:root {
    --primary: #5bb8ff;
    --primary-dark: #1e88e5;
    --text: #16324f;
    --muted: #61788f;
    --bg: #f4f9ff;
    --white: #ffffff;
    --border: #d9e7f5;
    --shadow: 0 18px 45px rgba(16, 67, 113, 0.12);
    --radius: 20px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    color: var(--text);
    background: linear-gradient(180deg, #f7fbff 0%, #eef6ff 100%);
}
a { color: var(--primary-dark); text-decoration: none; }
.container { width: min(1180px, calc(100% - 32px)); margin: 0 auto; }
.hero {
    padding: 70px 0 40px;
    background: linear-gradient(135deg, rgba(91,184,255,0.17) 0%, rgba(255,255,255,1) 60%);
    border-bottom: 1px solid var(--border);
}
.hero-grid {
    display: grid;
    grid-template-columns: 1.35fr .85fr;
    gap: 28px;
    align-items: center;
}
.badge, .small-badge {
    display: inline-flex;
    padding: 8px 14px;
    border-radius: 999px;
    background: rgba(91,184,255,0.14);
    color: var(--primary-dark);
    font-weight: 700;
    font-size: 13px;
}
.small-badge { padding: 6px 10px; font-size: 12px; margin-bottom: 10px; }
h1 { font-size: clamp(2rem, 4vw, 3.6rem); line-height: 1.08; margin: 16px 0; }
.lead { font-size: 1.08rem; line-height: 1.75; color: var(--muted); max-width: 760px; }
.hero-actions, .search-bar { display:flex; gap: 12px; flex-wrap:wrap; }
.btn {
    border: none;
    border-radius: 12px;
    padding: 14px 18px;
    font-weight: 700;
    cursor: pointer;
    transition: transform .15s ease, box-shadow .15s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}
.btn:hover { transform: translateY(-1px); box-shadow: var(--shadow); }
.btn-primary { background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%); color: white; }
.btn-secondary { background: white; color: var(--text); border: 1px solid var(--border); }
.full { width:100%; }
.hero-card, .category-card, .video-card, .doc-card, .empty-state {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}
.hero-card { padding: 26px; }
.hero-card h3 { margin-top: 0; }
.hero-card ul { padding-left: 20px; color: var(--muted); line-height: 1.85; }
.filters, .categories-section, .videos-section, .documents-section { padding: 34px 0; }
.search-bar {
    background: white;
    padding: 16px;
    border-radius: 18px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
}
.search-bar input, .search-bar select {
    flex: 1 1 260px;
    min-height: 48px;
    padding: 12px 14px;
    border-radius: 12px;
    border: 1px solid var(--border);
    font-size: 15px;
}
.category-pills {
    display:flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 16px;
}
.pill {
    padding: 10px 14px;
    border-radius: 999px;
    background: white;
    border: 1px solid var(--border);
    color: var(--text);
    font-weight: 600;
}
.pill.active { background: var(--primary-dark); color: white; border-color: var(--primary-dark); }
.section-title { margin-bottom: 18px; }
.section-title h2 { margin-bottom: 8px; font-size: 2rem; }
.section-title p { margin:0; color: var(--muted); }
.category-grid, .video-grid, .doc-grid {
    display:grid;
    grid-template-columns: repeat(3, minmax(0,1fr));
    gap: 20px;
}
.category-card, .doc-card { padding: 22px; }
.category-card p, .doc-card p, .video-body p { color: var(--muted); line-height: 1.65; }
.video-card { overflow: hidden; }
.video-wrapper {
    position: relative;
    padding-top: 56.25%;
    background: #dceefe;
}
.video-wrapper iframe {
    position:absolute; inset:0; width:100%; height:100%; border:0;
}
.video-body { padding: 18px; }
.text-link { font-weight: 700; }
.empty-state {
    padding: 28px;
    text-align: center;
    color: var(--muted);
}
.footer {
    padding: 28px 0 40px;
    border-top: 1px solid var(--border);
    background: #f2f8ff;
    margin-top: 24px;
}
.footer-grid {
    display:grid;
    grid-template-columns: 1fr auto;
    gap: 20px;
}
.footer a { display:block; margin: 8px 0; color: var(--muted); }
.admin-shell {
    display: grid;
    grid-template-columns: 260px 1fr;
    min-height: 100vh;
}
.sidebar {
    background: #0f3d69;
    color: white;
    padding: 24px;
}
.sidebar a {
    color: rgba(255,255,255,.92);
    display:block;
    padding: 10px 12px;
    border-radius: 10px;
    margin: 8px 0;
}
.sidebar a:hover, .sidebar a.active { background: rgba(255,255,255,.14); }
.main-panel { padding: 26px; }
.stat-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0,1fr));
    gap: 18px;
    margin-bottom: 24px;
}
.stat-card, .form-card, .table-card, .flash {
    background: white;
    border: 1px solid var(--border);
    border-radius: 18px;
    box-shadow: var(--shadow);
}
.stat-card { padding: 20px; }
.stat-card h3 { margin: 0 0 8px; font-size: 15px; color: var(--muted); }
.stat-card strong { font-size: 2rem; }
.form-card, .table-card { padding: 20px; margin-bottom: 20px; }
.form-grid {
    display:grid;
    grid-template-columns: repeat(2, minmax(0,1fr));
    gap: 14px;
}
.form-grid .full-row { grid-column: 1 / -1; }
label { display:block; font-weight:700; margin-bottom: 6px; }
input[type="text"], input[type="password"], input[type="url"], input[type="number"], textarea, select, input[type="file"] {
    width:100%;
    min-height: 46px;
    padding: 12px 14px;
    border:1px solid var(--border);
    border-radius: 12px;
    font-size: 15px;
}
textarea { min-height: 110px; resize: vertical; }
table { width:100%; border-collapse: collapse; }
th, td { padding: 12px; border-bottom: 1px solid var(--border); text-align:left; vertical-align: top; }
th { color: var(--muted); font-size: 14px; }
.login-page {
    min-height: 100vh;
    display:grid;
    place-items:center;
    padding: 24px;
    background: linear-gradient(135deg, #eaf6ff 0%, white 100%);
}
.login-card {
    width:min(460px, 100%);
    background: white;
    border:1px solid var(--border);
    border-radius: 22px;
    box-shadow: var(--shadow);
    padding: 28px;
}
.flash { padding: 14px 16px; margin-bottom: 16px; }
.flash.success { border-left: 5px solid #28a745; }
.flash.error { border-left: 5px solid #dc3545; }
.inline-actions { display:flex; gap:10px; flex-wrap:wrap; }
@media (max-width: 980px) {
    .hero-grid, .category-grid, .video-grid, .doc-grid, .stat-grid, .form-grid, .footer-grid, .admin-shell {
        grid-template-columns: 1fr;
    }
    .sidebar { min-height: auto; }
}