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

:root {
    --primary: #4F46E5;
    --primary-light: #818CF8;
    --success: #10B981;
    --warning: #F59E0B;
    --danger: #EF4444;
    --bg: #F3F4F6;
    --card: #FFFFFF;
    --text: #1F2937;
    --text-light: #6B7280;
    --border: #E5E7EB;
    --shadow: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-lg: 0 4px 15px rgba(0,0,0,0.15);
}

body {
    font-family: 'Sarabun', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    -webkit-tap-highlight-color: transparent;
}

#app {
    max-width: 700px;
    margin: 0 auto;
    padding-bottom: 80px;
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: white;
    padding: 20px 16px 16px;
    text-align: center;
}

.header h1 {
    font-size: 22px;
    font-weight: 700;
}

.subtitle {
    font-size: 13px;
    opacity: 0.85;
    margin-top: 2px;
}

.last-update {
    font-size: 11px;
    opacity: 0.7;
    margin-top: 4px;
}

.countdown {
    font-size: 11px;
    opacity: 0.6;
    margin-top: 2px;
}

/* Stats */
.stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    padding: 14px 16px;
    margin-top: -8px;
}

.stat-card {
    background: var(--card);
    border-radius: 12px;
    padding: 12px 8px;
    text-align: center;
    box-shadow: var(--shadow);
}

.stat-number {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary);
}

.stat-card.success .stat-number { color: var(--success); }
.stat-card.danger .stat-number { color: var(--danger); }

.stat-label {
    font-size: 11px;
    color: var(--text-light);
    margin-top: 2px;
}

/* Search */
.search-bar {
    padding: 0 16px 10px;
}

.search-bar input {
    width: 100%;
    padding: 10px 14px;
    border: 2px solid var(--border);
    border-radius: 10px;
    font-size: 14px;
    outline: none;
    transition: border-color 0.2s;
}

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

/* Filters */
.filters {
    display: flex;
    gap: 8px;
    padding: 0 16px 10px;
    flex-wrap: wrap;
}

.filter-group {
    display: flex;
    align-items: center;
    gap: 4px;
    flex: 1;
    min-width: 120px;
}

.filter-group label {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-light);
    white-space: nowrap;
}

.filter-group select {
    flex: 1;
    padding: 7px 8px;
    border: 2px solid var(--border);
    border-radius: 8px;
    font-size: 12px;
    background: var(--card);
    outline: none;
    cursor: pointer;
    min-width: 0;
}

.filter-group select:focus {
    border-color: var(--primary);
}

/* Result count */
.result-count {
    padding: 0 16px 8px;
    font-size: 12px;
    color: var(--text-light);
}

/* Loading */
.loading {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-light);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    margin: 0 auto 16px;
    animation: spin 0.8s linear infinite;
}

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

/* Error */
.error-msg {
    text-align: center;
    padding: 40px 20px;
    color: var(--danger);
}

.error-msg p {
    margin-bottom: 16px;
    font-size: 15px;
}

/* Table */
.table-wrapper {
    padding: 0 10px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.product-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
    background: var(--card);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.product-table thead {
    background: #EEF2FF;
    position: sticky;
    top: 0;
    z-index: 10;
}

.product-table th {
    padding: 10px 8px;
    text-align: left;
    font-size: 12px;
    font-weight: 700;
    color: var(--primary);
    white-space: nowrap;
    user-select: none;
}

.product-table th.sortable {
    cursor: pointer;
}

.product-table th.sortable:hover {
    background: #E0E7FF;
}

.sort-icon {
    font-size: 10px;
    opacity: 0.5;
}

.th-qty { text-align: center; width: 70px; }
.th-unit { width: 50px; }
.th-cat { width: 100px; }
.th-wh { width: 90px; }

.product-table td {
    padding: 10px 8px;
    border-top: 1px solid var(--border);
    vertical-align: middle;
}

.product-table tbody tr:hover {
    background: #F9FAFB;
}

.td-qty {
    text-align: center;
    font-weight: 700;
    font-size: 14px;
}

.qty-positive { color: var(--success); }
.qty-zero { color: var(--danger); font-weight: 800; }
.qty-low { color: var(--warning); }

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

.td-sku {
    display: block;
    font-size: 10px;
    color: var(--text-light);
    margin-top: 1px;
}

.td-cat, .td-wh {
    font-size: 11px;
    color: var(--text-light);
}

/* Load More */
.load-more {
    text-align: center;
    padding: 16px;
}

/* FAB */
.fab {
    width: 52px;
    height: 52px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 22px;
    box-shadow: var(--shadow-lg);
    cursor: pointer;
    transition: transform 0.2s, background 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.fab:hover { background: #4338CA; }
.fab:active { transform: scale(0.9); }
.fab.spinning { animation: spin 1s linear infinite; }
.fab-share { background: #10B981; }
.fab-share:hover { background: #059669; }

/* Buttons */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
}

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

.btn-primary:hover { background: #4338CA; }

.btn-secondary {
    background: var(--card);
    color: var(--text);
    border: 2px solid var(--border);
}

.btn-secondary:hover { background: var(--bg); }

/* Toast */
.toast {
    position: fixed;
    bottom: 80px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: #1F2937;
    color: white;
    padding: 10px 20px;
    border-radius: 10px;
    font-size: 13px;
    opacity: 0;
    transition: all 0.3s;
    z-index: 200;
    pointer-events: none;
    white-space: nowrap;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* Mobile tweaks */
@media (max-width: 480px) {
    .filters {
        flex-direction: column;
        gap: 6px;
    }

    .filter-group {
        min-width: 100%;
    }

    .product-table { font-size: 12px; }
    .product-table th, .product-table td { padding: 8px 6px; }
    .th-cat, .td-cat { display: none; }
}

/* FAB Group */
.fab-group {
    position: fixed;
    bottom: 20px;
    right: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 50;
}

@media (min-width: 700px) {
    .fab-group { right: calc(50% - 350px + 20px); }
}

/* Modal */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 100;
    justify-content: center;
    align-items: flex-end;
    padding: 16px;
}

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

.modal {
    background: var(--card);
    border-radius: 20px 20px 12px 12px;
    width: 100%;
    max-width: 400px;
    padding: 20px;
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from { transform: translateY(100px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.modal-header h2 { font-size: 18px; }

.close-btn {
    width: 32px;
    height: 32px;
    border: none;
    background: var(--bg);
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Share content */
.share-content { text-align: center; }

.share-desc {
    font-size: 13px;
    color: var(--text-light);
    margin-bottom: 16px;
}

.qr-wrapper {
    background: white;
    padding: 16px;
    border-radius: 12px;
    display: inline-block;
    margin-bottom: 16px;
    box-shadow: var(--shadow);
}

.qr-wrapper img {
    display: block;
    border-radius: 4px;
}

.share-link-box {
    display: flex;
    gap: 8px;
    margin-bottom: 12px;
}

.share-link-box input {
    flex: 1;
    padding: 10px 12px;
    border: 2px solid var(--border);
    border-radius: 10px;
    font-size: 12px;
    outline: none;
    background: var(--bg);
    min-width: 0;
}

.btn-copy {
    white-space: nowrap;
    padding: 10px 16px;
    font-size: 13px;
}

.share-buttons {
    display: flex;
    gap: 8px;
}

.btn-line {
    flex: 1;
    background: #06C755;
    color: white;
    font-weight: 700;
}

.btn-native {
    flex: 1;
    background: var(--bg);
    color: var(--text);
    border: 2px solid var(--border);
}

/* Scrollbar */
::-webkit-scrollbar { width: 4px; height: 4px; }
::-webkit-scrollbar-thumb { background: #D1D5DB; border-radius: 4px; }