/* ============================================
   KAITC Research Project — Stylesheet
   Academic rigor meets startup energy
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Source+Serif+4:opsz,wght@8..60,300;8..60,400;8..60,600;8..60,700&family=DM+Sans:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
    --navy: #1a2332;
    --navy-light: #243044;
    --slate: #3d4f5f;
    --blue: #2563eb;
    --blue-soft: #3b82f6;
    --blue-wash: #eff6ff;
    --gold: #c49a2a;
    --gold-light: #f5ecd4;
    --green: #16803c;
    --green-wash: #f0fdf4;
    --red-soft: #dc2626;
    --gray-50: #f8f9fb;
    --gray-100: #f1f3f5;
    --gray-200: #e2e5e9;
    --gray-300: #cdd1d6;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --white: #ffffff;
    --font-serif: 'Source Serif 4', Georgia, serif;
    --font-sans: 'DM Sans', -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 30px rgba(0,0,0,0.1);
    --radius: 8px;
    --radius-lg: 12px;
}

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

body {
    font-family: var(--font-sans);
    color: var(--gray-800);
    background: var(--gray-50);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* ---- Top Bar ---- */
.topbar {
    background: var(--navy);
    color: var(--white);
    padding: 10px 0;
    font-size: 0.78rem;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    font-weight: 500;
}
.topbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.topbar a { color: var(--gold); text-decoration: none; }
.topbar a:hover { text-decoration: underline; }

/* ---- Navigation ---- */
.site-nav {
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}
.site-nav .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 24px;
    height: 64px;
}
.site-logo {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--navy);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
}
.site-logo .logo-mark {
    width: 32px;
    height: 32px;
    background: var(--blue);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 700;
}
.nav-links {
    display: flex;
    gap: 4px;
    list-style: none;
}
.nav-links a {
    text-decoration: none;
    color: var(--gray-600);
    padding: 8px 16px;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.15s;
}
.nav-links a:hover,
.nav-links a.active {
    color: var(--blue);
    background: var(--blue-wash);
}

/* ---- Container ---- */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ---- Hero ---- */
.hero {
    background: linear-gradient(135deg, var(--navy) 0%, var(--navy-light) 60%, var(--slate) 100%);
    color: var(--white);
    padding: 64px 0 56px;
    position: relative;
    overflow: hidden;
}
.hero::after {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 500px;
    height: 500px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(37,99,235,0.15) 0%, transparent 70%);
    pointer-events: none;
}
.hero h1 {
    font-family: var(--font-serif);
    font-size: 2.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 16px;
    max-width: 720px;
}
.hero .subtitle {
    font-size: 1.1rem;
    color: rgba(255,255,255,0.7);
    max-width: 640px;
    line-height: 1.7;
    margin-bottom: 32px;
}
.hero .cta-row {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

/* ---- Buttons ---- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 22px;
    border-radius: 6px;
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 600;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all 0.15s;
}
.btn-primary {
    background: var(--blue);
    color: white;
}
.btn-primary:hover { background: #1d4ed8; }
.btn-outline {
    background: transparent;
    color: white;
    border: 1px solid rgba(255,255,255,0.3);
}
.btn-outline:hover {
    background: rgba(255,255,255,0.1);
    border-color: rgba(255,255,255,0.5);
}
.btn-gold {
    background: var(--gold);
    color: white;
}
.btn-gold:hover { background: #b08a22; }
.btn-sm {
    padding: 6px 14px;
    font-size: 0.82rem;
}

/* ---- Stat Cards ---- */
.stats-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin: -32px 0 40px;
    position: relative;
    z-index: 10;
}
.stat-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--gray-100);
}
.stat-card .stat-label {
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--gray-500);
    font-weight: 600;
    margin-bottom: 8px;
}
.stat-card .stat-value {
    font-family: var(--font-mono);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--navy);
    line-height: 1.2;
}
.stat-card .stat-detail {
    font-size: 0.82rem;
    color: var(--gray-400);
    margin-top: 4px;
}

/* ---- Sections ---- */
.section {
    padding: 48px 0;
}
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 24px;
    flex-wrap: wrap;
    gap: 12px;
}
.section-title {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--navy);
}
.section-subtitle {
    font-size: 0.9rem;
    color: var(--gray-500);
}

/* ---- Cards / Panels ---- */
.panel {
    background: var(--white);
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-200);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}
.panel-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--gray-100);
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--navy);
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.panel-body { padding: 24px; }

.two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

/* ---- Tables ---- */
.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.88rem;
}
.data-table th {
    text-align: left;
    padding: 10px 16px;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--gray-500);
    font-weight: 600;
    background: var(--gray-50);
    border-bottom: 1px solid var(--gray-200);
}
.data-table td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--gray-100);
    color: var(--gray-700);
}
.data-table tr:last-child td { border-bottom: none; }
.data-table tr:hover td { background: var(--gray-50); }
.data-table .mono {
    font-family: var(--font-mono);
    font-size: 0.84rem;
}
.data-table .text-right { text-align: right; }

/* ---- Bar chart (CSS-only) ---- */
.bar-row {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 10px;
    font-size: 0.85rem;
}
.bar-label {
    width: 120px;
    flex-shrink: 0;
    text-align: right;
    color: var(--gray-600);
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.bar-track {
    flex: 1;
    height: 28px;
    background: var(--gray-100);
    border-radius: 4px;
    position: relative;
    overflow: hidden;
}
.bar-fill {
    height: 100%;
    background: var(--blue);
    border-radius: 4px;
    transition: width 0.6s ease;
    min-width: 2px;
}
.bar-fill.gold { background: var(--gold); }
.bar-value {
    width: 80px;
    flex-shrink: 0;
    font-family: var(--font-mono);
    font-size: 0.82rem;
    color: var(--gray-700);
}

/* ---- Filters ---- */
.filter-bar {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 24px;
    align-items: center;
}
.filter-bar select,
.filter-bar input[type="text"] {
    padding: 8px 14px;
    border: 1px solid var(--gray-300);
    border-radius: 6px;
    font-family: var(--font-sans);
    font-size: 0.88rem;
    background: var(--white);
    color: var(--gray-700);
    min-width: 160px;
}
.filter-bar select:focus,
.filter-bar input:focus {
    outline: none;
    border-color: var(--blue);
    box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
}

/* ---- Directory Grid ---- */
.company-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 16px;
}
.company-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    padding: 20px;
    text-decoration: none;
    color: inherit;
    transition: all 0.15s;
    display: block;
}
.company-card:hover {
    border-color: var(--blue-soft);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}
.company-card h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--navy);
    margin-bottom: 8px;
}
.company-meta {
    display: flex;
    gap: 16px;
    font-size: 0.82rem;
    color: var(--gray-500);
    flex-wrap: wrap;
}
.company-meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}
.company-card .card-stats {
    display: flex;
    gap: 20px;
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--gray-100);
    font-size: 0.82rem;
}
.card-stats .cs-label {
    color: var(--gray-400);
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}
.card-stats .cs-value {
    font-family: var(--font-mono);
    font-weight: 600;
    color: var(--navy);
    font-size: 0.9rem;
}

/* ---- Status Badges ---- */
.status-badge {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--badge-color);
    background: color-mix(in srgb, var(--badge-color) 12%, transparent);
    text-transform: capitalize;
}

/* ---- Company Detail ---- */
.detail-header {
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    padding: 32px 0;
}
.detail-header h1 {
    font-family: var(--font-serif);
    font-size: 2rem;
    color: var(--navy);
    margin-bottom: 8px;
}
.detail-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 24px;
}
.detail-field {
    margin-bottom: 16px;
}
.detail-field .df-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--gray-400);
    font-weight: 600;
    margin-bottom: 4px;
}
.detail-field .df-value {
    font-size: 0.95rem;
    color: var(--gray-700);
}

/* ---- Contribute Form ---- */
.form-group {
    margin-bottom: 20px;
}
.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 6px;
}
.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--gray-300);
    border-radius: 6px;
    font-family: var(--font-sans);
    font-size: 0.9rem;
    color: var(--gray-700);
    background: var(--white);
}
.form-group textarea { resize: vertical; min-height: 80px; }
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--blue);
    box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
}
.form-hint {
    font-size: 0.78rem;
    color: var(--gray-400);
    margin-top: 4px;
}

.alert {
    padding: 14px 20px;
    border-radius: var(--radius);
    margin-bottom: 20px;
    font-size: 0.9rem;
}
.alert-success {
    background: var(--green-wash);
    color: var(--green);
    border: 1px solid #bbf7d0;
}
.alert-error {
    background: #fef2f2;
    color: var(--red-soft);
    border: 1px solid #fecaca;
}

/* ---- Methodology Note ---- */
.method-note {
    background: var(--gold-light);
    border-left: 4px solid var(--gold);
    border-radius: 0 var(--radius) var(--radius) 0;
    padding: 20px 24px;
    margin: 24px 0;
    font-size: 0.9rem;
    color: var(--gray-700);
    line-height: 1.7;
}
.method-note strong {
    color: var(--navy);
}

/* ---- Footer ---- */
.site-footer {
    background: var(--navy);
    color: rgba(255,255,255,0.5);
    padding: 40px 0;
    margin-top: 60px;
    font-size: 0.82rem;
}
.site-footer a {
    color: var(--gold);
    text-decoration: none;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 40px;
}
.footer-grid h4 {
    color: rgba(255,255,255,0.8);
    font-size: 0.85rem;
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
    .hero h1 { font-size: 1.75rem; }
    .stats-row { grid-template-columns: repeat(2, 1fr); }
    .two-col { grid-template-columns: 1fr; }
    .detail-grid { grid-template-columns: 1fr; }
    .company-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
    .nav-links { display: none; }
}