:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --dark-color: #1f2937;
    --light-color: #f3f4f6;
    --border-color: #e5e7eb;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --sidebar-width: 260px;
    --topbar-height: 70px;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--light-color);
    color: var(--text-primary);
    line-height: 1.6;
}

/* Sidebar */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--dark-color);
    color: white;
    transition: transform 0.3s ease;
    z-index: 1000;
    overflow-y: auto;
}

.sidebar .logo {
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 15px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar .logo i {
    font-size: 32px;
    color: var(--primary-color);
}

.sidebar .logo h2 {
    font-size: 24px;
    font-weight: 600;
}

.nav-menu {
    padding: 20px 0;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 15px 20px;
    color: #9ca3af;
    text-decoration: none;
    transition: all 0.3s ease;
    border-left: 3px solid transparent;
}

.nav-item:hover {
    background: rgba(255, 255, 255, 0.05);
    color: white;
}

.nav-item.active {
    background: rgba(37, 99, 235, 0.1);
    color: white;
    border-left-color: var(--primary-color);
}

.nav-item i {
    font-size: 18px;
    width: 20px;
}

/* Main Content */
.main-content {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    transition: margin-left 0.3s ease;
}

/* Top Bar */
.top-bar {
    position: sticky;
    top: 0;
    height: var(--topbar-height);
    background: white;
    display: flex;
    align-items: center;
    padding: 0 30px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    z-index: 100;
    gap: 20px;
}

.menu-toggle {
    display: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-primary);
}

.search-bar {
    flex: 1;
    max-width: 500px;
    position: relative;
}

.search-bar i {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
}

.search-bar input {
    width: 100%;
    padding: 12px 15px 12px 45px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    outline: none;
    transition: border-color 0.3s;
}

.search-bar input:focus {
    border-color: var(--primary-color);
}

.user-actions {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-left: auto;
}

.notification {
    position: relative;
    cursor: pointer;
    font-size: 20px;
    color: var(--text-secondary);
}

.notification .badge {
    position: absolute;
    top: -8px;
    right: -8px;
    background: var(--danger-color);
    color: white;
    font-size: 10px;
    padding: 2px 6px;
    border-radius: 10px;
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
}

.user-profile img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
}

.user-profile span {
    font-weight: 500;
}

/* Content Area */
.content {
    padding: 30px;
}

.page-content {
    display: none;
}

.page-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

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

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.page-header h1 {
    font-size: 28px;
    font-weight: 600;
    color: var(--text-primary);
}

/* Buttons */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
}

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

.btn-primary:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

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

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

.btn-secondary {
    background: var(--border-color);
    color: var(--text-primary);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 12px;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: white;
    padding: 24px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    gap: 20px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

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

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: white;
}

.stat-icon.bg-blue {
    background: var(--primary-color);
}

.stat-icon.bg-green {
    background: var(--success-color);
}

.stat-icon.bg-orange {
    background: var(--warning-color);
}

.stat-icon.bg-purple {
    background: #8b5cf6;
}

.stat-details h3 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 4px;
}

.stat-details p {
    color: var(--text-secondary);
    font-size: 14px;
}

/* Content Grid */
.content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 20px;
}

/* Cards */
.card {
    background: white;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    overflow: hidden;
}

.card-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-header h3 {
    font-size: 18px;
    font-weight: 600;
}

.view-all {
    color: var(--primary-color);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
}

.view-all:hover {
    text-decoration: underline;
}

.card-body {
    padding: 24px;
}

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

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

thead {
    background: var(--light-color);
}

th {
    padding: 12px;
    text-align: left;
    font-weight: 600;
    font-size: 13px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

td {
    padding: 12px;
    border-bottom: 1px solid var(--border-color);
}

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

.text-center {
    text-align: center;
}

/* Status Badges */
.badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
}

.badge-success {
    background: #d1fae5;
    color: #065f46;
}

.badge-warning {
    background: #fef3c7;
    color: #92400e;
}

.badge-danger {
    background: #fee2e2;
    color: #991b1b;
}

.badge-info {
    background: #dbeafe;
    color: #1e40af;
}

/* Filters */
.filters {
    display: flex;
    gap: 15px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.filters input,
.filters select {
    padding: 10px 15px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    outline: none;
    flex: 1;
    min-width: 200px;
}

.filters input:focus,
.filters select:focus {
    border-color: var(--primary-color);
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

.loading-overlay.active {
    display: flex;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Toast Notification */
.toast {
    position: fixed;
    top: 90px;
    right: 30px;
    padding: 16px 24px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
    display: none;
    align-items: center;
    gap: 12px;
    z-index: 10000;
    animation: slideIn 0.3s ease;
}

.toast.show {
    display: flex;
}

.toast.success {
    border-left: 4px solid var(--success-color);
}

.toast.error {
    border-left: 4px solid var(--danger-color);
}

.toast.warning {
    border-left: 4px solid var(--warning-color);
}

/* Modal */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.45);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal {
    width: 640px;
    max-width: 95vw;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    overflow: hidden;
    animation: fadeIn 0.2s ease-in-out;
}

.modal-header {
    padding: 16px 20px;
    border-bottom: 1px solid #eee;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.modal-header h3 { margin: 0; }
.modal-close { border: none; background: transparent; font-size: 18px; cursor: pointer; }

.modal-body { padding: 16px 20px; }
.modal-footer { padding: 14px 20px; border-top: 1px solid #eee; display:flex; gap:10px; justify-content:flex-end; }

.form-grid { display:grid; grid-template-columns: 1fr 1fr; gap:12px 16px; }
.form-grid .full { grid-column: 1 / -1; }
.form-field label { display:block; font-weight:600; margin-bottom:6px; }
.form-field input,
.form-field select,
.form-field textarea { width:100%; padding:10px; border:1px solid #d1d5db; border-radius:8px; font-size:14px; }
.form-field input[type="number"] { text-align:right; }

.btn-secondary { background:#e5e7eb; color:#111827; }


@keyframes slideIn {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* Responsive Design */
@media (max-width: 1024px) {
    .content-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.active {
        transform: translateX(0);
    }

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

    .menu-toggle {
        display: block;
    }

    .stats-grid {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    }

    .top-bar {
        padding: 0 15px;
    }

    .search-bar {
        max-width: 100%;
    }

    .content {
        padding: 15px;
    }

    .filters {
        flex-direction: column;
    }

    .filters input,
    .filters select {
        width: 100%;
    }

    table {
        font-size: 13px;
    }

    th, td {
        padding: 8px;
    }
}

/* Alert Box */
.alert {
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.alert-warning {
    background: #fef3c7;
    border-left: 4px solid var(--warning-color);
    color: #92400e;
}

.alert-danger {
    background: #fee2e2;
    border-left: 4px solid var(--danger-color);
    color: #991b1b;
}

.alert i {
    font-size: 18px;
}

/* Action Buttons in Tables */
.action-btns {
    display: flex;
    gap: 8px;
}

.action-btn {
    padding: 6px 10px;
    border: none;
    background: transparent;
    cursor: pointer;
    color: var(--text-secondary);
    border-radius: 4px;
    transition: all 0.2s;
}

.action-btn:hover {
    background: var(--light-color);
    color: var(--text-primary);
}

.action-btn.edit:hover {
    color: var(--primary-color);
}

.action-btn.delete:hover {
    color: var(--danger-color);
}

.action-btn.view:hover {
    color: var(--success-color);
}

/* Reports Grid */
.reports-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 20px;
}