/* ======================================================
   LLM Model Updates Tracker — Cyberpunk / Tech Style
   ====================================================== */

/* --- CSS Variables (Dark Theme - Default) --- */
:root {
    --bg-primary: #06060e;
    --bg-secondary: #0c0c18;
    --bg-card: #10101e;
    --bg-card-hover: #161628;
    --border-color: rgba(100, 100, 255, 0.08);
    --border-glow: rgba(0, 212, 255, 0.15);
    --text-primary: #e4e4f0;
    --text-secondary: #8888a8;
    --text-muted: #55556a;
    --accent-blue: #00d4ff;
    --accent-purple: #7b61ff;
    --accent-gradient: linear-gradient(135deg, #00d4ff 0%, #7b61ff 100%);
    --open-source-color: #00e676;
    --closed-source-color: #78909c;
    --shadow-glow: 0 0 20px rgba(0, 212, 255, 0.08);
    --shadow-card: 0 2px 16px rgba(0, 0, 0, 0.3);
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --radius: 12px;
    --radius-sm: 8px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --container-width: 1100px;
    --grid-dot-color: rgba(100, 100, 255, 0.04);
    --timeline-line-color: rgba(0, 212, 255, 0.12);
}

/* --- Light Theme --- */
[data-theme="light"] {
    --bg-primary: #f4f5f9;
    --bg-secondary: #eaecf2;
    --bg-card: #ffffff;
    --bg-card-hover: #f8f8ff;
    --border-color: rgba(100, 100, 200, 0.12);
    --border-glow: rgba(123, 97, 255, 0.18);
    --text-primary: #1a1a2e;
    --text-secondary: #5a5a7a;
    --text-muted: #8a8aa0;
    --accent-blue: #0099cc;
    --accent-purple: #6248e0;
    --shadow-glow: 0 0 20px rgba(123, 97, 255, 0.08);
    --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.06);
    --grid-dot-color: rgba(100, 100, 200, 0.05);
    --timeline-line-color: rgba(123, 97, 255, 0.15);
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    position: relative;
    transition: background var(--transition), color var(--transition);
}

/* --- Dot-grid background --- */
.bg-grid {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    background-image:
        radial-gradient(circle, var(--grid-dot-color) 1px, transparent 1px);
    background-size: 28px 28px;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
    position: relative;
    z-index: 1;
}

/* --- Header --- */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(6, 6, 14, 0.8);
    backdrop-filter: blur(16px) saturate(1.2);
    border-bottom: 1px solid var(--border-color);
    transition: background var(--transition);
}

[data-theme="light"] .header {
    background: rgba(244, 245, 249, 0.85);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

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

.logo-icon {
    font-family: var(--font-mono);
    font-size: 1.3rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-text {
    font-family: var(--font-mono);
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition);
    font-family: var(--font-mono);
    font-size: 0.78rem;
    font-weight: 600;
}

.btn-icon:hover {
    border-color: var(--accent-blue);
    color: var(--accent-blue);
    box-shadow: 0 0 12px rgba(0, 212, 255, 0.12);
}

.lang-label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.05em;
}

/* Theme toggle icons */
[data-theme="dark"] .icon-moon { display: none; }
[data-theme="light"] .icon-sun { display: none; }
[data-theme="dark"] .icon-sun { display: block; }
[data-theme="light"] .icon-moon { display: block; }

/* --- Stats Section --- */
.stats-section {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-top: 32px;
    margin-bottom: 32px;
}

.stat-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    padding: 20px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    box-shadow: var(--shadow-card);
    transition: all var(--transition);
}

.stat-card:hover {
    border-color: var(--border-glow);
    box-shadow: var(--shadow-glow);
}

.stat-number {
    font-family: var(--font-mono);
    font-size: 2rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 0.82rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

/* --- Filters Section --- */
.filters-section {
    margin-bottom: 36px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.filter-title {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* License filter buttons */
.license-filters {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.license-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 7px 16px;
    border: 1px solid var(--border-color);
    border-radius: 100px;
    background: transparent;
    color: var(--text-secondary);
    font-family: var(--font-sans);
    font-size: 0.82rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
}

.license-btn:hover {
    border-color: var(--text-muted);
    color: var(--text-primary);
}

.license-btn.active {
    background: var(--accent-gradient);
    border-color: transparent;
    color: #fff;
    box-shadow: 0 0 16px rgba(0, 212, 255, 0.2);
}

.license-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    display: inline-block;
}

.license-dot.open {
    background: var(--open-source-color);
    box-shadow: 0 0 6px var(--open-source-color);
}

.license-dot.closed {
    background: var(--closed-source-color);
}

/* Company filter buttons */
.company-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.company-btn {
    display: flex;
    align-items: center;
    gap: 7px;
    padding: 6px 14px;
    border: 1px solid var(--border-color);
    border-radius: 100px;
    background: var(--bg-card);
    color: var(--text-secondary);
    font-family: var(--font-sans);
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
}

.company-btn:hover {
    border-color: var(--text-muted);
    color: var(--text-primary);
}

.company-btn.active {
    border-color: var(--company-color, var(--accent-blue));
    color: var(--text-primary);
    box-shadow: 0 0 12px rgba(0, 212, 255, 0.1);
    background: var(--bg-card-hover);
}

.company-btn .company-icon {
    width: 18px;
    height: 18px;
    border-radius: 4px;
    object-fit: contain;
    flex-shrink: 0;
}

/* --- Timeline --- */
.timeline-section {
    padding-bottom: 60px;
}

.timeline {
    position: relative;
    padding-left: 40px;
}

/* Vertical line */
.timeline::before {
    content: '';
    position: absolute;
    left: 15px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--timeline-line-color);
    border-radius: 1px;
}

/* Date group */
.timeline-date-group {
    margin-bottom: 8px;
}

.timeline-date {
    position: relative;
    display: flex;
    align-items: center;
    padding: 12px 0 8px;
}

/* Date node dot */
.timeline-date::before {
    content: '';
    position: absolute;
    left: -31px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--bg-primary);
    border: 2px solid var(--accent-blue);
    box-shadow: 0 0 10px rgba(0, 212, 255, 0.3);
    z-index: 2;
}

.timeline-date-text {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent-blue);
    letter-spacing: 0.02em;
}

/* Model cards within a date group */
.timeline-cards {
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding-bottom: 8px;
}

.model-card {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 18px 20px;
    box-shadow: var(--shadow-card);
    transition: all var(--transition);
    overflow: hidden;
}

.model-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 3px;
    height: 100%;
    background: var(--card-accent, var(--accent-gradient));
    border-radius: 3px 0 0 3px;
    opacity: 0.6;
    transition: opacity var(--transition);
}

.model-card:hover {
    border-color: var(--border-glow);
    box-shadow: var(--shadow-glow), var(--shadow-card);
    transform: translateY(-1px);
}

.model-card:hover::before {
    opacity: 1;
}

.card-header {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 10px;
}

.card-company-icon {
    width: 28px;
    height: 28px;
    border-radius: 6px;
    object-fit: contain;
    flex-shrink: 0;
    margin-top: 2px;
}

.card-company-icon-placeholder {
    width: 28px;
    height: 28px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 700;
    color: #fff;
    flex-shrink: 0;
    margin-top: 2px;
}

.card-info {
    flex: 1;
    min-width: 0;
}

.card-company-name {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: 2px;
}

.card-model-name {
    font-family: var(--font-mono);
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    word-break: break-word;
}

.card-badges {
    display: flex;
    gap: 8px;
    align-items: center;
    flex-shrink: 0;
    margin-top: 2px;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 10px;
    border-radius: 100px;
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.03em;
    white-space: nowrap;
}

.badge-open {
    background: rgba(0, 230, 118, 0.12);
    color: var(--open-source-color);
    border: 1px solid rgba(0, 230, 118, 0.2);
}

.badge-closed {
    background: rgba(120, 144, 156, 0.1);
    color: var(--closed-source-color);
    border: 1px solid rgba(120, 144, 156, 0.15);
}

.badge-unknown {
    background: rgba(200, 200, 200, 0.08);
    color: var(--text-muted);
    border: 1px solid rgba(200, 200, 200, 0.1);
}

.card-features {
    font-size: 0.84rem;
    line-height: 1.65;
    color: var(--text-secondary);
    margin-top: 4px;
}

.card-footer {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    margin-top: 12px;
}

.blog-link {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 5px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 500;
    color: var(--accent-blue);
    text-decoration: none;
    transition: all var(--transition);
}

.blog-link:hover {
    border-color: var(--accent-blue);
    box-shadow: 0 0 10px rgba(0, 212, 255, 0.15);
}

.blog-link svg {
    width: 13px;
    height: 13px;
}

/* --- Empty State --- */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    padding: 60px 20px;
    color: var(--text-muted);
}

.empty-state svg {
    opacity: 0.3;
}

.empty-state p {
    font-size: 0.95rem;
}

/* --- Footer --- */
.footer {
    position: relative;
    z-index: 1;
    border-top: 1px solid var(--border-color);
    padding: 24px 0;
    margin-top: 20px;
}

.footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.footer p {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.github-link {
    display: flex;
    align-items: center;
    gap: 6px;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition);
}

.github-link:hover {
    color: var(--accent-blue);
}

/* --- Animations --- */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.model-card {
    animation: fadeInUp 0.4s ease-out both;
}

.timeline-date-group:nth-child(1) .model-card { animation-delay: 0s; }
.timeline-date-group:nth-child(2) .model-card { animation-delay: 0.04s; }
.timeline-date-group:nth-child(3) .model-card { animation-delay: 0.08s; }
.timeline-date-group:nth-child(4) .model-card { animation-delay: 0.12s; }
.timeline-date-group:nth-child(5) .model-card { animation-delay: 0.16s; }

/* --- Responsive --- */
@media (max-width: 768px) {
    .header-inner { height: 56px; }

    .logo-text {
        font-size: 0.82rem;
    }

    .stats-section {
        grid-template-columns: repeat(3, 1fr);
        gap: 10px;
        margin-top: 20px;
        margin-bottom: 24px;
    }

    .stat-card {
        padding: 14px 10px;
    }

    .stat-number {
        font-size: 1.4rem;
    }

    .stat-label {
        font-size: 0.7rem;
    }

    .filters-section {
        gap: 14px;
        margin-bottom: 28px;
    }

    .timeline {
        padding-left: 30px;
    }

    .timeline::before {
        left: 10px;
    }

    .timeline-date::before {
        left: -25px;
        width: 10px;
        height: 10px;
    }

    .model-card {
        padding: 14px 16px;
    }

    .card-company-icon,
    .card-company-icon-placeholder {
        width: 24px;
        height: 24px;
    }

    .card-model-name {
        font-size: 0.88rem;
    }

    .footer-inner {
        flex-direction: column;
        gap: 10px;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .logo-text {
        font-size: 0.72rem;
    }

    .card-badges {
        margin-top: 8px;
    }

    .card-header {
        flex-wrap: wrap;
    }
}

/* --- Scrollbar --- */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}