:root {
    --bg: #ffffff;
    --surface: #f8fafc;
    --primary: #0f172a;
    --accent: #2563eb;
    --accent-dark: #1e40af;
    --accent-light: #eff6ff;
    --text: #0f172a;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --border-hover: #cbd5e1;
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 32px;
}

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

body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg);
    color: var(--text);
    overflow-x: hidden;
    scroll-behavior: smooth;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* Premium Glow Background */
.glow-bg {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: 
        radial-gradient(circle at 100% 0%, rgba(37, 99, 235, 0.03) 0%, transparent 40%),
        radial-gradient(circle at 0% 100%, rgba(37, 99, 235, 0.03) 0%, transparent 40%);
    z-index: -1;
}

/* Animations */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s cubic-bezier(0.2, 1, 0.3, 1);
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* Navbar */
.navbar {
    height: 80px;
    display: flex;
    align-items: center;
    position: fixed;
    top: 0; width: 100%;
    z-index: 1000;
    border-bottom: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.navbar .container { display: flex; justify-content: space-between; align-items: center; width: 100%; }

.logo { display: flex; align-items: center; gap: 12px; font-weight: 800; font-size: 1.4rem; color: var(--primary); letter-spacing: -0.02em; }
.logo span span { color: var(--accent); }
.diamond-icon { color: var(--accent); filter: drop-shadow(0 0 10px var(--accent-light)); }

.nav-links { display: flex; gap: 40px; align-items: center; }
.nav-links a { text-decoration: none; color: var(--text-muted); font-size: 0.95rem; font-weight: 500; transition: 0.2s; }
.nav-links a:hover { color: var(--accent); }

.btn-login {
    background: var(--primary) !important;
    color: white !important;
    padding: 10px 24px;
    border-radius: 100px;
    font-size: 0.9rem;
    font-weight: 600;
    transition: 0.3s;
}
.btn-login:hover { transform: scale(1.05); }

/* Hero Section */
.hero { padding: 160px 0 100px; text-align: left; }
.hero .container { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 60px; align-items: center; }
.hero h1 { font-size: 3.8rem; font-weight: 800; line-height: 1.1; margin-bottom: 24px; letter-spacing: -0.04em; }
.hero h1 { font-size: 3.2rem; font-weight: 800; line-height: 1.1; margin-bottom: 24px; letter-spacing: -0.04em; }
.text-gradient { 
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p { font-size: 1.2rem; color: var(--text-muted); margin-bottom: 40px; max-width: 540px; font-weight: 400; }
.hero-actions { display: flex; gap: 20px; justify-content: flex-start; }

.btn-primary {
    background: var(--accent);
    color: white;
    padding: 20px 48px;
    border-radius: 100px;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.1rem;
    transition: 0.3s cubic-bezier(0.2, 1, 0.3, 1);
    box-shadow: 0 10px 30px var(--accent-glow);
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 15px 40px var(--accent-glow); }

.btn-secondary {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--primary);
    text-decoration: none;
    font-weight: 700;
    font-size: 1.1rem;
}

/* Section Tag */
.section-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: var(--accent-light);
    color: var(--accent);
    border-radius: 100px;
    font-size: 0.8rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 24px;
}

/* Feature Grid */
.features { padding: 120px 0; }
.features h2 { font-size: 3.5rem; font-weight: 800; margin-bottom: 80px; letter-spacing: -0.03em; }

.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.f-card {
    padding: 56px 40px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    background: white;
    transition: 0.4s cubic-bezier(0.2, 1, 0.3, 1);
}
.f-card:hover { border-color: var(--accent); transform: translateY(-10px); box-shadow: 0 40px 80px rgba(0,0,0,0.05); }
.f-icon { color: var(--accent); margin-bottom: 32px; width: 48px; height: 48px; }
.f-card h3 { font-size: 1.6rem; margin-bottom: 16px; font-weight: 700; }
.f-card p { color: var(--text-muted); font-size: 1.1rem; }

/* How It Works (Deep Dive) */
.how-it-works { padding: 120px 0; background: var(--surface); border-radius: var(--radius-lg); margin: 0 24px; }
.steps-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 40px; margin-top: 80px; }
.step-item { position: relative; }
.step-num { font-size: 5rem; font-weight: 900; color: rgba(37, 99, 235, 0.05); position: absolute; top: -30px; left: 0; }
.step-content { position: relative; z-index: 1; }
.step-content h4 { font-size: 1.25rem; font-weight: 800; margin-bottom: 12px; color: var(--primary); }
.step-content p { font-size: 1rem; color: var(--text-muted); }

/* CTA Box */
.cta-section { padding: 120px 0; }
.cta-box {
    background: var(--primary);
    padding: 100px 48px;
    border-radius: var(--radius-lg);
    color: white;
    text-align: center;
    position: relative;
    overflow: hidden;
}
.cta-box h2 { font-size: 3.5rem; font-weight: 800; margin-bottom: 24px; color: white; }
.cta-box p { font-size: 1.4rem; color: rgba(255, 255, 255, 0.7); margin-bottom: 48px; max-width: 700px; margin-inline: auto; }

/* Footer */
.footer { padding: 120px 0 60px; border-top: 1px solid var(--border); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px; margin-bottom: 80px; }
.footer-info p { margin-top: 24px; color: var(--text-muted); max-width: 320px; }
.footer-links h4 { font-size: 0.9rem; font-weight: 800; margin-bottom: 24px; color: var(--primary); text-transform: uppercase; letter-spacing: 0.05em; }
.footer-links a { display: block; margin-bottom: 16px; color: var(--text-muted); text-decoration: none; font-size: 0.95rem; }
.footer-links a:hover { color: var(--accent); }

@media (max-width: 1024px) {
    .hero h1 { font-size: 3.5rem; }
    .hero .container { gap: 40px; }
}

@media (max-width: 768px) {
    .navbar { height: 72px; }
    .nav-links { display: none; } /* Hamburger menu can be implemented if needed */
    
    .hero { padding: 120px 0 60px; text-align: center; }
    .hero .container { grid-template-columns: 1fr; gap: 48px; }
    .hero h1 { font-size: 2.8rem; }
    .hero p { margin-inline: auto; font-size: 1.1rem; }
    .hero-actions { justify-content: center; flex-direction: column; width: 100%; max-width: 320px; margin: 0 auto; }
    .btn-primary { width: 100%; padding: 16px 32px; }
    .btn-secondary { justify-content: center; }
    
    .hero-visual-box { transform: none !important; margin: 0 auto; width: 100%; max-width: 400px; }
    
    .section-title { font-size: 2.4rem; margin-bottom: 40px; }
    .features-grid { grid-template-columns: 1fr; gap: 20px; }
    .f-card { padding: 32px 24px; }
    
    .steps-grid { grid-template-columns: 1fr; gap: 48px; margin-top: 40px; }
    .step-num { font-size: 3.5rem; top: -20px; }
    
    #akademi > div { 
        grid-template-columns: 1fr; 
        padding: 40px 24px; 
        gap: 48px; 
        text-align: center;
    }
    #akademi ul { text-align: left; }
    #akademi h2 { font-size: 2rem; }
    
    .cta-box { padding: 60px 24px; }
    .cta-box h2 { font-size: 2.2rem; }
    .cta-box p { font-size: 1.1rem; }
    
    .footer-grid { grid-template-columns: 1fr; gap: 40px; text-align: center; }
    .footer-info { display: flex; flex-direction: column; align-items: center; }
    .footer-bottom { flex-direction: column; gap: 20px; text-align: center; }
}

@media (max-width: 480px) {
    .hero h1 { font-size: 2.2rem; }
    .section-title { font-size: 2rem; }
    .container { padding: 0 20px; }
}