/* Futuristic CSS for Kool Math Tutor - Bleeding Edge Design */

/* CSS Variables for Theme */
:root {
    --primary-bg: #0a0a0a;
    --secondary-bg: rgba(255, 255, 255, 0.05);
    --accent: #00ffff;
    --accent-hover: #ff00ff;
    --text-primary: #ffffff;
    --text-secondary: #cccccc;
    --shadow: 0 0 20px rgba(0, 255, 255, 0.3);
    --border-radius: 15px;
    --transition: all 0.3s ease;
}

/* Reset and base styles */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: linear-gradient(135deg, var(--primary-bg) 0%, #1a1a1a 100%);
    min-height: 100vh;
    overflow-x: hidden;
    animation: fadeIn 1s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

header {
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--accent);
    padding: 1rem;
    text-align: center;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

header h1 {
    margin-bottom: 0.5rem;
    background: linear-gradient(45deg, var(--accent), var(--accent-hover));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 2.5rem;
    font-weight: 700;
    text-shadow: 0 0 10px var(--accent);
    animation: glow 2s ease-in-out infinite alternate;
}

@keyframes glow {
    from { text-shadow: 0 0 10px var(--accent); }
    to { text-shadow: 0 0 20px var(--accent), 0 0 30px var(--accent); }
}

nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1rem;
}

nav li {
    position: relative;
}

nav a {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
    font-weight: 500;
    position: relative;
}

nav a:hover {
    color: var(--accent);
    text-shadow: 0 0 10px var(--accent);
    background: linear-gradient(135deg, rgba(0, 255, 255, 0.1), rgba(255, 0, 255, 0.1));
}

main {
    padding: 2rem 1rem;
    max-width: 1200px;
    margin: 0 auto;
}

section {
    margin-bottom: 2rem;
    background: var(--secondary-bg);
    backdrop-filter: blur(20px);
    padding: 2rem;
    border-radius: var(--border-radius);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

section::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: conic-gradient(from 0deg, transparent, var(--accent), transparent);
    opacity: 0;
    transition: opacity 0.5s;
    animation: rotate 10s linear infinite;
}

section:hover::before {
    opacity: 0.1;
}

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

h2 {
    color: var(--accent);
    margin-bottom: 1rem;
    font-size: 2rem;
    font-weight: 600;
    position: relative;
}

h2::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 50px;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--accent-hover));
    border-radius: 2px;
}

ul {
    list-style: none;
    padding: 0;
}

ul li {
    padding: 0.5rem 0;
    position: relative;
    padding-left: 1.5rem;
}

ul li::before {
    content: '▶';
    position: absolute;
    left: 0;
    color: var(--accent);
    font-size: 0.8rem;
}

a {
    color: var(--accent);
    transition: var(--transition);
}

a:hover {
    color: var(--accent-hover);
    text-shadow: 0 0 5px var(--accent-hover);
}

footer {
    background: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(10px);
    color: var(--text-secondary);
    text-align: center;
    padding: 1.5rem;
    border-top: 1px solid var(--accent);
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
}

footer p {
    margin: 0;
}

/* Tablet and larger screens */
@media (min-width: 768px) {
    header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        text-align: left;
        padding: 1.5rem 2rem;
    }

    header h1 {
        margin-bottom: 0;
        font-size: 3rem;
    }

    nav ul {
        flex-wrap: nowrap;
        gap: 2rem;
    }

    main {
        padding: 3rem 2rem;
    }

    section {
        padding: 3rem;
    }

    h2 {
        font-size: 2.5rem;
    }
}

/* Desktop screens */
@media (min-width: 1024px) {
    body {
        font-size: 1.1rem;
    }

    main {
        display: grid;
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    section {
        margin-bottom: 0;
    }
}