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

:root {
    --bg-color: #1a1a2e;
    --bg-secondary: #16213e;
    --text-color: #eee;
    --text-muted: #888;
    --accent-color: #0f3460;
    --accent-hover: #1a4a80;
    --success-color: #2ecc71;
    --danger-color: #e74c3c;
    --category-bg: #0f3460;
    --row-bg: #1a1a2e;
    --row-alt-bg: #16213e;
    --border-color: #333;
}

html, body {
    width: 812px;
    min-height: 375px;
    height: 100vh;
    overflow: hidden;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 14px;
    background: var(--bg-color);
    color: var(--text-color);
    margin: 0 auto;
}

.screen {
    display: none;
    width: 100%;
    height: 100%;
    flex-direction: column;
}

.screen.active {
    display: flex;
}

/* Header */
header {
    display: flex;
    align-items: center;
    padding: 8px 12px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    height: 44px;
    flex-shrink: 0;
}

header h1 {
    font-size: 16px;
    font-weight: 500;
    flex: 1;
    text-align: center;
}

.header-spacer {
    flex: 1;
}

.btn-mode {
    background: var(--accent-color);
    color: var(--text-color);
    border: none;
    padding: 6px 16px;
    border-radius: 4px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    min-width: 70px;
}

.btn-mode:hover {
    background: var(--accent-hover);
}

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

.btn-icon {
    background: var(--accent-color);
    color: var(--text-color);
    border: none;
    width: 36px;
    height: 32px;
    border-radius: 4px;
    font-size: 18px;
    cursor: pointer;
    margin-left: 8px;
}

.btn-icon:hover {
    background: var(--accent-hover);
}

.btn-back {
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 14px;
    cursor: pointer;
    padding: 6px 12px;
}

/* Table */
.table-container {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
}

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

thead {
    position: sticky;
    top: 0;
    z-index: 10;
    background: var(--bg-secondary);
}

th {
    padding: 8px 4px;
    text-align: left;
    font-weight: 500;
    font-size: 12px;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border-color);
}

td {
    padding: 6px 4px;
    border-bottom: 1px solid var(--border-color);
    vertical-align: middle;
}

/* Column widths */
.col-check { width: 30px; text-align: center; }
.col-name { width: auto; }
.col-qty { width: 45px; text-align: center; }
.col-unit { width: 50px; text-align: center; }
.col-count { width: 55px; text-align: center; }
.col-price { width: 60px; text-align: right; }
.col-total { width: 65px; text-align: right; }
.col-delete { width: 35px; text-align: center; }

/* Category row */
.category-row {
    background: var(--category-bg);
    cursor: pointer;
    user-select: none;
}

.category-row td {
    padding: 10px 8px;
    font-weight: 600;
}

.category-row:hover {
    background: var(--accent-hover);
}

.category-toggle {
    display: inline-block;
    width: 16px;
    margin-right: 8px;
    font-size: 12px;
}

.category-stats {
    float: right;
    font-weight: 400;
    color: var(--text-muted);
}

.category-sum {
    margin-left: 16px;
    color: var(--text-color);
}

/* Item row */
.item-row {
    background: var(--row-bg);
}

.item-row:nth-child(even) {
    background: var(--row-alt-bg);
}

.item-row.done {
    opacity: 0.6;
}

.item-row.done .item-name {
    text-decoration: line-through;
}

.item-row.hidden {
    display: none;
}

/* Toggle all button */
.btn-toggle-all {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 12px;
    cursor: pointer;
    padding: 2px 6px;
    border-radius: 3px;
    transition: transform 0.2s;
}

.btn-toggle-all:hover {
    background: rgba(255,255,255,0.1);
    color: var(--text-color);
}

.btn-toggle-all.collapsed {
    transform: rotate(-90deg);
}

/* Checkbox */
.item-checkbox {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--success-color);
}

/* Editable cells */
.editable {
    cursor: pointer;
    padding: 2px 4px;
    border-radius: 3px;
}

.editable:hover {
    background: rgba(255,255,255,0.1);
}

.editable input {
    width: 100%;
    background: var(--bg-secondary);
    border: 1px solid var(--accent-color);
    color: var(--text-color);
    padding: 2px 4px;
    font-size: 13px;
    border-radius: 3px;
}

/* Unit dropdown */
.unit-edit-container {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.unit-select {
    width: 100%;
    background: var(--bg-secondary);
    border: 1px solid var(--accent-color);
    color: var(--text-color);
    padding: 2px 4px;
    font-size: 13px;
    border-radius: 3px;
    cursor: pointer;
}

.unit-select option {
    background: var(--bg-secondary);
    color: var(--text-color);
}

.unit-custom-input {
    width: 100%;
    background: var(--bg-secondary);
    border: 1px solid var(--accent-color);
    color: var(--text-color);
    padding: 2px 4px;
    font-size: 12px;
    border-radius: 3px;
}

.item-name {
    max-width: 150px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Delete button */
.btn-delete {
    background: none;
    border: none;
    color: var(--danger-color);
    font-size: 16px;
    cursor: pointer;
    opacity: 0.6;
    padding: 4px;
}

.btn-delete:hover {
    opacity: 1;
}

/* Settings screen */
.settings-content {
    flex: 1;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.sums-container {
    display: flex;
    gap: 40px;
}

.sum-row {
    display: flex;
    align-items: center;
    gap: 12px;
}

.sum-label {
    font-weight: 600;
    color: var(--text-muted);
}

.sum-value {
    font-size: 20px;
    font-weight: 700;
}

.buttons-container {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    justify-content: center;
}

.btn-action {
    background: var(--accent-color);
    color: var(--text-color);
    border: none;
    padding: 12px 20px;
    border-radius: 6px;
    font-size: 14px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-action:hover {
    background: var(--accent-hover);
}

.btn-icon-left {
    font-size: 16px;
}

.danger-zone {
    margin-top: auto;
}

.btn-danger {
    background: var(--danger-color);
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 6px;
    font-size: 14px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-danger:hover {
    background: #c0392b;
}

/* Dialog */
.dialog-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.7);
    justify-content: center;
    align-items: center;
    z-index: 100;
}

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

.dialog {
    background: var(--bg-secondary);
    padding: 20px;
    border-radius: 8px;
    min-width: 300px;
    max-width: 400px;
}

.dialog h2 {
    font-size: 16px;
    margin-bottom: 16px;
}

.dialog p {
    margin-bottom: 16px;
    color: var(--text-muted);
}

.form-group {
    margin-bottom: 12px;
}

.form-group label {
    display: block;
    font-size: 12px;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.form-group input {
    width: 100%;
    padding: 8px 12px;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-color);
    font-size: 14px;
}

.form-group input:focus {
    outline: none;
    border-color: var(--accent-color);
}

.dialog-buttons {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    margin-top: 16px;
}

.btn-cancel {
    background: var(--bg-color);
    color: var(--text-muted);
    border: 1px solid var(--border-color);
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
}

.btn-confirm {
    background: var(--accent-color);
    color: var(--text-color);
    border: none;
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
}

.btn-confirm:hover {
    background: var(--accent-hover);
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: var(--bg-color);
}

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

/* Sync indicator */
.sync-indicator {
    position: fixed;
    bottom: 8px;
    right: 8px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--success-color);
    opacity: 0.5;
}

.sync-indicator.syncing {
    animation: pulse 0.5s ease-in-out;
}

@keyframes pulse {
    0%, 100% { opacity: 0.5; transform: scale(1); }
    50% { opacity: 1; transform: scale(1.2); }
}