:root {
    --bg-sky: #E0F7FA;
    --bg-cloud: #FFFFFF;
    --primary: #00B4D8;
    --primary-light: #90E0EF;
    --primary-dark: #0077B6;
    --secondary: #FFD166;
    --accent: #EF476F;
    --success: #06D6A0;
    --text-main: #333333;
    --text-muted: #666666;
    --card-bg: rgba(255, 255, 255, 0.95);
    --shadow: 0 10px 30px rgba(0, 119, 182, 0.15);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Baloo 2', 'Quicksand', sans-serif; /* Recommended bright, bouncy fonts */
}

body {
    background-color: var(--bg-sky);
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(255,209,102,0.2) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(239,71,111,0.15) 0%, transparent 40%);
    color: var(--text-main);
    overflow-x: hidden;
    line-height: 1.6;
}

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

/* Card Style (Soft, Bright, Friendly) */
.glass-card {
    background: var(--card-bg);
    border: 4px solid var(--primary-light);
    border-radius: 32px;
    padding: 2.5rem;
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
}

.glass-card::before {
    content: '';
    position: absolute;
    top: -10px; left: -10px; width: 40px; height: 40px;
    background: var(--secondary);
    border-radius: 50%;
    opacity: 0.5;
    z-index: 0;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding-top: 100px;
    position: relative;
    background: url('Feature Graphic.png') center/cover no-repeat; /* Generated Image */
}

/* Fallback gradient if image fails */
.hero::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: linear-gradient(to bottom, rgba(224, 247, 250, 0.4), rgba(224, 247, 250, 0.9));
    z-index: 0;
}

.hero-content {
    max-width: 800px;
    z-index: 1;
    background: rgba(255, 255, 255, 0.85);
    padding: 3rem;
    border-radius: 40px;
    border: 5px solid var(--secondary);
    box-shadow: 0 15px 40px rgba(0,0,0,0.1);
}

.app-icon {
    width: 120px;
    height: 120px;
    border-radius: 30px;
    margin-bottom: 1.5rem;
    box-shadow: 0 10px 30px rgba(0, 180, 216, 0.4);
    animation: bounce 3s ease-in-out infinite;
    border: 4px solid white;
}

.hero-title {
    font-size: clamp(2.5rem, 8vw, 4rem);
    font-weight: 800;
    color: var(--primary-dark);
    text-shadow: 2px 2px 0px var(--secondary);
    margin-bottom: 1rem;
    line-height: 1.1;
    letter-spacing: -1px;
}

.hero-tagline {
    font-size: 1.4rem;
    color: var(--text-main);
    font-weight: 600;
    margin-bottom: 2rem;
}

.btn-group {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: 1rem 2.5rem;
    border-radius: 50px;
    font-weight: 800;
    font-size: 1.2rem;
    text-decoration: none;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    border: 3px solid transparent;
}

.btn-primary {
    background: var(--accent);
    color: white;
    box-shadow: 0 8px 0px #C92A54; /* 3D Button Effect */
}

.btn-primary:hover {
    transform: translateY(4px);
    box-shadow: 0 4px 0px #C92A54;
}

.btn-secondary {
    background: white;
    color: var(--primary-dark);
    border-color: var(--primary-light);
    box-shadow: 0 8px 0px var(--primary-light);
}
.btn-secondary:hover {
    transform: translateY(4px);
    box-shadow: 0 4px 0px var(--primary-light);
}

/* Overviews (Apa Itu & Planets) */
.section-title {
    text-align: center;
    font-size: 3rem;
    color: var(--primary-dark);
    margin-bottom: 3rem;
    text-shadow: 2px 2px 0px var(--secondary);
}

.about-chars {
    display: flex;
    justify-content: space-around;
    align-items: center;
    margin-top: 2rem;
}
.about-chars img {
    height: 150px;
    animation: float 4s ease-in-out infinite;
}

.planet-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-top: 3rem;
}
.planet-card {
    background: white;
    padding: 1rem;
    border-radius: 20px;
    box-shadow: var(--shadow);
    text-align: center;
    border: 3px solid var(--primary-light);
    transition: transform 0.3s;
}
.planet-card:hover { text-align: center; transform: scale(1.05) rotate(3deg); }
.planet-card img { width: 100%; border-radius: 12px; }
.planet-card h4 { margin-top: 1rem; color: var(--accent); font-size: 1.2rem;}

/* Features Section */
.features {
    padding: 100px 0;
    background: url('bg2.png') center/cover no-repeat; /* Use existing background */
}

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

.feature-card {
    text-align: center;
    transition: transform 0.3s ease;
}

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

.feature-icon {
    width: 100px;
    height: 100px;
    margin-bottom: 1.5rem;
    animation: bounce 2s infinite alternate;
}

/* Gallery Section */
.gallery {
    padding: 100px 0;
    overflow: hidden;
}

.gallery-track {
    display: flex;
    gap: 20px;
    padding: 20px;
    animation: scroll 40s linear infinite;
    width: max-content;
}

.gallery-item {
    width: 250px;
    border-radius: 24px;
    overflow: hidden;
    flex-shrink: 0;
    border: 4px solid var(--secondary);
    box-shadow: var(--shadow);
}

.gallery-item img {
    width: 100%;
    height: auto;
    display: block;
}

/* Tutorial Section */
.tutorial {
    padding: 80px 0;
}

.step-card {
    display: flex;
    gap: 2rem;
    align-items: center;
    margin-bottom: 2rem;
    padding: 2rem;
    border-left: 8px solid var(--success);
}

.step-number {
    font-size: 4rem;
    font-weight: 900;
    color: var(--success);
    background: var(--bg-sky);
    width: 80px; height: 80px;
    display: flex; align-items: center; justify-content: center;
    border-radius: 50%;
    border: 4px solid var(--success);
}

/* Footer & Action Area */
.cta-section {
    background: var(--primary);
    padding: 80px 0;
    text-align: center;
    color: white;
    border-top-left-radius: 50px;
    border-top-right-radius: 50px;
}
.cta-section h2 {color: white; text-shadow: none; font-size: 3rem;}

footer {
    background: var(--primary-dark);
    color: white;
    padding: 30px 0;
    text-align: center;
}

/* Animations */
@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-15px); }
}

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(5deg); }
}

@keyframes scroll {
    0% { transform: translateX(0); }
    100% { transform: translateX(calc(-250px * 7 - 20px * 7)); }
}

@media (max-width: 768px) {
    .step-card {
        flex-direction: column;
        text-align: center;
    }
    .hero-title {
        font-size: 2.5rem;
    }
    .btn-group { flex-direction: column; align-items: center; }
}