/* ===== CSS Variables & Design Tokens ===== */
:root {
    /* Colors */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --bg-primary: #0f0f1a;
    --bg-secondary: #1a1a2e;
    --bg-card: rgba(30, 30, 50, 0.8);
    --bg-glass: rgba(255, 255, 255, 0.05);

    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-muted: rgba(255, 255, 255, 0.5);

    --border-color: rgba(255, 255, 255, 0.1);

    /* Spacing */
    --spacing-md: 1rem;
    --spacing-xl: 2rem;

    /* Border Radius */
    --radius-lg: 16px;
    --radius-xl: 24px;

    /* Shadows */
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 40px rgba(102, 126, 234, 0.3);
}

/* ===== Reset & Base Styles ===== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 20% 20%, rgba(102, 126, 234, 0.15) 0%, transparent 40%),
    radial-gradient(circle at 80% 80%, rgba(118, 75, 162, 0.15) 0%, transparent 40%),
    radial-gradient(circle at 50% 50%, rgba(240, 147, 251, 0.05) 0%, transparent 60%);
    pointer-events: none;
    z-index: 0;
}

.container {
    position: relative;
    z-index: 1;
    max-width: 800px;
    width: 90%;
    margin: 0 auto;
    padding: var(--spacing-xl);
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-xl);
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.nav-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.nav-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    color: var(--text-primary);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    backdrop-filter: blur(20px);
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    box-shadow: var(--shadow-lg);
}

.nav-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
    border-color: rgba(102, 126, 234, 0.5);
    background: rgba(30, 30, 50, 0.95);
}

.icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    filter: drop-shadow(0 0 10px rgba(255, 255, 255, 0.2));
}

.title {
    font-size: 1.1rem;
    font-weight: 600;
    text-align: center;
}

footer {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-top: 3rem;
}