:root {
    --primary-color: #0d6efd;
    /* Biru yang lebih vibrant */
    --primary-dark: #0a58ca;
    --secondary-color: #6c757d;
    --success-color: #198754;
    --warning-color: #ffc107;
    --dark-color: #212529;
    --light-color: #ffffff;
    --body-bg: #f8f9fa;
    --font-family: 'Poppins', sans-serif;
    --gradient-text: linear-gradient(45deg, var(--primary-color), #338dff);
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    line-height: 1.7;
    color: var(--dark-color);
    background-color: var(--body-bg);
}

/* === Utility & Container === */
.container {
    max-width: 1140px;
    margin: auto;
    padding: 0 1.5rem;
}

.section {
    padding: 5rem 0;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-header h2 {
    font-size: 2.8rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    color: var(--primary-dark);
}

.section-header p {
    max-width: 600px;
    margin: 0 auto;
    color: var(--secondary-color);
}

.gradient-text {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* === HERO SECTION === */
.hero {
    background: linear-gradient(rgba(13, 110, 253, 0.8), rgba(10, 88, 202, 0.8)), url('https://images.unsplash.com/photo-1542744173-8e7e53415bb0?q=80&w=2070&auto=format&fit=crop') no-repeat center center/cover;
    height: 100vh;
    color: var(--light-color);
    display: flex;
    align-items: center;
    text-align: center;
}

.hero-content h1 {
    font-size: 4rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1rem;
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 2.5rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.cta-button {
    display: inline-block;
    background: var(--warning-color);
    color: var(--dark-color);
    padding: 15px 35px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 700;
    font-size: 1rem;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(255, 193, 7, 0.4);
}

.cta-button:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(255, 193, 7, 0.5);
}

/* === FEATURES SECTION === */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--light-color);
    padding: 2.5rem 2rem;
    text-align: center;
    border-radius: 15px;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-10px);
}

.feature-card .icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
}

.feature-card p {
    font-size: 0.95rem;
    color: var(--secondary-color);
}

/* === PROGRAMS SECTION === */
#programs {
    background-color: var(--light-color);
}

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

.program-card {
    background: var(--light-color);
    border-radius: 15px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all 0.4s ease;
    position: relative;
}

.program-card:hover {
    transform: scale(1.05);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.card-image-wrapper {
    position: relative;
    height: 220px;
}

.card-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.card-tag {
    position: absolute;
    top: 1rem;
    left: 1rem;
    background: var(--success-color);
    color: var(--light-color);
    padding: 5px 12px;
    font-size: 0.8rem;
    font-weight: 600;
    border-radius: 50px;
}

.card-content {
    padding: 1.5rem;
}

.card-content h3 {
    font-size: 1.4rem;
    margin-bottom: 0.5rem;
    transition: color 0.3s ease;
}

.program-card:hover .card-content h3 {
    color: var(--primary-color);
}

.card-content p {
    font-size: 0.95rem;
    color: var(--secondary-color);
    margin-bottom: 1.5rem;
}

.card-content .cta-button {
    width: 100%;
    text-align: center;
    padding: 12px;
    font-size: 0.95rem;
}

/* === COUNTDOWN SECTION === */
#countdown-section {
    background: var(--gradient-text);
    color: var(--light-color);
    text-align: center;
}

#countdown-section h2 {
    color: var(--light-color);
    font-size: 2.5rem;
}

#countdown-timer {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-top: 2rem;
    margin-bottom: 2.5rem;
}

.timer-box {
    background: rgba(255, 255, 255, 0.2);
    padding: 1rem;
    border-radius: 10px;
    min-width: 100px;
}

.timer-box span {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
}

.timer-box p {
    font-size: 0.9rem;
    opacity: 0.8;
}

/* === FOOTER === */
.footer {
    background-color: var(--dark-color);
    color: var(--light-color);
    text-align: center;
    padding: 2rem 0;
    font-size: 0.9rem;
}

/* === RESPONSIVE === */
@media(max-width: 992px) {
    .hero-content h1 {
        font-size: 3rem;
    }

    .section-header h2 {
        font-size: 2.2rem;
    }
}

@media(max-width: 768px) {
    .hero {
        height: auto;
        padding: 8rem 0;
    }

    .hero-content h1 {
        font-size: 2.5rem;
    }

    .section {
        padding: 4rem 0;
    }

    #countdown-timer {
        flex-wrap: wrap;
    }
}