/* ============================================
   Design System — Color Palette & Typography
   ============================================ */
:root {
    --bg-page: #f7f7f5;
    --bg-surface: #ffffff;
    --bg-navbar: #1e293b;
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-primary-light: #eff6ff;
    --color-accent: #0ea5e9;
    --color-success: #059669;
    --color-success-light: #ecfdf5;
    --color-danger: #dc2626;
    --color-danger-light: #fef2f2;
    --color-warning-light: #fffbeb;
    --color-text: #1e293b;
    --color-text-secondary: #64748b;
    --color-text-muted: #94a3b8;
    --color-border: #e2e8f0;
    --color-border-light: #f1f5f9;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.08);
    --transition: 0.2s ease;
}

/* ============================================
   Base
   ============================================ */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-color: var(--bg-page);
    color: var(--color-text);
    font-size: 0.9rem;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    color: var(--color-text);
}

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

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

/* ============================================
   Navbar
   ============================================ */
.navbar {
    background-color: var(--bg-navbar) !important;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.12);
    padding: 0.6rem 0;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.05rem;
    letter-spacing: -0.02em;
}

.navbar .nav-link {
    font-weight: 500;
    font-size: 0.85rem;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    transition: background-color var(--transition);
}

.navbar .nav-link:hover {
    background-color: rgba(255, 255, 255, 0.08);
}

/* ============================================
   Cards
   ============================================ */
.card {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    background: var(--bg-surface);
    overflow: hidden;
}

.card-header {
    border-bottom: 1px solid var(--color-border);
    font-weight: 600;
}

.card-header-blue {
    background-color: var(--color-primary-light);
    color: var(--color-primary);
}

.card-header-green {
    background-color: var(--color-success-light);
    color: var(--color-success);
}

.card-header h5,
.card-header h6 {
    font-weight: 600;
    font-size: 0.9rem;
}

.card-header-blue h5,
.card-header-blue h6 {
    color: var(--color-primary);
}

.card-header-green h5,
.card-header-green h6 {
    color: var(--color-success);
}

/* ============================================
   Form Controls
   ============================================ */
.form-control {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    padding: 0.45rem 0.75rem;
    color: var(--color-text);
    background-color: var(--bg-surface);
    transition: border-color var(--transition), box-shadow var(--transition);
}

.form-control:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-control::placeholder {
    color: var(--color-text-muted);
}

.form-label {
    font-weight: 500;
    font-size: 0.78rem;
    color: var(--color-text-secondary);
    margin-bottom: 0.3rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    font-weight: 500;
    font-size: 0.85rem;
    border-radius: var(--radius-sm);
    padding: 0.45rem 1rem;
    transition: all var(--transition);
    letter-spacing: -0.01em;
}

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

.btn-primary:hover {
    background-color: var(--color-primary-hover);
    border-color: var(--color-primary-hover);
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.25);
}

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

.btn-outline-secondary:hover {
    background-color: var(--color-border-light);
    border-color: var(--color-border);
    color: var(--color-text);
}

.btn-outline-danger {
    border-color: var(--color-border);
    color: var(--color-danger);
}

.btn-outline-danger:hover {
    background-color: var(--color-danger-light);
    border-color: var(--color-danger);
    color: var(--color-danger);
}

.btn-outline-primary {
    border-color: var(--color-border);
    color: var(--color-primary);
}

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

/* ============================================
   Tables
   ============================================ */
.table {
    font-size: 0.84rem;
    margin-bottom: 0;
}

.table > thead > tr > th {
    background-color: var(--color-border-light);
    color: var(--color-text-secondary);
    font-weight: 600;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    border-bottom: 2px solid var(--color-border);
    padding: 0.6rem 0.75rem;
    white-space: nowrap;
}

.table > tbody > tr > td {
    padding: 0.55rem 0.75rem;
    border-color: var(--color-border-light);
    vertical-align: middle;
}

.table > tbody > tr:hover {
    background-color: #f8fafc;
}

.table > tbody > tr:last-child > td {
    border-bottom: none;
}

/* ============================================
   Alerts
   ============================================ */
.alert {
    border-radius: var(--radius-md);
    border: none;
    font-size: 0.85rem;
    font-weight: 500;
}

.alert-success {
    background-color: var(--color-success-light);
    color: var(--color-success);
}

.alert-danger {
    background-color: var(--color-danger-light);
    color: var(--color-danger);
}

.alert-info {
    background-color: var(--color-primary-light);
    color: var(--color-primary);
}

.alert-warning {
    background-color: var(--color-warning-light);
    color: #92400e;
}

/* ============================================
   Badges
   ============================================ */
.badge-subtle {
    font-size: 0.72rem;
    font-weight: 600;
    padding: 0.3rem 0.6rem;
    border-radius: 999px;
    letter-spacing: 0.02em;
}

.badge-blue {
    background-color: var(--color-primary-light);
    color: var(--color-primary);
}

.badge-green {
    background-color: var(--color-success-light);
    color: var(--color-success);
}

/* ============================================
   Upload Page
   ============================================ */
.upload-area {
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-lg);
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: border-color var(--transition), background-color var(--transition);
    background-color: #fafaf9;
}

.upload-area:hover,
.upload-area.dragover {
    border-color: var(--color-primary);
    background-color: var(--color-primary-light);
}

.upload-area .upload-icon {
    font-size: 2.5rem;
    color: var(--color-text-muted);
    margin-bottom: 0.75rem;
    transition: color var(--transition);
}

.upload-area:hover .upload-icon {
    color: var(--color-primary);
}

.upload-area h5 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.upload-area .text-muted {
    font-size: 0.85rem;
    color: var(--color-text-muted) !important;
}

/* ============================================
   Review Page — Split Layout
   ============================================ */
.review-layout {
    display: flex;
    height: calc(100vh - 52px);
    overflow: hidden;
}

.pdf-panel {
    width: 50%;
    min-width: 0;
    height: 100%;
    background: #3b3f44;
}

.pdf-panel iframe {
    width: 100%;
    height: 100%;
    border: none;
}

.form-panel {
    width: 50%;
    min-width: 0;
    height: 100%;
    overflow-y: auto;
    padding: 1rem 1.25rem;
    background: var(--bg-page);
}

/* Review form specific */
.review-table input,
.review-table textarea {
    font-size: 0.8rem;
}

.review-table .form-control {
    min-width: 70px;
    padding: 0.3rem 0.5rem;
}

.header-card .form-label {
    font-weight: 600;
    font-size: 0.72rem;
    color: var(--color-text-secondary);
}

.item-row:hover {
    background-color: var(--color-primary-light) !important;
}

/* ============================================
   Detail Page
   ============================================ */
.detail-label {
    display: block;
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 0.2rem;
}

.detail-value {
    font-size: 0.9rem;
    color: var(--color-text);
    font-weight: 500;
}

/* ============================================
   History Page
   ============================================ */
.search-bar .form-control {
    border-radius: var(--radius-md);
    padding: 0.55rem 1rem;
    font-size: 0.85rem;
}

.search-bar .btn {
    border-radius: var(--radius-md);
}

.picking-nr-link {
    font-weight: 600;
    color: var(--color-primary);
}

.picking-nr-link:hover {
    color: var(--color-primary-hover);
    text-decoration: underline;
}

.empty-state {
    padding: 4rem 1rem;
}

.empty-state i {
    font-size: 3rem;
    color: var(--color-text-muted);
}

.empty-state p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    margin-top: 0.75rem;
}

/* ============================================
   Page Header
   ============================================ */
.page-header h4 {
    font-size: 1.15rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.page-header h4 i {
    color: var(--color-text-secondary);
    margin-right: 0.3rem;
}

/* ============================================
   Loading Spinner
   ============================================ */
.spinner-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(247, 247, 245, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    backdrop-filter: blur(2px);
}

.spinner-overlay .spinner-border {
    color: var(--color-primary) !important;
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 991px) {
    .review-layout {
        flex-direction: column;
        height: auto;
    }

    .pdf-panel {
        width: 100%;
        height: 50vh;
    }

    .form-panel {
        width: 100%;
        height: auto;
        overflow-y: visible;
    }
}

/* ============================================
   Scrollbar (for form panel)
   ============================================ */
.form-panel::-webkit-scrollbar {
    width: 6px;
}

.form-panel::-webkit-scrollbar-track {
    background: transparent;
}

.form-panel::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 3px;
}

.form-panel::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-muted);
}