/* ===== Reset & Base Styles ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --info-color: #06b6d4;
    
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-sidebar: #1e293b;
    
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --text-light: #94a3b8;
    
    --border-color: #e2e8f0;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

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

/* ===== Layout ===== */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: 260px;
    background-color: var(--bg-sidebar);
    color: white;
    overflow-y: auto;
    z-index: 1000;
    box-shadow: var(--shadow-lg);
}

.logo {
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.logo i {
    font-size: 2rem;
    color: var(--primary-color);
}

.logo h2 {
    font-size: 1.25rem;
    font-weight: 600;
}

.menu {
    padding: 1rem 0;
}

.menu-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.875rem 1.5rem;
    color: #cbd5e1;
    text-decoration: none;
    transition: all 0.3s ease;
}

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

.menu-item.active {
    background-color: var(--primary-color);
    color: white;
    border-left: 4px solid white;
}

.menu-item i {
    font-size: 1.125rem;
    width: 20px;
}

.main-content {
    margin-left: 260px;
    padding: 2rem;
    min-height: 100vh;
}

/* ===== Header ===== */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--border-color);
}

.header h1 {
    font-size: 1.875rem;
    color: var(--text-primary);
    font-weight: 700;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
}

.user-info i {
    font-size: 1.5rem;
}

/* ===== Statistics Cards ===== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: 1.25rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.stat-pending .stat-icon {
    background-color: rgba(245, 158, 11, 0.1);
    color: var(--warning-color);
}

.stat-approved .stat-icon {
    background-color: rgba(6, 182, 212, 0.1);
    color: var(--info-color);
}

.stat-completed .stat-icon {
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
}

.stat-cancelled .stat-icon {
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--danger-color);
}

.stat-details h3 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.stat-details p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* ===== Content Card ===== */
.content-card {
    background: var(--bg-secondary);
    border-radius: 0.75rem;
    box-shadow: var(--shadow);
    margin-bottom: 1.5rem;
    overflow: hidden;
}

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

.card-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.card-body {
    padding: 1.5rem;
}

/* ===== Buttons ===== */
.btn {
    padding: 0.625rem 1.25rem;
    border: none;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

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

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

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

.btn-success:hover {
    background-color: #059669;
}

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

.btn-danger:hover {
    background-color: #dc2626;
}

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

.btn-secondary:hover {
    background-color: #475569;
}

.btn-outline {
    background-color: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

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

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

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

thead {
    background-color: var(--bg-primary);
}

th {
    padding: 1rem;
    text-align: left;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

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

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

tbody tr:hover {
    background-color: var(--bg-primary);
}

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

.text-error {
    color: var(--danger-color);
}

/* ===== Badges ===== */
.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.badge-pending {
    background-color: rgba(245, 158, 11, 0.1);
    color: var(--warning-color);
}

.badge-approved {
    background-color: rgba(6, 182, 212, 0.1);
    color: var(--info-color);
}

.badge-in-progress {
    background-color: rgba(37, 99, 235, 0.1);
    color: var(--primary-color);
}

.badge-completed {
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
}

.badge-cancelled {
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--danger-color);
}

.badge-priority-ปกติ {
    background-color: rgba(100, 116, 139, 0.1);
    color: var(--secondary-color);
}

.badge-priority-ด่วน {
    background-color: rgba(245, 158, 11, 0.1);
    color: var(--warning-color);
}

.badge-priority-ด่วนมาก {
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--danger-color);
}

/* ===== Form Styles ===== */
.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.25rem;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-group.full-width {
    grid-column: 1 / -1;
}

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

.form-group label .required {
    color: var(--danger-color);
}

.form-control {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 0.875rem;
    transition: all 0.3s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

textarea.form-control {
    min-height: 120px;
    resize: vertical;
}

select.form-control {
    cursor: pointer;
}

/* ===== Info Box ===== */
.info-box {
    padding: 1rem;
    border-radius: 0.5rem;
    margin-bottom: 1.5rem;
    display: flex;
    gap: 0.75rem;
}

.info-box.info {
    background-color: rgba(37, 99, 235, 0.1);
    border-left: 4px solid var(--primary-color);
}

.info-box.success {
    background-color: rgba(16, 185, 129, 0.1);
    border-left: 4px solid var(--success-color);
}

.info-box.warning {
    background-color: rgba(245, 158, 11, 0.1);
    border-left: 4px solid var(--warning-color);
}

.info-box.error {
    background-color: rgba(239, 68, 68, 0.1);
    border-left: 4px solid var(--danger-color);
}

.info-box i {
    font-size: 1.25rem;
}

/* ===== Detail View ===== */
.detail-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.detail-item {
    padding: 1rem;
    background-color: var(--bg-primary);
    border-radius: 0.5rem;
}

.detail-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.25rem;
}

.detail-value {
    font-size: 1rem;
    color: var(--text-primary);
    font-weight: 500;
}

/* ===== Timeline ===== */
.timeline {
    position: relative;
    padding-left: 2rem;
}

.timeline-item {
    position: relative;
    padding-bottom: 2rem;
}

.timeline-item:before {
    content: '';
    position: absolute;
    left: -2rem;
    top: 0.5rem;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: var(--primary-color);
}

.timeline-item:after {
    content: '';
    position: absolute;
    left: -1.625rem;
    top: 1.25rem;
    width: 2px;
    height: calc(100% - 0.5rem);
    background-color: var(--border-color);
}

.timeline-item:last-child:after {
    display: none;
}

.timeline-date {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.timeline-content {
    font-size: 0.875rem;
    color: var(--text-primary);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .sidebar {
        width: 70px;
    }
    
    .sidebar .logo h2,
    .sidebar .menu-item span {
        display: none;
    }
    
    .sidebar .logo {
        justify-content: center;
    }
    
    .main-content {
        margin-left: 70px;
        padding: 1rem;
    }
    
    .header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .form-grid {
        grid-template-columns: 1fr;
    }
    
    .detail-grid {
        grid-template-columns: 1fr;
    }
}

/* ===== Print Styles ===== */
@media print {
    .sidebar,
    .header .user-info,
    .btn,
    button {
        display: none !important;
    }
    
    .main-content {
        margin-left: 0;
        padding: 0;
    }
    
    .content-card {
        box-shadow: none;
        border: 1px solid var(--border-color);
    }
}

/* ===== Loading Spinner ===== */
.spinner {
    border: 3px solid var(--border-color);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 2rem auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* ===== Modal ===== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 2000;
    align-items: center;
    justify-content: center;
}

.modal.show {
    display: flex;
}

.modal-content {
    background: var(--bg-secondary);
    border-radius: 0.75rem;
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
}

.modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
}

.btn-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
}

.btn-close:hover {
    color: var(--text-primary);
}