var(--space-3) 0;
    padding: var(--space-2);
    border-radius: 0;
    border-width: 0 0 1px 0;
    border-bottom-color: var(--border);
    box-shadow: none;
    background: var(--subtle-tint);
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--space-3);
    height: auto;
    min-height: auto;
    white-space: normal;
}

.study-card-topbar > div {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.study-card-topbar > div:last-child {
    align-items: flex-end;
}

.study-item {
    display: none;
}

.study-item.is-active {
    display: block;
}

.study-flip-scene {
    perspective: 1200px;
}

.study-flip-inner {
    position: relative;
    width: 100%;
    min-height: 240px;
    transform-style: preserve-3d;
    transition: transform var(--transition-std);
}

.study-item.is-flipped .study-flip-inner {
    transform: rotateY(180deg);
}

.study-face {
    position: absolute;
    inset: 0;
    border: 1px solid #ceddd9;
    border-radius: var(--radius-lg);
    background: #ffffff;
    padding: 30px;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    display: flex;
    flex-direction: column;
    justify-content: center;
    box-shadow: var(--elevation-2);
    transition: transform var(--transition-std), box-shadow var(--transition-std), border-color var(--transition-std);
}

.study-face-front {
    align-items: center;
    text-align: center;
}

.study-face-back {
    transform: rotateY(180deg);
    justify-content: space-between;
}

.study-item.is-active .study-face {
    border-color: #c5d8d3;
}

@media (prefers-reduced-motion: reduce) {
    .study-flip-inner {
        transition: none;
    }
}

.study-face-label {
    margin: 0 0 var(--space-3);
    font-size: 0.82rem;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.study-prompt,
.study-answer {
    margin: 0;
}

.study-prompt {
    font-size: 22px;
    line-height: 1.5;
    font-weight: 650;
}

.study-answer {
    font-size: 1.05rem;
    line-height: 1.65;
    color: #314542;
}

.study-assessment {
    margin-top: var(--space-4);
    justify-content: center;
}

.study-assessment form {
    margin: 0;
}

.study-card-controls {
    margin-top: var(--space-5);
    justify-content: center;
}

.study-nav {
    margin-top: var(--space-5);
    justify-content: center;
}

.study-nav .btn {
    min-width: 120px;
}

.study-prev-btn {
    opacity: 0.78;
}

.study-nav .btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

.flip-btn {
    min-width: 168px;
}

.study-incorrect-btn {
    color: #8f463f;
    border-color: #ddb9b4;
    background: #fff9f8;
}

.study-incorrect-btn:hover {
    background: #fdf2f0;
    border-color: #d2a49e;
}

.study-error {
    margin-bottom: 0;
}

.session-complete-card {
    max-width: 620px;
    margin: 0 auto;
    padding: var(--space-4);
    border-color: #c8dbd6;
    background: var(--surface-elevated);
    box-shadow: var(--elevation-1);
}

.session-complete-placeholder {
    margin-top: var(--space-1);
    border: 1px dashed var(--border);
    border-radius: var(--radius-sm);
    min-height: 42px;
    padding: var(--space-1) var(--space-2);
    color: var(--muted);
    font-size: 0.8rem;
    display: flex;
    align-items: center;
}

.study-score-prominent {
    margin: 0;
    font-size: clamp(2rem, 4vw, 2.6rem);
    font-weight: 720;
    line-height: 1.05;
}

.session-summary-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-1);
    margin-top: var(--space-2);
}

.session-summary-item {
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: var(--space-1) var(--space-2);
    background: var(--surface);
    display: grid;
    gap: 2px;
}

.session-summary-item strong {
    font-size: 1.02rem;
}

.session-complete-actions {
    margin-top: var(--space-3);
    justify-content: center;
}

.session-complete-reinforcement,
.session-complete-nudge {
    margin: 0;
}

.set-shell {
    display: grid;
    gap: var(--space-4);
}

.set-page-shell {
    gap: var(--space-5);
}

.set-primary .actions {
    gap: var(--space-1);
}

.management-panel {
    border-style: solid;
}

.set-hero {
    padding: var(--space-5);
    border-color: #c3ddd7;
    background: var(--subtle-tint);
    box-shadow: var(--elevation-3);
}

.set-hero-title {
    margin-bottom: var(--space-1);
    font-size: clamp(1.7rem, 3vw, 2.2rem);
}

.mode-accent .set-hero-title {
    display: inline-block;
    box-shadow: inset 0 -3px 0 var(--mode-accent);
}

.set-hero-subject {
    margin-bottom: var(--space-3);
    font-size: 1rem;
}

.set-hero-cta-row {
    margin-top: 0;
}

.set-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    max-width: fit-content;
}

.set-actions .btn,
.set-actions button {
    width: auto;
    max-width: fit-content;
}

.set-actions .btn:nth-child(n+3) {
    margin-top: 8px;
}

.set-primary-cta {
    padding: 12px 20px;
    font-size: 1rem;
    font-weight: 700;
    box-shadow: var(--elevation-3);
}

.set-secondary-btn {
    padding: 8px 14px;
    font-size: 0.9rem;
    font-weight: 600;
}

.set-secondary-study-options {
    margin-top: var(--space-3);
}

.set-secondary-study-options .muted {
    margin-bottom: 8px;
    font-size: 0.85rem;
}

.set-secondary-study-links {
    gap: var(--space-1);
}

.set-secondary-study-group {
    gap: 0;
}

.set-study-option {
    border-radius: 0;
    border-right-width: 0;
}

.set-study-option:first-child {
    border-top-left-radius: var(--radius-sm);
    border-bottom-left-radius: var(--radius-sm);
}

.set-study-option:last-child {
    border-right-width: 1px;
    border-top-right-radius: var(--radius-sm);
    border-bottom-right-radius: var(--radius-sm);
}

.set-secondary-study-links .btn {
    box-shadow: none;
    transform: none;
}

.set-ready-line {
    margin-top: var(--space-3);
    margin-bottom: 0;
}

.set-hero-top-actions {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    gap: 8px;
    margin-bottom: 12px;
    flex-wrap: wrap;
    max-width: fit-content;
    margin-left: auto;
}

.set-hero-top-actions .btn {
    padding: 8px 12px;
    font-size: 0.85rem;
    width: auto;
    max-width: fit-content;
}

.set-delete-form {
    margin: 0;
}

.set-delete-btn {
    border-color: #d9534f;
    color: #b03a36;
}

.set-progress-bar {
    margin: 16px 0 20px;
    padding: 12px 0;
    border-top: 1px solid #eee;
    border-bottom: 1px solid #eee;
}

.progress-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.875rem;
    margin-bottom: 8px;
}

.progress-label span:first-child {
    font-weight: 600;
}

.progress-hint {
    color: #666;
    font-size: 0.8rem;
}

.progress-track {
    width: 100%;
    height: 4px;
    background-color: #eee;
    border-radius: 999px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background-color: #0066cc;
    transition: width 0.3s ease;
}

button[disabled].set-primary-cta {
    opacity: 0.6;
    cursor: not-allowed;
}

.set-cards-panel {
    padding-top: var(--space-4);
    background: var(--surface-elevated);
}

.set-cards-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
}

.set-empty-state {
    border: 1px dashed var(--border-strong);
    border-radius: var(--radius-md);
    padding: var(--space-5);
    background: var(--surface-elevated);
}

.set-empty-state h4 {
    margin: 0 0 8px;
    font-size: 1.2rem;
}

.set-empty-state p {
    margin: 0;
}

.set-card-grid {
    list-style: none;
    margin: var(--space-3) 0 0;
    padding: 0;
    display: grid;
    gap: var(--space-2);
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.set-card-module {
    margin: 0;
    border: 1px solid var(--border);
    border-top: 3px solid var(--border-strong);
    border-radius: var(--radius-md);
    background: var(--surface);
    padding: var(--space-3);
    box-shadow: var(--elevation-1);
    display: grid;
    gap: var(--space-2);
    align-content: start;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}

.set-card-module:hover {
    border-color: var(--border-strong);
    transform: translateY(-1px);
    box-shadow: var(--elevation-2);
}

.set-card-text {
    padding: 0;
    background: transparent;
    display: grid;
    gap: 6px;
}

.set-card-back-wrap {
    border-top: 1px solid var(--border);
    padding-top: var(--space-2);
    background: #fbfdfc;
}

.set-card-face-label {
    margin: 0;
    font-size: 0.72rem;
    font-weight: 620;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    color: var(--text-muted);
}

.set-card-front,
.set-card-back {
    margin: 0;
    line-height: 1.55;
    color: var(--text);
}

.set-card-front {
    font-size: 1rem;
    font-weight: 600;
}

.set-card-back {
    font-size: 0.95rem;
    color: var(--text-muted);
}

.set-card-actions {
    margin-top: 2px;
    justify-content: flex-end;
    gap: var(--space-1);
}

.set-card-delete-form {
    margin: 0;
}

.set-card-manage-link {
    border: none;
    background: transparent;
    color: var(--muted);
    font: inherit;
    font-size: 0.82rem;
    line-height: 1.2;
    padding: 0;
    text-decoration: none;
    cursor: pointer;
    transition: color var(--transition-fast);
}

.set-card-manage-link:hover {
    color: var(--text);
    text-decoration: underline;
}

.set-card-manage-danger {
    color: #996761;
}

.set-settings-panel {
    background: var(--surface-elevated);
    border-color: #d6e1de;
    padding: var(--space-4);
}

.management-subtle {
    display: grid;
    gap: var(--space-3);
}

.card-copy {
    margin: 0;
}

.card-answer {
    margin: 6px 0 0;
}

.status-block {
    margin-top: var(--space-2);
}

.auth-page {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.auth-page .main-content {
    flex: 1;
    display: flex;
    align-items: center;
}

.auth-layout {
    max-width: 1220px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4);
    align-items: stretch; 
}

.auth-visual {
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: clamp(28px, 4vw, 44px);
    background: linear-gradient(150deg, var(--subtle-tint) 0%, var(--surface) 65%);
    box-shadow: var(--elevation-1);

    display: flex;
    flex-direction: column;
    justify-content: center;  /* Center block vertically */
}

.auth-visual-kicker {
    margin: 0;
    font-size: 0.76rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-muted);
    font-weight: 620;
}

.auth-visual h2 {
    margin: 0;
    font-size: clamp(1.8rem, 3.2vw, 2.4rem);
    line-height: 1.1;
}

.auth-visual p {
    margin: 0;
    max-width: 460px;
    color: var(--text-muted);
    font-size: 1rem;
    line-height: 1.62;
}

.auth-visual-image {
    width: 100%;
    max-width: 440px;
    height: auto;
    align-self: center;
    margin-top: 3rem;

    filter: drop-shadow(0 8px 16px rgba(0, 0, 0, 0.05));
}

.auth-form-wrap {
    display: grid;
    align-items: center;
}

.auth-form-card {
    margin: 0;
    padding: clamp(28px, 4vw, 42px);
    border-color: #c8d8d4;
    box-shadow: var(--elevation-3);
}

.auth-brand-mark {
    margin: 0 0 var(--space-1);
    font-size: 0.84rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--text-muted);
}

.auth-form-card h1 {
    margin-bottom: var(--space-1);
    font-size: clamp(1.75rem, 2.8vw, 2.15rem);
}

.auth-form-subtext {
    margin-bottom: var(--space-3);
    color: var(--text-muted);
    font-size: 0.96rem;
}

.auth-form-grid {
    gap: var(--space-2);
}

.auth-form-card input[type="email"],
.auth-form-card input[type="password"] {
    min-height: 46px;
    padding: 11px 12px;
}

.auth-form-card input[type="email"]:focus,
.auth-form-card input[type="password"]:focus {
    border-color: var(--primary);
    box-shadow: var(--focus-ring-strong);
}

.auth-actions {
    margin-top: var(--space-1);
}

.auth-actions .btn {
    min-width: 144px;
}

.home-page .site-header {
    border-bottom-color: #d9e2df;
}

.home-page .main-content {
    padding-top: 0;
    padding-bottom: 0;
}

.home-main {
    padding-top: var(--space-7);
    padding-bottom: var(--space-7);
    display: grid;
    gap: var(--space-7);
}

.home-message {
    max-width: 760px;
    margin-bottom: var(--space-3);
}

.home-hero {
    max-width: 1120px;
    text-align: left;
    position: relative;
    overflow: hidden;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-7);
    background: linear-gradient(160deg, var(--subtle-tint) 0%, var(--surface) 52%);
    box-shadow: var(--elevation-1);
}

.home-hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background: repeating-linear-gradient(135deg, transparent 0 26px, var(--surface-elevated) 26px 27px);
    opacity: 0.62;
    pointer-events: none;
}

.home-hero > * {
    position: relative;
    z-index: 1;
}

.home-hero h1 {
    font-size: clamp(2.3rem, 5vw, 3.4rem);
    margin-bottom: var(--rhythm-2);
    line-height: 1.08;
    letter-spacing: -0.03em;
}

.home-subtext {
    max-width: 760px;
    margin: 0;
    color: var(--text-muted);
    font-size: 1.14rem;
    line-height: 1.66;
}

.home-actions {
    justify-content: flex-start;
    margin-top: var(--space-4);
}

.home-actions .btn {
    min-width: 138px;
}

.home-section {
    max-width: 1120px;
    display: grid;
    gap: var(--space-3);
}

.home-section h2 {
    margin-bottom: var(--space-1);
    font-size: clamp(1.6rem, 2.4vw, 2rem);
}

.home-section-intro {
    max-width: 760px;
    margin: 0;
    color: var(--text-muted);
    font-size: 1rem;
    line-height: 1.62;
}

.home-featured-packs {
    max-width: 1120px;
}

.home-featured-packs h2 {
    margin-bottom: var(--space-2);
}

.home-featured-empty-actions {
    margin-top: var(--space-3);
}

.home-pack-grid {
    gap: var(--space-2);
}

.home-pack-item--math,
.home-pack-item--mathematics {
    --pack-accent: var(--primary-active);
}

.home-pack-item--geography {
    --pack-accent: var(--success);
}

.home-pack-item--science {
    --pack-accent: var(--primary-hover);
}

.home-pack-item--history,
.home-pack-item--language,
.home-pack-item--languages {
    --pack-accent: var(--text-muted);
}

.home-pack-item--coding,
.home-pack-item--programming {
    --pack-accent: var(--danger);
}

.home-steps-grid {
    display: grid;
    gap: var(--rhythm-2);
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.home-step-card {
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--surface);
    padding: var(--space-3);
    box-shadow: var(--elevation-1);
}

.home-step-number {
    display: inline-flex;
    width: 24px;
    height: 24px;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-pill);
    border: 1px solid var(--border-strong);
    color: var(--text-muted);
    font-size: 0.82rem;
    margin-bottom: 8px;
    background: var(--subtle-tint);
}

.home-step-card h3 {
    margin-bottom: 6px;
}

.home-step-card p {
    margin-bottom: 0;
}

.home-footer-privacy {
    max-width: 1120px;
    margin-top: var(--space-2);
    border-top: 1px solid var(--border);
    padding-top: var(--space-3);
    display: grid;
}

.home-footer-privacy p {
    margin: 0;
    color: var(--text-muted);
    font-size: 0.93rem;
}

/* Section background alternation */
.home-section-bg {
    padding-top: var(--space-6);
    padding-bottom: var(--space-6);
}

.home-section-bg--alt {
    background: var(--surface-elevated);
}

/* Hero mode preview grid */
.home-hero-layout {
    display: grid;
    gap: var(--space-5);
    grid-template-columns: 1fr;
}

.home-hero-image {
    min-width: 0;
    overflow: hidden;
}

.home-hero-image img {
    width: 100%;
    max-width: 100%;
    height: auto;
    object-fit: cover;
}

.home-mode-preview-grid {
    display: grid;
    gap: var(--space-2);
    grid-template-columns: repeat(2, 1fr);
}

.home-mode-preview-card {
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--surface);
    box-shadow: var(--elevation-2);
    overflow: hidden;
    /* display: grid; */
    font-size: 0.82rem;
}

.home-mode-preview-card--flashcard {
    border-top: 3px solid #1f8f5f;
}

.home-mode-preview-card--quiz {
    border-top: 3px solid #2f6feb;
}

.home-mode-preview-card--match {
    border-top: 3px solid #7a4ec2;
}

.home-mode-preview-card--write {
    border-top: 3px solid #d97a20;
}

.home-mode-preview-header {
    font-size: 0.68rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    font-weight: 600;
    height: 35px;
    min-height: 35px;
    padding: 0 12px;
    display: flex;
    align-items: center;
    line-height: 1;
    white-space: nowrap;
    background: var(--subtle-tint);
    border-bottom: 1px solid var(--border);
}

.home-mode-preview-body {
    padding: 12px;
    display: grid;
    gap: 8px;
    align-content: start;
}

.home-mode-preview-face {
    font-weight: 600;
    color: var(--text-strong);
    font-size: 0.82rem;
    line-height: 1.4;
    align-self: start;
}

.home-mode-preview-divider {
    height: 1px;
    background: var(--border);
    margin: 4px 0;
}

.home-mode-preview-answer {
    color: var(--text-muted);
    font-size: 0.78rem;
    line-height: 1.4;
}

.home-mode-preview-question-text {
    font-weight: 600;
    color: var(--text-strong);
    font-size: 0.82rem;
    line-height: 1.4;
    margin-bottom: 4px;
}

.home-mode-preview-choice {
    background: var(--surface-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 6px 8px;
    font-size: 0.76rem;
    color: var(--text-muted);
}

.home-mode-preview-choice--selected {
    background: rgba(47, 111, 235, 0.12);
    border-color: rgba(47, 111, 235, 0.35);
    color: #204d9e;
    font-weight: 600;
}

.home-mode-preview-match-row {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 8px;
    align-items: center;
}

.home-mode-preview-match-left,
.home-mode-preview-match-right {
    background: var(--surface-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 6px 8px;
    font-size: 0.76rem;
    color: var(--text-muted);
    text-align: center;
}

.home-mode-preview-match-connector {
    width: 16px;
    height: 2px;
    background: var(--border-strong);
    position: relative;
}

.home-mode-preview-match-connector::after {
    content: '';
    position: absolute;
    right: -3px;
    top: -2px;
    width: 0;
    height: 0;
    border-left: 4px solid var(--border-strong);
    border-top: 3px solid transparent;
    border-bottom: 3px solid transparent;
}

.home-mode-preview-prompt-text {
    font-weight: 600;
    color: var(--text-strong);
    font-size: 0.82rem;
    line-height: 1.4;
    margin-bottom: 4px;
}

.home-mode-preview-input-field {
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    padding: 6px 8px;
    font-size: 0.78rem;
    color: var(--text-strong);
    background: var(--surface);
}

/* Mode cards section */
.home-modes-section {
    max-width: 1120px;
}

.home-modes-grid {
    display: grid;
    gap: var(--space-3);
    grid-template-columns: repeat(2, 1fr);
}

.home-mode-card {
    text-decoration: none;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    background: var(--surface);
    padding: var(--space-4);
    box-shadow: var(--elevation-1);
    display: grid;
    gap: var(--space-2);
    align-content: start;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}

.home-mode-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--elevation-3);
    border-color: var(--border-strong);
}

.home-mode-card-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background: var(--mode-accent-bg);
    border: 2px solid var(--mode-accent-border);
    display: flex;
    align-items: center;
    justify-content: center;
}

.home-mode-card-icon img {
    width: 28px;
    height: 28px;
}

.home-mode-card h3 {
    margin: 0;
    font-size: 1.3rem;
    color: var(--text-strong);
}

.home-mode-card p {
    margin: 0;
    color: var(--text-muted);
    line-height: 1.56;
}

.home-mode-card-link {
    color: var(--mode-accent);
    font-weight: 600;
    font-size: 0.93rem;
}

/* Credibility section */
.home-credibility-section {
    max-width: 1120px;
}

.home-dashboard-mock {
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    background: var(--surface);
    padding: var(--space-4);
    box-shadow: var(--elevation-2);
    display: grid;
    gap: var(--space-3);
}

.home-dashboard-mock-metrics {
    display: grid;
    gap: var(--space-2);
    grid-template-columns: repeat(3, 1fr);
}

.home-dashboard-mock-metric {
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--subtle-tint);
    padding: var(--space-2);
    text-align: center;
}

.home-dashboard-mock-metric-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 4px;
}

.home-dashboard-mock-metric-value {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-strong);
}

.home-dashboard-mock-chart {
    margin-top: 2rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    background: var(--surface-elevated);
    padding: 1.5rem;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 260px; /* controls visual height */
    overflow: hidden;
}

.home-dashboard-mock-chart img {
    width: 100%;
    max-width: 480px; /* limits width */
    height: auto;
    opacity: 0.9;
}

/* Example packs grid */
.home-example-packs-grid {
    display: grid;
    gap: var(--space-3);
    grid-template-columns: repeat(3, 1fr);
}

.home-example-pack {
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    background: var(--surface);
    padding: var(--space-3);
    box-shadow: var(--elevation-1);
    display: grid;
    gap: var(--space-2);
    align-content: start;
}

.home-example-pack-badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: var(--radius-pill);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    background: var(--mode-accent-bg);
    color: var(--mode-accent-text);
    border: 1px solid var(--mode-accent-border);
    width: fit-content;
}

.home-example-pack h3 {
    margin: 0;
    font-size: 1.1rem;
    color: var(--text-strong);
}

.home-example-pack p {
    margin: 0;
    line-height: 1.56;
}

.home-example-pack-meta {
    font-size: 0.85rem;
}

/* Final CTA section */
.home-final-cta {
    max-width: 840px;
    text-align: center;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    background: var(--surface);
    padding: var(--space-5);
    box-shadow: var(--elevation-2);
}

.home-final-cta h2 {
    margin-bottom: var(--space-3);
}

.home-final-cta .actions {
    justify-content: center;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .home-hero-layout {
        grid-template-columns: 1fr;
    }

    .home-mode-preview-grid {
        grid-template-columns: 1fr;
        gap: var(--space-2);
    }

    .home-modes-grid {
        grid-template-columns: 1fr;
    }

    .home-dashboard-mock-metrics {
        grid-template-columns: 1fr;
    }

    .home-example-packs-grid {
        grid-template-columns: 1fr;
    }

    .home-section-bg {
        padding-top: var(--space-4);
        padding-bottom: var(--space-4);
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .home-example-packs-grid {
        grid-template-columns: 1fr 1fr;
    }

    .home-mode-preview-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1025px) {
    .home-hero-layout {
        grid-template-columns: 1.2fr 1fr;
        gap: var(--space-6);
        align-items: center;
    }
}

.pack-shell {
    max-width: 980px;
    margin: 0 auto;
    display: grid;
    gap: var(--rhythm-3);
}

.pack-hero,
.pack-preview-panel {
    margin-bottom: 0;
}

.pack-meta {
    margin-bottom: var(--space-1);
}

.pack-description {
    margin-bottom: var(--rhythm-2);
    color: #3b4c49;
}

.pack-preview-grid {
    display: grid;
    gap: var(--space-2);
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.pack-preview-card {
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-lg);
    background: var(--surface);
    padding: var(--space-3);
    box-shadow: var(--elevation-2);
    display: grid;
    gap: 8px;
    align-content: start;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}

.pack-preview-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--elevation-3);
    border-color: #c3d5d0;
}

.pack-preview-label {
    margin: 0;
    font-size: 0.72rem;
    color: var(--text-muted);
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.pack-preview-front {
    margin: 0;
    font-size: 1.02rem;
    font-weight: 680;
    line-height: 1.45;
    color: var(--text-strong);
}

.pack-preview-back {
    margin: 0;
    color: var(--text-muted);
    line-height: 1.56;
    font-size: 0.92rem;
}

.home-benefit-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: var(--space-3);
}

.home-benefit-list li {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: var(--space-3);
    color: #32413e;
    box-shadow: var(--elevation-1);
}

.account-settings-shell {
    display: grid;
    gap: var(--space-3);
}

.account-error-card {
    margin-bottom: 0;
}

.account-tools-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-3);
    align-items: stretch;
}

.account-tool-card {
    margin-bottom: 0;
    min-height: 100%;
    padding: var(--space-4);
    border: 1px solid var(--border);
    box-shadow: var(--elevation-1);
    display: flex;
    flex-direction: column;
    gap: 0;
}

.account-tool-card h2,
.account-tool-card h3 {
    margin-bottom: var(--space-2);
}

.account-info-card h2 {
    font-size: clamp(1.45rem, 2vw, 1.72rem);
}

.account-info-row {
    margin-bottom: var(--space-2);
}
.account-info-row:last-child {
    margin-bottom: 0;
}
.account-info-label {
    margin: 0 0 4px 0;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}
.account-info-value {
    margin: 0;
    font-size: 1rem;
    color: var(--text-strong);
}

.account-section-desc {
    margin: 0 0 var(--space-2) 0;
}
.account-section-footer {
    margin: var(--space-3) 0 0 0;
    font-size: 0.9rem;
}
.account-section-footer a {
    text-decoration: underline;
}

.account-data-item {
    margin-bottom: var(--space-3);
}
.account-data-item:last-child {
    margin-bottom: 0;
}
.account-data-item.account-danger-item {
    padding-top: var(--space-3);
    border-top: 1px solid var(--border);
}

.account-email-label {
    margin: 0 0 4px 0;
    font-size: 0.74rem;
    font-weight: 620;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.account-email-value {
    margin: 0 0 var(--space-2) 0;
    font-size: 1rem;
    font-weight: 630;
    color: var(--text-strong);
}

.account-head-note {
    margin: 0;
}

.account-security-card p,
.account-export-card p {
    margin-bottom: var(--space-3);
}

.account-card-actions {
    margin-top: auto;
}

.account-card-actions form,
.account-card-actions .btn,
.account-card-actions a {
    margin-bottom: 0;
}

.account-inline-form {
    display: inline-block;
}

.account-danger-card {
    border-color: #e4cbc8;
    background: #fff9f8;
}

/* Modal Styles */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    backdrop-filter: blur(2px);
}

.modal-overlay[hidden] {
    display: none !important;
}

/* Modal content when used as overlay child (e.g. free limit modal) so it stays visible and centered */
.modal-overlay .modal {
    flex-shrink: 0;
}

.modal {
    position: relative;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--elevation-3);
    padding: 0;
    max-width: 500px;
    width: 90%;
    background: var(--surface);
    max-height: 90vh;
    overflow-y: auto;
}

.modal::backdrop {
    background: transparent;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4) var(--space-4) 0 var(--space-4);
    margin-bottom: var(--space-3);
    border-bottom: 1px solid var(--border);
}

.modal-header h2 {
    margin: 0;
    padding-bottom: var(--space-3);
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    transition: color var(--transition-fast), background-color var(--transition-fast);
    flex-shrink: 0;
}

.modal-close:hover {
    color: var(--text);
    background: var(--subtle-tint);
}

.modal-body {
    padding: 0 var(--space-4) var(--space-4) var(--space-4);
}

.modal-body p {
    margin-bottom: var(--space-2);
}

.danger-warning {
    margin: 0 0 var(--space-3) 0;
    color: var(--danger);
    font-weight: 500;
}

.modal-actions {
    display: flex;
    gap: var(--space-2);
    justify-content: flex-end;
    margin-top: var(--space-3);
}

.modal-actions .btn {
    margin: 0;
}

.create-set-modal {
    width: min(700px, 100%);
}

.mode-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
}

.mode-tile {
    display: flex;
    align-items: center;
    gap: 8px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 10px 12px;
    cursor: pointer;
    transition: background var(--transition-fast), border-color var(--transition-fast);
}

.mode-tile:hover {
    background: var(--surface-elevated);
    border-color: var(--primary);
}

.mode-tile input[type="radio"] {
    margin: 0;
}

@media (max-width: 920px) {
    .account-tools-grid {
        grid-template-columns: 1fr;
    }

    .modal {
        width: 95%;
    }
}

.library-page-shell {
    display: grid;
    gap: var(--space-4);
}

.library-trust-note {
    margin: 0;
    font-size: 0.84rem;
}

.library-actions-card {
    margin-bottom: 0;
    padding: var(--space-3);
}

.library-actions {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    flex-wrap: wrap;
}

.library-empty-state {
    margin-bottom: 0;
    border-style: dashed;
    display: grid;
    gap: var(--space-1);
}

.library-empty-state h3 {
    margin-bottom: 2px;
}

.library-empty-state p {
    margin: 0;
}

.library-empty-placeholder {
    margin-top: var(--space-1);
    border: 1px dashed var(--border);
    border-radius: var(--radius-sm);
    min-height: 52px;
    padding: var(--space-1) var(--space-2);
    color: var(--muted);
    font-size: 0.8rem;
    display: flex;
    align-items: center;
}

.import-shell {
    display: grid;
    gap: var(--space-4);
    max-width: 980px;
}

.import-card {
    margin-bottom: 0;
}

.import-step-block {
    display: grid;
    gap: var(--space-2);
}

.import-step-title {
    margin: 0;
}

.import-example {
    margin: 0 0 var(--space-3) 0;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--subtle-tint);
    padding: var(--space-3);
    color: #32413e;
    font: 0.9rem/1.5 ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
    white-space: pre-wrap;
}

.import-preview-card {
    border-color: #c9ddd8;
    background: var(--surface-elevated);
}

.import-textarea {
    min-height: 260px;
}

.import-error-list {
    margin: var(--space-1) 0 0;
    padding-left: 1.25rem;
}

.import-error-list li {
    margin: 0 0 4px;
}

.import-row-error td {
    background: rgba(178, 58, 60, 0.08);
}

.table-scroll {
    overflow-x: auto;
    max-width: 100%;
}

.import-preview-list {
    gap: var(--space-1);
    max-height: 420px;
    overflow-y: auto;
}

/* =============================================================================
   CREATE STUDY SET WIZARD STYLES
   ============================================================================= */

.create-set-shell {
    max-width: 800px;
    margin: 0 auto;
}

.step-header {
    margin-bottom: 24px;
}

.step-header-meta {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 4px;
}

.step-counter {
    font-size: 0.875rem;
    color: var(--color-text-muted, #666);
    margin-top: 4px;
}

.mode-pill {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 10px;
    border-radius: 999px;
    border: 1px solid var(--primary, #2ac6c4);
    background: rgba(42, 198, 196, 0.08);
    color: var(--primary, #2ac6c4);
    font-size: 0.8rem;
}

/* Step 1: Mode Selection Grid */
.mode-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin: 24px 0;
}

.mode-tile {
    display: block;
    cursor: pointer;
    margin: 0;
}

.mode-tile__input {
    display: none;
}

.mode-tile__inner {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    padding: 24px 16px;
    border: 2px solid #ddd;
    border-radius: 12px;
    background-color: #fff;
    transition: all 0.2s ease;
    text-align: center;
    min-height: 220px;
    justify-content: space-between;
}

.mode-tile:hover .mode-tile__inner {
    border-color: #bbb;
    background-color: #fafafa;
}

.mode-tile__input:checked ~ .mode-tile__inner {
    border-color: var(--primary, #2ac6c4);
    background-color: rgba(42, 198, 196, 0.08);
}

.mode-tile__input:focus-visible ~ .mode-tile__inner {
    outline: 2px solid var(--primary, #2ac6c4);
    outline-offset: 2px;
}

.mode-tile__check {
    position: absolute;
    top: 10px;
    right: 10px;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: none;
    align-items: center;
    justify-content: center;
    background: var(--primary, #2ac6c4);
    color: #fff;
    font-size: 0.75rem;
    font-weight: 700;
    line-height: 1;
}

.mode-tile__input:checked ~ .mode-tile__inner .mode-tile__check {
    display: flex;
}

.mode-tile__media {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    background-color: #f5f5f5;
    border: 1px solid #e0e0e0;
    flex-shrink: 0;
}

.mode-tile__icon {
    font-size: 36px;
    line-height: 1;
}

.mode-tile__content {
    flex: 0 1 auto;
}

.mode-tile__title {
    font-size: 1rem;
    font-weight: 600;
    margin: 0;
    color: #222;
}

.mode-tile__subtitle {
    font-size: 0.8rem;
    color: #666;
    margin: 4px 0 0 0;
}

.mode-tile__selector {
    text-align: center;
    margin-top: auto;
}

.mode-tile__select-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--primary, #2ac6c4);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

@media (max-width: 600px) {
    .mode-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    
    .mode-tile__inner {
        min-height: 160px;
        padding: 20px 12px;
        gap: 12px;
    }
}

.item-builder {
    margin: 20px 0;
}

/* -----------------------------------------------------------------------------
   FLASHCARD BUILDER - Step 3 
   Grid-based layout for side-by-side Front/Back textareas
   ----------------------------------------------------------------------------- */

.flashcard-builder-container {
    max-width: 920px;
    margin: 0 auto;
    padding: 0 16px;
}

.flashcard-grid {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin: 24px 0;
}

.flashcard-row {
    display: grid !important;
    grid-template-columns: repeat(2, minmax(0, 1fr)) !important;
    gap: 20px !important;
}

/* CRITICAL: Override global textarea{width:100%} for flashcard grid children
   In a CSS grid, width:100% means "100% of the grid cell", which is correct.
   Box-sizing ensures padding doesn't break the layout. */
.flashcard-row > textarea.builder-input,
.flashcard-row > .flash-front,
.flashcard-row > .flash-back {
    width: 100% !important;
    max-width: 100% !important;
    box-sizing: border-box !important;
    min-height: 120px !important;
}

.add-card-btn {
    display: block;
    margin: 24px auto 0;
}

/* -----------------------------------------------------------------------------
   MATCH BUILDER - Step 3 
   Grid-based layout matching Flashcard builder pattern
   ----------------------------------------------------------------------------- */

.match-builder-container {
    max-width: 920px;
    margin: 0 auto;
    padding: 0 16px;
}

.match-grid {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin: 24px 0;
}

.match-row {
    display: grid !important;
    grid-template-columns: repeat(2, minmax(0, 1fr)) !important;
    gap: 20px !important;
}

/* Override global textarea{width:100%} for match grid children */
.match-row > textarea.builder-input,
.match-row > .match-left,
.match-row > .match-right {
    width: 100% !important;
    max-width: 100% !important;
    box-sizing: border-box !important;
    min-height: 80px !important;
}

.add-pair-btn {
    display: block;
    margin: 24px auto 0;
}

/* Other builders (Quiz, Match, Write) */
.builder-input {
    width: 100%;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-family: inherit;
    font-size: 0.95rem;
    resize: vertical;
    min-height: 60px;
}

.builder-input:focus {
    outline: none;
    border-color: #0066cc;
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.quiz-item,
.write-item {
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 16px;
    background-color: #fafafa;
}

.quiz-item-num,
.write-item-num {
    font-weight: 600;
    font-size: 0.875rem;
    color: #666;
    margin-bottom: 12px;
}

.form-group {
    margin-bottom: 12px;
}

.form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: 4px;
    font-size: 0.95rem;
}

.add-row-btn {
    font-size: 0.875rem;
    padding: 6px 12px;
}

.actions {
    display: flex;
    gap: 8px;
    margin-top: 24px;
}

.actions button,
.actions a {
    flex: 1;
}

@media (max-width: 600px) {
    .mode-grid-large {
        grid-template-columns: 1fr;
    }
    
    .builder-table {
        font-size: 0.875rem;
    }
    
    .builder-input {
        min-height: 50px;
    }
}

.onboarding-shell {
    max-width: 980px;
    margin: 0 auto;
    display: grid;
    gap: var(--rhythm-3);
}

.onboarding-page .main-content {
    padding-top: var(--rhythm-3);
}

.onboarding-hero {
    margin-bottom: 0;
}

.onboarding-step {
    margin: 0 0 var(--space-1);
    font-size: 0.76rem;
    font-weight: 620;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--muted);
}

.onboarding-hero h2 {
    margin-bottom: var(--space-1);
}

.onboarding-placeholder {
    margin-top: var(--space-2);
    border: 1px dashed var(--border);
    border-radius: var(--radius-sm);
    min-height: 56px;
    padding: var(--space-1) var(--space-2);
    color: var(--muted);
    font-size: 0.8rem;
    display: flex;
    align-items: center;
}

.onboarding-form {
    display: grid;
    gap: var(--rhythm-3);
}

.onboarding-grid {
    gap: var(--space-2);
}

.onboarding-pack-card {
    cursor: pointer;
}

.onboarding-pack-card.is-selected {
    border-color: var(--primary);
    box-shadow: var(--elevation-3);
}

.onboarding-pack-card.is-selected .pack-module-select span {
    color: var(--primary-active);
}

.onboarding-actions {
    justify-content: flex-start;
}

.onboarding-actions-note,
.onboarding-trust-note {
    margin: 0;
    font-size: 0.84rem;
}

.form-hint {
    margin: var(--space-1) 0 0;
    font-size: 0.82rem;
}

.legal-shell {
    max-width: 900px;
    margin: 0 auto;
    display: grid;
    gap: var(--space-3);
}

.legal-head {
    margin-bottom: 0;
}

.legal-head h1 {
    margin-bottom: var(--space-1);
}

.legal-section {
    margin-bottom: 0;
}

.legal-list {
    margin: 0;
    padding-left: 20px;
    display: grid;
    gap: var(--space-1);
}

/* ---------- LEGAL PAGE RHYTHM FIX ---------- */

.legal-section {
    margin-bottom: 0;
}

/* Headings inside legal cards */
.legal-section h2 {
    margin-bottom: var(--rhythm-2);
}

.legal-section h3 {
    margin-top: var(--rhythm-3);
    margin-bottom: var(--space-1);
    font-weight: 600;
}

/* Paragraph rhythm */
.legal-section p {
    margin-bottom: var(--rhythm-2);
}

/* Lists */
.legal-list {
    margin: 0 0 var(--rhythm-2) 0;
    padding-left: 20px;
    display: grid;
    gap: var(--space-1);
}

.legal-list li {
    margin: 0;
}

/* Tighten spacing when a heading follows a list */
.legal-list + h3,
.legal-list + p {
    margin-top: var(--rhythm-3);
}

/* Remove extra bottom spacing if last element */
.legal-section > :last-child {
    margin-bottom: 0;
}

/* ===== Phase 1 Elevation ===== */

.home-main {
    position: relative;
    isolation: isolate;
}

.home-main::before {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(76% 40% at 8% 6%, rgba(11, 155, 136, 0.07) 0%, rgba(11, 155, 136, 0) 100%);
    pointer-events: none;
    z-index: -1;
}

.home-hero {
    box-shadow: var(--elevation-2);
    border-color: #c7d9d5;
}

.home-hero-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: var(--space-4);
    align-items: center;
}

.home-hero-content,
.home-hero-visual {
    min-width: 0;
}

.home-hero-visual-mock {
    width: 100%;
    aspect-ratio: 16 / 10;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-md);
    background: linear-gradient(155deg, var(--subtle-tint) 0%, var(--surface) 72%);
    box-shadow: var(--elevation-1);
}

.home-step-card {
    box-shadow: var(--elevation-2);
    border-color: #cad9d5;
}

.home-step-icon {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-pill);
    border: 1px solid var(--border-strong);
    background: var(--subtle-tint);
    margin-bottom: var(--space-1);
    display: inline-flex;
}

.home-step-number {
    margin-bottom: 6px;
    font-size: 0.78rem;
    font-weight: 700;
}

.home-step-card h3 {
    margin-bottom: var(--space-1);
}

.home-pack-item {
    position: relative;
    overflow: hidden;
    border-color: #c5d7d2;
    box-shadow: var(--elevation-2);
}

.home-pack-item::after {
    content: "";
    position: absolute;
    top: -34px;
    right: -34px;
    width: 92px;
    height: 92px;
    border-radius: var(--radius-pill);
    background: color-mix(in srgb, var(--pack-accent) 24%, var(--surface));
    pointer-events: none;
}

.home-pack-item .pack-module-title {
    font-size: 1.22rem;
}

.home-pack-item:hover {
    transform: translateY(-3px);
    border-color: #b8cec8;
    box-shadow: var(--elevation-3);
}

.pack-hero,
.pack-preview-panel {
    border-color: #c9d9d5;
    box-shadow: var(--elevation-2);
}

.pack-hero {
    background: linear-gradient(170deg, var(--subtle-tint) 0%, var(--surface) 62%);
}

.pack-preview-card {
    border-top: 3px solid #bfd4cf;
}

.pack-preview-card:hover {
    transform: translateY(-3px);
    border-color: #bad0ca;
}

.auth-visual {
    position: relative;
    overflow: hidden;
    box-shadow: var(--elevation-2);
}

.auth-visual::before {
    content: "";
    position: absolute;
    inset: 0;
    background: repeating-linear-gradient(136deg, transparent 0 26px, rgba(234, 245, 242, 0.8) 26px 27px);
    opacity: 0.44;
    pointer-events: none;
}

.auth-visual > * {
    position: relative;
    z-index: 1;
}

.auth-visual-mock {
    width: 100%;
    aspect-ratio: 4 / 3;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-md);
    background: linear-gradient(160deg, var(--surface-elevated) 0%, var(--surface) 100%);
    box-shadow: var(--elevation-1);
    margin-top: var(--space-2);
}

.auth-form-subtext {
    margin-bottom: var(--space-4);
}

.auth-form-grid > div {
    display: grid;
    gap: var(--space-1);
}

.checkbox-row {
    display: flex;
    align-items: flex-start;
    gap: var(--space-1);
    margin-top: 0;
}

.checkbox-row input[type="checkbox"] {
    margin-top: 2px;
}

@media (max-width: 1200px) {
    .pack-module-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .pack-preview-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}

@media (max-width: 900px) {
    .header-inner.has-primary {
        grid-template-columns: 1fr auto;
        grid-template-areas:
            "brand actions"
            "nav nav";
        row-gap: 8px;
        min-height: auto;
        padding-top: 10px;
        padding-bottom: 10px;
    }

    .header-left {
        grid-area: brand;
    }

    .header-nav-desktop .nav-primary {
        grid-area: nav;
        justify-self: start;
        width: 100%;
        overflow-x: auto;
        flex-wrap: nowrap;
        padding-bottom: 2px;
    }

    .nav-primary .nav-link {
        white-space: nowrap;
    }

    .header-actions {
        grid-area: actions;
    }

    .auth-layout {
        grid-template-columns: 1fr;
        min-height: auto;
    }

    .auth-form-wrap {
        order: 1;
    }

    .auth-visual {
        order: 2;
    }

    .pack-module-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .pack-preview-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .home-hero-layout {
        grid-template-columns: 1fr;
    }

}

@media (max-width: 768px) {
    .header-inner.has-primary {
        display: flex;
        flex-wrap: wrap;
        justify-content: space-between;
        align-items: center;
        grid-template-columns: unset;
        grid-template-areas: unset;
    }

    /* Hide desktop nav on mobile; same specificity as base rule so this wins by order */
    .header-inner:not(.has-primary) .header-nav-desktop,
    .header-inner.has-primary .header-nav-desktop {
        display: none;
    }

    .header-hamburger {
        display: flex;
    }

    .mobile-nav-panel {
        width: 100%;
        order: 3;
    }

    .footer-inner {
        flex-direction: column;
        align-items: flex-start;
        justify-content: center;
        padding-top: 12px;
        padding-bottom: 12px;
    }

    .footer-links {
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
    }
}

@media (max-width: 640px) {
    .header-inner {
        flex-direction: column;
        align-items: flex-start;
        padding-top: 10px;
        padding-bottom: 10px;
    }

    .header-inner.has-primary {
        grid-template-columns: 1fr;
        justify-items: stretch;
        flex-direction: row;
        flex-wrap: wrap;
    }

    .nav-primary,
    .header-actions,
    .header-left {
        justify-self: start;
    }

    .header-nav-desktop .nav-primary {
        width: 100%;
    }

    .header-actions {
        width: 100%;
    }

    .nav-link,
    .user-menu-trigger {
        padding: 12px 14px;
        min-height: 44px;
        display: inline-flex;
        align-items: center;
    }

    .user-menu {
        width: 100%;
    }

    .user-menu-panel {
        position: static;
        margin-top: 6px;
        width: 100%;
        min-width: 0;
        box-shadow: none;
    }

    .footer-inner {
        flex-direction: column;
        align-items: flex-start;
        justify-content: center;
        padding-top: 12px;
        padding-bottom: 12px;
    }

    .set-cards-head {
        flex-direction: column;
        align-items: flex-start;
    }

    .set-card-grid {
        grid-template-columns: 1fr;
    }

    .set-card-actions {
        margin-left: 0;
        width: 100%;
        justify-content: flex-start;
    }

    .set-secondary-study-group {
        width: 100%;
        gap: 6px;
    }

    .set-study-option {
        border-right-width: 1px;
        border-radius: var(--radius-sm);
    }

    .library-actions .btn {
        width: auto;
    }

    .onboarding-actions .btn {
        width: auto;
    }

    .curated-dashboard-head,
    .library-head {
        flex-direction: column;
        align-items: flex-start;
    }

    .weekly-stats-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .library-toolbar {
        width: 100%;
        justify-content: flex-start;
    }

    .library-search {
        width: 100%;
        min-width: 0;
    }

    .study-focus-layout {
        min-height: auto;
    }

    .study-topbar {
        flex-direction: column;
        align-items: flex-start;
    }

    .session-summary-grid {
        grid-template-columns: 1fr;
    }

    .snapshot-visual-placeholders {
        grid-template-columns: 1fr;
    }

    .study-top-actions {
        justify-content: flex-start;
    }

    .study-top-actions .btn {
        width: auto;
    }

    .study-card {
        padding: var(--space-4);
    }

    .study-flip-inner {
        min-height: 320px;
    }

    .study-face {
        padding: var(--space-4);
    }

    .main-content {
        padding-top: var(--rhythm-3);
        padding-bottom: var(--rhythm-4);
    }

    h1 {
        font-size: 1.7rem;
    }

    h2 {
        font-size: 1.3rem;
    }

    .card {
        padding: var(--space-4);
    }

    .actions {
        width: 100%;
    }

    .btn {
        width: 100%;
        text-align: center;
    }

    .home-main {
        padding-top: var(--space-6);
        padding-bottom: var(--space-6);
    }

    .auth-page .main-content {
        padding: var(--rhythm-3) var(--rhythm-2) var(--space-4);
    }

    .auth-form-card,
    .auth-visual {
        padding: var(--space-4);
    }

    .auth-actions .btn {
        min-width: 0;
    }

    .home-hero {
        padding: var(--space-5);
    }

    .home-steps-grid,
    .home-pack-grid {
        grid-template-columns: 1fr;
    }

    .pack-module-grid {
        grid-template-columns: 1fr;
    }

    .pack-preview-grid {
        grid-template-columns: 1fr;
    }

    .home-actions .btn {
        width: auto;
        min-width: 132px;
    }
}

/* Chart empty state styling */
.chart-empty-state {
    text-align: center;
    padding: 20px;
    color: #9ca3af;
    display: none;
}

.chart-empty-state.is-visible {
    display: block;
}

.chart-canvas {
    display: none;
}

.chart-canvas.is-visible {
    display: block !important;
}

/* This Week panel subsection styling */
.this-week-panel {
    display: flex;
    flex-direction: column;
}

.weekly-summary-subsection {
    display: flex;
    flex-direction: column;
}

.weekly-summary-subsection h4 {
    font-size: 1rem;
    font-weight: 600;
    margin: 0 0 1rem 0;
    color: #1f2937;
}

.top-sets-subsection {
    display: flex;
    flex-direction: column;
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid #e5e7eb;
}

.top-sets-subsection h4 {
    font-size: 1rem;
    font-weight: 600;
    margin: 0 0 0.5rem 0;
    color: #1f2937;
}

/* Curated Sets Section */
.curated-sets-section {
    margin-bottom: 1.5rem;
}

.curated-sets-section .section-heading h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 0;
    color: #1f2937;
}

/* Library Actions in Header (desktop) */
.library-head .library-actions-inline {
    margin-top: 1rem;
    gap: 0.5rem;
}

.library-head .library-actions-inline .btn {
    font-size: 0.875rem;
    padding: 0.5rem 1rem;
}

/* Library actions footer (mobile only, shown via media query) */
.library-actions-footer {
    display: none;
    margin-top: var(--space-3);
    gap: var(--space-2);
}

/* Mobile: reorder sections — user's library first, curated last */
@media (max-width: 768px) {
    .library-page-shell {
        display: flex;
        flex-direction: column;
    }

    .library-page-shell .sets-panel {
        order: 1;
    }

    .library-page-shell .curated-sets-section {
        order: 2;
    }

    .sets-panel {
        display: flex;
        flex-direction: column;
    }

    .sets-panel .section-heading.library-head {
        order: 1;
    }

    .sets-panel .library-mode-tabs {
        order: 2;
    }

    .sets-panel .library-list,
    .sets-panel .library-empty-state,
    .sets-panel > p.muted {
        order: 3;
    }

    .sets-panel .library-actions-footer {
        order: 4;
        display: flex;
        flex-wrap: wrap;
    }

    .sets-panel .library-actions-footer .btn {
        font-size: 0.875rem;
        padding: 0.5rem 1rem;
    }

    .library-head .library-actions-inline {
        display: none;
    }
}

/* Curated Sets Section */
.curated-section-heading {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.curated-section-heading h2 {
    margin: 0;
}

.view-more-link {
    font-size: 0.875rem;
    color: #0066cc;
    text-decoration: none;
    font-weight: 500;
    white-space: nowrap;
}

.view-more-link:hover {
    text-decoration: underline;
    color: #0052a3;
}

@media (max-width: 768px) {
    .curated-section-heading {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }
}

@media (max-width: 600px) {
    .set-hero-top-actions {
        justify-content: flex-start;
        flex-wrap: wrap;
    }
    
    .progress-label {
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
    }
}

/* Pricing page */
.pricing-shell {
    max-width: 900px;
    margin: 0 auto;
    padding: 32px 0;
}
.pricing-title {
    text-align: center;
    margin-bottom: 32px;
}
.pricing-table-grid {
    display: flex;
    gap: 32px;
    justify-content: center;
    align-items: flex-start;
}
.pricing-card {
    flex: 1 1 350px;
    padding: 32px 24px;
    min-width: 320px;
    max-width: 420px;
    box-sizing: border-box;
}
.pricing-features-list {
    margin: 24px 0 32px 0;
    padding: 0;
    list-style: none;
}
.pricing-features-list li {
    margin-bottom: 12px;
    font-size: 1.1rem;
}
.pricing-pro-cta {
    margin-top: 32px;
}
.pricing-current-plan {
    margin-bottom: 1em;
}
.pricing-billing-label {
    margin: 0 0 8px 0;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted, #6b7280);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}
.pricing-billing-toggle {
    display: flex;
    gap: 0;
    margin-bottom: 12px;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border-color, #e5e7eb);
    background: var(--bg-muted, #f3f4f6);
}
.pricing-billing-option {
    flex: 1;
    padding: 10px 16px;
    font-size: 1rem;
    font-weight: 500;
    border: none;
    background: transparent;
    color: var(--text-muted, #6b7280);
    cursor: pointer;
    transition: background 0.2s, color 0.2s;
}
.pricing-billing-option:hover {
    color: var(--text-color, #111);
}
.pricing-billing-option.is-active {
    background: var(--color-primary, #0ea5e9);
    color: #fff;
}
.pricing-selected-price {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--color-primary, #0ea5e9);
    margin: 0 0 16px 0;
}
.pricing-upgrade-form {
    margin-top: 0;
}
.pricing-btn {
    min-width: 120px;
    margin-top: 0;
}

@media (max-width: 700px) {
    .pricing-table-grid {
        flex-direction: column;
        align-items: stretch;
    }

    .pricing-card {
        min-width: 0;
        width: 100%;
        max-width: none;
    }
}

/* Small phones: reduce horizontal padding so content is less cramped */
@media (max-width: 400px) {
    .container {
        padding-left: 16px;
        padding-right: 16px;
    }
}