:root {
    --primary-color: #0f4c81; /* Classic Blue */
    --secondary-color: #fca311; /* Accent Orange */
    --bg-light: #f8f9fa;
    --text-main: #333333;
    --text-muted: #666666;
    --white: #ffffff;
    --glass-bg: rgba(255, 255, 255, 0.85);
    --glass-border: rgba(255, 255, 255, 0.18);
    --shadow-soft: 0 8px 32px 0 rgba(31, 38, 135, 0.15);
    --transition: all 0.3s ease-in-out;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
}

body {
    background-color: var(--bg-light);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4 {
    font-weight: 700;
    color: var(--primary-color);
}

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

/* Header & Navigation */
header {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--glass-border);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-soft);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary-color);
}

.logo img {
    height: 45px;
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    font-weight: 600;
    color: var(--primary-color);
    position: relative;
    padding-bottom: 0.25rem;
}

.nav-links a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background-color: var(--secondary-color);
    transition: var(--transition);
}

.nav-links a:hover::after, .nav-links a.active::after {
    width: 100%;
}

/* Hero Section */
.hero {
    margin-top: 80px;
    background: linear-gradient(135deg, var(--primary-color) 0%, #1a365d 100%);
    color: var(--white);
    padding: 6rem 2rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: url('https://images.unsplash.com/photo-1523050854058-8df90110c9f1?q=80&w=2070&auto=format&fit=crop') center/cover;
    opacity: 0.15;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
}

.hero h1 {
    color: var(--white);
    font-size: 3rem;
    margin-bottom: 1rem;
    animation: fadeInUp 1s ease-out;
}

.hero p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    animation: fadeInUp 1.2s ease-out;
}

/* Sections General */
section {
    padding: 5rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background: var(--secondary-color);
    margin: 1rem auto 0;
    border-radius: 2px;
}

/* Grid Layouts */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.grid-4 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 2rem;
}

/* Cards (Glassmorphism & Modern) */
.card {
    background: var(--white);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: var(--shadow-soft);
    transition: var(--transition);
    border: 1px solid rgba(0,0,0,0.05);
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(31, 38, 135, 0.2);
}

.card-img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 8px;
    margin-bottom: 1rem;
}

/* Ekstra & Organisasi */
.ekstra-card {
    text-align: center;
}

.ekstra-card h3 {
    margin: 1rem 0;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 1rem;
}

.social-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--bg-light);
    color: var(--primary-color);
    font-size: 1.2rem;
}

.social-links a:hover {
    background: var(--primary-color);
    color: var(--white);
    transform: scale(1.1);
}

/* Profil Kepsek */
.kepsek-section {
    display: flex;
    align-items: center;
    gap: 3rem;
    background: var(--white);
    padding: 3rem;
    border-radius: 20px;
    box-shadow: var(--shadow-soft);
}

.kepsek-img {
    width: 300px;
    height: 300px;
    border-radius: 50%;
    object-fit: cover;
    border: 5px solid var(--bg-light);
    box-shadow: var(--shadow-soft);
}

.kepsek-text {
    flex: 1;
}

/* Visi Misi */
.visi-misi {
    text-align: center;
}

.visi-misi ul {
    list-style-type: none;
    padding: 0;
    margin-top: 1rem;
}

.visi-misi li {
    background: var(--white);
    margin-bottom: 0.5rem;
    padding: 1rem;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    transition: var(--transition);
}

.visi-misi li:hover {
    transform: scale(1.02);
    border-left: 4px solid var(--secondary-color);
}

/* Footer */
footer {
    background: var(--primary-color);
    color: var(--white);
    padding: 4rem 2rem 2rem;
    margin-top: 4rem;
}

.footer-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-col h3 {
    color: var(--white);
    margin-bottom: 1.5rem;
    position: relative;
    padding-bottom: 0.5rem;
}

.footer-col h3::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 40px;
    height: 2px;
    background: var(--secondary-color);
}

.footer-col p, .footer-col li {
    margin-bottom: 0.8rem;
    color: rgba(255,255,255,0.8);
}

.footer-col ul {
    list-style: none;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.1);
    color: rgba(255,255,255,0.6);
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive */
.hamburger {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--primary-color);
}

@media (max-width: 768px) {
    .hamburger {
        display: block;
    }
    
    .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: var(--glass-bg);
        backdrop-filter: blur(10px);
        -webkit-backdrop-filter: blur(10px);
        padding: 1.5rem 0;
        box-shadow: var(--shadow-soft);
        text-align: center;
        gap: 1.5rem;
    }
    
    .nav-links.show-nav {
        display: flex;
    }
    
    .kepsek-section {
        flex-direction: column;
        text-align: center;
    }
    
    .kepsek-img {
        width: 200px;
        height: 200px;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .logo {
        font-size: 1.2rem;
    }
    
    .grid-2, .grid-3, .grid-4 {
        grid-template-columns: 1fr;
    }
}