/* --- KONFIGURASI WARNA & FONT --- */
:root {
    --primary: #0052d4;      /* Biru Penerbangan */
    --secondary: #6fb1fc;    /* Biru Langit */
    --accent: #ffcc00;       /* Kuning */
    --dark: #1a1a1a;         /* Hitam Elegan */
    --light: #ffffff;
    --gray: #f8f9fa;
    --text: #333333;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

/* --- RESET DASAR --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

body {
    scroll-behavior: smooth;
    line-height: 1.6;
    color: var(--text);
    background-color: var(--light);
}

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

/* --- HEADER & NAVIGASI --- */
header {
    background: rgba(255, 255, 255, 0.95);
    padding: 15px 0;
    position: fixed;
    width: 100%;
    top: 0;
    box-shadow: 0 2px 15px rgba(0,0,0,0.05);
    z-index: 1000;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--dark);
    letter-spacing: -1px;
}

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

.nav-links {
    list-style: none;
    display: flex;
    align-items: center;
}

.nav-links li a {
    text-decoration: none;
    color: var(--dark);
    margin: 0 15px;
    font-weight: 600;
    font-size: 0.95rem;
    transition: 0.3s ease;
}

.nav-links li a:hover {
    color: var(--primary);
}

.btn-primary {
    background: var(--primary);
    color: white !important;
    padding: 10px 25px;
    border-radius: 50px;
    transition: transform 0.3s;
}

/* --- HERO SECTION --- */
.hero {
    height: 100vh;
    background: linear-gradient(135deg, rgba(0, 82, 212, 0.85), rgba(111, 177, 252, 0.75)),
                url('https://images.unsplash.com/photo-1517976487492-5750f3195933?auto=format&fit=crop&w=1600&q=80');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    display: flex;
    align-items: center;
    color: white;
    padding-top: 80px;
}

.hero-content {
    max-width: 700px;
    margin-left: 5%;
}

.badge {
    background: rgba(255, 255, 255, 0.2);
    padding: 6px 16px;
    border-radius: 30px;
    font-size: 0.85rem;
    border: 1px solid rgba(255,255,255,0.3);
}

.hero h1 {
    font-size: 3.5rem;
    margin: 20px 0;
    line-height: 1.2;
}

.hero-btns {
    margin-top: 30px;
}

.hero-btns a {
    text-decoration: none;
    padding: 15px 30px;
    border-radius: 8px;
    display: inline-block;
    font-weight: bold;
    transition: 0.3s;
}

.btn-main { background: var(--light); color: var(--primary); margin-right: 15px; }
.btn-outline { border: 2px solid var(--light); color: var(--light); }

/* --- REQUIREMENTS SECTION --- */
.requirements {
    padding: 100px 20px;
}

.section-title {
    text-align: center;
    margin-bottom: 50px;
}

.req-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.req-card {
    background: var(--gray);
    padding: 40px;
    border-radius: 15px;
    text-align: center;
    transition: 0.3s;
}

.req-card:hover {
    transform: translateY(-10px);
    background: white;
    box-shadow: var(--shadow);
}

.req-card i {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 20px;
}

/* --- REGISTRATION SECTION --- */
.registration {
    background: #f0f4f8;
    padding: 100px 0;
}

.flex-row {
    display: flex;
    align-items: center;
    gap: 50px;
    flex-wrap: wrap;
}

.form-info {
    flex: 1;
    min-width: 300px;
}

.benefit-list {
    list-style: none;
    margin-top: 25px;
}

.benefit-list li {
    margin-bottom: 15px;
    display: flex;
    align-items: center;
}

.benefit-list i {
    color: #28a745;
    margin-right: 10px;
}

.form-card {
    flex: 1;
    background: white;
    padding: 40px;
    border-radius: 20px;
    box-shadow: var(--shadow);
    min-width: 300px;
}

/* --- INPUT BOXES (Disamakan dengan HTML) --- */
.input-box {
    margin-bottom: 20px;
}

.input-row {
    display: flex;
    gap: 15px;
}

.input-box label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    font-size: 0.9rem;
}

.input-box input, 
.input-box select {
    width: 100%;
    padding: 12px;
    border: 1.5px solid #ddd;
    border-radius: 10px;
    outline: none;
    transition: 0.3s;
}

.input-box input:focus {
    border-color: var(--primary);
}

/* --- SUBMIT BUTTON --- */
.btn-submit {
    width: 100%;
    padding: 15px;
    background: linear-gradient(to right, var(--primary), var(--secondary));
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    transition: 0.3s;
}

.btn-submit:hover {
    filter: brightness(1.1);
}

/* --- FOOTER --- */
footer {
    padding: 40px;
    text-align: center;
    background: var(--dark);
    color: white;
}

/* --- RESPONSIVE --- */
@media (max-width: 768px) {
    .nav-links { display: none; }
    .hero h1 { font-size: 2.5rem; }
    .input-row { flex-direction: column; gap: 0; }
    .flex-row { flex-direction: column; text-align: center; }
    .benefit-list li { justify-content: center; }
}