/* ===== Reset & Base ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #dbeafe;
    --primary-bg: #eff6ff;
    --success: #16a34a;
    --success-light: #dcfce7;
    --danger: #dc2626;
    --danger-light: #fee2e2;
    --warning: #f59e0b;
    --warning-light: #fef3c7;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
    --transition: 0.2s ease;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans TC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--gray-800);
    background: var(--gray-50);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ===== Header ===== */
.header {
    background: linear-gradient(135deg, var(--primary) 0%, #1e40af 100%);
    color: white;
    padding: 32px 0;
    text-align: center;
}

.header-title {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: 0.02em;
}

.header-subtitle {
    margin-top: 8px;
    font-size: 1rem;
    opacity: 0.85;
    font-weight: 300;
}

.mode-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: 12px;
    padding: 5px 14px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 0.02em;
}

.mode-badge.mode-python {
    background: rgba(22, 163, 74, 0.25);
    color: #bbf7d0;
}

.mode-badge.mode-static {
    background: rgba(245, 158, 11, 0.25);
    color: #fde68a;
}

/* ===== Step Sections ===== */
.step-section {
    margin: 24px 0;
    animation: fadeInUp 0.4s ease;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(16px); }
    to { opacity: 1; transform: translateY(0); }
}

.step-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--primary);
    color: white;
    font-weight: 700;
    font-size: 1rem;
    flex-shrink: 0;
}

.step-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-800);
}

/* ===== Upload Area ===== */
.upload-area {
    border: 2px dashed var(--gray-300);
    border-radius: var(--radius);
    padding: 48px 24px;
    text-align: center;
    background: white;
    transition: all var(--transition);
    cursor: pointer;
}

.upload-area:hover,
.upload-area.drag-over {
    border-color: var(--primary);
    background: var(--primary-bg);
}

.upload-area.drag-over {
    transform: scale(1.01);
}

.upload-icon {
    color: var(--gray-400);
    margin-bottom: 16px;
}

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

.upload-text {
    font-size: 1rem;
    color: var(--gray-600);
    margin-bottom: 12px;
}

.upload-btn {
    display: inline-block;
    padding: 10px 24px;
    background: var(--primary);
    color: white;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: background var(--transition);
}

.upload-btn:hover {
    background: var(--primary-hover);
}

.upload-hint {
    margin-top: 12px;
    font-size: 0.85rem;
    color: var(--gray-400);
}

/* File Info */
.file-info {
    margin-top: 12px;
    background: var(--primary-light);
    border-radius: var(--radius-sm);
    padding: 12px 16px;
}

.file-info-content {
    display: flex;
    align-items: center;
    gap: 10px;
}

.file-info-content svg {
    color: var(--primary);
    flex-shrink: 0;
}

.file-info-content span {
    flex: 1;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--primary);
    word-break: break-all;
}

.btn-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    border-radius: 50%;
    cursor: pointer;
    color: var(--gray-500);
    transition: all var(--transition);
    flex-shrink: 0;
}

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

/* ===== Parsed Info Card ===== */
.parsed-info-card {
    background: white;
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
    margin-bottom: 16px;
}

.parsed-info-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--gray-700);
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.info-item label {
    display: block;
    font-size: 0.8rem;
    color: var(--gray-500);
    margin-bottom: 4px;
}

.info-item span {
    font-size: 1rem;
    font-weight: 500;
    color: var(--gray-800);
}

/* ===== Data Table ===== */
.table-wrapper {
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    min-width: 560px;
}

.data-table th {
    background: var(--gray-50);
    padding: 12px 14px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--gray-600);
    text-align: left;
    border-bottom: 2px solid var(--gray-200);
    white-space: nowrap;
}

.data-table td {
    padding: 10px 14px;
    font-size: 0.95rem;
    border-bottom: 1px solid var(--gray-100);
    vertical-align: middle;
}

.data-table tbody tr:hover {
    background: var(--gray-50);
}

.data-table td[contenteditable="true"] {
    cursor: text;
    border-radius: 4px;
    transition: background var(--transition);
}

.data-table td[contenteditable="true"]:focus {
    outline: 2px solid var(--primary);
    outline-offset: -2px;
    background: var(--primary-bg);
}

.col-seq { width: 40px; text-align: center; }
.col-name { min-width: 200px; }
.col-qty { width: 70px; text-align: right; }
.col-price { width: 90px; text-align: right; }
.col-subtotal { width: 90px; text-align: right; }
.col-action { width: 50px; text-align: center; }

.data-table td.col-seq { text-align: center; color: var(--gray-500); }
.data-table td.col-qty,
.data-table td.col-price,
.data-table td.col-subtotal { text-align: right; }
.data-table td.col-action { text-align: center; }

.data-table td.col-subtotal {
    font-weight: 600;
    color: var(--gray-700);
}

.btn-delete-row {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border: none;
    background: transparent;
    border-radius: 50%;
    cursor: pointer;
    color: var(--gray-400);
    transition: all var(--transition);
}

.btn-delete-row:hover {
    background: var(--danger-light);
    color: var(--danger);
}

.table-actions {
    margin-top: 12px;
}

/* ===== Notice / Warning Box ===== */
.warning-box {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    margin-top: 16px;
    padding: 14px 16px;
    background: var(--danger-light);
    border: 1px solid #fca5a5;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    color: #7f1d1d;
}

.warning-box svg {
    color: var(--danger);
    flex-shrink: 0;
    margin-top: 1px;
}

.notice-box {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    margin-top: 16px;
    padding: 14px 16px;
    background: var(--warning-light);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    color: var(--gray-700);
}

.notice-box svg {
    color: var(--warning);
    flex-shrink: 0;
    margin-top: 1px;
}

/* ===== Form Card ===== */
.form-card {
    background: white;
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 20px;
}

.form-group {
    margin-bottom: 16px;
}

.form-group:last-child {
    margin-bottom: 0;
}

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: 6px;
}

.required {
    color: var(--danger);
}

.form-group select,
.form-group input[type="text"] {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-family: inherit;
    color: var(--gray-800);
    background: white;
    transition: border-color var(--transition), box-shadow var(--transition);
    appearance: none;
    -webkit-appearance: none;
}

.form-group select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}

.form-group select:focus,
.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.form-group-date {
    grid-column: 1 / -1;
}

.date-inputs {
    display: flex;
    gap: 12px;
}

.date-field {
    display: flex;
    align-items: center;
    gap: 6px;
}

.date-field input {
    width: 72px;
    padding: 10px 12px;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-family: inherit;
    text-align: center;
    color: var(--gray-800);
    transition: border-color var(--transition), box-shadow var(--transition);
}

.date-field input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.date-field span {
    font-size: 0.95rem;
    color: var(--gray-600);
}

/* ===== Preview Card ===== */
.preview-card {
    background: white;
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
}

.preview-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--gray-800);
}

.preview-summary {
    background: var(--gray-50);
    border-radius: var(--radius-sm);
    padding: 16px;
    margin-bottom: 24px;
    font-size: 0.95rem;
    line-height: 1.8;
}

.preview-summary .preview-row {
    display: flex;
    justify-content: space-between;
    padding: 4px 0;
}

.preview-summary .preview-label {
    color: var(--gray-500);
}

.preview-summary .preview-value {
    font-weight: 500;
    color: var(--gray-800);
}

.preview-summary .preview-total {
    border-top: 2px solid var(--gray-200);
    margin-top: 8px;
    padding-top: 8px;
    font-size: 1.1rem;
}

.preview-summary .preview-total .preview-value {
    color: var(--primary);
    font-weight: 700;
}

.generate-actions {
    text-align: center;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition);
}

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

.btn-primary:hover {
    background: var(--primary-hover);
    box-shadow: var(--shadow-md);
}

.btn-outline {
    background: white;
    color: var(--primary);
    border: 1px solid var(--primary);
}

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

.btn-lg {
    padding: 14px 32px;
    font-size: 1.05rem;
    border-radius: var(--radius);
}

.btn:active {
    transform: scale(0.98);
}

/* ===== Footer ===== */
.footer {
    margin-top: 48px;
    padding: 24px 0;
    text-align: center;
    color: var(--gray-500);
    font-size: 0.85rem;
    border-top: 1px solid var(--gray-200);
}

.footer-note {
    margin-top: 4px;
    font-size: 0.8rem;
    color: var(--gray-400);
}

/* ===== Loading Overlay ===== */
.loading-overlay {
    position: fixed;
    inset: 0;
    background: rgba(255,255,255,0.85);
    backdrop-filter: blur(4px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--gray-200);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.loading-overlay p {
    margin-top: 16px;
    font-size: 1rem;
    color: var(--gray-600);
}

/* ===== Toast ===== */
.toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.toast {
    padding: 14px 20px;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    color: white;
    box-shadow: var(--shadow-lg);
    animation: toastIn 0.3s ease;
    max-width: 360px;
}

.toast.success { background: var(--success); }
.toast.error { background: var(--danger); }
.toast.info { background: var(--primary); }

.toast.fade-out {
    animation: toastOut 0.3s ease forwards;
}

@keyframes toastIn {
    from { opacity: 0; transform: translateY(16px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes toastOut {
    from { opacity: 1; transform: translateY(0); }
    to { opacity: 0; transform: translateY(16px); }
}

/* ===== RWD: Tablet (768px) ===== */
@media (max-width: 768px) {
    .header {
        padding: 24px 0;
    }

    .header-title {
        font-size: 1.4rem;
    }

    .container {
        padding: 0 16px;
    }

    .info-grid {
        grid-template-columns: 1fr 1fr;
        gap: 12px;
    }

    .info-grid .info-item:last-child {
        grid-column: 1 / -1;
    }

    .form-grid {
        grid-template-columns: 1fr 1fr;
        gap: 16px;
    }

    .upload-area {
        padding: 36px 20px;
    }

    .form-card {
        padding: 20px;
    }
}

/* ===== RWD: Mobile (480px) ===== */
@media (max-width: 480px) {
    html {
        font-size: 15px;
    }

    .header {
        padding: 20px 0;
    }

    .header-title {
        font-size: 1.2rem;
    }

    .header-subtitle {
        font-size: 0.9rem;
    }

    .step-section {
        margin: 16px 0;
    }

    .step-header h2 {
        font-size: 1.1rem;
    }

    .info-grid {
        grid-template-columns: 1fr;
    }

    .info-grid .info-item:last-child {
        grid-column: auto;
    }

    .form-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .form-group-date {
        grid-column: auto;
    }

    .date-inputs {
        flex-wrap: wrap;
    }

    .upload-area {
        padding: 28px 16px;
    }

    .upload-icon svg {
        width: 48px;
        height: 48px;
    }

    .form-card {
        padding: 16px;
    }

    .preview-card {
        padding: 16px;
    }

    .btn-lg {
        width: 100%;
        justify-content: center;
        padding: 14px 20px;
    }

    .toast-container {
        left: 16px;
        right: 16px;
        bottom: 16px;
    }

    .toast {
        max-width: 100%;
    }

    .data-table {
        min-width: 500px;
    }

    .col-name {
        min-width: 160px;
    }
}