:root {
    --primary: #1e293b;
    --primary-dark: #0f172a;
    --accent: #22d3ee;
    --accent-2: #38bdf8;
    --warn: #f59e0b;
    --surface: #ffffff;
    --surface-soft: #f8fafc;
    --text: #0f172a;
    --muted: #475569;
    --border: #e2e8f0;
    --shadow-sm: 0 8px 24px rgba(15, 23, 42, 0.08);
    --shadow-md: 0 14px 40px rgba(15, 23, 42, 0.12);
    --radius: 18px;
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: "Segoe UI", "Inter", Tahoma, sans-serif;
    color: var(--text);
    background:
        radial-gradient(900px 400px at 100% 0%, rgba(34, 211, 238, 0.12), transparent 60%),
        radial-gradient(900px 420px at 0% 10%, rgba(15, 23, 42, 0.14), transparent 55%),
        var(--surface-soft);
    line-height: 1.7;
}

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

a:hover {
    color: #0284c7;
}

.navbar,
.navbar.bg-primary,
.navbar.bg-dark,
.navbar-dark,
.navbar-light {
    background: linear-gradient(120deg, #1e293b 0%, #0f172a 100%) !important;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: 0 10px 28px rgba(2, 6, 23, 0.35);
}

.navbar .nav-link {
    color: rgba(255, 255, 255, 0.92) !important;
    font-weight: 600;
}

.navbar .nav-link:hover,
.navbar .nav-link:focus {
    color: #facc15 !important;
}

.navbar-brand {
    font-weight: 800;
    letter-spacing: 0.3px;
}

.navbar .dropdown-menu {
    background: #0f172a;
    border: 1px solid rgba(148, 163, 184, 0.18);
    border-radius: 14px;
}

.navbar .dropdown-item {
    color: #e2e8f0;
}

.navbar .dropdown-item:hover,
.navbar .dropdown-item:focus {
    background: rgba(148, 163, 184, 0.18);
    color: #fff;
}

.hero-section {
    min-height: 520px;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
}

.hero-video {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 0;
    transform: scale(1.02);
}

.hero-overlay {
    position: absolute;
    inset: 0;
    z-index: 1;
    background:
        linear-gradient(110deg, rgba(15, 23, 42, 0.88) 10%, rgba(30, 41, 59, 0.62) 45%, rgba(14, 165, 233, 0.35) 100%);
}

.hero-section .container {
    position: relative;
    z-index: 2;
}

.hero-section h1 {
    font-size: clamp(2rem, 5vw, 3.3rem);
    font-weight: 800;
    letter-spacing: 0.2px;
    text-shadow: 0 12px 26px rgba(2, 6, 23, 0.5);
}

.hero-section .lead {
    max-width: 820px;
    margin-inline: auto;
    color: rgba(255, 255, 255, 0.95);
    font-size: 1.2rem;
}

.page-header {
    position: relative;
    background: linear-gradient(125deg, #0f172a 0%, #1e293b 55%, #0ea5e9 140%);
    margin-bottom: 2.4rem;
}

.page-header h1 {
    font-weight: 800;
    letter-spacing: 0.3px;
    text-shadow: 0 8px 24px rgba(2, 6, 23, 0.45);
}

.page-header video + .container h1,
.page-header img + .container h1 {
    text-shadow: 0 12px 30px rgba(2, 6, 23, 0.7), 0 2px 10px rgba(2, 6, 23, 0.35);
}

.card {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(6px);
    transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
}

.card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-md);
    border-color: rgba(14, 165, 233, 0.26);
}

.card .card-title {
    font-weight: 750;
    color: var(--primary-dark);
}

.card .card-text,
.text-muted {
    color: var(--muted) !important;
}

.news-card,
.department-card {
    overflow: hidden;
}

.news-card img,
.department-card img,
.news-card video,
.department-card video {
    transition: transform .45s ease;
}

.news-card:hover img,
.department-card:hover img,
.news-card:hover video,
.department-card:hover video {
    transform: scale(1.04);
}

.stat-box,
.achievement-box {
    position: relative;
    border-radius: var(--radius);
    padding: 1.45rem;
    background: linear-gradient(180deg, rgba(255,255,255,0.98), rgba(248,250,252,0.98));
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.stat-box::after,
.achievement-box::after {
    content: "";
    position: absolute;
    width: 120px;
    height: 120px;
    right: -40px;
    top: -40px;
    border-radius: 999px;
    background: radial-gradient(circle, rgba(14,165,233,0.22), rgba(14,165,233,0));
    pointer-events: none;
}

.stat-box h2,
.achievement-box h3 {
    font-weight: 800;
}

.btn {
    border-radius: 12px;
    font-weight: 700;
    letter-spacing: 0.1px;
    transition: transform .18s ease, box-shadow .18s ease;
}

.btn:hover {
    transform: translateY(-2px);
}

.btn-primary {
    background: linear-gradient(135deg, #1e293b, #0f172a);
    border-color: #0f172a;
    box-shadow: 0 8px 20px rgba(15, 23, 42, 0.35);
}

.btn-primary:hover {
    background: linear-gradient(135deg, #0f172a, #020617);
    border-color: #020617;
}

.btn-success {
    background: linear-gradient(135deg, #16a34a, #15803d);
    border-color: #15803d;
}

.btn-outline-primary {
    border-color: var(--accent);
    color: #0369a1;
}

.btn-outline-primary:hover {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

.category-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
}

.category-tab {
    display: inline-block;
    padding: 0.55rem 1rem;
    border-radius: 999px;
    border: 1px solid #cbd5e1;
    color: #334155;
    font-weight: 650;
    background: #fff;
}

.category-tab:hover {
    color: #0f172a;
    border-color: #94a3b8;
    background: #f8fafc;
}

.category-tab.active {
    border-color: #0f172a;
    color: #fff;
    background: linear-gradient(135deg, #1e293b, #0f172a);
    box-shadow: 0 8px 18px rgba(15, 23, 42, 0.25);
}

.department-content,
.news-content {
    color: #1e293b;
}

.department-content h3,
.news-content h3 {
    color: var(--primary);
    font-weight: 760;
}

.form-control,
.form-select {
    border-radius: 12px;
    border: 1px solid #cbd5e1;
}

.form-control:focus,
.form-select:focus {
    border-color: #0ea5e9;
    box-shadow: 0 0 0 .2rem rgba(14, 165, 233, 0.2);
}

.alert {
    border: 0;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
}

.page-preloader {
    position: fixed;
    inset: 0;
    z-index: 2000;
    display: grid;
    place-items: center;
    background:
        radial-gradient(500px 220px at 50% 20%, rgba(34, 211, 238, 0.18), transparent 60%),
        linear-gradient(145deg, #050a14, #0f172a);
    transition: opacity .35s ease, visibility .35s ease;
}

.page-preloader.hidden {
    opacity: 0;
    visibility: hidden;
}

.preloader-shell {
    position: relative;
    width: 110px;
    height: 110px;
    display: grid;
    place-items: center;
}

.preloader-ring {
    position: absolute;
    inset: 0;
    border-radius: 999px;
    border: 2px solid rgba(255, 255, 255, 0.12);
    border-top-color: #22d3ee;
    border-right-color: #38bdf8;
    animation: spinPulse 1s linear infinite;
    box-shadow: 0 0 0 10px rgba(255, 255, 255, 0.03), 0 18px 35px rgba(2, 6, 23, 0.6);
}

.preloader-logo {
    width: 68px;
    height: 68px;
    border-radius: 18px;
    background: rgba(15, 23, 42, 0.65);
    display: grid;
    place-items: center;
    box-shadow: inset 0 0 0 1px rgba(148, 163, 184, 0.2), 0 16px 24px rgba(2, 6, 23, 0.35);
    animation: logoPulse 1.4s ease-in-out infinite;
}

.preloader-logo img {
    max-width: 48px;
    height: auto;
    display: block;
    filter: drop-shadow(0 6px 12px rgba(2, 6, 23, 0.4));
}

.preloader-text {
    margin-top: 16px;
    color: rgba(255, 255, 255, 0.82);
    letter-spacing: 2px;
    font-size: 0.85rem;
    text-transform: uppercase;
}

@keyframes spinPulse {
    0% { transform: rotate(0); }
    100% { transform: rotate(360deg); }
}

@keyframes logoPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.06); }
}

.reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity .6s ease, transform .6s ease;
}

.reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
}

footer {
    border-top: 1px solid rgba(148, 163, 184, 0.24);
    background: linear-gradient(135deg, #111827, #0f172a) !important;
}

footer a:hover {
    color: #facc15 !important;
}

.bg-primary {
    background-color: var(--primary) !important;
}

.text-primary {
    color: var(--primary) !important;
}

@media (max-width: 991px) {
    .hero-section {
        min-height: 430px;
    }
}

@media (max-width: 767px) {
    .hero-section {
        min-height: 360px;
    }

    .page-header h1 {
        font-size: 1.75rem;
    }
}