:root {
    --biru-tua: #0A1F44;
    --hitam: #121212;
    --merah: #D32F2F;
    --putih: #FFFFFF;
    --abu-lembut: #F5F5F5;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Roboto, 'Open Sans', sans-serif;
}

body {
    background-color: #fff;
    color: #333;
    line-height: 1.6;
}

nav {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 999;
    background: rgba(10, 31, 68, 0.95);
    padding: 15px 0;
    transition: 0.3s;
}

nav .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

nav .logo {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--putih);
    font-size: 1.5rem;
    font-weight: 700;
    text-decoration: none;
}

nav .logo img {
    height: 45px;
    width: auto;
}

nav .logo span {
    color: var(--merah);
}

nav ul {
    list-style: none;
    display: flex;
    gap: 30px;
}

nav ul li a {
    color: var(--putih);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

nav ul li a:hover,
nav ul li a.active {
    color: var(--merah);
}

.slider {
    position: relative;
    height: 100vh;
    overflow: hidden;
    margin-top: 0;
}

.slide {
    position: absolute;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 1s ease-in-out;
}

.slide.active {
    opacity: 1;
}

.slide-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    background: linear-gradient(135deg, #0A1F44, #121212);
}

.slide-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, rgba(10,31,68,0.75), rgba(18,18,18,0.85));
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    color: white;
    padding: 20px;
}

.slide-overlay h1 {
    font-size: 3rem;
    margin-bottom: 20px;
    text-shadow: 2px 2px 8px rgba(0,0,0,0.5);
}

.slide-overlay p {
    font-size: 1.2rem;
    max-width: 800px;
    margin-bottom: 30px;
}

.btn-utama {
    background: var(--merah);
    color: white !important;
    padding: 14px 35px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: transform 0.3s, box-shadow 0.3s;
    display: inline-block;
}

.btn-utama:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(211, 47, 47, 0.4);
}

.section {
    padding: 80px 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.section h2 {
    text-align: center;
    font-size: 2rem;
    color: var(--biru-tua);
    margin-bottom: 50px;
    position: relative;
}

.section h2::after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background: var(--merah);
    margin: 10px auto 0;
}

footer {
    background: var(--hitam);
    color: #ccc;
    padding: 50px 20px;
}

footer .container {
    max-width: 1200px;
    margin: 0 auto;
}

footer h3 {
    color: white;
    margin-bottom: 20px;
}

@media (max-width: 768px) {
    nav ul { gap: 12px; font-size: 0.85rem; }
    .slide-overlay h1 { font-size: 1.8rem; }
    .slide-overlay p { font-size: 1rem; }
    nav .logo { font-size: 1.2rem; }
}