:root {
    --primary: #4F46E5;
    --primary-hover: #4338CA;
    --secondary: #10B981;
    --background: #0F172A;
    --surface: #1E293B;
    --surface-hover: #334155;
    --surface-glass: rgba(30, 41, 59, 0.7);
    --text-primary: #F8FAFC;
    --text-secondary: #94A3B8;
    --border: #334155;
    --danger: #EF4444;
    --success: #10B981;
    --radius: 12px;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
}

[data-theme="light"] {
    --primary: #4F46E5;
    --primary-hover: #4338CA;
    --secondary: #10B981;
    --background: #F1F5F9;
    --surface: #FFFFFF;
    --surface-hover: #F8FAFC;
    --surface-glass: rgba(255, 255, 255, 0.8);
    --text-primary: #0F172A;
    --text-secondary: #64748B;
    --border: #E2E8F0;
    --danger: #EF4444;
    --success: #10B981;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
    background-color: var(--background);
    color: var(--text-primary);
    line-height: 1.5;
    display: flex;
    min-height: 100vh;
}

/* Layout */
.sidebar {
    width: 280px;
    background-color: var(--surface);
    border-right: 1px solid var(--border);
    padding: 2rem 1rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    padding: 0 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.brand span {
    color: var(--primary);
}

.nav-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.nav-item {
    text-decoration: none;
    color: var(--text-secondary);
    padding: 0.75rem 1rem;
    border-radius: var(--radius);
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 500;
}

.nav-item:hover, .nav-item.active {
    background-color: var(--surface-hover);
    color: var(--text-primary);
}

.nav-item.active {
    background-color: rgba(79, 70, 229, 0.1);
    color: var(--primary);
}

.main-content {
    flex: 1;
    padding: 2rem 3rem;
    overflow-y: auto;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

h1 {
    font-size: 1.875rem;
    font-weight: 600;
}

/* Cards (Glassmorphism) */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.card {
    background: var(--surface-glass);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.card-title {
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.card-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* Tables */
.table-container {
    background-color: var(--surface);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    overflow: hidden;
}

table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

th {
    background-color: rgba(0,0,0,0.2);
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.875rem;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border);
}

td {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border);
    color: var(--text-primary);
}

tr:last-child td {
    border-bottom: none;
}

tr:hover td {
    background-color: var(--surface-hover);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-weight: 500;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
    text-decoration: none;
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: scale(1.02);
}

/* Badges */
.badge {
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 500;
}

.badge-success {
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--success);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.badge-danger {
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

/* Login Form */
.login-container { display: flex; align-items: center; justify-content: center; height: 100vh; width: 100%; background: var(--background); }
.login-card { background: var(--surface-glass); padding: 2.5rem; border-radius: var(--radius); box-shadow: var(--shadow-lg); width: 100%; max-width: 400px; border: 1px solid var(--border); }
.login-card h2 { margin-bottom: 1.5rem; text-align: center; color: var(--text-primary); }
.form-group { margin-bottom: 1.25rem; }
.form-label { display: block; margin-bottom: 0.5rem; font-size: 0.875rem; color: var(--text-secondary); }
.form-control { width: 100%; padding: 0.75rem 1rem; background: var(--surface); border: 1px solid var(--border); border-radius: 8px; color: var(--text-primary); transition: border-color 0.2s; }
.form-control:focus { outline: none; border-color: var(--primary); }
.btn-block { width: 100%; padding: 0.75rem; font-size: 1rem; margin-top: 1rem; }
.alert { padding: 1rem; border-radius: 8px; margin-bottom: 1.5rem; font-size: 0.875rem; }
.alert-danger { background: rgba(239, 68, 68, 0.1); color: var(--danger); border: 1px solid rgba(239, 68, 68, 0.2); }