:root {
    --primary-color: #4a90e2;
    --success-color: #2ecc71;
    --danger-color: #e74c3c;
    --text-color: #333;
    --bg-light: #f4f6f8;
    --border-color: #ddd;
}

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

body {
    font-family: 'Inter', 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    color: var(--text-color);
    background-color: #f8fafc; /* Light cool gray background */
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

.top-nav {
    background-color: #fff;
    border-bottom: 1px solid #e2e8f0;
    padding: 0 40px;
    display: flex;
    justify-content: center;
    height: 60px;
    align-items: center;
    gap: 40px;
    flex-shrink: 0;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.nav-item {
    text-decoration: none;
    color: #666;
    font-size: 15px;
    font-weight: 500;
    height: 100%;
    display: flex;
    align-items: center;
    position: relative;
    transition: color 0.3s;
}

.nav-item:hover {
    color: var(--primary-color);
}

.nav-item.active {
    color: var(--primary-color);
    font-weight: 700;
}

.nav-item.active::after {
    content: "";
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    height: 3px;
    background-color: var(--primary-color);
    border-radius: 3px 3px 0 0;
}

.container {
    display: flex;
    flex: 1;
    padding: 30px 40px; /* Added padding around the panels */
    gap: 30px; /* Space between the two cards */
    max-width: 1440px;
    margin: 0 auto;
    width: 100%;
    overflow: hidden;
}

/* Left Panel */
.left-panel {
    flex: 1;
    max-width: 600px;
    background-color: #fff;
    padding: 35px;
    border-radius: 12px; /* Rounded corners for card feel */
    border: 1px solid #e2e8f0;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 20px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

.panel-title-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.left-panel h1 {
    font-size: 20px;
    margin-bottom: 5px;
    color: var(--primary-color); /* Use primary blue for headers */
    font-weight: 700;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 5px;
    margin-bottom: 10px;
}

.form-row {
    display: flex;
    gap: 10px;
}

.form-row .form-group {
    flex: 1;
}

label {
    font-weight: 600;
    font-size: 14px;
    color: #555;
}

input[type="text"],
input[type="number"],
textarea,
select {
    width: 100%; /* Ensure inputs take full width of container */
    padding: 12px 14px;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    font-size: 14px;
    color: #1e293b;
    background-color: #fff;
    transition: all 0.2s ease;
}

input:focus, textarea:focus, select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.1);
}

.image-preview-box {
    width: 120px;
    height: 120px;
    border: 2px dashed #e2e8f0;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #94a3b8;
    overflow: hidden;
    margin-top: 8px;
    background-color: #f8fafc;
    transition: all 0.2s ease;
}

.image-preview-box:hover {
    border-color: var(--primary-color);
    background-color: #eff6ff;
}

.image-preview-box img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    font-size: 14px;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.primary-btn {
    background-color: var(--primary-color);
    color: white;
    box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}
.primary-btn:hover { 
    background-color: #3b82f6; 
    transform: translateY(-1px);
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.secondary-btn {
    background-color: #fff;
    color: #64748b;
    border: 1px solid #e2e8f0;
}
.secondary-btn:hover { 
    background-color: #f8fafc;
    color: #1e293b;
}

.success-btn {
    background-color: #3b82f6; /* Modern Blue */
    color: white;
}
.success-btn:hover { background-color: #2563eb; }

.save-actions {
    display: flex;
    gap: 12px;
}

.whatsapp-btn {
    background-color: #22c55e; /* WhatsApp Green */
    color: white;
}

.whatsapp-btn:hover {
    background-color: #16a34a;
    transform: translateY(-1px);
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.text-btn {
    background: transparent;
    color: #777;
    text-decoration: underline;
}

hr {
    border: 0;
    border-top: 1px solid #eee;
    margin: 10px 0;
}

/* Product List in Left Panel */
.product-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.list-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px;
    border: 1px solid #eee;
    border-radius: 6px;
    background-color: #fafafa;
}

.list-item img {
    width: 50px;
    height: 50px;
    object-fit: cover;
    border-radius: 4px;
    background-color: #ddd;
}

.list-item-info {
    flex: 1;
}

.list-item-title {
    font-weight: bold;
    font-size: 14px;
}

.list-item-desc {
    font-size: 12px;
    color: #666;
}

.list-actions {
    display: flex;
    gap: 5px;
}

.action-btn {
    padding: 5px 10px;
    font-size: 12px;
    border-radius: 4px;
    cursor: pointer;
    border: none;
}
.edit-btn { background-color: #e0e0e0; color: #333; }
.del-btn { background-color: #ffe0e0; color: var(--danger-color); }

/* Right Panel */
.right-panel {
    flex: 1.2;
    background-color: transparent;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 20px;
    overflow-y: auto;
}

.preview-container {
    background-color: #fff;
    padding: 35px;
    border-radius: 12px;
    border: 1px solid #e2e8f0;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.preview-header-actions {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
}

.preview-header-actions h2 {
    font-size: 20px;
    color: var(--primary-color);
    font-weight: 700;
}

.order-preview {
    width: 100%;
    max-width: 500px;
    margin: 0 auto;
    background: white;
    min-height: 600px;
    padding: 30px; /* Reduced from 40px for a more compact look */
    border-radius: 4px;
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    height: auto;
    box-sizing: border-box; /* Ensure padding doesn't add to width */
}

.order-header {
    text-align: center;
    border-bottom: 2px solid #000;
    padding-bottom: 15px;
    margin-bottom: 20px;
}

.order-header h2 {
    font-size: 22px;
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: #000;
}

.header-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    color: #333;
}

.header-row .customer {
    text-align: left;
    font-weight: 500;
    /* Removed visibility: hidden to ensure layout consistency */
}

.header-row .date {
    text-align: right;
}

.order-items {
    flex: 1;
}

.order-preview.invoice-mode .order-header {
    border-bottom: 1px solid #000;
}

.order-preview.invoice-mode .order-footer {
    border-top: 1px solid #000;
}

.invoice-table-head,
.invoice-line {
    display: grid;
    grid-template-columns: 1fr 56px 86px 92px;
    gap: 10px;
    align-items: center;
}

.invoice-table-head {
    font-size: 14px;
    font-weight: 700;
    color: #000;
    padding: 8px 0;
    border-bottom: 1px solid #e5e7eb;
    margin-bottom: 10px;
}

.invoice-line {
    font-size: 15px;
    color: #111;
    padding: 8px 0;
    border-bottom: 1px solid #f0f0f0;
}

.invoice-line:last-child {
    border-bottom: none;
}

.invoice-table-head .c-qty,
.invoice-line .c-qty {
    text-align: right;
    white-space: nowrap;
}

.invoice-table-head .c-unit,
.invoice-line .c-unit,
.invoice-table-head .c-amount,
.invoice-line .c-amount {
    text-align: right;
    white-space: nowrap;
}

.invoice-line .c-item {
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.order-preview.invoice-mode .header-row {
    display: none;
}

.order-preview.invoice-mode .original-price-row {
    color: #111;
}

.order-preview.invoice-mode .original-price-group {
    opacity: 1;
}

.order-preview.invoice-mode .original-price-group::after {
    content: none;
}

.invoice-meta {
    margin-top: 6px;
}

.invoice-meta-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    grid-template-rows: auto auto;
    column-gap: 24px;
    row-gap: 6px;
    font-size: 14px;
    color: #0f172a;
}

.invoice-meta-item {
    display: flex;
    flex-direction: row;
    align-items: baseline;
    justify-content: flex-start;
    gap: 6px;
    padding: 0;
    border: 0;
    border-radius: 0;
    background: transparent;
    min-width: 0;
}

.invoice-meta-item:nth-child(1) {
    grid-column: 1;
    grid-row: 1;
}

.invoice-meta-item:nth-child(2) {
    grid-column: 1;
    grid-row: 2;
}

.invoice-meta-item:nth-child(3) {
    grid-column: 2;
    grid-row: 2;
}

.invoice-meta-item .k {
    font-size: 13px;
    font-weight: 600;
    color: #64748b;
    white-space: nowrap;
}

.invoice-meta-item .k::after {
    content: ':';
    margin-left: 2px;
}

.invoice-meta-item .v {
    font-size: 14px;
    font-weight: 700;
    color: #0f172a;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    min-width: 0;
}

@media (max-width: 360px) {
    .invoice-meta-grid {
        grid-template-columns: minmax(0, 1fr);
        grid-template-rows: auto;
    }

    .invoice-meta-item {
        grid-column: auto;
        grid-row: auto;
    }
}

.invoice-parties {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
    margin: 14px 0 8px;
}

.invoice-party-title {
    font-weight: 700;
    font-size: 15px;
    color: #000;
    margin-bottom: 6px;
}

.invoice-party-line {
    font-size: 14px;
    color: #111;
    white-space: pre-wrap;
}

.invoice-party-sub {
    display: flex;
    gap: 10px;
    margin-top: 6px;
    font-size: 13px;
    color: #555;
    flex-wrap: wrap;
}

.invoice-notes {
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px solid #eee;
    font-size: 14px;
    color: #333;
    white-space: pre-wrap;
}

.order-preview.invoice-mode .total-row {
    font-size: 16px;
}

.order-preview.invoice-mode .main-total {
    font-size: 14px;
}

.invoice-items-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.invoice-items-editor {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.invoice-edit-head {
    display: grid;
    grid-template-columns: 1fr 70px 90px 96px 30px;
    gap: 8px;
    font-size: 12px;
    font-weight: 700;
    color: #111;
    padding: 8px 0;
    border-bottom: 1px solid #e5e7eb;
}

.invoice-edit-row {
    display: grid;
    grid-template-columns: 1fr 70px 90px 96px 30px;
    gap: 8px;
    align-items: center;
}

.invoice-edit-row input {
    padding: 10px 12px;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    font-size: 13px;
}

.invoice-edit-qty,
.invoice-edit-unit {
    text-align: right;
}

.invoice-edit-amount {
    text-align: right;
    font-weight: 600;
    color: #111;
    font-size: 13px;
}

.invoice-edit-remove {
    padding: 0;
    width: 30px;
    height: 30px;
    justify-content: center;
    text-decoration: none;
}

.preview-item {
    display: flex;
    gap: 12px;
    margin-bottom: 15px;
    border-bottom: 1px solid #f0f0f0;
    padding-bottom: 12px;
    align-items: flex-start;
}

.preview-item:last-child {
    border-bottom: none;
}

.preview-img {
    width: 140px;
    height: 140px;
    border-radius: 4px;
    background-color: #f0f0f0;
    flex-shrink: 0;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.preview-img-contain {
    border-radius: 4px;
    background-color: transparent;
    flex-shrink: 0;
    max-width: 160px; /* Cap width to prevent excessive height */
    height: auto;
}

.preview-details {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.preview-title {
    font-weight: 600;
    font-size: 15px;
    color: #000;
    margin-bottom: 4px;
}

.preview-note {
    font-size: 13px;
    color: #777;
    margin-top: 2px;
    font-style: italic;
    white-space: pre-wrap;
}

.preview-price-row {
    display: flex;
    justify-content: space-between;
    align-items: center; /* 居中对齐，确保单价行和小计在一条线上 */
    margin-top: 8px;
    font-size: 13px;
    flex-wrap: nowrap; /* 强制不换行 */
}

.preview-price-row .price {
    color: #333;
    white-space: nowrap; /* 确保单价和数量不拆行 */
    flex: 1; /* 占据剩余空间 */
}

.preview-price-row .subtotal {
    font-weight: 600;
    color: #1a1a1a;
}

.empty-state {
    text-align: center;
    color: #ccc;
    margin-top: 50px;
    font-size: 16px;
}

.order-footer {
    border-top: 2px solid #000;
    padding-top: 15px;
    margin-top: 10px;
}

.total-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
    font-size: 14px;
    color: #333;
}

.main-total {
    font-size: 12px; /* Changed from 16px to 12px as requested */
    font-weight: 600;
    color: #000;
    margin-top: 12px;
    padding-top: 10px;
    border-top: 1px solid #eee;
}

.total-price-group {
    display: flex;
    align-items: baseline;
    gap: 5px; /* Gap between Code (USD) and Symbol ($) */
}

.final-amount {
    display: flex;
    align-items: baseline;
    gap: 0; /* Symbol ($) and Amount (0.00) tight */
}

.main-total .currency {
    font-size: inherit; /* Match parent font size */
    margin-right: 0;
}

.original-price-row {
    color: #666;
    font-size: 14px;
}

.original-price-group {
    position: relative;
    opacity: 0.7;
    display: inline-block;
}

.original-price-group::after {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 100%;
    height: 1px;
    background-color: currentColor;
    transform: translateY(-50%);
}

/* Responsive adjustments */
@media (max-width: 1024px) {
    .container {
        flex-direction: column;
        padding: 20px;
        overflow: auto;
    }
    .left-panel {
        max-width: 100%;
        overflow: visible;
        padding: 25px;
    }
    .right-panel {
        overflow: visible;
    }
    .form-row {
        flex-wrap: wrap; /* Allow price and quantity to stack if needed */
    }
    .form-row .form-group {
        min-width: 120px; /* Prevent shrinking too much */
    }
}

/* 响应式调整 */
@media screen and (max-width: 480px) {
    .top-nav {
        padding: 0 10px;
        gap: 15px;
        height: 50px;
    }
    .nav-item {
        font-size: 13px;
    }
    .container {
        padding: 10px;
    }
    .left-panel, .right-panel {
        padding: 10px; /* 进一步减小面板边距 */
    }
    .order-preview {
        padding: 20px 20px; /* 增加左右内边距，使内容不紧贴边缘 */
    }
    .order-header h2 {
        font-size: 15px; /* 手机端字体改为15 */
    }
    .form-row .form-group {
        flex: 1 1 100%; /* Stack price and quantity on very small screens */
    }
    .preview-header-actions {
        flex-direction: column;
        gap: 15px;
        align-items: flex-start;
    }
    .save-actions {
        width: 100%;
        flex-direction: column;
    }
    .save-actions .btn {
        width: 100%;
    }
    .preview-item {
        gap: 10px; /* 缩小间距给文字留空间 */
    }
    .preview-img-contain {
        max-width: 160px; /* 手机端也改回 160px 宽度 */
    }
    .preview-price-row {
        justify-content: flex-end; /* 将 $100.00 x 1 靠右对齐 */
        text-align: right;
    }
    
    .preview-price-row .subtotal {
        display: none; /* 手机端删除（隐藏）后面的小计金额 */
    }
}