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

:root {
    --color-black: #000000;
    --color-white: #FFFFFF;
    --color-gray-50: #FAFAFA;
    --color-gray-100: #F5F5F5;
    --color-gray-200: #E5E5E5;
    --color-gray-300: #D4D4D4;
    --color-gray-400: #A3A3A3;
    --color-gray-500: #737373;
    --color-gray-600: #525252;
    --color-gray-700: #404040;
    --color-gray-800: #262626;
    --color-gray-900: #171717;
    --color-primary: #006580;
    --color-primary-dark: #004d61;
    --color-primary-light: #E6F4F7;
    --color-accent: #00A8B5;
    --color-accent-light: #E6F7F8;
    --spacing-unit: 8px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    font-size: 15px;
    line-height: 1.6;
    color: var(--color-gray-900);
    background: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 calc(var(--spacing-unit) * 3);
}

/* 导航栏 - 极简 */
nav {
    height: 72px;
    border-bottom: 1px solid var(--color-gray-200);
    background: var(--color-white);
    position: sticky;
    top: 0;
    z-index: 100;
}

nav::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    height: 2px;
    background: var(--color-primary);
    width: var(--scroll-progress, 0%);
    transition: none;
}

nav .container {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-size: 16px;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--color-black);
    display: flex;
    align-items: center;
    gap: calc(var(--spacing-unit) * 1.5);
}

.logo img {
    height: 32px;
    width: auto;
}

.nav-links {
    display: flex;
    gap: calc(var(--spacing-unit) * 5);
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
}

.nav-link {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-gray-600);
    text-decoration: none;
    transition: color 0.15s;
}

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

.btn {
    padding: calc(var(--spacing-unit) * 1.75) calc(var(--spacing-unit) * 4);
    font-size: 15px;
    font-weight: 600;
    border: 2px solid var(--color-primary);
    background: var(--color-primary);
    color: var(--color-white);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 12px;
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s ease;
    z-index: -1;
}

.btn:hover::before {
    left: 100%;
}

.btn:hover {
    background: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    transform: translateY(-3px);
    box-shadow: 0 12px 24px rgba(0, 101, 128, 0.3);
}

.btn:active {
    transform: translateY(-1px);
    box-shadow: 0 6px 12px rgba(0, 101, 128, 0.2);
}

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

.btn-outline:hover {
    background: var(--color-primary);
    color: var(--color-white);
    box-shadow: 0 12px 24px rgba(0, 101, 128, 0.3);
}

.btn-outline::before {
    background: linear-gradient(90deg, transparent, rgba(0, 101, 128, 0.1), transparent);
}

/* Hero区域 - 网格布局 */
.hero {
    padding: calc(var(--spacing-unit) * 3) 0 calc(var(--spacing-unit) * 2) 0;
    border-bottom: 1px solid var(--color-gray-200);
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-white) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 50%;
    height: 100%;
    background: url('trae_bg_pattern.jpg') no-repeat center right;
    background-size: cover;
    opacity: 0.1;
    z-index: 0;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: calc(var(--spacing-unit) * 4);
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: 48px;
    font-weight: 700;
    line-height: 1.05;
    letter-spacing: -0.03em;
    color: var(--color-black);
    margin-bottom: calc(var(--spacing-unit) * 2);
    text-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.hero h1 .gradient-text {
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
    animation: gradientShift 3s ease-in-out infinite;
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    border-radius: 24px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    background: var(--color-primary);
    color: var(--color-white);
    margin-bottom: calc(var(--spacing-unit) * 2);
    box-shadow: 0 4px 12px rgba(0, 101, 128, 0.2);
    transition: all 0.3s ease;
}

.hero-badge:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0, 101, 128, 0.3);
}

.hero-badge::before {
    content: '';
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-white);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.2); opacity: 0.7; }
}

.hero p {
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-gray-700);
    margin-bottom: calc(var(--spacing-unit) * 3);
    font-weight: 400;
}

.stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: calc(var(--spacing-unit) * 3);
    margin-top: calc(var(--spacing-unit) * 4);
}

.stat-item {
    border: 1px solid var(--color-gray-200);
    padding: calc(var(--spacing-unit) * 4);
    text-align: center;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    background: var(--color-white);
    border-radius: 16px;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

.stat-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease;
}

.stat-item:hover::before {
    transform: scaleX(1);
}

.stat-item:hover {
    border-color: var(--color-primary);
    box-shadow: 0 12px 32px rgba(0, 101, 128, 0.2);
    transform: translateY(-8px);
}

.stat-item:hover .stat-value {
    color: var(--color-primary);
    transform: scale(1.1);
}

.stat-item:hover .stat-label {
    color: var(--color-gray-600);
}

.stat-value {
    font-size: 36px;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: calc(var(--spacing-unit) * 1);
    transition: all 0.3s ease;
    display: block;
}

.stat-label {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-gray-500);
    transition: color 0.3s ease;
    display: block;
}

.hero-slider {
    position: relative;
    width: 100%;
    height: 430px;
    min-height: 430px;
    display: block;
    border-radius: 20px;
    overflow: hidden;
    border: 1px solid var(--color-gray-200);
    box-shadow: 0 24px 48px rgba(0,0,0,0.15);
    background-color: #f3f4f6;
    background-image: url('mx1.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    transition: background-image 0.6s ease, transform 0.4s ease;
}

.hero-slider::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(0, 101, 128, 0.08) 0%, rgba(0, 168, 181, 0.04) 100%);
    z-index: 1;
    pointer-events: none;
}

.hero-slider:hover {
    transform: scale(1.02) translateY(-4px);
}

/* Section标题 */
.section {
    padding: calc(var(--spacing-unit) * 6) 0;
    border-bottom: 1px solid var(--color-gray-200);
}

.section.dark {
    background: var(--color-primary-dark);
    border-bottom-color: var(--color-primary);
}

.section.light-bg {
    background: var(--color-gray-50);
}

.section.dark .section-title {
    color: var(--color-accent);
}

.section.dark .section-heading {
    color: var(--color-white);
}

.section-header {
    margin-bottom: calc(var(--spacing-unit) * 4);
}

.section-title {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-gray-500);
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.section-heading {
    font-size: 36px;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--color-black);
}

/* 选项卡 */
.tabs {
    display: flex;
    gap: calc(var(--spacing-unit) * 4);
    margin-bottom: calc(var(--spacing-unit) * 6);
    border-bottom: 1px solid var(--color-gray-200);
}

.tab {
    padding: calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 3);
    font-size: 14px;
    font-weight: 500;
    color: var(--color-gray-500);
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    transition: all 0.15s;
    position: relative;
    bottom: -1px;
}

.tab:hover {
    color: var(--color-gray-900);
    background: var(--color-gray-50);
}

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

/* 案例网格 */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: calc(var(--spacing-unit) * 3);
}

.case-card {
    border: 1px solid var(--color-gray-200);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    border-radius: 12px;
    background: var(--color-white);
}

.case-card:hover {
    border-color: var(--color-primary);
    box-shadow: 0 12px 32px rgba(0,0,0,0.12);
    transform: translateY(-8px);
}

.case-card::after {
    display: none;
}

.case-image {
    width: 100%;
    height: 280px;
    object-fit: cover;
    display: block;
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.case-card:hover .case-image {
    transform: scale(1.1);
}

.case-content {
    padding: calc(var(--spacing-unit) * 3);
}

.case-meta {
    display: flex;
    justify-content: space-between;
    font-size: 11px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-gray-500);
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.case-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-black);
    margin-bottom: calc(var(--spacing-unit) * 1);
}

.case-desc {
    font-size: 14px;
    line-height: 1.6;
    color: var(--color-gray-600);
}

/* 工艺技术 */
.process-section {
    padding: calc(var(--spacing-unit) * 12) 0;
    background: var(--color-gray-50);
    border-bottom: 1px solid var(--color-gray-200);
}

.process-timeline {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0;
    position: relative;
    margin-top: calc(var(--spacing-unit) * 8);
}

.process-timeline::before {
    content: '';
    position: absolute;
    top: 24px;
    left: 12.5%;
    right: 12.5%;
    height: 2px;
    background: var(--color-gray-200);
    z-index: 0;
}

.process-step {
    text-align: center;
    position: relative;
    z-index: 1;
}

.process-number {
    width: 48px;
    height: 48px;
    margin: 0 auto calc(var(--spacing-unit) * 3);
    border: 2px solid var(--color-primary);
    background: var(--color-white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: 600;
    color: var(--color-primary);
    transition: all 0.2s;
}

.process-step:hover .process-number {
    background: var(--color-primary);
    color: var(--color-white);
    transform: scale(1.1);
}

.process-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-black);
    margin-bottom: calc(var(--spacing-unit) * 1);
}

.process-desc {
    font-size: 13px;
    color: var(--color-gray-600);
    line-height: 1.6;
}

.process-time {
    font-size: 11px;
    font-weight: 600;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: calc(var(--spacing-unit) * 1);
}

@media (max-width: 768px) {
    .process-timeline {
        grid-template-columns: 1fr;
        gap: calc(var(--spacing-unit) * 4);
    }
    
    .process-timeline::before {
        display: none;
    }
}

/* 工艺技术 */
.tech-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: calc(var(--spacing-unit) * 3);
}

.tech-item {
    border: 1px solid var(--color-gray-200);
    padding: calc(var(--spacing-unit) * 4);
    background: var(--color-white);
    transition: all 0.15s;
}

.section.dark .tech-item {
    border-color: var(--color-primary);
    background: transparent;
}

.section.dark .tech-item:hover {
    background: rgba(255, 255, 255, 0.05);
}

.tech-number {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-accent);
    margin-bottom: calc(var(--spacing-unit) * 2);
    display: inline-block;
    padding: calc(var(--spacing-unit) * 1) calc(var(--spacing-unit) * 2);
    background: var(--color-accent-light);
}

.section.dark .tech-number {
    background: var(--color-accent);
    color: var(--color-white);
}

.tech-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--color-black);
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.section.dark .tech-title {
    color: var(--color-white);
}

.tech-desc {
    font-size: 14px;
    line-height: 1.7;
    color: var(--color-gray-600);
}

.section.dark .tech-desc {
    color: var(--color-gray-300);
}

/* 表单 */
.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: calc(var(--spacing-unit) * 8);
}

.form-group {
    margin-bottom: calc(var(--spacing-unit) * 3);
}

.form-label {
    display: block;
    font-size: 12px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-gray-600);
    margin-bottom: calc(var(--spacing-unit) * 1);
}

input, select, textarea {
    width: 100%;
    padding: calc(var(--spacing-unit) * 2);
    font-family: inherit;
    font-size: 14px;
    border: 1px solid var(--color-gray-300);
    background: var(--color-white);
    transition: border-color 0.15s;
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--color-primary);
}

textarea {
    resize: vertical;
    min-height: 120px;
}

/* Footer */
.clients-section {
    padding: calc(var(--spacing-unit) * 8) 0;
    background: var(--color-white);
    border-bottom: 1px solid var(--color-gray-200);
}

.clients-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: calc(var(--spacing-unit) * 4);
    align-items: center;
}

.client-logo {
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: calc(var(--spacing-unit) * 2);
    border: 1px solid var(--color-gray-200);
    opacity: 0.6;
    transition: all 0.15s;
    font-size: 12px;
    font-weight: 600;
    color: var(--color-gray-400);
    text-align: center;
}

.client-logo:hover {
    opacity: 1;
    border-color: var(--color-primary);
    color: var(--color-primary);
}

@media (max-width: 768px) {
    .clients-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Footer */
footer {
    padding: calc(var(--spacing-unit) * 8) 0;
    background: var(--color-gray-50);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: calc(var(--spacing-unit) * 8);
}

.footer-title {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-gray-500);
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.footer-text {
    font-size: 14px;
    line-height: 1.7;
    color: var(--color-gray-600);
}

.footer-link {
    display: block;
    font-size: 14px;
    color: var(--color-gray-600);
    text-decoration: none;
    margin-bottom: calc(var(--spacing-unit) * 1);
    transition: color 0.15s;
}

.footer-link:hover {
    color: var(--color-black);
}

.footer-bottom {
    margin-top: calc(var(--spacing-unit) * 6);
    padding-top: calc(var(--spacing-unit) * 3);
    border-top: 1px solid var(--color-gray-200);
    font-size: 12px;
    color: var(--color-gray-500);
}

/* 自定义滚动条 */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-gray-100);
}

::-webkit-scrollbar-thumb {
    background: var(--color-gray-300);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-gray-400);
}

/* 双轨制业务 */
.dual-business-section {
    padding: calc(var(--spacing-unit) * 10) 0;
    background: linear-gradient(135deg, var(--color-white) 0%, var(--color-primary-light) 100%);
    border-bottom: 1px solid var(--color-gray-200);
    position: relative;
    overflow: hidden;
}

.dual-business-section::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80%;
    height: 60%;
    background: url('bg_dual_business.jpg') no-repeat center;
    background-size: cover;
    opacity: 0.05;
    z-index: 0;
}

.dual-business-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: calc(var(--spacing-unit) * 8);
    margin-top: calc(var(--spacing-unit) * 8);
    position: relative;
    z-index: 1;
}

.business-card {
    border: 1px solid var(--color-gray-200);
    padding: calc(var(--spacing-unit) * 6);
    border-radius: 20px;
    background: var(--color-white);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    box-shadow: 0 8px 24px rgba(0,0,0,0.08);
}

.business-card:hover {
    border-color: var(--color-primary);
    box-shadow: 0 20px 48px rgba(0, 101, 128, 0.2);
    transform: translateY(-12px);
}

.business-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 6px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease;
}

.business-card:hover::before {
    transform: scaleX(1);
}

.business-icon {
    width: 120px;
    height: 120px;
    margin: 0 auto calc(var(--spacing-unit) * 5);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary-light);
    color: var(--color-primary);
    border-radius: 50%;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    z-index: 1;
}

.business-icon::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80%;
    height: 80%;
    background: rgba(255,255,255,0.3);
    border-radius: 50%;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.business-card:hover .business-icon {
    background: var(--color-primary);
    color: var(--color-white);
    transform: scale(1.15) rotate(5deg);
    box-shadow: 0 12px 32px rgba(0, 101, 128, 0.3);
}

.business-card:hover .business-icon::before {
    opacity: 1;
}

.business-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--color-black);
    text-align: center;
    margin-bottom: calc(var(--spacing-unit) * 4);
    text-shadow: 0 2px 4px rgba(0,0,0,0.05);
    transition: color 0.3s ease;
}

.business-card:hover .business-title {
    color: var(--color-primary);
}

.business-desc {
    font-size: 17px;
    line-height: 1.7;
    color: var(--color-gray-700);
    text-align: center;
    margin-bottom: calc(var(--spacing-unit) * 5);
    transition: color 0.3s ease;
}

.business-card:hover .business-desc {
    color: var(--color-gray-800);
}

.business-features {
    list-style: none;
    margin-bottom: calc(var(--spacing-unit) * 5);
    padding: 0 calc(var(--spacing-unit) * 2);
}

.business-features li {
    font-size: 15px;
    color: var(--color-gray-700);
    margin-bottom: calc(var(--spacing-unit) * 2);
    display: flex;
    align-items: center;
    transition: all 0.3s ease;
    padding: calc(var(--spacing-unit) * 1.5);
    border-radius: 8px;
    background: var(--color-gray-50);
    border-left: 4px solid var(--color-primary-light);
}

.business-features li:hover {
    background: var(--color-primary-light);
    border-left-color: var(--color-primary);
    transform: translateX(8px);
}

.business-features li::before {
    content: '✓';
    color: var(--color-accent);
    font-weight: 600;
    margin-right: calc(var(--spacing-unit) * 2);
    font-size: 16px;
    transition: transform 0.3s ease;
}

.business-features li:hover::before {
    transform: scale(1.2);
    color: var(--color-primary);
}

.business-highlights {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: calc(var(--spacing-unit) * 4);
    margin: calc(var(--spacing-unit) * 5) 0;
    padding: calc(var(--spacing-unit) * 4);
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-white) 100%);
    border-radius: 16px;
    border: 1px solid var(--color-gray-200);
    transition: all 0.3s ease;
}

.business-card:hover .business-highlights {
    border-color: var(--color-primary);
    box-shadow: 0 8px 24px rgba(0, 101, 128, 0.15);
}

.highlight-item {
    text-align: center;
    padding: calc(var(--spacing-unit) * 2);
    border-radius: 12px;
    background: var(--color-white);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.highlight-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--color-accent);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s ease;
}

.highlight-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 16px rgba(0,0,0,0.1);
}

.highlight-item:hover::before {
    transform: scaleX(1);
}

.highlight-value {
    display: block;
    font-size: 28px;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: calc(var(--spacing-unit) * 1);
    transition: all 0.3s ease;
}

.highlight-item:hover .highlight-value {
    color: var(--color-accent);
    transform: scale(1.1);
}

.highlight-label {
    font-size: 13px;
    color: var(--color-gray-600);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
    transition: color 0.3s ease;
}

.highlight-item:hover .highlight-label {
    color: var(--color-gray-700);
}

.business-card .btn {
    display: block;
    width: 100%;
    text-align: center;
    margin-top: calc(var(--spacing-unit) * 4);
}

/* 服务类型 */
.services-section {
    padding: calc(var(--spacing-unit) * 10) 0;
    background: linear-gradient(135deg, var(--color-white) 0%, var(--color-gray-50) 100%);
    border-bottom: 1px solid var(--color-gray-200);
    position: relative;
    overflow: hidden;
}

.services-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('bg_services.jpg') no-repeat center;
    background-size: cover;
    opacity: 0.03;
    z-index: 0;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: calc(var(--spacing-unit) * 5);
    margin-top: calc(var(--spacing-unit) * 8);
    position: relative;
    z-index: 1;
}

.service-item {
    border: 1px solid var(--color-gray-200);
    padding: calc(var(--spacing-unit) * 5);
    text-align: center;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 16px;
    background: var(--color-white);
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 16px rgba(0,0,0,0.08);
}

.service-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease;
}

.service-item:hover {
    border-color: var(--color-primary);
    box-shadow: 0 16px 40px rgba(0, 101, 128, 0.2);
    transform: translateY(-12px);
}

.service-item:hover::before {
    transform: scaleX(1);
}

.service-icon {
    width: 100px;
    height: 100px;
    margin: 0 auto calc(var(--spacing-unit) * 4);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary-light);
    color: var(--color-primary);
    border-radius: 50%;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    z-index: 1;
    box-shadow: 0 4px 12px rgba(0, 101, 128, 0.15);
}

.service-icon::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80%;
    height: 80%;
    background: rgba(255,255,255,0.3);
    border-radius: 50%;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.service-item:hover .service-icon {
    background: var(--color-primary);
    color: var(--color-white);
    transform: scale(1.15) rotate(5deg);
    box-shadow: 0 8px 24px rgba(0, 101, 128, 0.3);
}

.service-item:hover .service-icon::before {
    opacity: 1;
}

.service-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-black);
    margin-bottom: calc(var(--spacing-unit) * 3);
    transition: color 0.3s ease;
}

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

.service-desc {
    font-size: 15px;
    line-height: 1.7;
    color: var(--color-gray-700);
    transition: color 0.3s ease;
}

.service-item:hover .service-desc {
    color: var(--color-gray-800);
}

/* 优势部分 */
.advantages-section {
    padding: calc(var(--spacing-unit) * 10) 0;
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-white) 100%);
    border-bottom: 1px solid var(--color-gray-200);
    position: relative;
    overflow: hidden;
}

.advantages-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('bg_advantages.jpg') no-repeat center;
    background-size: cover;
    opacity: 0.05;
    z-index: 0;
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: calc(var(--spacing-unit) * 5);
    margin-top: calc(var(--spacing-unit) * 8);
    position: relative;
    z-index: 1;
}

.advantage-item {
    border: 1px solid var(--color-gray-200);
    padding: calc(var(--spacing-unit) * 5);
    text-align: center;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 16px;
    background: var(--color-white);
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 16px rgba(0,0,0,0.08);
}

.advantage-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease;
}

.advantage-item:hover {
    border-color: var(--color-primary);
    box-shadow: 0 16px 40px rgba(0, 101, 128, 0.2);
    transform: translateY(-12px);
}

.advantage-item:hover::before {
    transform: scaleX(1);
}

.advantage-icon {
    width: 100px;
    height: 100px;
    margin: 0 auto calc(var(--spacing-unit) * 4);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary-light);
    color: var(--color-primary);
    border-radius: 50%;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    z-index: 1;
    box-shadow: 0 4px 12px rgba(0, 101, 128, 0.15);
}

.advantage-icon::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80%;
    height: 80%;
    background: rgba(255,255,255,0.3);
    border-radius: 50%;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.advantage-item:hover .advantage-icon {
    background: var(--color-primary);
    color: var(--color-white);
    transform: scale(1.15) rotate(5deg);
    box-shadow: 0 8px 24px rgba(0, 101, 128, 0.3);
}

.advantage-item:hover .advantage-icon::before {
    opacity: 1;
}

.advantage-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-black);
    margin-bottom: calc(var(--spacing-unit) * 3);
    transition: color 0.3s ease;
}

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

.advantage-desc {
    font-size: 15px;
    line-height: 1.7;
    color: var(--color-gray-700);
    transition: color 0.3s ease;
}

.advantage-item:hover .advantage-desc {
    color: var(--color-gray-800);
}

/* 侧边客服栏 */
.sidebar-contact {
    position: fixed;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    z-index: 999;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.contact-item {
    position: relative;
    display: flex;
    align-items: center;
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-right: none;
    border-radius: 12px 0 0 12px;
    box-shadow: -2px 2px 8px rgba(0,0,0,0.08);
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
}

.contact-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary);
    color: white;
    flex-shrink: 0;
    transition: all 0.3s;
}

.contact-item:hover .contact-icon {
    background: var(--color-primary-dark);
}

.contact-text {
    padding: 0;
    width: 0;
    opacity: 0;
    white-space: nowrap;
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-size: 14px;
    font-weight: 500;
    color: var(--color-gray-900);
}

.contact-item:hover .contact-text {
    padding: 0 16px 0 12px;
    width: 140px;
    opacity: 1;
}

/* 回到顶部按钮 */
.back-to-top {
    position: relative;
    display: flex;
    align-items: center;
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-right: none;
    border-radius: 12px 0 0 12px;
    box-shadow: -2px 2px 8px rgba(0,0,0,0.08);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    opacity: 0;
    pointer-events: none;
}

.back-to-top.visible {
    opacity: 1;
    pointer-events: auto;
}

.back-to-top .contact-icon {
    background: var(--color-accent);
}

.back-to-top:hover .contact-icon {
    background: var(--color-primary);
}

@media (max-width: 768px) {
    .sidebar-contact {
        display: none;
    }
}

/* 响应式 */
@media (max-width: 768px) {
    .container {
        padding: 0 calc(var(--spacing-unit) * 2);
    }

    body {
        font-size: 14px;
        overflow-x: hidden;
    }
    
    /* 导航栏 */
    nav {
        height: auto;
        min-height: 64px;
        position: sticky;
        top: 0;
    }
    
    nav .container {
        flex-wrap: wrap;
        gap: 10px;
        padding-top: 10px;
        padding-bottom: 10px;
    }

    .logo {
        font-size: 14px;
        max-width: 60%;
    }
    
    .nav-links {
        display: none;
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--color-white);
        flex-direction: column;
        gap: 0;
        border-bottom: 1px solid var(--color-gray-200);
        padding: calc(var(--spacing-unit) * 2) 0;
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .nav-link {
        padding: calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 3);
        border-bottom: 1px solid var(--color-gray-100);
    }
    
    .nav-link:last-child {
        border-bottom: none;
    }
    
    .mobile-menu-btn {
        display: flex;
        flex-direction: column;
        gap: 5px;
        background: none;
        border: none;
        cursor: pointer;
        padding: 8px;
    }
    
    .mobile-menu-btn span {
        width: 24px;
        height: 2px;
        background: var(--color-black);
        transition: all 0.2s;
    }
    
    .mobile-menu-btn.active span:nth-child(1) {
        transform: rotate(45deg) translate(7px, 7px);
    }
    
    .mobile-menu-btn.active span:nth-child(2) {
        opacity: 0;
    }
    
    .mobile-menu-btn.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -7px);
    }
    
    .btn {
        font-size: 13px;
        padding: calc(var(--spacing-unit) * 1.25) calc(var(--spacing-unit) * 2.5);
        width: 100%;
        text-align: center;
    }
    
    /* Hero */
    .hero {
        padding: calc(var(--spacing-unit) * 3) 0 calc(var(--spacing-unit) * 2) 0;
    }
    
    .hero-grid,
    .cases-grid,
    .tech-grid,
    .form-grid,
    .footer-grid {
        grid-template-columns: 1fr;
        gap: calc(var(--spacing-unit) * 4);
    }
    
    .hero h1 {
        font-size: 28px;
        line-height: 1.15;
    }
    
    .hero p {
        font-size: 15px;
    }
    
    .stats {
        grid-template-columns: 1fr;
        gap: calc(var(--spacing-unit) * 2);
        margin-top: calc(var(--spacing-unit) * 3);
    }
    
    .hero-slider {
        height: 240px;
        min-height: 240px;
        border-radius: 14px;
    }
    
    /* Section */
    .section {
        padding: calc(var(--spacing-unit) * 4) 0;
    }

    .section-header {
        margin-bottom: calc(var(--spacing-unit) * 3);
    }
    
    .section-heading {
        font-size: 24px;
    }
    
    /* 选项卡 */
    .tabs {
        gap: calc(var(--spacing-unit) * 2);
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
        padding-bottom: calc(var(--spacing-unit) * 1);
    }
    
    .tabs::-webkit-scrollbar {
        display: none;
    }
    
    .tab {
        white-space: nowrap;
        font-size: 13px;
        padding: calc(var(--spacing-unit) * 1.5) calc(var(--spacing-unit) * 2);
    }
    
    /* 案例卡片 */
    .case-image {
        height: 180px;
    }
    
    .case-content {
        padding: calc(var(--spacing-unit) * 2.5);
    }
    
    .case-title {
        font-size: 16px;
    }
    
    .case-desc {
        font-size: 13px;
    }
    
    /* 客户logo */
    .clients-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: calc(var(--spacing-unit) * 2);
    }
    
    .client-logo {
        height: 56px;
        font-size: 11px;
    }
    
    /* 流程 */
    .process-timeline {
        grid-template-columns: 1fr;
        gap: calc(var(--spacing-unit) * 4);
    }
    
    .process-timeline::before {
        display: none;
    }
    
    /* 工艺 */
    .tech-item {
        padding: calc(var(--spacing-unit) * 3);
    }
    
    .tech-title {
        font-size: 18px;
    }
    
    /* 双轨制业务 */
    .dual-business-grid {
        grid-template-columns: 1fr;
        gap: calc(var(--spacing-unit) * 4);
    }
    
    .business-card {
        padding: calc(var(--spacing-unit) * 3);
    }
    
    .business-icon {
        width: 80px;
        height: 80px;
    }
    
    .business-title {
        font-size: 20px;
    }
    
    .business-desc {
        font-size: 15px;
    }
    
    /* 服务类型 */
    .services-grid {
        grid-template-columns: 1fr;
        gap: calc(var(--spacing-unit) * 3);
    }
    
    .service-item {
        padding: calc(var(--spacing-unit) * 2.5);
    }
    
    .service-icon {
        width: 64px;
        height: 64px;
    }
    
    .service-title {
        font-size: 16px;
    }
    
    .service-desc {
        font-size: 13px;
    }
    
    /* 优势部分 */
    .advantages-grid {
        grid-template-columns: 1fr;
        gap: calc(var(--spacing-unit) * 3);
    }
    
    .advantage-item {
        padding: calc(var(--spacing-unit) * 2.5);
    }
    
    .advantage-icon {
        width: 64px;
        height: 64px;
    }
    
    .advantage-title {
        font-size: 16px;
    }
    
    .advantage-desc {
        font-size: 13px;
    }
    
    /* 业务亮点 */
    .business-highlights {
        grid-template-columns: 1fr;
        gap: calc(var(--spacing-unit) * 2);
    }
    
    .highlight-value {
        font-size: 20px;
    }
    
    .highlight-label {
        font-size: 11px;
    }
    
    /* 表单 */
    input, select, textarea {
        font-size: 16px;
        padding: calc(var(--spacing-unit) * 1.5);
    }
    
    /* Footer */
    .footer-grid {
        gap: calc(var(--spacing-unit) * 4);
    }
}

.printing-detail-section {
    padding: calc(var(--spacing-unit) * 8) 0;
    background: linear-gradient(135deg, var(--color-gray-50) 0%, var(--color-white) 100%);
    border-bottom: 1px solid var(--color-gray-200);
}

.printing-intro {
    max-width: 980px;
    margin: 20px auto 0;
    font-size: 16px;
    line-height: 1.9;
    color: var(--color-gray-700);
}

.printing-process-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: calc(var(--spacing-unit) * 4);
    margin-top: calc(var(--spacing-unit) * 6);
}

.printing-process-card,
.material-card {
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: 18px;
    padding: calc(var(--spacing-unit) * 4);
    box-shadow: 0 8px 24px rgba(0,0,0,0.06);
}

.printing-process-card h3,
.material-card h4 {
    font-size: 22px;
    color: var(--color-black);
    margin-bottom: 14px;
}

.printing-process-card p,
.material-card p {
    font-size: 15px;
    line-height: 1.8;
    color: var(--color-gray-700);
}

.printing-process-card ul {
    margin-top: 16px;
    padding-left: 18px;
}

.printing-process-card li {
    margin-bottom: 10px;
    color: var(--color-gray-700);
    line-height: 1.7;
}

.printing-process-tag {
    display: inline-block;
    padding: 6px 12px;
    margin-bottom: 14px;
    border-radius: 999px;
    background: var(--color-primary-light);
    color: var(--color-primary);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.06em;
}

.printing-materials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: calc(var(--spacing-unit) * 3);
    margin-top: calc(var(--spacing-unit) * 5);
}

@media (max-width: 768px) {
    .printing-detail-section {
        padding: calc(var(--spacing-unit) * 4) 0;
    }

    .printing-intro {
        font-size: 14px;
        line-height: 1.8;
        margin-top: 14px;
    }

    .printing-process-grid,
    .printing-materials-grid {
        grid-template-columns: 1fr;
        gap: calc(var(--spacing-unit) * 3);
    }

    .printing-process-card,
    .material-card {
        padding: calc(var(--spacing-unit) * 3);
        border-radius: 14px;
    }

    .printing-process-card h3,
    .material-card h4 {
        font-size: 18px;
        margin-bottom: 10px;
    }
}


.local-model-section {
    padding: calc(var(--spacing-unit) * 8) 0;
    background: linear-gradient(135deg, var(--color-white) 0%, var(--color-gray-50) 100%);
    border-bottom: 1px solid var(--color-gray-200);
}

.local-model-intro {
    max-width: 920px;
    margin: 18px auto 0;
    font-size: 16px;
    line-height: 1.9;
    color: var(--color-gray-700);
}

.local-model-grid,
.faq-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: calc(var(--spacing-unit) * 3);
    margin-top: calc(var(--spacing-unit) * 5);
}

.local-model-card,
.faq-item {
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: 16px;
    padding: calc(var(--spacing-unit) * 4);
    box-shadow: 0 8px 24px rgba(0,0,0,0.05);
}

.local-model-card h3,
.faq-item h4 {
    font-size: 20px;
    color: var(--color-black);
    margin-bottom: 12px;
}

.local-model-card p,
.faq-item p {
    font-size: 15px;
    line-height: 1.8;
    color: var(--color-gray-700);
}

@media (max-width: 768px) {
    .local-model-section {
        padding: calc(var(--spacing-unit) * 4) 0;
    }

    .local-model-intro {
        font-size: 14px;
        line-height: 1.8;
    }

    .local-model-grid,
    .faq-grid {
        grid-template-columns: 1fr;
        gap: calc(var(--spacing-unit) * 2.5);
    }

    .local-model-card,
    .faq-item {
        padding: calc(var(--spacing-unit) * 3);
    }

    .local-model-card h3,
    .faq-item h4 {
        font-size: 17px;
    }
}

.painting-section {
  padding: calc(var(--spacing-unit) * 8) 0;
  background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-white) 100%);
  border-bottom: 1px solid var(--color-gray-200);
}

.painting-intro {
  max-width: 980px;
  margin: 18px auto 0;
  font-size: 16px;
  line-height: 1.9;
  color: var(--color-gray-700);
}

.painting-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: calc(var(--spacing-unit) * 3);
  margin-top: calc(var(--spacing-unit) * 5);
}

.painting-card,
.painting-point {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: 18px;
  padding: calc(var(--spacing-unit) * 4);
  box-shadow: 0 8px 24px rgba(0,0,0,0.06);
}

.painting-card h3,
.painting-point h4 {
  font-size: 22px;
  margin-bottom: 12px;
  color: var(--color-black);
}

.painting-card p,
.painting-point p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-gray-700);
}

.painting-points-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: calc(var(--spacing-unit) * 3);
  margin-top: calc(var(--spacing-unit) * 4);
}

@media (max-width: 768px) {
  .painting-section {
    padding: calc(var(--spacing-unit) * 4) 0;
  }
  .painting-intro {
    font-size: 14px;
    line-height: 1.8;
  }
  .painting-grid,
  .painting-points-grid {
    grid-template-columns: 1fr;
  }
  .painting-card,
  .painting-point {
    padding: calc(var(--spacing-unit) * 3);
    border-radius: 14px;
  }
  .painting-card h3,
  .painting-point h4 {
    font-size: 18px;
  }
}