/* ========== 全局重置 ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* ========== CSS 变量 / 色系系统 ========== */
:root {
    --primary-color: #1e3a8a;
    --secondary-color: #3b82f6;
    --light-color: #dbeafe;
    --accent-color: #2563eb;
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --bg-gray: #f9fafb;
    --white: #ffffff;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

[data-color-scheme="green"] {
    --primary-color: #064e3b;
    --secondary-color: #059669;
    --light-color: #d1fae5;
    --accent-color: #047857;
}

[data-color-scheme="red"] {
    --primary-color: #7f1d1d;
    --secondary-color: #dc2626;
    --light-color: #fee2e2;
    --accent-color: #b91c1c;
}

[data-color-scheme="purple"] {
    --primary-color: #3b0764;
    --secondary-color: #7c3aed;
    --light-color: #ede9fe;
    --accent-color: #6d28d9;
}

[data-color-scheme="orange"] {
    --primary-color: #7c2d12;
    --secondary-color: #ea580c;
    --light-color: #ffedd5;
    --accent-color: #c2410c;
}

[data-color-scheme="dark"] {
    --primary-color: #1f2937;
    --secondary-color: #4b5563;
    --light-color: #f3f4f6;
    --accent-color: #374151;
}

/* ========== 页面基础 ========== */
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: linear-gradient(135deg, var(--light-color) 0%, var(--bg-gray) 100%);
    color: var(--text-dark);
    min-height: 100vh;
    line-height: 1.6;
}

.container {
    position: relative;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* ========== 头部 ========== */
.header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
    color: var(--white);
    padding: 30px;
    border-radius: 16px;
    margin-bottom: 30px;
    box-shadow: var(--shadow-lg);
    position: relative;
    min-height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.header-logo {
    position: absolute;
    top: 20px;
    left: 20px;
    width: 150px;
    height: auto;
    object-fit: contain;
}

.header-text {
    text-align: center;
    z-index: 1;
}

/* 顶部导航按钮（互链布料/袋子报价系统） */
.header-nav-link {
    position: absolute;
    top: 20px;
    right: 20px;
    padding: 10px 18px;
    background: var(--primary-color, #1e40af);
    color: #fff;
    text-decoration: none;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 600;
    display: flex;
    flex-direction: column;
    align-items: center;
    line-height: 1.3;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
    transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
    z-index: 20;
    border: 2px solid rgba(255,255,255,0.2);
}
.header-nav-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0,0,0,0.25);
    background: var(--accent-color, #f59e0b);
}
.header-nav-link .nav-main {
    font-size: 0.92rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 4px;
}
.header-nav-link .nav-arrow {
    font-size: 1.1rem;
    font-weight: 800;
}
.header-nav-link .nav-en {
    font-size: 0.68rem;
    opacity: 0.92;
    font-weight: 400;
    margin-top: 2px;
    letter-spacing: 0.5px;
}
@media (max-width: 768px) {
    .header-nav-link {
        position: static;
        margin: 12px auto 0;
        font-size: 0.82rem;
        padding: 8px 14px;
    }
}
@media (max-width: 480px) {
    .header-nav-link .nav-en {
        display: none;
    }
    .header-nav-link {
        padding: 6px 12px;
        font-size: 0.78rem;
    }
}

.header h1 {
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 2px;
    letter-spacing: 1px;
}

.subtitle-en {
    font-size: 1.0rem;
    opacity: 0.9;
    font-weight: 300;
}

/* ========== 色系选择器 ========== */
.color-scheme-selector {
    position: absolute;
    top: 20px;
    right: 20px;
}

.color-btn {
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    font-size: 24px;
    cursor: pointer;
    transition: all 0.3s;
    backdrop-filter: blur(10px);
}

.color-btn:hover {
    background: rgba(255, 255, 255, 0.35);
    transform: scale(1.1);
}

.color-panel {
    position: absolute;
    top: 60px;
    right: 0;
    background: var(--white);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    padding: 16px;
    z-index: 100;
    min-width: 260px;
}

.color-panel h3 {
    color: var(--text-dark);
    font-size: 1rem;
    margin-bottom: 12px;
}

.color-options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin-bottom: 16px;
}

.color-option {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 10px;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    background: white;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.85rem;
    color: var(--text-dark);
}

.color-option:hover {
    border-color: var(--accent-color);
    background: var(--light-color);
}

.color-option.active {
    border-color: var(--primary-color);
    background: var(--light-color);
}

.color-preview {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    flex-shrink: 0;
    border: 2px solid rgba(0,0,0,0.1);
}

.custom-color h4 {
    font-size: 0.9rem;
    color: var(--text-dark);
    margin-bottom: 10px;
}

.custom-color-inputs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.color-input-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.color-input-group label {
    font-size: 0.75rem;
    color: var(--text-light);
}

.color-input-group input[type="color"] {
    width: 100%;
    height: 36px;
    border: 1px solid #e5e7eb;
    border-radius: 6px;
    cursor: pointer;
    padding: 2px;
}

.apply-custom-btn {
    grid-column: 1 / -1;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    padding: 8px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: background 0.2s;
}

.apply-custom-btn:hover {
    background: var(--accent-color);
}

/* ========== 主体内容 ========== */
.main-content {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.section {
    background: var(--white);
    border-radius: 12px;
    padding: 24px;
    box-shadow: var(--shadow);
}

.section-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 16px;
    border-bottom: 2px solid var(--light-color);
    padding-bottom: 8px;
    display: flex;
    align-items: baseline;
    gap: 8px;
}

.section-en {
    font-size: 0.8rem;
    font-weight: 400;
    color: var(--text-light);
}

/* ========== 参数网格 ========== */
.params-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.param-item {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.param-item label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-dark);
}

.param-item small {
    font-size: 0.75rem;
    color: var(--text-light);
}

.param-hint {
    color: var(--text-light) !important;
    font-size: 0.72rem !important;
}

input[type="number"],
select {
    padding: 10px 14px;
    border: 2px solid #e5e7eb;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.2s;
    background: var(--bg-gray);
    color: var(--text-dark);
    width: 100%;
}

input[type="number"]:focus,
select:focus {
    outline: none;
    border-color: var(--accent-color);
    background: var(--white);
}

select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236b7280' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}

/* ========== 产品选择 ========== */
.product-select {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}

.select-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.select-group label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-dark);
}

/* ========== 尺寸提示 ========== */
.size-hint {
    margin-top: 14px;
    padding: 12px;
    background: var(--light-color);
    border-radius: 8px;
    font-size: 0.82rem;
    color: var(--text-dark);
    display: grid;
    gap: 4px;
}

.size-hint p {
    display: flex;
    align-items: center;
    gap: 6px;
}

/* ========== 利润选项 ========== */
.profit-options {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    border: 2px solid #e5e7eb;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.95rem;
    font-weight: 600;
    background: var(--bg-gray);
    color: var(--text-dark);
}

.checkbox-label:hover {
    border-color: var(--accent-color);
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary-color);
    cursor: pointer;
}

.checkbox-label:has(input:checked) {
    border-color: var(--primary-color);
    background: var(--light-color);
    color: var(--primary-color);
}

/* ========== 数量输入 ========== */
.quantity-input {
    max-width: 400px;
}

.input-group {
    display: flex;
    align-items: center;
    gap: 12px;
}

.input-group label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-dark);
    min-width: 60px;
}

.input-group input {
    flex: 1;
}

.input-suffix {
    font-size: 0.85rem;
    color: var(--text-light);
    white-space: nowrap;
}

/* ========== 税务选项 ========== */
.tax-options {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.radio-label {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    border: 2px solid #e5e7eb;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.95rem;
    font-weight: 600;
    background: var(--bg-gray);
    color: var(--text-dark);
}

.radio-label:hover {
    border-color: var(--accent-color);
}

.radio-label:has(input:checked) {
    border-color: var(--primary-color);
    background: var(--light-color);
    color: var(--primary-color);
}

.radio-label input[type="radio"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary-color);
    cursor: pointer;
}

/* ========== 计算按钮 ========== */
.calculate-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: var(--white);
    border: none;
    border-radius: 12px;
    padding: 18px;
    font-size: 1.3rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    letter-spacing: 1px;
}

.calculate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
    filter: brightness(1.05);
}

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

.btn-en {
    font-size: 0.85rem;
    font-weight: 400;
    opacity: 0.85;
}

/* ========== 标签 ========== */
.label-en {
    color: var(--text-light);
    font-size: 0.78em;
    font-weight: 400;
}

/* ========== 结果卡片 ========== */
.result-section {
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.result-card {
    background: var(--bg-gray);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 16px;
    border: 1px solid #e5e7eb;
}

.result-card-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 14px;
    padding-bottom: 8px;
    border-bottom: 1px solid #e5e7eb;
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0;
    border-bottom: 1px dashed #e5e7eb;
}

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

.result-label {
    font-size: 0.9rem;
    color: var(--text-dark);
    font-weight: 500;
}

.result-value {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--primary-color);
}

.result-item.highlight {
    background: var(--light-color);
    border-radius: 8px;
    padding: 10px 12px;
    margin: 4px 0;
    border: none;
}

.result-item.highlight .result-value {
    font-size: 1.1rem;
    color: var(--primary-color);
}

/* ========== 利润档位卡片 ========== */
.profit-card {
    background: var(--white);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 16px;
    box-shadow: var(--shadow);
    border-left: 5px solid var(--primary-color);
    transition: transform 0.2s;
}

.profit-card:hover {
    transform: translateX(4px);
}

.profit-card.profit-10 { border-left-color: #64748b; }
.profit-card.profit-15 { border-left-color: var(--secondary-color); }
.profit-card.profit-20 { border-left-color: var(--primary-color); }
.profit-card.profit-25 { border-left-color: #b91c1c; }

.profit-card-title {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.profit-card-title span {
    font-size: 0.8rem;
    background: var(--light-color);
    color: var(--primary-color);
    padding: 3px 10px;
    border-radius: 20px;
    font-weight: 600;
}

.profit-detail-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.profit-detail-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 6px 10px;
    background: var(--bg-gray);
    border-radius: 6px;
    font-size: 0.85rem;
}

.profit-detail-label {
    color: var(--text-light);
}

.profit-detail-value {
    font-weight: 700;
    color: var(--text-dark);
}

.profit-detail-value.highlight-unit {
    color: var(--primary-color);
    font-size: 1rem;
}

.profit-detail-value.highlight-total {
    color: #b91c1c;
    font-size: 1.1rem;
}

.result-item.total {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: 8px;
    padding: 12px 16px;
    color: white;
    margin-top: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.result-item.total .result-label {
    color: rgba(255,255,255,0.9);
    font-size: 0.9rem;
}

.result-item.total .result-value {
    color: white;
    font-size: 1.3rem;
}

/* ========== 底部 ========== */
.footer {
    margin-top: 30px;
    padding: 20px;
    text-align: center;
    color: var(--text-light);
    font-size: 0.85rem;
    line-height: 1.8;
}

.footer p {
    margin: 2px 0;
}

.footer-sub {
    font-size: 0.78rem !important;
    opacity: 0.7;
}

/* ========== 响应式 ========== */
@media (max-width: 768px) {
    .container {
        padding: 12px;
    }

    .header {
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 15px;
        padding: 25px 20px;
        min-height: unset;
    }

    .header-logo {
        position: relative;
        top: auto;
        left: auto;
        width: 150px;
        margin: 0 auto;
    }

    .header-text {
        text-align: center;
    }

    .header h1 {
        font-size: 1.5rem;
    }

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

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

    .color-options {
        grid-template-columns: 1fr;
    }

    .custom-color-inputs {
        grid-template-columns: 1fr;
    }

    .profit-options {
        flex-direction: column;
    }

    .checkbox-label {
        width: 100%;
    }

    .tax-options {
        flex-direction: column;
    }

    .radio-label {
        width: 100%;
    }

    .profit-detail-grid {
        grid-template-columns: 1fr;
    }

    .result-detail-grid {
        grid-template-columns: 1fr;
    }

    .section {
        padding: 18px;
    }

    .calculate-btn {
        padding: 15px;
        font-size: 1.1rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 8px;
    }

    .header {
        gap: 10px;
        padding: 18px 12px;
    }

    .header-logo {
        width: 130px;
    }

    .header h1 {
        font-size: 1.2rem;
    }

    .subtitle-en {
        font-size: 0.8rem;
    }

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

    .section {
        padding: 14px;
    }

    .section-title {
        font-size: 1.05rem;
    }

    .input-group {
        flex-direction: column;
        align-items: flex-start;
        gap: 6px;
    }

    .calculate-btn {
        padding: 14px;
        font-size: 1rem;
    }

    .profit-card-title {
        font-size: 1rem;
    }

    .result-item.total .result-value {
        font-size: 1.1rem;
    }
}