/* ============================================
   CSS Custom Properties (Design Tokens)
   ============================================ */
:root {
    /* Colors - Light */
    --color-bg: #ffffff;
    --color-surface: #f9fafb;
    --color-text-primary: #111827;
    --color-text-secondary: #6b7280;
    --color-border: #e5e7eb;

    /* Accents */
    --color-accent: #3b82f6;
    --color-cta: #ffdd00;
    --color-cta-hover: #fcd34d;

    /* Status */
    --color-success: #10b981;
    --color-error: #ef4444;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2.5rem;

    /* Typography */
    --font-heading: 'Outfit', -apple-system, system-ui, sans-serif;
    --font-body: 'Inter', -apple-system, system-ui, sans-serif;

    --font-size-xs: 0.75rem;
    --font-size-sm: 0.8125rem;
    --font-size-base: 0.9375rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.5rem;

    /* Radius */
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
}

/* ============================================
   Dark Mode
   ============================================ */
[data-theme="dark"] {
    --color-bg: #0d1117;
    --color-surface: #18181b;
    --color-text-primary: #e4e4e7;
    --color-text-secondary: #a1a1aa;
    --color-border: #27272a;
    --color-accent: #60a5fa;
    --color-cta: #facc15;
    --color-cta-hover: #fde047;
    --color-error: #f87171;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
}

/* ============================================
   Base Styles
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    overflow-x: clip;
}

body {
    font-family: var(--font-body);
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    overflow-x: clip;
    transition: background-color 0.3s ease, color 0.3s ease;
}

::selection {
    background: var(--color-accent);
    color: #fff;
}

a {
    transition: color 0.15s ease;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ============================================
   Header
   ============================================ */
header {
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-md) 0;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

header h1 {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: -0.02em;
}

.header-left {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.header-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    color: inherit;
}

.header-logo {
    width: 28px;
    height: 28px;
    border-radius: 6px;
    object-fit: cover;
}

.tagline {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
}

/* Theme Toggle */
.theme-toggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    padding: 0.375rem 0.75rem;
    cursor: pointer;
    font-size: 0.75rem;
    font-family: var(--font-body);
    color: var(--color-text-secondary);
    transition: all 0.2s ease;
}

.theme-toggle:hover {
    border-color: var(--color-text-secondary);
    color: var(--color-text-primary);
}

.theme-toggle .icon {
    display: flex;
    align-items: center;
    line-height: 1;
}

/* ============================================
   App Layout
   ============================================ */
.app-layout {
    display: flex;
    gap: var(--spacing-xl);
    padding-top: var(--spacing-xl);
    padding-bottom: var(--spacing-xl);
}

/* Sidebar */
.sidebar {
    width: 240px;
    flex-shrink: 0;
}

.sidebar-section h2 {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

.filter-group {
    margin-bottom: var(--spacing-md);
}

.filter-group label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.search-input,
.filter-select {
    width: 100%;
    border: 1px solid var(--color-border);
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-family: var(--font-body);
    transition: border-color 0.15s, background-color 0.3s ease, color 0.3s ease;
    background-color: var(--color-bg);
    color: var(--color-text-primary);
}

.search-input:focus,
.filter-select:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.15);
}

.sidebar-footer {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    transition: border-color 0.3s ease;
}

/* Main Content */
.main-content {
    flex-grow: 1;
    min-width: 0;
}

/* ============================================
   Components
   ============================================ */

/* Generic Card */
.glass-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: border-color 0.15s, background-color 0.3s ease, box-shadow 0.3s ease;
}

/* Latest Release Card */
.latest-section {
    margin-bottom: var(--spacing-xl);
}

.latest-card {
    padding: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    position: relative;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-bg);
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

.latest-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 16px -4px rgba(0, 0, 0, 0.08), 0 4px 8px -2px rgba(0, 0, 0, 0.04);
    border-color: var(--color-accent);
}

[data-theme="dark"] .latest-card:hover {
    box-shadow: 0 8px 16px -4px rgba(0, 0, 0, 0.5), 0 4px 8px -2px rgba(0, 0, 0, 0.3);
}

.latest-card>* {
    margin-bottom: var(--spacing-lg);
}

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

/* Badge */
.latest-badge {
    align-self: flex-start;
    background: #FFFAE5;
    border: 1px solid #FCD34D;
    color: #92400E;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
}

[data-theme="dark"] .latest-badge {
    background: rgba(250, 204, 21, 0.12);
    border-color: rgba(250, 204, 21, 0.3);
    color: #fbbf24;
}

/* Version Header */
.latest-card h2 {
    font-size: 2rem;
    font-weight: 800;
    color: var(--color-text-primary);
    line-height: 1.2;
    margin: 0;
}

/* Details */
.version-details {
    display: flex;
    width: 100%;
    justify-content: space-between;
    align-items: flex-end;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
    transition: border-color 0.3s ease;
}

.details-group {
    display: flex;
    gap: var(--spacing-xl);
}

.detail-item {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.detail-label {
    font-size: 0.7rem;
    text-transform: uppercase;
    font-weight: 600;
    letter-spacing: 0.05em;
    color: var(--color-text-secondary);
}

.detail-value {
    font-weight: 700;
    font-size: 1rem;
    color: var(--color-text-primary);
}

.download-buttons {
    display: flex;
    gap: var(--spacing-sm);
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 600;
    padding: 0.625rem 1.25rem;
    border-radius: var(--radius-md);
    transition: all 0.2s ease;
    white-space: nowrap;
}

.cta-btn {
    background-color: var(--color-cta);
    color: #111827;
    box-shadow: var(--shadow-sm);
}

.cta-btn:hover {
    background-color: var(--color-cta-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

/* ============================================
   Versions Accordion
   ============================================ */
.versions-section h2 {
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.versions-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    content-visibility: auto;
    contain-intrinsic-size: 1px 1000px; /* Estimate height to prevent scrollbar jumping */
}

.version-card {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: border-color 0.2s ease, transform 0.15s ease;
}

.version-card.expanded {
    border-color: rgba(59, 130, 246, 0.35);
}

.version-card:hover {
    transform: translateY(-1px);
}

.version-card.deep-linked-card {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 1px rgba(59, 130, 246, 0.35);
}

.version-card-header {
    width: 100%;
    padding: 0.85rem 1rem;
    background: transparent;
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    color: inherit;
}

.version-card-header:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: -2px;
    border-radius: var(--radius-md);
}

.version-card-main {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.version-card-meta {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--color-text-secondary);
    font-size: 0.8125rem;
}

.version-accordion-icon {
    width: 1.25rem;
    text-align: center;
    font-size: 1rem;
    line-height: 1;
}

.version-card-body {
    border-top: 1px solid var(--color-border);
    padding: 0.75rem 1rem;
}

.version-card-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    padding: 0.4rem 0;
}

.version-card-row+.version-card-row {
    border-top: 1px dashed var(--color-border);
}

.version-number {
    font-weight: 600;
    color: var(--color-accent);
}

.version-link {
    text-decoration: none;
}

.version-link:hover .version-number {
    text-decoration: underline;
}

.major-badge {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
}

.locale-badge {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    min-width: 7.25rem;
}

.download-buttons-cell {
    display: flex;
    gap: 0.35rem;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.version-card-empty {
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
    padding: 0.35rem 0;
}

/* Responsive label switching */
.date-short,
.label-short {
    display: none;
}

.date-full,
.label-full {
    display: inline;
}

.table-download-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    color: var(--color-text-secondary);
    text-decoration: none;
    padding: 0.25rem 0.5rem;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 500;
    transition: all 0.15s ease;
}

.table-download-btn:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    background: rgba(59, 130, 246, 0.05);
}

[data-theme="dark"] .table-download-btn:hover {
    background: rgba(96, 165, 250, 0.1);
}

/* ============================================
   Loading & Feedback
   ============================================ */
.loading-state,
.error-state {
    padding: var(--spacing-xl);
    text-align: center;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.loader {
    width: 24px;
    height: 24px;
    border: 2px solid var(--color-border);
    border-top-color: var(--color-text-secondary);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    margin: 0 auto 12px;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(8px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================
   Footer
   ============================================ */
footer {
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-xl) 0;
    text-align: center;
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    transition: border-color 0.3s ease;
}

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

footer a:hover {
    text-decoration: underline;
}

.footer-version {
    margin-top: 0.5rem;
    font-size: 0.625rem;
    opacity: 0.7;
}

/* ============================================
   Contributors
   ============================================ */
.contributors-list {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: var(--spacing-lg);
}

.contributor-bubble {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    overflow: hidden;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    border: 2px solid var(--color-border);
}

.contributor-bubble:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-md);
    border-color: var(--color-accent);
    z-index: 10;
}

.contributor-bubble img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-sm);
    }

    .app-layout {
        flex-direction: column;
        gap: var(--spacing-md);
        padding-top: var(--spacing-md);
    }

    .sidebar {
        width: 100%;
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
        gap: var(--spacing-sm);
        background: var(--color-surface);
        padding: var(--spacing-sm) var(--spacing-md);
        border-radius: var(--radius-md);
        border: 1px solid var(--color-border);
        transition: background-color 0.3s ease, border-color 0.3s ease;
    }

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

    .sidebar-section h2 {
        display: none;
    }

    .filter-group {
        margin-bottom: var(--spacing-sm);
    }

    .sidebar-footer {
        display: none;
    }

    .latest-card {
        padding: var(--spacing-md);
    }

    .version-details {
        gap: var(--spacing-md);
        flex-wrap: wrap;
    }

    .version-card-header {
        padding: 0.75rem;
        align-items: flex-start;
        gap: 0.5rem;
    }

    .version-card-main,
    .version-card-meta {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.15rem;
    }

    .version-card-body {
        padding: 0.65rem 0.75rem;
    }

    .version-card-row {
        flex-direction: column;
        align-items: flex-start;
    }

    .download-buttons-cell {
        justify-content: flex-start;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1rem;
    }

    .tagline {
        display: none;
    }

    .latest-card h2 {
        font-size: 1.25rem;
    }

    .download-buttons {
        flex-direction: column;
    }

    .download-btn {
        width: 100%;
        justify-content: center;
        padding: 0.625rem;
    }

    /* Switch to abbreviated labels */
    .date-full,
    .label-full {
        display: none;
    }

    .date-short,
    .label-short {
        display: inline;
    }

    .version-card-header {
        padding: 0.65rem;
    }

    .version-card-body {
        padding: 0.5rem 0.65rem;
    }

    .locale-badge {
        min-width: auto;
    }
}