/* Classbook - Minimal, functional CSS */

:root {
    --color-bg: #1a1a1a;
    --color-surface: #2a2a2a;
    --color-surface-hover: #333;
    --color-text: #e0e0e0;
    --color-text-muted: #888;
    --color-accent: #4a9eff;
    --color-border: #404040;
    --radius: 8px;
    --spacing: 1rem;
    --max-width: 1200px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 16px;
    line-height: 1.5;
    color: var(--color-text);
    background-color: var(--color-bg);
}

body {
    min-height: 100vh;
}

body.modal-open {
    overflow: hidden;
}

a {
    color: var(--color-accent);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* Hero Banner (home page only, inside .content) */
.hero {
    margin: calc(-1 * var(--spacing)) calc(-1 * var(--spacing)) var(--spacing);
}

.hero-banner {
    width: 100%;
    height: 250px;
    object-fit: cover;
    object-position: center 30%;
    display: block;
}

.hero-content {
    padding: 0 var(--spacing);
}

.hero-logo {
    width: 80px;
    height: 80px;
    border-radius: 16px;
    object-fit: contain;
    background: #fff;
    padding: 4px;
    margin-top: -40px;
    margin-bottom: var(--spacing);
    position: relative;
}

/* Header */
.site-header {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing);
    position: sticky;
    top: 0;
    z-index: 100;
}

.site-header.scroll-animating {
    position: fixed;
    width: 100%;
}

.header-content {
    max-width: var(--max-width);
    margin: 0 auto;
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

/* Breadcrumb */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    min-width: 0;
    color: var(--color-text);
    text-decoration: none;
    transition: opacity 0.15s ease;
}

.breadcrumb:hover {
    color: var(--color-text);
    text-decoration: none;
    opacity: 0.8;
}

.breadcrumb-logo {
    width: 24px;
    height: 24px;
    border-radius: 4px;
    object-fit: contain;
    background: #fff;
    padding: 1px;
    flex-shrink: 0;
}

.breadcrumb-title {
    font-size: 1rem;
    font-weight: 600;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Tab Navigation */
.tab-nav {
    display: flex;
    gap: 0;
    border-bottom: 1px solid var(--color-border);
    margin: 0 calc(-1 * var(--spacing));
    padding: 0 var(--spacing);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    touch-action: pan-x;
}

.tab-nav::-webkit-scrollbar {
    display: none;
}

.tab {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.5rem 0.75rem;
    color: var(--color-text-muted);
    font-size: 0.875rem;
    text-decoration: none;
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
    transition: color 0.15s ease, border-color 0.15s ease;
    white-space: nowrap;
    flex-shrink: 0;
}

.tab:hover {
    color: var(--color-text);
    text-decoration: none;
}

.tab-active {
    color: #fff;
    border-bottom-color: var(--color-accent);
}

.tab-active:hover {
    color: #fff;
}

.tab-icon {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
    opacity: 0.6;
    transition: opacity 0.15s ease;
}

.tab:hover .tab-icon {
    opacity: 0.8;
}

.tab-active .tab-icon {
    opacity: 1;
    filter: brightness(1.4);
}

.tab-label {
    /* label can be hidden on very narrow screens if needed */
}

/* Header Actions */
.header-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-shrink: 0;
}

/* Auth Buttons */
.auth-buttons {
    display: flex;
    gap: 0.5rem;
    flex-shrink: 0;
}

.auth-btn {
    padding: 0.375rem 0.75rem;
    font-size: 0.8rem;
    border-radius: var(--radius);
    text-decoration: none;
    transition: opacity 0.15s ease, background 0.15s ease;
    white-space: nowrap;
}

.auth-btn-secondary {
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.auth-btn-secondary:hover {
    background: var(--color-surface-hover);
    text-decoration: none;
    color: var(--color-text);
}

.auth-btn-primary {
    color: #fff;
    background: var(--color-accent);
}

.auth-btn-primary:hover {
    opacity: 0.9;
    text-decoration: none;
    color: #fff;
}

/* User Menu (avatar) */
.user-menu {
    position: relative;
    flex-shrink: 0;
}

.avatar-btn {
    width: 33px;
    height: 33px;
    border-radius: 50%;
    background: #3d4f3d;
    color: #b8d4b8;
    border: none;
    font-size: 0.7rem;
    font-weight: 600;
    font-family: inherit;
    letter-spacing: 0.02em;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.15s ease;
}

.avatar-btn:hover {
    opacity: 0.85;
}

.avatar-sm {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: #3d4f3d;
    color: #b8d4b8;
    font-size: 0.65rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.user-menu-dropdown {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 4px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    width: 258px;
    z-index: 200;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

.user-menu-dropdown.open {
    display: block;
}

.user-menu-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 0.75rem;
}

.user-menu-email {
    font-size: 0.8rem;
    color: var(--color-text);
    overflow: hidden;
    white-space: nowrap;
    flex: 1;
    min-width: 0;
}

.user-menu-close {
    display: none;
    background: none;
    border: none;
    color: var(--color-text-muted);
    font-size: 1.25rem;
    cursor: pointer;
    padding: 0;
    margin-left: auto;
    line-height: 1;
    flex-shrink: 0;
}

.user-menu-divider {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: 0;
}

.user-menu-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    width: 100%;
    padding: 0.5rem 0.75rem;
    background: none;
    border: none;
    color: var(--color-text);
    font-size: 0.8rem;
    font-family: inherit;
    text-align: left;
    cursor: pointer;
    transition: background 0.15s ease;
}

.user-menu-item:hover {
    background: var(--color-surface-hover);
}

.user-menu-icon {
    width: 20px;
    height: 20px;
    opacity: 0.7;
    filter: invert(0.85);
}

@media (max-width: 770px) {
    .user-menu-dropdown {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        width: 100%;
        margin-top: 0;
        border: none;
        border-radius: 0;
        z-index: 1000;
        overflow-y: auto;
    }

    .user-menu-close {
        display: block;
    }

    body.user-menu-open {
        overflow: hidden;
    }
}

/* Study Toggle */
.study-toggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    user-select: none;
    flex-shrink: 0;
}

.study-toggle input {
    display: none;
}

.study-toggle-slider {
    position: relative;
    width: 36px;
    height: 20px;
    background: var(--color-border);
    border-radius: 10px;
    transition: background 0.2s ease;
}

.study-toggle-slider::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 16px;
    height: 16px;
    background: var(--color-text-muted);
    border-radius: 50%;
    transition: transform 0.2s ease, background 0.2s ease;
}

.study-toggle input:checked + .study-toggle-slider {
    background: var(--color-accent);
}

.study-toggle input:checked + .study-toggle-slider::after {
    transform: translateX(16px);
    background: #fff;
}

.study-toggle-label {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    transition: color 0.2s ease;
}

.study-toggle-label-browse {
    color: var(--color-text);
}

.study-toggle input:checked ~ .study-toggle-label-study {
    color: var(--color-text);
}

.study-toggle:has(input:checked) .study-toggle-label-browse {
    color: var(--color-text-muted);
}

/* Verification Banner */
.verify-banner {
    background: #92600e;
    color: #fef3c7;
    padding: 0.5rem var(--spacing);
    font-size: 0.85rem;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    max-height: 3rem;
    overflow: hidden;
}

.verify-banner-resend {
    color: #fef3c7;
    text-decoration: underline;
    cursor: pointer;
}

.verify-banner-resend:hover {
    opacity: 0.8;
}

.verify-banner-close {
    background: none;
    border: none;
    color: #fef3c7;
    font-size: 1.25rem;
    cursor: pointer;
    padding: 0;
    line-height: 1;
    opacity: 0.7;
    transition: opacity 0.15s ease;
}

.verify-banner-close:hover {
    opacity: 1;
}

.verify-banner-verified {
    background: #166534;
    color: #bbf7d0;
    transition: background 0.3s ease, color 0.3s ease;
}

.verify-banner-dismissing {
    opacity: 0;
    max-height: 0;
    padding-top: 0;
    padding-bottom: 0;
    overflow: hidden;
    transition: opacity 0.3s ease, max-height 0.3s ease, padding 0.3s ease;
}

/* Main content */
.content {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing);
}

/* Entity sections */
.entity-section {
    margin-bottom: calc(var(--spacing) * 3);
}

.entity-section h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing);
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--color-border);
}

.section-heading {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: #fff;
    text-decoration: none;
}

.section-heading:hover {
    color: #fff;
    text-decoration: none;
}

.section-heading-icon {
    width: 20px;
    height: 20px;
    filter: brightness(1.4);
    transition: opacity 0.15s ease;
}

.section-heading:hover .section-heading-icon {
    opacity: 0.7;
}

/* Anchor targets scroll to just below the sticky header with breathing room */
#students, #families, #parents, #teachers {
    scroll-margin-top: calc(var(--header-height, 110px) + 0.75rem);
}

.empty-message {
    color: var(--color-text-muted);
    font-style: italic;
}

/* Gallery grid */
.gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: var(--spacing);
}

@media (min-width: 768px) {
    .gallery {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    }
}

/* Cards */
.card {
    background: var(--color-surface);
    border-radius: var(--radius);
    overflow: hidden;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
    display: flex;
    flex-direction: column;
}

.card.selected {
    outline: 2px solid var(--color-accent);
    outline-offset: -2px;
}

.card:hover .card-body {
    background: var(--color-surface-hover);
}

.card-link {
    display: block;
    color: inherit;
    text-decoration: none;
    flex-shrink: 0;
}

.card-link:hover {
    text-decoration: none;
}

.card-image {
    aspect-ratio: 1;
    overflow: hidden;
    background: var(--color-bg);
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.card-image-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-border);
    font-size: 2rem;
    font-weight: 600;
    color: var(--color-text-muted);
}

.card-body {
    padding: 0.75rem;
    transition: background 0.15s ease;
    flex: 1;
}

.card-title {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 0.25rem;
    overflow: hidden;
    white-space: nowrap;
    color: #fff;
}

.card-subtitle {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.8rem;
    color: var(--color-text-muted);
    overflow: hidden;
    white-space: nowrap;
}

.card-subtitle .entity-icon {
    transition: opacity 0.15s ease;
}

.card-subtitle-link:hover .card-subtitle {
    color: var(--color-text);
}

.card-subtitle-link:hover .entity-icon {
    opacity: 0.9;
}

.card-title-text,
.card-subtitle-text {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    min-width: 0;
}

/* Card entity rows (family cards with linked members) */
.card-entity-row {
    display: flex;
    flex-wrap: wrap;
    column-gap: 0.5rem;
    row-gap: 0.1rem;
    align-items: center;
    margin-top: 0.25rem;
}

.card-entity-link {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    max-width: 100%;
    color: var(--color-text-muted);
    text-decoration: none;
    font-size: 0.8rem;
    transition: color 0.15s ease;
}

.card-entity-link:hover {
    color: var(--color-text);
    text-decoration: none;
}

.card-entity-link .entity-icon {
    transition: opacity 0.15s ease;
}

.card-entity-link:hover .entity-icon {
    opacity: 0.9;
}

.card-entity-name {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    min-width: 0;
}

/* Entity type icons (cards and modals) */
.entity-icon {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
    opacity: 0.7;
}

.card-title .entity-icon {
    filter: brightness(1.4);
    opacity: 1;
    transition: opacity 0.15s ease;
}

.card-title:hover .entity-icon {
    opacity: 0.7;
}

/* Reposition button in modal */
.modal-image-wrapper {
    position: relative;
}

.reposition-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    background: rgba(0, 0, 0, 0.75);
    color: #fff;
    border: none;
    border-radius: 4px;
    padding: 4px 10px;
    font-size: 0.75rem;
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.15s ease;
    z-index: 5;
    pointer-events: none;
}

.modal-image-wrapper:hover .reposition-btn {
    opacity: 1;
    pointer-events: auto;
}

/* Reposition mode */
.modal-image-wrapper.repositioning {
    cursor: grab;
}

.modal-image-wrapper.repositioning:active {
    cursor: grabbing;
}

.modal-image-wrapper.repositioning .reposition-btn {
    display: none;
}

.reposition-controls {
    position: absolute;
    top: 8px;
    right: 8px;
    display: flex;
    gap: 8px;
    z-index: 5;
}

.reposition-controls button {
    background: rgba(0, 0, 0, 0.75);
    color: #fff;
    border: none;
    border-radius: 4px;
    padding: 4px 10px;
    font-size: 0.75rem;
    cursor: pointer;
    transition: background 0.15s ease;
}

.reposition-controls button:hover {
    background: rgba(0, 0, 0, 0.9);
}

.reposition-controls .save-btn {
    color: var(--color-accent);
}

.reposition-hint {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(0, 0, 0, 0.7);
    color: #fff;
    border-radius: 4px;
    padding: 6px 12px;
    font-size: 0.75rem;
    white-space: nowrap;
    z-index: 5;
    pointer-events: none;
}

/* Study Mode */
.study-mode .tab-nav,
.study-mode .hero,
.study-mode .entity-section,
.study-mode .settings-page {
    display: none;
}

.study-mode .header-top,
body[data-page="settings"] .header-top {
    margin-bottom: 0;
}

#study-container {
    display: none;
    max-width: 400px;
    margin: 0 auto;
    text-align: center;
    padding-top: 1rem;
}

.study-mode #study-container {
    display: block;
}

.study-gear-wrapper {
    position: relative;
    z-index: 10;
}

.study-gear-standalone {
    float: right;
}

.study-gear-btn {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    cursor: pointer;
    padding: 5px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: border-color 0.15s ease;
    text-decoration: none;
}

.study-gear-btn:hover {
    border-color: var(--color-text-muted);
}

.study-gear-btn img {
    width: 16px;
    height: 16px;
    opacity: 0.5;
    filter: invert(0.85);
}

.study-gear-btn:hover img {
    opacity: 0.7;
}


.study-stats {
    border-collapse: collapse;
    table-layout: fixed;
    font-size: 0.85rem;
    margin: 1rem auto 0;
}

.study-stats th,
.study-stats td {
    padding: 0.1rem 0.5rem;
    text-align: center;
}

.study-gear-cell {
    vertical-align: middle;
}

.study-stats-header th {
    font-weight: 400;
    font-size: 0.75rem;
    padding-bottom: 0.15rem;
    color: var(--color-text-muted);
}

.study-stats-col-label {
    width: 3rem;
}

.study-stats-col-data {
    width: 3.5rem;
}

.study-stats-label {
    color: var(--color-text-muted);
    font-weight: 400;
    text-align: right;
    font-size: 0.75rem;
}

.study-stats-later {
}

.study-stat-new { color: #c050c0; }
.study-stat-learning { color: #e8a838; }
.study-stat-due { color: #4caf50; }
.study-stat-remaining { color: #9070d0; }
.study-stat-scheduled { color: #4a9eff; }

.study-card-image {
    aspect-ratio: 1;
    border-radius: var(--radius);
    overflow: hidden;
    background: var(--color-bg);
    margin-bottom: 1.5rem;
}

.study-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.study-card-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-border);
    font-size: 4rem;
    font-weight: 600;
    color: var(--color-text-muted);
}

.study-card-name {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 600;
    color: #fff;
    margin-bottom: 0.25rem;
}

.study-card-name .entity-icon {
    width: 22px;
    height: 22px;
    filter: brightness(1.4);
}

.study-card-detail {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
}

.study-card-detail a {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    color: var(--color-text-muted);
    text-decoration: none;
    transition: color 0.15s ease;
}

.study-card-detail a:hover {
    color: var(--color-text);
    text-decoration: none;
}

.study-card-detail a .entity-icon {
    width: 18px;
    height: 18px;
    transition: opacity 0.15s ease;
}

.study-card-detail a:hover .entity-icon {
    opacity: 0.9;
}

.study-show-btn {
    padding: 0.75rem 2rem;
    background: var(--color-surface);
    color: var(--color-text);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 1rem;
    font-family: inherit;
    cursor: pointer;
    transition: background 0.15s ease, border-color 0.15s ease;
}

.study-show-btn:hover, .study-show-btn.study-show-pressed {
    background: var(--color-surface-hover);
    border-color: var(--color-accent);
    color: #fff;
}

.study-show-btn:focus-visible {
    border-color: var(--color-accent);
    outline: none;
}

.study-rating {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
}

.study-rate-btn {
    flex: 1;
    max-width: 90px;
    padding: 0.5rem 0.25rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-surface);
    font-family: inherit;
    cursor: pointer;
    transition: background 0.15s ease, border-color 0.15s ease;
}

.study-rate-btn:hover, .study-rate-btn.study-rate-pressed { background: var(--color-surface-hover); }

.study-rate-again {
    background: rgba(239, 83, 80, 0.08);
    border-color: rgba(239, 83, 80, 0.3);
}

.study-rate-hard {
    background: rgba(232, 168, 56, 0.08);
    border-color: rgba(232, 168, 56, 0.3);
}

.study-rate-good {
    background: rgba(76, 175, 80, 0.08);
    border-color: rgba(76, 175, 80, 0.3);
}

.study-rate-easy {
    background: rgba(74, 158, 255, 0.08);
    border-color: rgba(74, 158, 255, 0.3);
}

.study-rate-label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
}

.study-rate-interval {
    display: block;
    font-size: 0.7rem;
    color: var(--color-text-muted);
    margin-top: 2px;
}

.study-rate-again .study-rate-label { color: #ef5350; }
.study-rate-hard .study-rate-label { color: #e8a838; }
.study-rate-good .study-rate-label { color: #4caf50; }
.study-rate-easy .study-rate-label { color: var(--color-accent); }

.study-rate-again:hover, .study-rate-again.study-rate-pressed { border-color: #ef5350; }
.study-rate-hard:hover, .study-rate-hard.study-rate-pressed { border-color: #e8a838; }
.study-rate-good:hover, .study-rate-good.study-rate-pressed { border-color: #4caf50; }
.study-rate-easy:hover, .study-rate-easy.study-rate-pressed { border-color: var(--color-accent); }

.study-done {
    padding: 3rem 0;
}

.study-done h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: #fff;
    margin-bottom: 0.5rem;
}

.study-done p {
    color: var(--color-text-muted);
    margin-bottom: 0.25rem;
}

.study-done .study-done-next {
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
}

.study-done-notify {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-bottom: 1.5rem;
}

.study-done-optin-btn {
    background: none;
    border: none;
    color: var(--color-accent);
    font-size: inherit;
    font-family: inherit;
    cursor: pointer;
    padding: 0;
    text-decoration: underline;
    transition: opacity 0.15s ease;
}

.study-done-optin-btn:hover {
    opacity: 0.8;
}

/* Study Welcome Card */
.study-welcome {
    padding: 3rem 0;
}

.study-welcome h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: #fff;
    margin-bottom: 0.75rem;
}

.study-welcome p {
    color: var(--color-text-muted);
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

.study-welcome-detail {
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
}

.study-welcome-btn {
    padding: 0.75rem 2rem;
    background: var(--color-accent);
    color: #fff;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-family: inherit;
    font-weight: 500;
    cursor: pointer;
    transition: opacity 0.15s ease;
}

.study-welcome-btn:hover {
    opacity: 0.9;
}

/* Email Opt-in */
.study-optin-email {
    color: var(--color-text-muted);
    font-size: 0.85rem;
    margin-bottom: 1.5rem;
}

.study-optin-buttons {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    align-items: center;
}

.study-optin-yes {
    padding: 0.75rem 2rem;
    background: var(--color-accent);
    color: #fff;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-family: inherit;
    font-weight: 500;
    cursor: pointer;
    transition: opacity 0.15s ease;
}

.study-optin-yes:hover {
    opacity: 0.9;
}

.study-optin-no {
    padding: 0.5rem 1rem;
    background: none;
    color: var(--color-text-muted);
    border: none;
    font-size: 0.9rem;
    font-family: inherit;
    cursor: pointer;
    transition: color 0.15s ease;
}

.study-optin-no:hover {
    color: var(--color-text);
}

/* Coaching Hints */
.study-hint {
    color: var(--color-text-muted);
    font-size: 0.85rem;
    font-style: italic;
    margin-bottom: 0.75rem;
}

/* Help Modal */
.study-help-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: var(--spacing);
}

.study-help-modal {
    background: var(--color-surface);
    border-radius: var(--radius);
    max-width: 400px;
    width: 100%;
    max-height: 80vh;
    overflow-y: auto;
}

.study-help-modal .modal-header h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: #fff;
    margin: 0;
}

.study-help {
    text-align: left;
}

.study-help p {
    color: var(--color-text-muted);
    margin-bottom: 0.75rem;
    line-height: 1.6;
}

.study-help ul {
    list-style: none;
    margin: 0 0 1rem 0;
    padding: 0;
}

.study-help li {
    color: var(--color-text-muted);
    margin-bottom: 0.5rem;
    line-height: 1.5;
}

.study-help li strong {
    font-weight: 600;
}

.study-rate-label-nope { color: #ef5350; }
.study-rate-label-almost { color: #e8a838; }
.study-rate-label-gotit { color: #4caf50; }
.study-rate-label-easy { color: var(--color-accent); }

/* Auth Gate Modal */
.auth-gate-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    padding: var(--spacing);
}

.auth-gate-dialog {
    background: var(--color-surface);
    border-radius: var(--radius);
    padding: calc(var(--spacing) * 2);
    max-width: 360px;
    width: 100%;
    text-align: center;
}

.auth-gate-dialog h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: #fff;
    margin-bottom: 0.5rem;
}

.auth-gate-dialog p {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
}

.auth-gate-actions {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.auth-gate-btn {
    display: block;
    width: 100%;
    padding: 0.75rem 1rem;
    border-radius: var(--radius);
    font-size: 0.9rem;
    font-family: inherit;
    text-align: center;
    text-decoration: none;
    cursor: pointer;
    transition: opacity 0.15s ease, background 0.15s ease;
}

.auth-gate-btn-primary {
    background: var(--color-accent);
    color: #fff;
    border: none;
}

.auth-gate-btn-primary:hover {
    opacity: 0.9;
    color: #fff;
    text-decoration: none;
}

.auth-gate-btn-secondary {
    background: none;
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.auth-gate-btn-secondary:hover {
    background: var(--color-surface-hover);
    color: var(--color-text);
    text-decoration: none;
}

.auth-gate-btn-cancel {
    background: none;
    color: var(--color-text-muted);
    border: none;
    font-size: 0.85rem;
}

.auth-gate-btn-cancel:hover {
    color: var(--color-text);
}

/* Modal */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: var(--spacing);
    touch-action: manipulation;
}

.modal {
    background: var(--color-surface);
    border-radius: var(--radius);
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
}

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

.modal-close {
    background: none;
    border: none;
    color: var(--color-text-muted);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0;
    line-height: 1;
}

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

.modal-body {
    padding: var(--spacing);
}

.modal-image {
    display: block;
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
    border-radius: var(--radius);
    margin-bottom: var(--spacing);
}

.modal-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: #fff;
}

.modal-title .entity-icon {
    width: 22px;
    height: 22px;
    filter: brightness(1.4);
    opacity: 1;
}

.modal-meta {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.modal-meta p {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    margin-bottom: 0.25rem;
}

.modal-meta a {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    color: var(--color-text-muted);
    text-decoration: none;
    transition: color 0.15s ease;
}

.modal-meta a:hover {
    color: var(--color-text);
    text-decoration: none;
}

.modal-meta .entity-icon {
    transition: opacity 0.15s ease;
}

.modal-meta a:hover .entity-icon {
    opacity: 0.9;
}

/* Modal navigation buttons */
.modal-nav {
    position: fixed;
    top: 50%;
    transform: translateY(-50%);
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    color: var(--color-text);
    font-size: 1.75rem;
    line-height: 1;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1001;
    transition: background 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
    padding: 0;
    touch-action: manipulation;
}

.modal-nav:hover {
    background: var(--color-surface-hover);
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.modal-nav-prev {
    left: calc(50% - 282px);
}

.modal-nav-next {
    right: calc(50% - 282px);
}

@media (max-width: 600px) {
    .modal-nav-prev {
        left: 8px;
    }
    .modal-nav-next {
        right: 8px;
    }
    .modal-nav {
        background: rgba(42, 42, 42, 0.9);
    }
}

/* Modal placeholder */
.modal-image-placeholder {
    width: 100%;
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-border);
    border-radius: var(--radius);
    margin-bottom: var(--spacing);
    font-size: 3rem;
    font-weight: 600;
    color: var(--color-text-muted);
}


/* Login page */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing);
}

.login-card {
    background: var(--color-surface);
    border-radius: var(--radius);
    padding: calc(var(--spacing) * 2.5);
    width: 100%;
    max-width: 360px;
    text-align: center;
}

.login-title {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.login-subtitle {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
}

.login-error {
    color: #ef4444;
    font-size: 0.875rem;
    margin-bottom: 1rem;
}

.login-input {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    color: var(--color-text);
    font-size: 1rem;
    font-family: inherit;
    margin-bottom: 1rem;
    outline: none;
    transition: border-color 0.15s ease;
}

.login-input:focus {
    border-color: var(--color-accent);
}

.login-button {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--color-accent);
    color: #fff;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-family: inherit;
    font-weight: 500;
    cursor: pointer;
    transition: opacity 0.15s ease;
}

.login-button:hover {
    opacity: 0.9;
}

.auth-link {
    margin-top: 1rem;
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

/* Settings Page */
.settings-page {
    display: flex;
    gap: 2rem;
    max-width: 900px;
}

.settings-sidebar {
    flex-shrink: 0;
    width: 200px;
    position: sticky;
    top: calc(var(--header-height, 110px) + 1rem);
    align-self: flex-start;
}

.settings-nav {
    list-style: none;
    margin: 0;
    padding: 0;
}

.settings-nav-item {
    display: block;
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius);
    color: var(--color-text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    transition: background 0.15s ease, color 0.15s ease;
}

.settings-nav-item:hover {
    background: var(--color-surface);
    color: var(--color-text);
    text-decoration: none;
}

.settings-nav-active {
    background: var(--color-surface);
    color: #fff;
    font-weight: 500;
}

.settings-nav-active:hover {
    color: #fff;
}

.settings-content {
    flex: 1;
    min-width: 0;
}

.settings-heading {
    font-size: 1.25rem;
    font-weight: 600;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--color-border);
    margin-bottom: 1.5rem;
}

.settings-section {
    margin-bottom: 2rem;
}

.settings-section-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.settings-section-desc {
    color: var(--color-text-muted);
    font-size: 0.875rem;
    margin-bottom: 0.75rem;
}

.settings-help-link {
    background: none;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    color: var(--color-text);
    padding: 0.4rem 0.75rem;
    font-size: 0.85rem;
    font-family: inherit;
    cursor: pointer;
    transition: background 0.15s ease, border-color 0.15s ease;
}

.settings-help-link:hover {
    background: var(--color-surface-hover);
    border-color: var(--color-text-muted);
}

.settings-toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    user-select: none;
}

.settings-toggle input {
    display: none;
}

.settings-toggle-slider {
    position: relative;
    width: 36px;
    height: 20px;
    background: var(--color-border);
    border-radius: 10px;
    transition: background 0.2s ease;
}

.settings-toggle-slider::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 16px;
    height: 16px;
    background: var(--color-text-muted);
    border-radius: 50%;
    transition: transform 0.2s ease, background 0.2s ease;
}

.settings-toggle input:checked + .settings-toggle-slider {
    background: var(--color-accent);
}

.settings-toggle input:checked + .settings-toggle-slider::after {
    transform: translateX(16px);
    background: #fff;
}

.settings-toggle input:disabled + .settings-toggle-slider {
    opacity: 0.4;
    cursor: not-allowed;
}

.settings-toggle:has(input:disabled) {
    cursor: default;
}

.settings-toggle-text {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.settings-toggle-disabled {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.settings-toggle-note {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.settings-danger-title {
    font-size: 1rem;
    font-weight: 600;
    color: #ef5350;
    margin-bottom: 0.75rem;
}

.settings-danger-box {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
    padding: 1rem;
    border: 1px solid rgba(239, 83, 80, 0.4);
    border-radius: var(--radius);
}

.settings-danger-info h4 {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.settings-danger-info p {
    color: var(--color-text-muted);
    font-size: 0.8rem;
    line-height: 1.5;
}

.settings-danger-btn {
    flex-shrink: 0;
    padding: 0.4rem 0.75rem;
    background: none;
    border: 1px solid rgba(239, 83, 80, 0.6);
    border-radius: var(--radius);
    color: #ef5350;
    font-size: 0.85rem;
    font-family: inherit;
    cursor: pointer;
    white-space: nowrap;
    transition: background 0.15s ease, border-color 0.15s ease;
}

.settings-danger-btn:hover {
    background: rgba(239, 83, 80, 0.1);
    border-color: #ef5350;
}

.settings-danger-btn:disabled {
    opacity: 0.6;
    cursor: default;
}

@media (max-width: 640px) {
    .settings-page {
        flex-direction: column;
        gap: 1rem;
    }

    .settings-sidebar {
        width: 100%;
        position: static;
    }

    .settings-nav {
        display: flex;
        gap: 0.25rem;
    }

    .settings-danger-box {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
}

/* Utility */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}