:root {
    --bg-dark: 220 15% 10%;
    --primary: 260 100% 65%;
    --primary-glow: 260 100% 75%;
    --secondary: 190 100% 50%;
    --text-main: 220 10% 95%;
    --text-muted: 220 10% 70%;
    --glass-bg: 220 15% 15% / 0.6;
    --glass-border: 255 255 255 / 0.1;
    
    --font-main: 'Outfit', sans-serif;
}

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

body {
    background-color: hsl(var(--bg-dark));
    color: hsl(var(--text-main));
    font-family: var(--font-main);
    min-height: 100vh;
    overflow-x: hidden;
}

.background-gradient {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: 
        radial-gradient(circle at 10% 20%, hsl(var(--primary) / 0.2) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, hsl(var(--secondary) / 0.15) 0%, transparent 40%);
    z-index: -1;
}

.app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

/* Header */
.glass-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2.5rem;
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    margin-bottom: 4rem;
}

.logo {
    font-weight: 700;
    font-size: 1.5rem;
    letter-spacing: -0.02em;
}

/* Hero */
.hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    min-height: 60vh;
}

.badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: hsl(var(--primary) / 0.2);
    color: hsl(var(--primary-glow));
    border-radius: 100px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

h2 {
    font-size: 4rem;
    line-height: 1.1;
    margin-bottom: 1.5rem;
}

.gradient-text {
    background: linear-gradient(135deg, hsl(var(--primary-glow)), hsl(var(--secondary)));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    color: hsl(var(--text-muted));
    font-size: 1.125rem;
    line-height: 1.6;
    margin-bottom: 2.5rem;
    max-width: 90%;
}

.action-buttons {
    display: flex;
    gap: 1rem;
}

/* Buttons */
button {
    cursor: pointer;
    font-family: inherit;
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn-primary {
    background: hsl(var(--primary));
    color: white;
    border: none;
    padding: 1rem 2rem;
    border-radius: 12px;
}

.btn-primary.glow {
    box-shadow: 0 0 20px hsl(var(--primary) / 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    background: hsl(var(--primary-glow));
}

.btn-secondary {
    background: transparent;
    color: hsl(var(--text-main));
    border: 1px solid var(--glass-border);
    padding: 1rem 2rem;
    border-radius: 12px;
}

.btn-secondary:hover {
    background: var(--glass-border);
}

/* Visual */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 2rem;
    height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.class-card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, hsl(var(--primary) / 0.1) 0%, transparent 60%);
    animation: rotate 10s linear infinite;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.quiz-stat {
    position: relative;
    z-index: 1;
    text-align: center;
}

.quiz-stat .value {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: hsl(var(--primary-glow));
}