/* Reset and base */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --bg: #f5f5f5;
    --surface: white;
    --text: #222;
    --text-muted: #555;
    --text-faint: #888;
    --border: #eee;
    --h2-border: #ddd;
    --h3-color: #555;
    --header-bg: #1a2233;
    --shadow-sm: rgba(0,0,0,0.08);
    --shadow-md: rgba(0,0,0,0.1);
    --green: #27ae60;
    --green-hover: #219150;
    --red: #e74c3c;
    --red-hover: #c0392b;
    --dark-btn: #2c3e50;
    --dark-btn-hover: #1a252f;
}

[data-theme="dark"] {
    --bg: #1a1a1a;
    --surface: #2d2d2d;
    --text: #f0f0f0;
    --text-muted: #aaa;
    --text-faint: #666;
    --border: #444;
    --h2-border: #444;
    --h3-color: #aaa;
    --header-bg: #111827;
    --shadow-sm: rgba(0,0,0,0.3);
    --shadow-md: rgba(0,0,0,0.4);
    --green: #27ae60;
    --green-hover: #219150;
    --red: #e74c3c;
    --red-hover: #c0392b;
    --dark-btn: #4a5568;
    --dark-btn-hover: #2d3748;
}

body {
    font-family: sans-serif;
    background: var(--bg);
    color: var(--text);
}

/* Header */
header {
    background: var(--header-bg);
    padding: 0 2.5rem;
    min-height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: 0 1px 3px rgba(0,0,0,0.3), 0 2px 10px rgba(0,0,0,0.18);
    border-bottom: 1px solid rgba(255,255,255,0.06);
}

header a {
    color: rgba(255,255,255,0.95);
    text-decoration: none;
    font-size: 1.15rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    transition: opacity 150ms ease;
}

header a:hover {
    opacity: 0.7;
}

.header-controls {
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

.btn-theme {
    background: transparent;
    border: 1px solid rgba(255,255,255,0.4);
    color: white;
    padding: 0.3rem 0.7rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
}

.btn-theme:hover {
    background-color: rgba(255,255,255,0.1);
}

.btn-theme option {
    background: #2c3e50;
    color: white;
}

select.btn-theme {
    appearance: none;
    -webkit-appearance: none;
    padding: 0.3rem 1.75rem 0.3rem 0.7rem;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath fill='rgba(255,255,255,0.6)' d='M0 0l5 6 5-6z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.55rem center;
    font-family: inherit;
}

select.btn-theme:hover {
    border-color: rgba(255,255,255,0.65);
}

select.btn-theme:focus {
    outline: none;
    border-color: rgba(255,255,255,0.7);
}

.theme-toggle {
    padding: 0.3rem 0.55rem;
    font-size: 1rem;
    line-height: 1;
}

[data-theme="light"] .theme-toggle::before { content: "🌙"; }
[data-theme="dark"]  .theme-toggle::before { content: "☀️"; }

/* Main content */
main {
    max-width: 1100px;
    margin: 2rem auto;
    padding: 0 1rem;
}

h1 {
    margin-bottom: 1.5rem;
}

h2 {
    margin-bottom: 1rem;
    font-size: 1.3rem;
    border-bottom: 2px solid var(--h2-border);
    padding-bottom: 0.4rem;
}

h3 {
    margin: 1rem 0 0.5rem;
    color: var(--h3-color);
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Home page table grid */
.table-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 1rem;
}

.table-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    padding: 1.8rem 1.2rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: bold;
    transition: opacity 0.15s;
}

.table-card:hover {
    opacity: 0.85;
}

.table-card.dragging {
    opacity: 0.35;
    cursor: grabbing;
}

.table-card.drag-over {
    outline: 2px dashed rgba(255, 255, 255, 0.65);
    transform: scale(1.05);
}

/* Merge panel open button */
.btn-merge-open {
    margin-bottom: 1rem;
    background: transparent;
    border: 1px solid var(--h2-border);
    color: var(--text-muted);
    padding: 0.45rem 1rem;
    border-radius: 6px;
    font-size: 0.9rem;
    cursor: pointer;
    font-family: inherit;
    transition: background-color 0.15s, border-color 0.15s;
}

.btn-merge-open:hover {
    background-color: var(--border);
}

/* Merge panel */
.merge-panel {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    box-shadow: 0 2px 8px var(--shadow-md);
    margin-bottom: 1.5rem;
    overflow: hidden;
}

.merge-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border);
    font-weight: 600;
    font-size: 0.95rem;
}

.btn-merge-close {
    background: transparent;
    border: none;
    color: var(--text-faint);
    font-size: 1.1rem;
    cursor: pointer;
    padding: 0.1rem 0.35rem;
    border-radius: 4px;
    line-height: 1;
    transition: color 0.15s;
}

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

.merge-panel-body {
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.merge-panel-section {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.merge-panel-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.merge-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.merge-chip {
    padding: 0.4rem 0.9rem;
    border-radius: 6px;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text);
    font-size: 0.9rem;
    font-family: inherit;
    cursor: pointer;
    transition: background-color 0.15s, border-color 0.15s, color 0.15s;
    min-height: 36px;
}

.merge-chip:hover:not(:disabled) {
    border-color: var(--h2-border);
    background-color: var(--bg);
}

.merge-chip.selected {
    background: var(--dark-btn);
    color: white;
    border-color: var(--dark-btn);
}

.merge-chip:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.merge-panel-footer {
    padding: 0.75rem 1rem;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: flex-end;
}

.btn-merge-confirm {
    background: var(--dark-btn);
    color: white;
    padding: 0.5rem 1.25rem;
    font-size: 0.95rem;
    font-weight: 600;
    transition: background-color 0.15s, opacity 0.15s;
}

.btn-merge-confirm:disabled {
    opacity: 0.35;
    cursor: not-allowed;
}

.btn-merge-confirm:not(:disabled):hover {
    background: var(--dark-btn-hover);
}

.table-card.empty {
    background: var(--green);
    color: white;
}

.table-card.occupied {
    background: var(--red);
    color: white;
}

.table-number {
    font-size: 1.3rem;
}

.table-status {
    font-size: 0.85rem;
    opacity: 0.9;
}

.table-card.secondary {
    background: #607080;
    color: white;
}

[data-theme="dark"] .table-card.secondary {
    background: #4a5568;
}

.table-merge-badge {
    font-size: 0.75rem;
    font-weight: 600;
    opacity: 0.85;
}

/* Merge info bar (table page) */
.merge-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 0 0.75rem;
    margin-bottom: 0.75rem;
    border-bottom: 1px solid var(--border);
    font-size: 0.9rem;
    color: var(--text-muted);
}

.btn-unmerge {
    background: var(--dark-btn);
    color: white;
    padding: 0.35rem 0.85rem;
    font-size: 0.85rem;
    min-height: unset;
    transition: background-color 0.15s;
}

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

/* Table page two-column layout */
.table-page {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    align-items: start;
}

@media (max-width: 900px) {
    .table-page {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 600px) {
    header {
        padding: 0 1rem;
    }

    header a {
        font-size: 1rem;
    }
}

/* Collapsible category headers */
.menu-category-header {
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
}

.menu-category-header:hover {
    color: var(--text);
}

.menu-chevron {
    font-size: 0.85rem;
    transition: transform 150ms ease;
}

.menu-category-header.collapsed .menu-chevron {
    transform: rotate(-90deg);
}

/* Menu search */
#menu-search {
    width: 100%;
    padding: 0.6rem 0.85rem;
    margin-bottom: 0.75rem;
    background: var(--surface);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.95rem;
    font-family: inherit;
    box-sizing: border-box;
    outline: none;
    transition: border-color 0.15s, box-shadow 0.15s;
}

#menu-search:focus {
    border-color: var(--h2-border);
    box-shadow: 0 0 0 2px var(--shadow-sm);
}

/* Menu list */
.menu-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.menu-item {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    background: var(--surface);
    padding: 0.9rem 1rem;
    border-radius: 6px;
    border: 1px solid var(--border);
    box-shadow: 0 1px 3px var(--shadow-sm);
    transition: box-shadow 0.15s, border-color 0.15s, transform 0.15s;
}

.menu-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow-md);
    border-color: var(--h2-border);
}

.item-name {
    font-weight: 600;
    font-size: 0.95rem;
}

.item-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.item-price {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Order section */
.order-section {
    background: var(--surface);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 1px 4px var(--shadow-md);
}

.order-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1rem;
}

.order-table th,
.order-table td {
    padding: 0.75rem 0.6rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.order-table th {
    color: var(--text-muted);
    font-size: 0.85rem;
    text-transform: uppercase;
}

.order-total {
    font-size: 1.2rem;
    margin-bottom: 1.2rem;
    text-align: right;
}

.empty-order {
    color: var(--text-faint);
    font-style: italic;
}

/* Buttons */
.btn {
    padding: 0.6rem 1rem;
    min-height: 44px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: bold;
}

.btn-remove,
.btn-add {
    min-width: 36px;
}

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

.btn-add:hover {
    background: var(--green-hover);
}

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

.btn-remove:hover {
    background: var(--red-hover);
}

.btn-clear {
    background: var(--dark-btn);
    color: white;
    padding: 0.6rem 1.2rem;
    font-size: 1rem;
    width: 100%;
}

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

.receipt-actions {
    display: flex;
    gap: 0.75rem;
    margin-top: 1.5rem;
}

.receipt-actions .btn {
    width: auto;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    color: white;
}

@media print {
    header,
    .receipt-actions {
        display: none !important;
    }
}