:root {
    --primary: #0ea5e9;
    --primary-dark: #0284c7;
    --secondary: #64748b;
    --bg-main: #f8fafc;
    --card-bg: #ffffff;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --danger: #ef4444;
    --success: #22c55e;
    --warning: #f59e0b;
    --sidebar-bg: #ffffff;
    --header-bg: rgba(255, 255, 255, 0.8);
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
}

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

body {
    background-color: var(--bg-main);
    color: var(--text-main);
    font-family: var(--font-sans);
    line-height: 1.5;
    overflow-x: hidden;
}

/* Auth Pages */
.auth-wrapper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    padding: 20px;
}

.auth-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    padding: 40px;
    border-radius: 24px;
    width: 100%;
    max-width: 450px;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.05), 0 10px 10px -5px rgba(0, 0, 0, 0.02);
    animation: fadeIn 0.6s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.brand-header {
    text-align: center;
    margin-bottom: 32px;
}

.brand-header h1 {
    font-size: 2.25rem;
    font-weight: 800;
    letter-spacing: -0.025em;
    color: var(--primary);
}

.brand-header p {
    color: var(--text-muted);
    margin-top: 8px;
    font-weight: 500;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-main);
}

.form-input {
    width: 100%;
    background: #f1f5f9;
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 12px 16px;
    color: var(--text-main);
    font-size: 1rem;
    transition: all 0.2s;
}

.form-input:focus {
    outline: none;
    background: white;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(14, 165, 233, 0.1);
}

.btn {
    width: 100%;
    padding: 12px;
    border-radius: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
    font-size: 1rem;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(14, 165, 233, 0.2);
}

.error-alert {
    background: #fef2f2;
    border: 1px solid #fee2e2;
    color: var(--danger);
    padding: 12px;
    border-radius: 12px;
    margin-bottom: 20px;
    font-size: 0.875rem;
    font-weight: 500;
}

/* Layout */
.layout-container {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 280px;
    background: var(--sidebar-bg);
    border-right: 1px solid var(--border);
    padding: 24px;
    display: flex;
    flex-direction: column;
}

.main-content {
    flex: 1;
    padding: 32px;
    background: var(--bg-main);
    max-height: 100vh;
    overflow-y: auto;
}

/* Dashboard Widgets */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
    margin-bottom: 32px;
}

.stat-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    padding: 24px;
    border-radius: 20px;
    transition: all 0.2s;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 20px -8px rgba(0,0,0,0.1);
}

.stat-card .label {
    color: var(--text-muted);
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.stat-card .value {
    font-size: 2.25rem;
    font-weight: 800;
    margin-top: 8px;
    display: block;
    color: var(--text-main);
}

.dashboard-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 24px;
}

.content-box {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 24px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.content-box h3 {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-main);
}

/* Table Styles */
table {
    width: 100%;
    border-collapse: collapse;
}

th {
    text-align: left;
    color: var(--text-muted);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 12px 16px;
    border-bottom: 2px solid var(--bg-main);
}

td {
    padding: 16px;
    border-bottom: 1px solid var(--border);
    font-size: 0.875rem;
    color: var(--text-main);
}

.badge {
    padding: 4px 10px;
    border-radius: 99px;
    font-size: 0.75rem;
    font-weight: 700;
}

.badge-success { background: #dcfce7; color: #166534; }
.badge-warning { background: #fef9c3; color: #854d0e; }
.badge-danger { background: #fee2e2; color: #991b1b; }
.badge-info { background: #e0f2fe; color: #075985; }

/* Sidebar Nav */
.nav-link {
    display: block;
    padding: 12px 16px;
    border-radius: 12px;
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.2s;
    margin-bottom: 4px;
}

.nav-link:hover {
    background: #f1f5f9;
    color: var(--primary);
}

.nav-link.active {
    background: #e0f2fe;
    color: var(--primary);
}