:root {
    --primary: #4F46E5;
    --primary-hover: #4338CA;
    --bg: #F3F4F6;
    --card: #FFFFFF;
    --text: #1F2937;
    --text-muted: #6B7280;
    --border: #E5E7EB;
    --border-hover: #D1D5DB;
    --danger: #EF4444;
    --success: #10B981;
    --info: #3B82F6;
    --warning: #F59E0B;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

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

.login-body {
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #EEF2FF 0%, #E0E7FF 100%);
}

.login-box {
    width: 100%;
    max-width: 420px;
    background: rgba(255, 255, 255, 0.95);
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.05), 0 20px 48px rgba(79, 70, 229, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.5);
}

.login-logo {
    text-align: center;
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 5px;
}

.login-desc {
    text-align: center;
    color: var(--text-muted);
    margin-bottom: 30px;
    font-size: 0.9rem;
}

/* Sidebar Layout */
.sidebar {
    width: 260px;
    background-color: var(--card);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    padding: 24px 0;
    box-shadow: 2px 0 10px rgba(0,0,0,0.02);
    z-index: 10;
}

.sidebar-brand {
    font-size: 1.5rem;
    font-weight: 800;
    padding: 0 24px 24px;
    color: var(--primary);
    border-bottom: 1px solid var(--border);
    margin-bottom: 20px;
    letter-spacing: -0.5px;
}

.sidebar-menu {
    display: flex;
    flex-direction: column;
    gap: 5px;
    padding: 0 12px;
}

.sidebar-link {
    padding: 12px 16px;
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    border-radius: 10px;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 12px;
}

.sidebar-link:hover {
    background-color: #F3F4F6;
    color: var(--text);
    transform: translateX(4px);
}

.sidebar-link.active {
    background-color: var(--primary);
    color: white;
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

.sidebar-link.logout {
    margin-top: auto;
    color: var(--danger);
}
.sidebar-link.logout:hover {
    background-color: #FEF2F2;
}

/* Main Content */
.main {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}

.topbar {
    height: 70px;
    background-color: var(--card);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 30px;
    z-index: 5;
}

.page-title {
    font-size: 1.25rem;
    font-weight: 600;
}

.user-info {
    font-weight: 500;
    color: var(--text-muted);
}

.content-wrapper {
    flex: 1;
    padding: 30px;
    overflow-y: auto;
}

/* Cards & Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: var(--card);
    border-radius: 16px;
    padding: 24px;
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 20px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1);
}

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: 12px;
    background: #EEF2FF;
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.stat-details h3 {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 500;
    margin-bottom: 5px;
}

.stat-details p {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text);
}

.card {
    background: var(--card);
    border-radius: 16px;
    padding: 24px;
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05);
    border: 1px solid var(--border);
    margin-bottom: 24px;
}
.card-header {
    margin-bottom: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.card-title {
    font-size: 1.25rem;
    font-weight: 700;
}

/* Typography & Utils */
.text-center { text-align: center; }
.mb-4 { margin-bottom: 1.5rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mt-4 { margin-top: 1.5rem; }
.text-danger { color: var(--danger); }
.text-success { color: var(--success); }

.alert {
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 0.9rem;
    font-weight: 500;
}
.alert-danger { background: #FEF2F2; color: var(--danger); border: 1px solid #FCA5A5; }
.alert-success { background: #ECFDF5; color: var(--success); border: 1px solid #6EE7B7; }
.alert-info { background: #EFF6FF; color: var(--info); border: 1px solid #93C5FD; }

/* Forms */
.form-group {
    margin-bottom: 20px;
}
.form-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text);
    font-size: 0.9rem;
}
.form-control {
    width: 100%;
    padding: 12px 16px;
    border: 1.5px solid var(--border);
    border-radius: 10px;
    font-size: 1rem;
    transition: all 0.2s;
    background: #F9FAFB;
}
.form-control:focus {
    outline: none;
    background: white;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.1);
}

/* Remove arrows/spinners from number inputs */
input::-webkit-outer-spin-button,
input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}
input[type=number] {
    -moz-appearance: textfield;
}

.file-upload-wrapper {
    position: relative;
    border: 2px dashed var(--border-hover);
    border-radius: 12px;
    padding: 40px;
    text-align: center;
    background: #F9FAFB;
    transition: all 0.2s;
    cursor: pointer;
}
.file-upload-wrapper:hover {
    border-color: var(--primary);
    background: #EEF2FF;
}
.file-upload-wrapper i {
    font-size: 3rem;
    color: var(--primary);
    margin-bottom: 15px;
}
.file-upload-wrapper input[type=file] {
    opacity: 0;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    cursor: pointer;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 10px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
    text-decoration: none;
    font-size: 0.95rem;
}
.btn-primary {
    background: var(--primary);
    color: white;
}
.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(79, 70, 229, 0.3);
}
.btn-success {
    background: var(--success);
    color: white;
}
.btn-success:hover {
    background: #059669;
    box-shadow: 0 6px 15px rgba(16, 185, 129, 0.3);
}
.btn-outline {
    background: transparent;
    border: 1.5px solid var(--border);
    color: var(--text);
}
.btn-outline:hover {
    background: #F3F4F6;
    border-color: var(--border-hover);
}
.btn-block {
    width: 100%;
}

.btn-warning {
    background: var(--warning);
    color: white;
}
.btn-warning:hover {
    background: #D97706;
    box-shadow: 0 6px 15px rgba(245, 158, 11, 0.3);
}

.pagination {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 20px;
}
.pagination a, .pagination span {
    padding: 8px 12px;
    border-radius: 6px;
    border: 1px solid var(--border);
    text-decoration: none;
    color: var(--text);
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s;
}
.pagination a:hover {
    background: #F3F4F6;
    border-color: var(--border-hover);
}
.pagination .active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* Tables */
.table-responsive {
    overflow-x: auto;
    border-radius: 12px;
    border: 1px solid var(--border);
    -webkit-overflow-scrolling: touch;
}
.table-responsive::-webkit-scrollbar {
    height: 8px;
}
.table-responsive::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 10px;
}
.table-responsive::-webkit-scrollbar-thumb {
    background: var(--border-hover);
    border-radius: 10px;
}
.table-responsive::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}
.table {
    width: 100%;
    border-collapse: collapse;
    background: white;
}
.table th, .table td {
    padding: 16px;
    text-align: left;
    border-bottom: 1px solid var(--border);
    white-space: nowrap;
}
.table th {
    background: #F9FAFB;
    font-weight: 600;
    color: var(--text-muted);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.table tr:last-child td {
    border-bottom: none;
}
.table tr:hover td {
    background: #F9FAFB;
}

/* Badges */
.badge {
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
}
.badge-success {
    background: #D1FAE5;
    color: #065F46;
}

/* Responsive Media Queries */
@media screen and (max-width: 1024px) {
    .sidebar {
        width: 240px;
    }
}

@media screen and (max-width: 768px) {
    body {
        flex-direction: column;
    }

    .sidebar {
        position: fixed;
        left: -260px;
        top: 0;
        bottom: 0;
        transition: all 0.3s ease;
        z-index: 1000;
        width: 260px;
        box-shadow: 10px 0 30px rgba(0,0,0,0.1);
    }

    .sidebar.show {
        left: 0;
    }

    .main {
        width: 100%;
        overflow: visible;
    }

    .topbar {
        padding: 0 15px;
        position: sticky;
        top: 0;
        width: 100%;
    }

    .topbar-toggle {
        display: block !important;
        background: none;
        border: none;
        font-size: 1.5rem;
        cursor: pointer;
        color: var(--primary);
        margin-right: 15px;
    }

    .content-wrapper {
        padding: 15px;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .stat-card {
        padding: 15px;
    }

    .card {
        padding: 15px;
    }

    .card-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }

    .table th, .table td {
        padding: 12px 10px;
        font-size: 0.85rem;
    }

    .btn {
        width: 100%;
        margin-bottom: 5px;
    }

    .user-info {
        display: none;
    }

    .sidebar-overlay {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0,0,0,0.5);
        z-index: 999;
        backdrop-filter: blur(2px);
    }

    .sidebar-overlay.show {
        display: block;
    }
}

@media print {
    .sidebar, .topbar, .btn, .no-print {
        display: none !important;
    }
    .main, .card {
        border: none;
        box-shadow: none;
        background: transparent;
    }
    body {
        background: white;
    }
    .content-wrapper {
        padding: 0;
    }
    @page {
        margin: 1cm;
    }
}