:root {
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --bg-gradient: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    --glass: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --text: #f8fafc;
    --text-muted: #94a3b8;
}

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

body {
    background: var(--bg-gradient);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow-x: hidden;
}

#app {
    width: 100%;
    max-width: 1200px;
    padding: 20px;
}

.screen {
    animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.glass-card {
    background: var(--glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 40px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    margin-bottom: 20px;
}

h1, h2, h3 {
    margin-bottom: 20px;
    font-weight: 600;
    letter-spacing: -0.025em;
}

h1 { font-size: 2.5rem; text-align: center; }

input, select, button {
    width: 100%;
    padding: 14px 20px;
    margin-bottom: 16px;
    border-radius: 12px;
    border: 1px solid var(--glass-border);
    background: rgba(255, 255, 255, 0.03);
    color: white;
    font-size: 1rem;
    transition: all 0.3s ease;
}

input:focus, select:focus {
    outline: none;
    border-color: var(--primary);
    background: rgba(255, 255, 255, 0.08);
}

button {
    background: var(--primary);
    border: none;
    font-weight: 600;
    cursor: pointer;
}

button:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
}

button.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
}

button.btn-small {
    padding: 8px 16px;
    width: auto;
    font-size: 0.85rem;
}

a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

@media (max-width: 768px) {
    .grid { grid-template-columns: 1fr; }
    .glass-card { padding: 24px; }
}

.stats-item {
    background: rgba(255, 255, 255, 0.03);
    padding: 16px;
    border-radius: 16px;
    margin-bottom: 12px;
}

.progress-bar {
    height: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    margin-top: 8px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--primary);
    transition: width 0.5s ease;
}

.leaderboard-row {
    display: flex;
    justify-content: space-between;
    padding: 12px;
    border-bottom: 1px solid var(--glass-border);
}

hr {
    border: 0;
    border-top: 1px solid var(--glass-border);
    margin: 30px 0;
}