:root {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --admin-color: #f43f5e;
    --user-color: #10b981;
    --success: #10b981;
    --error: #ef4444;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Navbar */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background: rgba(30, 41, 59, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.nav-brand {
    font-size: 1.25rem;
    font-weight: 800;
    letter-spacing: 1px;
}

.nav-links {
    display: flex;
    gap: 1rem;
}

.nav-btn {
    text-decoration: none;
    color: var(--text-main);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    transition: all 0.2s ease;
    background: rgba(255,255,255,0.05);
}
.nav-btn:hover { background: rgba(255,255,255,0.1); }
.btn-admin { border: 1px solid var(--admin-color); color: var(--admin-color); }
.btn-logout { background: rgba(239, 68, 68, 0.2); color: var(--error); }

/* Container */
.container {
    max-width: 1000px;
    margin: 2rem auto;
    padding: 0 1rem;
    width: 100%;
}

/* Cards & Forms */
.card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(255,255,255,0.05);
    margin-bottom: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 1.5rem;
}

label { font-size: 0.875rem; color: var(--text-muted); font-weight: 600; }

input, select {
    background: rgba(0,0,0,0.2);
    border: 1px solid rgba(255,255,255,0.1);
    color: white;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.2s;
}
input:focus, select:focus {
    outline: none;
    border-color: var(--accent);
}

.btn-primary {
    background: var(--accent);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.2s;
    margin-top: 0.5rem;
}
.btn-primary:hover { background: var(--accent-hover); }

/* Utilities */
.highlight { color: var(--accent); }
.badge {
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 800;
}
.badge.admin { background: rgba(244, 63, 94, 0.2); color: var(--admin-color); }
.badge.user { background: rgba(16, 185, 129, 0.2); color: var(--user-color); }

/* Flash Messages */
.flash {
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    font-weight: 600;
}
.flash.success { background: rgba(16, 185, 129, 0.2); color: var(--success); border: 1px solid var(--success); }
.flash.error { background: rgba(239, 68, 68, 0.2); color: var(--error); border: 1px solid var(--error); }

/* Animations */
.fade-in { animation: fadeIn 0.4s ease-out; }
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.glow-on-hover:hover {
    box-shadow: 0 0 15px var(--accent);
}

/* Dashboard / Tables */
.admin-layout {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 1.5rem;
}

.user-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}
.user-table th, .user-table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}
.user-table th { color: var(--text-muted); font-size: 0.875rem; }

.dashboard-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-top: 2rem; }
.stat-card h3 { color: var(--text-muted); font-size: 0.875rem; margin-bottom: 0.5rem; }
.stat-card p { font-size: 1.5rem; font-weight: 800; }
.status-online { color: var(--success); }

.profile-layout {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 2rem;
}

.table-responsive {
    overflow-x: auto;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        align-items: center;
        padding: 1rem;
    }
    
    .nav-brand {
        margin-bottom: 1rem;
    }
    
    .nav-links {
        flex-direction: column;
        width: 100%;
        gap: 0.5rem;
    }
    
    .nav-btn {
        width: 100%;
        text-align: center;
    }
    
    .admin-layout, .profile-layout {
        grid-template-columns: 1fr;
    }
    
    .dashboard-cards {
        grid-template-columns: 1fr;
    }
    
    .card {
        padding: 1.5rem 1rem;
    }
}