@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    --primary: #10b981;
    --primary-hover: #059669;
    --bg-main: #0f172a;
    --bg-surface: rgba(30, 41, 59, 0.7);
    --surface-border: rgba(255, 255, 255, 0.1);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --danger: #ef4444;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background-image: 
        radial-gradient(at 0% 0%, rgba(16, 185, 129, 0.15) 0, transparent 50%), 
        radial-gradient(at 100% 100%, rgba(16, 185, 129, 0.1) 0, transparent 50%);
    background-attachment: fixed;
}

/* Glassmorphism containers */
.glass-panel {
    background: var(--bg-surface);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--surface-border);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.glass-panel:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 35px rgba(0,0,0,0.6);
}

/* Typography */
h1, h2, h3 {
    font-weight: 600;
    margin-bottom: 1rem;
}

.gradient-text {
    background: linear-gradient(135deg, #10b981 0%, #34d399 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Auth Layout */
.auth-container {
    width: 100%;
    max-width: 400px;
    margin: auto;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 2rem;
}

/* Dashboard Layout */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 5%;
    border-bottom: 1px solid var(--surface-border);
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-brand {
    font-size: 1.25rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
    cursor: pointer;
}

.nav-links a:hover, .nav-links a.active {
    color: var(--primary);
}

.main-content {
    padding: 3rem 5%;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

@media (min-width: 768px) {
    .main-content {
        grid-template-columns: 2fr 1fr;
    }
}

/* Forms & Inputs */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-muted);
}

input[type="text"], input[type="password"], input[type="email"], input[type="number"], input[type="date"], select {
    width: 100%;
    padding: 0.75rem 1rem;
    background: rgba(0,0,0,0.2);
    border: 1px solid var(--surface-border);
    border-radius: 8px;
    color: var(--text-main);
    font-family: inherit;
    transition: all 0.2s ease;
}

input:focus, select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(16, 185, 129, 0.2);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all 0.2s ease;
    text-align: center;
    width: 100%;
    font-family: inherit;
}

.btn-primary {
    background: var(--primary);
    color: #fff;
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--primary);
    color: var(--primary);
}

.btn-outline:hover {
    background: rgba(16, 185, 129, 0.1);
}

/* Dashboard Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--surface-border);
    border-radius: 12px;
    padding: 1.5rem;
    text-align: center;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 0.25rem;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* Leaderboard */
.leaderboard-list {
    list-style: none;
}

.leaderboard-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
    border-bottom: 1px solid var(--surface-border);
}

.leaderboard-item:last-child {
    border-bottom: none;
}

.rank-1 { color: #fbbf24; font-weight: bold; }
.rank-2 { color: #94a3b8; font-weight: bold; }
.rank-3 { color: #b45309; font-weight: bold; }

/* Utilities */
.hidden { display: none !important; }
.text-center { text-align: center; }
.mt-4 { margin-top: 1rem; }
.mb-4 { margin-bottom: 1rem; }
.error-msg { color: var(--danger); font-size: 0.875rem; margin-top: 0.5rem; }