:root {
    --primary: #ef4444;
    --primary-glow: rgba(239, 68, 68, 0.4);
    --bg-dark: #0f172a;
    --text-main: #f8fafc;
    --glass-bg: rgba(15, 23, 42, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Outfit', sans-serif;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-image: 
        radial-gradient(circle at 50% 0%, var(--primary-glow) 0%, transparent 50%),
        linear-gradient(to bottom, #0f172a, #020617);
    overflow-x: hidden;
    overflow-y: auto;
}

.container {
    width: 100%;
    max-width: 1200px;
    padding: 2rem;
    position: relative;
    z-index: 10;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4rem;
}

.back-button {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-main);
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: 500;
    padding: 0.75rem 1.25rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: all 0.3s ease;
    z-index: 20;
}

.back-button:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateX(-5px);
    border-color: var(--primary);
    color: var(--primary);
}

.back-button svg {
    transition: transform 0.3s ease;
}

.back-button:hover svg {
    transform: translateX(-3px);
}

header {
    text-align: center;
}

h1 {
    font-size: 4rem;
    font-weight: 900;
    letter-spacing: -2px;
    color: white;
    text-shadow: 0 0 20px var(--primary-glow);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
}

.subtitle {
    font-size: 1.2rem;
    color: #94a3b8;
    font-weight: 300;
    letter-spacing: 2px;
    text-transform: uppercase;
}

.mode-selector {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    width: 100%;
}

.mode-card {
    text-decoration: none;
    color: white;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 2rem;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    cursor: pointer;
}

.mode-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.05), transparent);
    transition: left 0.5s ease;
}

.mode-card:hover::before {
    left: 100%;
}

.mode-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary);
    box-shadow: 0 10px 30px -10px var(--primary-glow);
}

.mode-card.featured {
    border-color: rgba(239, 68, 68, 0.5);
    background: rgba(239, 68, 68, 0.05);
}

.mode-card h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: #f8fafc;
}

.mode-card.featured h2 {
    color: var(--primary);
}

.mode-card p {
    color: #cbd5e1;
    line-height: 1.6;
    font-weight: 300;
}

footer {
    text-align: center;
    color: #64748b;
    font-size: 0.9rem;
}

/* Glitch Effect */
.glitch {
    position: relative;
}
.glitch::before, .glitch::after {
    content: attr(data-text);
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.8;
}
.glitch::before {
    left: 2px;
    text-shadow: -2px 0 red;
    clip: rect(44px, 450px, 56px, 0);
    animation: glitch-anim 5s infinite linear alternate-reverse;
}
.glitch::after {
    left: -2px;
    text-shadow: -2px 0 blue;
    clip: rect(44px, 450px, 56px, 0);
    animation: glitch-anim2 5s infinite linear alternate-reverse;
}
@keyframes glitch-anim {
    0% { clip: rect(21px, 9999px, 86px, 0); }
    20% { clip: rect(10px, 9999px, 30px, 0); }
    40% { clip: rect(61px, 9999px, 12px, 0); }
    60% { clip: rect(98px, 9999px, 56px, 0); }
    80% { clip: rect(43px, 9999px, 20px, 0); }
    100% { clip: rect(54px, 9999px, 90px, 0); }
}
@keyframes glitch-anim2 {
    0% { clip: rect(65px, 9999px, 100px, 0); }
    20% { clip: rect(2px, 9999px, 75px, 0); }
    40% { clip: rect(32px, 9999px, 40px, 0); }
    60% { clip: rect(89px, 9999px, 15px, 0); }
    80% { clip: rect(22px, 9999px, 55px, 0); }
    100% { clip: rect(45px, 9999px, 10px, 0); }
}

/* Responsive */
@media (max-width: 768px) {
    h1 { font-size: 2.5rem; }
    .mode-selector { grid-template-columns: 1fr; }
    
    body {
        align-items: flex-start; /* Fixes top content cutoff when scrolling */
    }
    
    .container {
        padding: 1.5rem;
        padding-bottom: 4rem;
        gap: 2rem;
    }
}