:root {
    --primary-color: #0d6efd;
    --primary-dark: #0a58ca;
    --accent-color: #ffaa00; /* Warna Oranye untuk energi/semangat */
    --dark-color: #1e293b;
    --light-bg: #f8f9fa;
    --font-heading: 'Poppins', sans-serif;
    --font-body: 'Inter', sans-serif;
    --shadow-soft: 0 10px 40px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 20px 40px rgba(13, 110, 253, 0.15);
}

body {
    font-family: var(--font-body);
    color: #444;
    line-height: 1.6;
    padding-top: 76px; /* Disesuaikan dengan tinggi navbar */
    overflow-x: hidden;
    background-color: var(--light-bg);
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    color: var(--dark-color);
    font-weight: 700;
}

a { text-decoration: none; }

/* --- 2. NAVBAR MODERN (Glassmorphism) --- */
.navbar {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 2px 15px rgba(0,0,0,0.05);
    padding: 15px 0;
    transition: all 0.3s ease;
}

.navbar-brand {
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--primary-color) !important;
    letter-spacing: -0.5px;
}

.navbar .navbar-nav .nav-link {
    position: relative;
    padding: 8px 16px;
    margin: 0 4px;
    border-radius: 50px;
    font-weight: 500;
    color: #555;
    transition: all 0.3s ease;
}

/* Hover Effect */
.navbar .navbar-nav .nav-link:hover {
    background-color: rgba(13, 110, 253, 0.08) !important;
    color: var(--primary-color) !important;
    transform: translateY(-1px);
}

/* Active State */
.navbar .navbar-nav .nav-link.active {
    background-color: rgba(13, 110, 253, 0.1) !important;
    color: var(--primary-color) !important;
    font-weight: 600;
}

/* Tombol Daftar di Navbar */
.btn-navbar {
    background-color: var(--primary-color);
    color: white;
    border-radius: 50px;
    padding: 8px 25px;
    font-weight: 600;
    box-shadow: 0 4px 15px rgba(13, 110, 253, 0.3);
    border: none;
    transition: all 0.3s ease;
}

.btn-navbar:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(13, 110, 253, 0.4);
    color: white;
}

/* --- 3. HERO SECTION IMPROVED --- */
.hero {
    position: relative;
    /* NOTE: Ganti URL gambar di bawah dengan path lokal jika sudah ada.
       Contoh: url('../../assets/img/hero-bg.jpg'); 
       (naik 2 folder dari css -> assets -> img)
    */
    background: linear-gradient(135deg, rgba(13, 110, 253, 0.9), rgba(30, 41, 59, 0.8)),
                url('https://images.unsplash.com/photo-1529070538774-1843cb3265df');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    padding: 160px 0 120px;
    color: white;
    clip-path: ellipse(150% 100% at 50% 0%);
    margin-bottom: 50px;
}

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

.hero p {
    font-size: 1.15rem;
    opacity: 0.9;
    max-width: 600px;
    margin-bottom: 30px;
}

.btn-hero {
    background-color: var(--accent-color);
    color: white;
    padding: 12px 35px;
    border-radius: 50px;
    font-weight: 600;
    border: none;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(255, 170, 0, 0.4);
}

.btn-hero:hover {
    background-color: #e69900;
    transform: translateY(-3px);
    color: white;
}

/* --- 4. FEATURE CARDS --- */
.section-title {
    text-align: center;
    margin-bottom: 50px;
}

.section-title span {
    color: var(--primary-color);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-size: 0.9rem;
}

.program-card {
    background: white;
    border-radius: 20px;
    padding: 40px 30px;
    border: 1px solid rgba(0,0,0,0.03);
    box-shadow: var(--shadow-soft);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    height: 100%;
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.program-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 0;
    background: var(--primary-color);
    z-index: -1;
    transition: 0.4s ease;
    border-radius: 20px 20px 0 0;
}

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

.program-card:hover .icon-box {
    background: white;
    color: var(--primary-color);
}

.icon-box {
    width: 70px;
    height: 70px;
    background: rgba(13, 110, 253, 0.1);
    color: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    margin-bottom: 25px;
    transition: 0.3s ease;
}

/* --- 5. CTA SECTION --- */
.cta {
    background: linear-gradient(45deg, var(--primary-color), var(--primary-dark));
    padding: 100px 0;
    position: relative;
    overflow: hidden;
    border-radius: 30px;
    margin: 80px 20px;
    color: white;
    text-align: center;
}

.cta::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -20%;
    width: 500px;
    height: 500px;
    background: rgba(255,255,255,0.1);
    border-radius: 50%;
}

/* --- 6. WHATSAPP FLOAT --- */
.whatsapp-float {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 9999;
    background: #25D366;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    box-shadow: 0 4px 20px rgba(37, 211, 102, 0.4);
    transition: all 0.3s ease;
    animation: pulse-green 2s infinite;
}

.whatsapp-float i {
    font-size: 32px;
    color: white;
}

.whatsapp-float:hover {
    transform: scale(1.1);
    background: #20bd5a;
}

@keyframes pulse-green {
    0% { box-shadow: 0 0 0 0 rgba(37, 211, 102, 0.7); }
    70% { box-shadow: 0 0 0 20px rgba(37, 211, 102, 0); }
    100% { box-shadow: 0 0 0 0 rgba(37, 211, 102, 0); }
}

/* --- 7. RESPONSIVE --- */
@media (max-width: 768px) {
    .hero h1 { font-size: 2.5rem; }
    .hero { clip-path: ellipse(180% 100% at 50% 0%); padding-top: 120px;}
    .cta { margin: 50px 0; border-radius: 0; }
}