:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-primary-light: #eff6ff;

    --color-success: #16a34a;
    --color-success-dark: #15803d;
    --color-success-light: #f0fdf4;

    --color-danger: #dc2626;
    --color-danger-dark: #b91c1c;
    --color-danger-light: #fef2f2;

    --color-warning: #d97706;
    --color-warning-dark: #b45309;
    --color-warning-light: #fffbeb;

    --color-ink: #1e293b;
    --color-ink-soft: #475569;
    --color-muted: #94a3b8;
    --color-border: #e2e8f0;
    --color-surface: #ffffff;
    --color-bg: #f8fafc;
    --color-bg-alt: #f1f5f9;

    --font-sans: 'Inter', 'Segoe UI', system-ui, -apple-system, Tahoma, Geneva, Verdana, sans-serif;
    --font-mono: 'SF Mono', 'Cascadia Code', 'Courier New', monospace;

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
    --shadow-md: 0 4px 16px rgba(15, 23, 42, 0.08);
    --shadow-lg: 0 8px 30px rgba(15, 23, 42, 0.12);

    --transition-fast: 0.15s ease;
    --transition-base: 0.25s ease;
}

body {
    font-family: var(--font-sans);
    margin: 0;
    padding: 20px;
    line-height: 1.6;
    color: var(--color-ink);
    background-color: var(--color-bg);
    font-variant-numeric: tabular-nums;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background-color: var(--color-surface);
    padding: 32px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

h1, h2 {
    color: var(--color-ink);
    margin-top: 0;
    letter-spacing: -0.01em;
}

h1 {
    font-size: 26px;
    font-weight: 700;
    margin-bottom: 25px;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--color-border);
}

h2 {
    font-size: 19px;
    font-weight: 600;
    margin: 25px 0 15px;
    color: var(--color-ink-soft);
}

.upload-form {
    margin-bottom: 30px;
    padding: 24px;
    border-radius: var(--radius-md);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}

.upload-form form {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.upload-form input[type="file"] {
    padding: 14px;
    border: 2px dashed #cbd5e1;
    border-radius: var(--radius-sm);
    background-color: var(--color-bg-alt);
    color: var(--color-ink-soft);
    transition: all var(--transition-base);
}

.upload-form input[type="file"]:hover {
    border-color: var(--color-primary);
    background-color: var(--color-primary-light);
}

.upload-form button[type="submit"] {
    align-self: flex-start;
    padding: 11px 22px;
    background-color: var(--color-primary);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 15px;
    font-weight: 600;
    transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.upload-form button[type="submit"]:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-1px);
}

.upload-form button[type="submit"]:active {
    transform: translateY(0);
}

.upload-form p {
    margin: 5px 0 0;
    font-size: 13px;
    color: var(--color-muted);
}

table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin: 20px 0;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    font-size: 14px;
}

th, td {
    padding: 12px 10px;
    border-bottom: 1px solid var(--color-border);
    line-height: 1.4;
}

th {
    background-color: var(--color-primary);
    color: white;
    font-weight: 600;
    font-family: var(--font-sans);
    font-size: 13px;
    letter-spacing: 0.02em;
    text-transform: uppercase;
    position: sticky;
    top: 0;
    text-align: center;
    white-space: normal;
}

th.price-column,
th.edit-column {
    padding-top: 8px;
    padding-bottom: 8px;
}

th.price-column br,
th.edit-column br {
    display: block;
    content: " ";
    margin-top: 3px;
}

td {
    text-align: left;
    font-family: var(--font-sans);
    color: var(--color-ink);
}

td.number-column,
td.price-column,
td.quantity-column,
td.delete-column {
    text-align: center;
}

tr:nth-child(even) {
    background-color: var(--color-bg);
}

tr:hover {
    background-color: var(--color-primary-light);
    transition: background-color var(--transition-fast);
}

.number-column {
    width: 40px;
    font-weight: 600;
    color: var(--color-muted);
}

.price-column {
    width: 150px;
    font-family: var(--font-mono);
    font-weight: 600;
}

.quantity-column {
    width: 110px;
    white-space: nowrap;
}

td.quantity-column {
    color: var(--color-ink-soft);
}

.edit-column {
    background-color: var(--color-warning-light);
    position: relative;
}

th.edit-column {
    background-color: var(--color-warning);
    position: relative;
}

.edit-column input {
    width: calc(100% - 24px);
    padding: 8px 12px;
    border: 1px solid #fcd34d;
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-weight: 600;
    color: var(--color-ink);
    background-color: #fff;
    box-shadow: inset 0 1px 3px rgba(0,0,0,0.05);
    transition: all var(--transition-fast);
}

.edit-column input:focus {
    border-color: var(--color-warning);
    outline: none;
    box-shadow: 0 0 0 3px rgba(217, 119, 6, 0.15);
    background-color: #fffaf0;
}

.delete-column {
    width: 50px;
}

.delete-column input[type="checkbox"] {
    transform: scale(1.2);
    cursor: pointer;
    accent-color: var(--color-danger);
}

thead tr:first-child th:first-child {
    border-top-left-radius: 8px;
}

thead tr:first-child th:last-child {
    border-top-right-radius: 8px;
}

tbody tr:last-child td:first-child {
    border-bottom-left-radius: 8px;
}

tbody tr:last-child td:last-child {
    border-bottom-right-radius: 8px;
}

.hidden-row {
    display: none;
}

.load-more-wrapper {
    display: flex;
    justify-content: center;
    margin-top: 5px;
}

.load-more-btn {
    padding: 10px 28px;
    border: 1px solid var(--color-primary);
    border-radius: var(--radius-sm);
    background-color: var(--color-primary-light);
    color: var(--color-primary-dark);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.load-more-btn:hover {
    background-color: var(--color-primary);
    color: white;
    transform: translateY(-1px);
}

.load-more-btn:active {
    transform: translateY(0);
}

.action-buttons {
    margin-top: 25px;
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.action-buttons button {
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 15px;
    font-weight: 600;
    transition: all var(--transition-fast);
}

.action-buttons button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.action-buttons button:active {
    transform: translateY(0);
}

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

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

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

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

.report-info {
    margin-bottom: 25px;
    padding: 18px 20px;
    background-color: var(--color-bg);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--color-primary);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 15px;
}

.report-info p {
    margin: 0;
    font-size: 14px;
    color: var(--color-ink-soft);
}

.report-info strong {
    color: var(--color-muted);
    display: block;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    margin-bottom: 3px;
}

.report-info-value {
    color: var(--color-primary-dark);
    font-size: 16px;
    font-weight: 600;
}

.session-notice {
    margin-top: 20px;
    padding: 16px;
    background-color: var(--color-warning-light);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--color-warning);
    display: flex;
    align-items: center;
    gap: 15px;
}

.session-notice span {
    font-size: 22px;
}

.session-notice div {
    flex: 1;
}

.session-notice strong {
    display: block;
    margin-bottom: 6px;
    color: var(--color-warning-dark);
    font-size: 15px;
}

.session-notice p {
    margin: 0;
    font-size: 13px;
    color: var(--color-warning-dark);
    line-height: 1.5;
    opacity: 0.9;
}

@media (max-width: 768px) {
    .container {
        padding: 15px;
    }

    th, td {
        padding: 8px 10px;
        font-size: 13px;
    }

    th.price-column,
    th.edit-column {
        font-size: 12px;
    }

    .action-buttons {
        flex-direction: column;
    }

    .action-buttons button {
        width: 100%;
    }
}

@media print {
    body * {
        visibility: hidden;
    }

    .price-tag-container, .price-tag-container * {
        visibility: visible;
    }

    .price-tag {
        position: absolute;
        left: 0;
        top: 0;
        width: 100%;
        height: 100%;
        margin: 0;
        padding: 10mm;
        box-sizing: border-box;
        page-break-after: always;
    }

    .no-print {
        display: none !important;
    }
}

.edit-column input.filled {
    background-color: #e8f5e9;
    border-color: #4caf50;
}

.edit-column input.filled:focus {
    background-color: #dcfce7;
    box-shadow: 0 0 0 3px rgba(22, 163, 74, 0.15);
}

.price-error {
    color: var(--color-danger);
    font-size: 12px;
    margin-top: 5px;
}

.error {
    padding: 12px 16px;
    margin-bottom: 15px;
    background-color: var(--color-danger-light);
    border-left: 4px solid var(--color-danger);
    border-radius: var(--radius-sm);
    color: var(--color-danger-dark);
    font-size: 14px;
}

.edit-column input.invalid {
    background-color: var(--color-danger-light);
    border-color: #fca5a5;
}

.edit-column input.invalid:focus {
    background-color: #fee2e2;
    box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.15);
}

.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(15, 23, 42, 0.5);
    animation: fadeIn var(--transition-base);
}

.modal-content {
    background-color: var(--color-surface);
    margin: 15% auto;
    padding: 24px;
    border-radius: var(--radius-lg);
    width: 400px;
    max-width: 90%;
    box-shadow: var(--shadow-lg);
    animation: slideUp var(--transition-base);
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

.modal-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--color-ink);
}

.print-options {
    display: flex;
    gap: 15px;
    margin-bottom: 20px;
}

.print-option {
    flex: 1;
    text-align: center;
}

.print-option-btn {
    width: 100%;
    padding: 12px;
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-sm);
    background-color: white;
    color: var(--color-primary);
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.print-option-btn:hover {
    background-color: var(--color-primary-light);
}

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

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

.modal-btn {
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: background-color var(--transition-fast);
}

.modal-btn.cancel {
    background-color: var(--color-bg-alt);
    color: var(--color-ink-soft);
}

.modal-btn.cancel:hover {
    background-color: var(--color-border);
}

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

.modal-btn.print:hover {
    background-color: var(--color-success-dark);
}