:root {
    --primary-color: #4361ee;
    --secondary-color: #3f37c9;
    --success-color: #4cc9f0;
    --danger-color: #f72585;
    --warning-color: #f8961e;
    --dark-color: #2b2d42;
    --light-color: #f8f9fa;
    --gray-color: #8d99ae;
    --bg-color: #f0f2f5;
    --card-bg: rgba(255, 255, 255, 0.9);
    --border-radius: 12px;
    --box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.1);
    --glass-border: 1px solid rgba(255, 255, 255, 0.18);
}

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

body {
    background-color: var(--bg-color);
    color: var(--dark-color);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Glassmorphism utilities */
.glass-panel {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--border-radius);
    border: var(--glass-border);
    box-shadow: var(--box-shadow);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: 1rem;
}

a {
    text-decoration: none;
    color: var(--primary-color);
    transition: color 0.3s ease;
}

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

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    box-shadow: 0 4px 15px rgba(67, 97, 238, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(67, 97, 238, 0.4);
}

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

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

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

/* Sidebar */
.sidebar {
    width: 260px;
    background: white;
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.05);
    display: flex;
    flex-direction: column;
    z-index: 100;
}

.sidebar-header {
    padding: 2rem 1.5rem;
    text-align: center;
    border-bottom: 1px solid rgba(0,0,0,0.05);
}

.sidebar-header h2 {
    color: var(--primary-color);
    margin: 0;
    font-size: 1.5rem;
    letter-spacing: 1px;
}

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

.nav-item {
    display: block;
    padding: 1rem 1.5rem;
    color: var(--gray-color);
    font-weight: 500;
    border-left: 4px solid transparent;
    transition: all 0.3s ease;
}

.nav-item:hover, .nav-item.active {
    background: rgba(67, 97, 238, 0.05);
    color: var(--primary-color);
    border-left-color: var(--primary-color);
}

.nav-item i {
    margin-right: 10px;
    width: 20px;
    text-align: center;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--bg-color);
}

/* Topbar */
.topbar {
    height: 70px;
    background: white;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.02);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2rem;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.user-name {
    font-weight: 500;
}

/* Content Area */
.content-area {
    padding: 2rem;
    flex: 1;
    overflow-y: auto;
}

/* Cards */
.card {
    background: white;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.02);
    margin-bottom: 1.5rem;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

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

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

th, td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid rgba(0,0,0,0.05);
}

th {
    color: var(--gray-color);
    font-weight: 500;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.5px;
}

tbody tr {
    transition: background-color 0.2s;
}

tbody tr:hover {
    background-color: rgba(67, 97, 238, 0.02);
}

/* Badges */
.badge {
    padding: 0.3rem 0.6rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

.badge-success { background: rgba(76, 201, 240, 0.1); color: var(--success-color); }
.badge-warning { background: rgba(248, 150, 30, 0.1); color: var(--warning-color); }
.badge-danger { background: rgba(247, 37, 133, 0.1); color: var(--danger-color); }

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--dark-color);
}

.form-control {
    width: 100%;
    padding: 0.8rem 1rem;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.1);
}

/* Modal */
.modal-backdrop {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.modal-backdrop.show {
    opacity: 1;
    pointer-events: auto;
}

.modal-content {
    background: white;
    width: 100%;
    max-width: 500px;
    border-radius: var(--border-radius);
    padding: 2rem;
    transform: translateY(-20px);
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: 0 15px 35px rgba(0,0,0,0.1);
}

.modal-backdrop.show .modal-content {
    transform: translateY(0);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

/* Utilities */
.hidden { display: none !important; }
.text-center { text-align: center; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.d-flex { display: flex; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 1rem; }