/* Theme Variables */
:root {
    --bg-page: #f5f5f5;
    --bg-surface: white;
    --bg-surface-hover: #f9fafb;
    --bg-surface-alt: #f3f4f6;
    --bg-input: white;

    --text-primary: #333;
    --text-heading: #1e293b;
    --text-heading-secondary: #334155;
    --text-secondary: #374151;
    --text-muted: #6b7280;
    --text-link: #2563eb;

    --border-default: #d1d5db;
    --border-light: #e5e7eb;

    --shadow: 0 1px 3px rgba(0,0,0,0.08);

    --navbar-bg: #1e293b;
    --navbar-text: white;
    --navbar-link: #cbd5e1;
    --navbar-link-hover: white;
    --navbar-muted: #94a3b8;
    --navbar-border: #475569;

    --btn-bg: white;
    --btn-text: #374151;
    --btn-border: #d1d5db;
    --btn-hover-bg: #f3f4f6;
    --btn-primary-bg: #2563eb;
    --btn-primary-hover: #1d4ed8;
    --btn-danger-text: #dc2626;
    --btn-danger-border: #fca5a5;
    --btn-danger-hover-bg: #fef2f2;

    --input-border: #d1d5db;
    --input-focus-border: #2563eb;
    --input-focus-shadow: rgba(37,99,235,0.1);

    --alert-error-bg: #fef2f2;
    --alert-error-text: #dc2626;
    --alert-error-border: #fca5a5;
    --alert-success-bg: #f0fdf4;
    --alert-success-text: #16a34a;
    --alert-success-border: #86efac;
    --alert-warning-bg: #fffbeb;
    --alert-warning-text: #d97706;
    --alert-warning-border: #fcd34d;
    --alert-info-bg: #eff6ff;
    --alert-info-text: #2563eb;
    --alert-info-border: #93c5fd;

    --badge-active-bg: #dcfce7;
    --badge-active-text: #16a34a;
    --badge-inactive-bg: #f3f4f6;
    --badge-inactive-text: #6b7280;
    --badge-pending-bg: #fef3c7;
    --badge-pending-text: #d97706;
    --badge-expired-bg: #fef2f2;
    --badge-expired-text: #dc2626;

    --progress-bg: #e5e7eb;
    --progress-fill: #2563eb;

    --star-inactive: #d1d5db;
    --star-active: #f59e0b;
    --star-hover: #fbbf24;

    --copy-input-bg: #f9fafb;
}

[data-theme="dark"] {
    --bg-page: #0f172a;
    --bg-surface: #1e293b;
    --bg-surface-hover: #334155;
    --bg-surface-alt: #334155;
    --bg-input: #0f172a;

    --text-primary: #e2e8f0;
    --text-heading: #f1f5f9;
    --text-heading-secondary: #e2e8f0;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --text-link: #60a5fa;

    --border-default: #475569;
    --border-light: #334155;

    --shadow: 0 1px 3px rgba(0,0,0,0.3);

    --navbar-bg: #020617;
    --navbar-link: #94a3b8;
    --navbar-link-hover: #e2e8f0;
    --navbar-muted: #64748b;
    --navbar-border: #334155;

    --btn-bg: #334155;
    --btn-text: #e2e8f0;
    --btn-border: #475569;
    --btn-hover-bg: #475569;
    --btn-primary-bg: #2563eb;
    --btn-primary-hover: #3b82f6;
    --btn-danger-text: #f87171;
    --btn-danger-border: #7f1d1d;
    --btn-danger-hover-bg: #1c1917;

    --input-border: #475569;
    --input-focus-border: #60a5fa;
    --input-focus-shadow: rgba(96,165,250,0.15);

    --alert-error-bg: #1c1917;
    --alert-error-text: #f87171;
    --alert-error-border: #7f1d1d;
    --alert-success-bg: #052e16;
    --alert-success-text: #4ade80;
    --alert-success-border: #166534;
    --alert-warning-bg: #451a03;
    --alert-warning-text: #fbbf24;
    --alert-warning-border: #92400e;
    --alert-info-bg: #172554;
    --alert-info-text: #60a5fa;
    --alert-info-border: #1e3a5f;

    --badge-active-bg: #052e16;
    --badge-active-text: #4ade80;
    --badge-inactive-bg: #334155;
    --badge-inactive-text: #94a3b8;
    --badge-pending-bg: #451a03;
    --badge-pending-text: #fbbf24;
    --badge-expired-bg: #1c1917;
    --badge-expired-text: #f87171;

    --progress-bg: #334155;
    --progress-fill: #3b82f6;

    --star-inactive: #475569;
    --star-active: #f59e0b;
    --star-hover: #fbbf24;

    --copy-input-bg: #0f172a;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-page);
}

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

a:hover {
    text-decoration: underline;
}

/* Navbar */
.navbar {
    background: var(--navbar-bg);
    color: var(--navbar-text);
    padding: 0.75rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand a {
    color: var(--navbar-text);
    font-weight: 700;
    font-size: 1.1rem;
}

.nav-brand a:hover {
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 1.25rem;
    align-items: center;
}

.nav-links a {
    color: var(--navbar-link);
    font-size: 0.9rem;
}

.nav-links a:hover {
    color: var(--navbar-link-hover);
    text-decoration: none;
}

.nav-user {
    color: var(--navbar-muted);
    font-size: 0.85rem;
    padding-left: 0.75rem;
    border-left: 1px solid var(--navbar-border);
}

/* Theme Toggle */
.theme-toggle {
    background: none;
    border: 1px solid var(--navbar-border);
    border-radius: 6px;
    color: var(--navbar-link);
    cursor: pointer;
    font-size: 1.1rem;
    padding: 0.2rem 0.5rem;
    line-height: 1;
    transition: color 0.15s, border-color 0.15s;
}

.theme-toggle:hover {
    color: var(--navbar-link-hover);
    border-color: var(--navbar-link-hover);
}

/* Container */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

/* Typography */
h1 {
    font-size: 1.75rem;
    margin-bottom: 1.5rem;
    color: var(--text-heading);
}

h2 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-heading-secondary);
}

/* Sections */
.section {
    background: var(--bg-surface);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    border: 1px solid var(--btn-border);
    border-radius: 6px;
    background: var(--btn-bg);
    color: var(--btn-text);
    font-size: 0.875rem;
    cursor: pointer;
    text-decoration: none;
    transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.btn:hover {
    background: var(--btn-hover-bg);
    text-decoration: none;
}

.btn-primary {
    background: var(--btn-primary-bg);
    color: white;
    border-color: var(--btn-primary-bg);
}

.btn-primary:hover {
    background: var(--btn-primary-hover);
}

.btn-danger {
    color: var(--btn-danger-text);
    border-color: var(--btn-danger-border);
}

.btn-danger:hover {
    background: var(--btn-danger-hover-bg);
}

.btn-sm {
    padding: 0.25rem 0.5rem;
    font-size: 0.8rem;
}

.btn-large {
    padding: 0.75rem 2rem;
    font-size: 1.1rem;
}

.button-row {
    display: flex;
    gap: 0.75rem;
    align-items: center;
    margin-top: 1rem;
}

/* Forms */
.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.25rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.form-group input[type="text"],
.form-group input[type="password"],
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--input-border);
    border-radius: 6px;
    font-size: 0.9rem;
    font-family: inherit;
    background: var(--bg-input);
    color: var(--text-primary);
}

.form-group textarea {
    resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--input-focus-border);
    box-shadow: 0 0 0 3px var(--input-focus-shadow);
}

.auth-form {
    max-width: 400px;
    margin: 2rem auto;
    background: var(--bg-surface);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

/* Alerts */
.alert {
    padding: 0.75rem 1rem;
    border-radius: 6px;
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

.alert-error {
    background: var(--alert-error-bg);
    color: var(--alert-error-text);
    border: 1px solid var(--alert-error-border);
}

.alert-success {
    background: var(--alert-success-bg);
    color: var(--alert-success-text);
    border: 1px solid var(--alert-success-border);
}

.alert-warning {
    background: var(--alert-warning-bg);
    color: var(--alert-warning-text);
    border: 1px solid var(--alert-warning-border);
}

.alert-info {
    background: var(--alert-info-bg);
    color: var(--alert-info-text);
    border: 1px solid var(--alert-info-border);
}

/* Generated Description */
.generated-description {
    background: var(--bg-surface-alt);
    border: 1px solid var(--border-light);
    border-radius: 6px;
    padding: 0.75rem 1rem;
    margin-bottom: 1rem;
}

.generated-description label {
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
    display: block;
}

.generated-description p {
    margin: 0;
    color: var(--text-primary);
    font-size: 0.95rem;
}

/* Tables */
.table {
    width: 100%;
    border-collapse: collapse;
}

.table th,
.table td {
    padding: 0.6rem 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border-light);
    font-size: 0.9rem;
}

.table th {
    font-weight: 600;
    color: var(--text-muted);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.table tbody tr:hover {
    background: var(--bg-surface-hover);
}

/* Badges */
.badge {
    display: inline-block;
    padding: 0.15rem 0.5rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-active, .badge-used {
    background: var(--badge-active-bg);
    color: var(--badge-active-text);
}

.badge-inactive {
    background: var(--badge-inactive-bg);
    color: var(--badge-inactive-text);
}

.badge-pending {
    background: var(--badge-pending-bg);
    color: var(--badge-pending-text);
}

.badge-expired, .badge-suspended {
    background: var(--badge-expired-bg);
    color: var(--badge-expired-text);
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.stat-card {
    background: var(--bg-surface);
    border-radius: 8px;
    padding: 1.25rem;
    text-align: center;
    box-shadow: var(--shadow);
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-heading);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

/* Image Grid */
.image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1rem;
}

.image-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-light);
    border-radius: 8px;
    overflow: hidden;
}

.image-card img {
    width: 100%;
    height: 160px;
    object-fit: cover;
    display: block;
}

.image-card-info {
    padding: 0.5rem 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
}

.image-name {
    font-size: 0.8rem;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.annotation-count {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.image-card-description {
    padding: 0 0.75rem;
    margin: 0 0 0.25rem;
    font-size: 0.78rem;
    color: var(--text-secondary);
    line-height: 1.3;
}

.image-card-description.no-description {
    color: var(--text-muted);
    font-style: italic;
}

.image-delete-form {
    padding: 0 0.75rem 0.5rem;
}

/* Collection Meta */
.collection-meta {
    display: flex;
    gap: 1rem;
    align-items: center;
    margin-bottom: 0.5rem;
}

/* Progress Bar */
.progress-section {
    background: var(--bg-surface);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
}

.progress-section.compact {
    padding: 0.75rem 1rem;
    margin-bottom: 1rem;
}

.progress-bar-container {
    width: 100%;
    height: 12px;
    background: var(--progress-bg);
    border-radius: 6px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: var(--progress-fill);
    border-radius: 6px;
    transition: width 0.3s ease;
    min-width: 0;
}

.progress-text {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
}

.compact .progress-text {
    margin-top: 0.25rem;
    font-size: 0.8rem;
}

/* Collection Context */
.collection-context {
    margin-bottom: 0.75rem;
}

.collection-context-name {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-heading-secondary);
    margin-bottom: 0.15rem;
}

.collection-context-description {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.4;
}

/* Annotation Page */
.annotate-page {
    max-width: 900px;
    margin: 0 auto;
}

.annotate-image-container {
    background: var(--bg-surface);
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 1rem;
    text-align: center;
    box-shadow: var(--shadow);
}

.annotate-image {
    max-width: 100%;
    max-height: 60vh;
    border-radius: 4px;
}

.annotate-form {
    background: var(--bg-surface);
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

/* Star Rating */
.star-rating {
    display: inline-flex;
    gap: 0.25rem;
    cursor: pointer;
    font-size: 2rem;
    user-select: none;
}

.star-rating .star {
    color: var(--star-inactive);
    transition: color 0.15s;
}

.star-rating .star.active {
    color: var(--star-active);
}

.star-rating .star:hover,
.star-rating .star.hover {
    color: var(--star-hover);
}

/* Copy input */
.copy-input {
    font-size: 0.8rem;
    padding: 0.25rem 0.5rem;
    border: 1px solid var(--input-border);
    border-radius: 4px;
    width: 280px;
    background: var(--copy-input-bg);
    color: var(--text-primary);
    cursor: pointer;
}

/* Review page */
.annotation-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-light);
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 0.75rem;
}

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

.annotation-card-header .annotator-name {
    font-weight: 600;
}

.annotation-card-header .score-display {
    color: var(--star-active);
    font-size: 1.1rem;
}

.annotation-field {
    margin-bottom: 0.5rem;
}

.annotation-field-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.annotation-field-value {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Theme transition */
body,
/* Markdown rendered summary */
.markdown-body {
    line-height: 1.6;
}
.markdown-body h1, .markdown-body h2, .markdown-body h3 {
    margin-top: 1em;
    margin-bottom: 0.5em;
    color: var(--text-heading);
}
.markdown-body p {
    margin-bottom: 0.75em;
}
.markdown-body ul, .markdown-body ol {
    margin-bottom: 0.75em;
    padding-left: 1.5em;
}
.markdown-body li {
    margin-bottom: 0.25em;
}
.markdown-body code {
    background: var(--bg-surface-alt);
    padding: 0.15em 0.35em;
    border-radius: 3px;
    font-size: 0.9em;
}
.markdown-body pre {
    background: var(--bg-surface-alt);
    padding: 0.75em 1em;
    border-radius: 4px;
    overflow-x: auto;
    margin-bottom: 0.75em;
}
.markdown-body blockquote {
    border-left: 3px solid var(--border-default);
    margin: 0.75em 0;
    padding: 0.25em 1em;
    color: var(--text-muted);
}
.markdown-body strong {
    font-weight: 600;
}
.markdown-body hr {
    border: none;
    border-top: 1px solid var(--border-light);
    margin: 1em 0;
}

.section,
.stat-card,
.progress-section,
.auth-form,
.annotate-image-container,
.annotate-form,
.annotation-card,
.image-card,
.navbar,
.btn,
.form-group input,
.form-group textarea {
    transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}