:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --secondary-color: #ec4899;
    --bg-color: #0f172a;
    --card-bg: rgba(30, 41, 59, 0.7);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border-color: rgba(148, 163, 184, 0.1);
    --glass-border: 1px solid rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --sidebar-width: 260px;
    --header-height: 70px;
    --transition-speed: 0.3s;
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    background-image:
        radial-gradient(circle at 15% 50%, rgba(99, 102, 241, 0.15) 0%, transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(236, 72, 153, 0.15) 0%, transparent 25%);
    min-height: 100vh;
    overflow-x: hidden;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 0.5rem;
}

a {
    text-decoration: none;
    color: var(--primary-color);
    transition: var(--transition-speed);
}

a:hover {
    color: var(--primary-hover);
}

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

.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: 2rem;
    transition: margin-left var(--transition-speed);
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    height: 100vh;
    position: fixed;
    top: 0;
    left: 0;
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-right: var(--glass-border);
    display: flex;
    flex-direction: column;
    z-index: 1000;
}

.sidebar-header {
    height: var(--header-height);
    display: flex;
    align-items: center;
    padding: 0 1.5rem;
    border-bottom: var(--glass-border);
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sidebar-nav {
    flex: 1;
    padding: 1.5rem 0;
    overflow-y: auto;
}

.nav-item {
    display: flex;
    align-items: center;
    padding: 0.8rem 1.5rem;
    color: var(--text-muted);
    font-weight: 500;
    transition: var(--transition-speed);
    border-left: 3px solid transparent;
}

.nav-item i {
    width: 24px;
    margin-right: 0.8rem;
    font-size: 1.1rem;
}

.nav-item:hover,
.nav-item.active {
    color: var(--text-main);
    background: rgba(99, 102, 241, 0.1);
    border-left-color: var(--primary-color);
}

.sidebar-footer {
    padding: 1rem 1.5rem;
    border-top: var(--glass-border);
}

/* Cards */
.card {
    background: var(--card-bg);
    border: var(--glass-border);
    border-radius: 12px;
    padding: 1.5rem;
    backdrop-filter: blur(12px);
    box-shadow: var(--glass-shadow);
    margin-bottom: 1.5rem;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    border-bottom: var(--glass-border);
    padding-bottom: 1rem;
}

.card-header h3 {
    margin: 0;
    font-size: 1.25rem;
}

/* Utilities */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.6rem 1.2rem;
    border-radius: 8px;
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: var(--transition-speed);
    gap: 0.5rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

.btn-danger {
    background: linear-gradient(135deg, #ef4444, #b91c1c);
    color: white;
}

/* Login Page */
.login-container {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.login-card {
    width: 100%;
    max-width: 400px;
    padding: 2.5rem;
    text-align: center;
}

.login-header {
    margin-bottom: 2rem;
}

.form-group {
    margin-bottom: 1.5rem;
    text-align: left;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.form-control {
    width: 100%;
    padding: 0.8rem 1rem;
    background: rgba(15, 23, 42, 0.5);
    border: var(--glass-border);
    border-radius: 8px;
    color: var(--text-main);
    font-family: inherit;
    transition: var(--transition-speed);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.2);
}

/* Alerts */
.alert {
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
}

.alert-error {
    background: rgba(239, 68, 68, 0.1);
    color: #fca5a5;
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.alert-success {
    background: rgba(34, 197, 94, 0.1);
    color: #86efac;
    border: 1px solid rgba(34, 197, 94, 0.2);
}

/* Grid System */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

/* Status Badges */
.badge {
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.badge-success {
    background: rgba(34, 197, 94, 0.2);
    color: #4ade80;
}

.badge-warning {
    background: rgba(234, 179, 8, 0.2);
    color: #fde047;
}

.badge-danger {
    background: rgba(239, 68, 68, 0.2);
    color: #fca5a5;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        transition: transform var(--transition-speed);
    }

    .main-content {
        margin-left: 0;
    }

    .mobile-menu-open .sidebar {
        transform: translateX(0);
    }
}