:root {
    --bg: #0f172a;
    --primary: #8b5cf6;
    --secondary: #ec4899;
    --text: #ffffff;
    --text-muted: #94a3b8;
    --glass: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --card-bg: rgba(30, 41, 59, 0.7);
    --hover: rgba(255, 255, 255, 0.1);
    --font: 'Inter', sans-serif;
}

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

body {
    font-family: var(--font);
    background: linear-gradient(135deg, #1e1e2f 0%, #16213e 100%);
    color: var(--text);
    height: 100vh;
    overflow: hidden;
}

/* Glass Effect */
.glass {
    background: var(--glass);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

/* Layout */
#app {
    display: flex;
    height: 100%;
}

/* Login Screen */
#login-section {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    background: rgba(0,0,0,0.8);
    z-index: 1000;
}

.login-container {
    padding: 2rem;
    width: 350px;
    text-align: center;
}

.login-container h1 {
    margin-bottom: 2rem;
    color: var(--primary);
}

input {
    width: 100%;
    padding: 0.8rem;
    margin-bottom: 1rem;
    background: rgba(0,0,0,0.3);
    border: 1px solid var(--glass-border);
    color: white;
    border-radius: 6px;
    font-size: 1rem;
}

.btn-primary {
    width: 100%;
    padding: 0.8rem;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    border: none;
    color: white;
    border-radius: 6px;
    cursor: pointer;
    font-weight: bold;
    transition: transform 0.2s;
}

.btn-primary:hover {
    transform: scale(1.05);
}

/* Sidebar */
.sidebar {
    width: 250px;
    margin: 1rem;
    display: flex;
    flex-direction: column;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    padding: 1.5rem;
    color: var(--primary);
    text-align: center;
}

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

.sidebar li {
    padding: 1rem 1.5rem;
    cursor: pointer;
    transition: background 0.2s;
    color: var(--text-muted);
}

.sidebar li:hover, .sidebar li.active {
    background: var(--hover);
    color: var(--text);
    border-left: 3px solid var(--primary);
}

.logout-btn {
    margin-top: auto;
    color: #ef4444 !important;
}

/* Main Content */
.content {
    flex: 1;
    padding: 1rem;
    overflow-y: auto;
    position: relative;
}

.page {
    display: none;
    animation: fadeIn 0.3s ease-out;
}

.page.active {
    display: block;
}

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

h2 {
    margin-bottom: 1.5rem;
    font-size: 2rem;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    padding: 1.5rem;
    text-align: center;
}

.stat-card h3 {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.stat-card .value {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--text);
}

.stat-card .value.error {
    color: #ef4444;
}

/* Tables */
.table-container {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--glass-border);
}

th {
    color: var(--text-muted);
    font-weight: 600;
}

tr:hover {
    background: rgba(255,255,255,0.02);
}

/* Utilities */
.hidden {
    display: none !important;
}

.error-msg {
    color: #ef4444;
    margin-top: 1rem;
    font-size: 0.9rem;
}

select {
    background: #1e293b;
    color: white;
    border: 1px solid #334155;
    padding: 0.3rem;
    border-radius: 4px;
}