/* ========================================
   山东分子科技有限公司 - 全局样式
   主色调：蓝色（来自LOGO）+ 绿色辅色
   ======================================== */

:root {
    /* 主色调 - 来自LOGO蓝色 */
    --primary-blue: #00A0E9;
    --primary-blue-dark: #0085C0;
    --primary-blue-light: #E6F4FA;
    --primary-blue-lighter: #F0F9FE;

    /* 辅色 - LOGO绿色 */
    --accent-green: #A4CD39;
    --accent-green-light: #E8F5D0;

    /* 中性色 */
    --text-dark: #1A1F2E;
    --text-medium: #4B5563;
    --text-gray: #6B7280;
    --text-light: #9CA3AF;
    --bg-light: #F8FAFC;
    --bg-white: #FFFFFF;
    --border-color: #E5E7EB;

    /* 阴影 */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.10);
    --shadow-blue: 0 8px 24px rgba(0, 160, 233, 0.25);

    /* 间距 */
    --container-width: 1240px;
    --section-padding: 100px;

    /* 圆角 */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
}

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

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
                 "Microsoft YaHei", "Hiragino Sans GB", Arial, sans-serif;
    color: var(--text-dark);
    line-height: 1.7;
    background: var(--bg-white);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: inherit;
    text-decoration: none;
    transition: all 0.3s ease;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

/* ===== Container ===== */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== Logo Brand ===== */
.brand-logo {
    display: flex;
    align-items: center;
    line-height: 1;
}

.brand-logo img {
    display: block;
    height: 32px;
    width: auto;
}

/* ===== Navigation ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 1000;
    border-bottom: 1px solid transparent;
    transition: all 0.3s ease;
}

.navbar.scrolled {
    border-bottom-color: var(--border-color);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 76px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 8px;
}

.nav-links a {
    display: inline-block;
    padding: 10px 18px;
    font-size: 17px;
    font-weight: 600;
    color: var(--text-medium);
    border-radius: var(--radius-sm);
    transition: all 0.3s ease;
    position: relative;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary-blue);
}

.nav-links a.active::after {
    content: '';
    position: absolute;
    left: 50%;
    bottom: -28px;
    transform: translateX(-50%);
    width: 24px;
    height: 2px;
    background: var(--primary-blue);
    border-radius: 2px;
}

.nav-cta {
    padding: 10px 22px;
    background: var(--primary-blue);
    color: white;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 600;
    transition: all 0.3s ease;
}

/* ===== 导航下拉菜单 ===== */
.nav-links li.has-dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    background: white;
    min-width: 210px;
    list-style: none;
    padding: 8px 0;
    margin: 0;
    border-radius: var(--radius-md);
    box-shadow: 0 12px 40px rgba(26, 31, 46, 0.14);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s;
    z-index: 1000;
}

.has-dropdown:hover .dropdown-menu,
.has-dropdown:focus-within .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

/* 下拉菜单顶部小三角 */
.dropdown-menu::before {
    content: '';
    position: absolute;
    top: -5px;
    left: 50%;
    transform: translateX(-50%) rotate(45deg);
    width: 10px;
    height: 10px;
    background: white;
    border-radius: 2px;
}

.dropdown-menu li a {
    display: block;
    padding: 11px 22px;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-medium);
    text-align: center;
    white-space: nowrap;
    border-radius: 0;
}

.dropdown-menu li a:hover {
    background: var(--primary-blue-light);
    color: var(--primary-blue);
}

/* 下拉菜单小箭头 */
.has-dropdown > a::after {
    content: '';
    display: inline-block;
    vertical-align: middle;
    margin-left: 6px;
    width: 0;
    height: 0;
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    border-top: 5px solid currentColor;
    transition: transform 0.25s ease;
}

.has-dropdown:hover > a::after {
    transform: rotate(180deg);
}

a.nav-cta:hover {
    background: var(--primary-blue-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-blue);
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 6px;
}

.mobile-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-dark);
    transition: 0.3s;
    border-radius: 2px;
}

/* ===== Hero Section ===== */
.hero {
    position: relative;
    min-height: 100vh;
    padding: 140px 0 80px;
    background: linear-gradient(135deg, #00A0E9 0%, #0080C9 50%, #006BA8 100%);
    color: white;
    overflow: hidden;
    display: flex;
    align-items: center;
}

.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle at 20% 30%, rgba(255,255,255,0.15) 0%, transparent 40%),
        radial-gradient(circle at 80% 70%, rgba(164, 205, 57, 0.18) 0%, transparent 40%);
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.05) 1px, transparent 1px);
    background-size: 60px 60px;
    pointer-events: none;
    opacity: 0.5;
}

.hero-grid {
    position: relative;
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 60px;
    align-items: center;
    z-index: 2;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: rgba(255,255,255,0.15);
    border: 1px solid rgba(255,255,255,0.3);
    border-radius: 100px;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 24px;
    backdrop-filter: blur(10px);
}

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

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(1.2); }
}

.hero-title {
    font-size: clamp(40px, 5.5vw, 64px);
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 20px;
    letter-spacing: -1px;
}

.hero-title .accent {
    color: var(--accent-green);
}

.hero-tagline {
    font-size: 22px;
    font-weight: 600;
    color: rgba(255,255,255,0.95);
    margin-bottom: 16px;
    letter-spacing: 1px;
}

.hero-en {
    font-size: 16px;
    font-weight: 500;
    color: rgba(255,255,255,0.7);
    letter-spacing: 2px;
    margin-bottom: 28px;
    text-transform: uppercase;
}

.hero-desc {
    font-size: 17px;
    line-height: 1.8;
    color: rgba(255,255,255,0.9);
    max-width: 560px;
    margin-bottom: 40px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 16px 32px;
    font-size: 15px;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 28px rgba(0,0,0,0.2);
}

.btn-secondary {
    background: rgba(255,255,255,0.15);
    color: white;
    border: 1px solid rgba(255,255,255,0.4);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255,255,255,0.25);
    border-color: rgba(255,255,255,0.6);
}

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

.btn-blue:hover {
    background: var(--primary-blue-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-blue);
}

.btn-arrow {
    transition: transform 0.3s ease;
}

.btn:hover .btn-arrow {
    transform: translateX(4px);
}

/* Hero visual */
.hero-visual {
    position: relative;
    height: 480px;
}

.hex-molecule {
    position: absolute;
    width: 100%;
    height: 100%;
}

.hex {
    position: absolute;
    background: rgba(255,255,255,0.12);
    border: 1px solid rgba(255,255,255,0.25);
    border-radius: 30%;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(8px);
}

.hex-1 {
    width: 220px;
    height: 220px;
    top: 30px;
    left: 50%;
    transform: translateX(-50%);
    clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
}

.hex-2 {
    width: 140px;
    height: 140px;
    top: 0;
    right: 60px;
    background: var(--accent-green);
    border-color: rgba(255,255,255,0.3);
    opacity: 0.85;
    clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
}

.hex-3 {
    width: 110px;
    height: 110px;
    bottom: 60px;
    left: 30px;
    clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
}

.hex-4 {
    width: 90px;
    height: 90px;
    bottom: 110px;
    right: 20px;
    background: rgba(164, 205, 57, 0.65);
    clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
}

.hex-5 {
    width: 70px;
    height: 70px;
    top: 100px;
    left: 50px;
    background: rgba(255,255,255,0.25);
    clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
}

.hero-stats {
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(255,255,255,0.1);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255,255,255,0.25);
    border-radius: var(--radius-lg);
    padding: 22px 44px;
    display: flex;
    align-items: center;
    gap: 32px;
    z-index: 3;
}

.hero-stat {
    text-align: center;
    min-width: 92px;
}

.hero-stat-num {
    font-size: 32px;
    font-weight: 700;
    color: white;
    line-height: 1;
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 2px;
}

.hero-stat-num .plus {
    font-size: 20px;
    font-weight: 600;
    color: var(--accent-green);
    margin-left: 1px;
}

.hero-stat-num .plus-sm {
    font-size: 15px;
}

.hero-stat-label {
    font-size: 13px;
    color: rgba(255,255,255,0.85);
    margin-top: 8px;
    letter-spacing: 1px;
    white-space: nowrap;
}

.hero-divider {
    width: 1px;
    height: 36px;
    background: rgba(255,255,255,0.3);
}

@keyframes float {
    0%, 100% { transform: translateY(0) translateX(-50%); }
    50% { transform: translateY(-12px) translateX(-50%); }
}

/* ===== Section common ===== */
section {
    padding: var(--section-padding) 0;
}

.section-header {
    text-align: center;
    max-width: 720px;
    margin: 0 auto 70px;
}

.section-tag {
    display: inline-block;
    padding: 6px 16px;
    background: var(--primary-blue-light);
    color: var(--primary-blue);
    border-radius: 100px;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 1px;
    margin-bottom: 16px;
}

.section-title {
    font-size: clamp(28px, 3.5vw, 42px);
    font-weight: 800;
    color: var(--text-dark);
    line-height: 1.25;
    margin-bottom: 18px;
    letter-spacing: -0.5px;
}

.section-title .highlight {
    color: var(--primary-blue);
}

.section-desc {
    font-size: 17px;
    color: var(--text-gray);
    line-height: 1.8;
}

/* ===== Service Overview Section ===== */
.services {
    background: var(--bg-light);
}

.service-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.service-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: 34px 18px 30px;
    border: 1px solid var(--border-color);
    transition: all 0.4s ease;
    position: relative;
    overflow: hidden;
    text-align: center;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--primary-blue);
    transform: scaleY(0);
    transform-origin: top;
    transition: transform 0.4s ease;
}

.service-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.service-card:hover::before {
    transform: scaleY(1);
}

.service-icon {
    width: 64px;
    height: 64px;
    background: var(--primary-blue-light);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 18px;
    transition: all 0.3s ease;
}

.service-card:hover .service-icon {
    background: var(--primary-blue);
    transform: scale(1.05);
}

.service-icon svg {
    width: 32px;
    height: 32px;
    fill: var(--primary-blue);
    transition: fill 0.3s ease;
}

.service-card:hover .service-icon svg {
    fill: white;
}

.service-card h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 18px;
    color: var(--text-dark);
}

.service-card p {
    color: var(--text-gray);
    font-size: 15px;
    line-height: 1.7;
    margin-bottom: 18px;
}

.service-link {
    color: var(--primary-blue);
    font-weight: 600;
    font-size: 14px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: gap 0.3s ease;
}

.service-card:hover .service-link {
    gap: 10px;
}

/* ===== Advantages Section ===== */
.advantages {
    background: white;
}

.advantage-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.advantage-card {
    text-align: center;
    padding: 40px 28px;
    border-radius: var(--radius-lg);
    background: var(--bg-light);
    transition: all 0.3s ease;
}

.advantage-card:hover {
    background: white;
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.advantage-num {
    font-size: 56px;
    font-weight: 800;
    color: var(--primary-blue);
    line-height: 1;
    margin-bottom: 12px;
    background: linear-gradient(135deg, var(--primary-blue), var(--accent-green));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.advantage-card h4 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-dark);
}

.advantage-card p {
    color: var(--text-gray);
    font-size: 14px;
    line-height: 1.7;
}

/* ===== Process Section ===== */
.process {
    background: linear-gradient(135deg, #F0F9FE 0%, #E6F4FA 100%);
}

.process-steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    position: relative;
}

.process-steps::before {
    content: '';
    position: absolute;
    top: 40px;
    left: 12.5%;
    right: 12.5%;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-blue), var(--accent-green));
    z-index: 0;
}

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

.process-num {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    background: white;
    border: 3px solid var(--primary-blue);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 26px;
    font-weight: 800;
    color: var(--primary-blue);
    position: relative;
    transition: all 0.3s ease;
}

.process-step:hover .process-num {
    background: var(--primary-blue);
    color: white;
    transform: scale(1.05);
}

.process-step h4 {
    font-size: 17px;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-dark);
}

.process-step p {
    color: var(--text-gray);
    font-size: 14px;
    line-height: 1.6;
    max-width: 220px;
    margin: 0 auto;
}

/* ===== Partners Section ===== */
.partners {
    background: white;
}

.partners-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 20px;
}

.partner-cell {
    background: var(--bg-light);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 28px 16px;
    text-align: center;
    font-weight: 600;
    color: var(--text-medium);
    transition: all 0.3s ease;
    font-size: 14px;
    min-height: 88px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.partner-cell:hover {
    background: var(--primary-blue-light);
    border-color: var(--primary-blue);
    color: var(--primary-blue);
    transform: translateY(-2px);
}

/* ===== About Detail ===== */
.about-intro {
    background: white;
}

.about-intro-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-visual {
    position: relative;
    height: 460px;
    background: linear-gradient(135deg, var(--primary-blue), #0080C9);
    border-radius: var(--radius-xl);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.about-visual::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle at 30% 40%, rgba(255,255,255,0.2) 0%, transparent 50%),
        radial-gradient(circle at 70% 60%, rgba(164, 205, 57, 0.25) 0%, transparent 50%);
}

.about-visual-content {
    position: relative;
    color: white;
    text-align: center;
    padding: 40px;
    z-index: 2;
}

.about-visual-logo {
    font-size: 64px;
    font-weight: 800;
    letter-spacing: -2px;
    line-height: 1;
    margin-bottom: 24px;
}

.about-visual-logo .mol { color: var(--accent-green); }
.about-visual-logo .tek { color: white; }

.about-visual-tagline {
    font-size: 16px;
    color: rgba(255,255,255,0.9);
    letter-spacing: 2px;
    margin-bottom: 20px;
}

.about-visual-quote {
    font-size: 22px;
    font-weight: 600;
    line-height: 1.6;
    color: white;
    max-width: 320px;
    margin: 0 auto;
    position: relative;
}

.about-visual-quote::before,
.about-visual-quote::after {
    content: '"';
    font-size: 48px;
    color: var(--accent-green);
    position: absolute;
    opacity: 0.6;
}

.about-visual-quote::before {
    top: -20px;
    left: -30px;
}

.about-visual-quote::after {
    bottom: -40px;
    right: -30px;
}

.about-text h2 {
    font-size: 36px;
    font-weight: 800;
    color: var(--text-dark);
    margin-bottom: 20px;
    letter-spacing: -0.5px;
}

.about-text .highlight {
    color: var(--primary-blue);
}

.about-text p {
    color: var(--text-medium);
    font-size: 16px;
    line-height: 1.85;
    margin-bottom: 16px;
}

/* ===== Culture Section ===== */
.culture {
    background: var(--bg-light);
}

.culture-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.culture-card {
    background: white;
    padding: 40px 30px;
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.culture-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-blue);
}

.culture-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto 22px;
    background: linear-gradient(135deg, var(--primary-blue), var(--accent-green));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.culture-icon svg {
    width: 36px;
    height: 36px;
    fill: white;
}

.culture-card h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 14px;
}

.culture-card p {
    color: var(--text-gray);
    font-size: 15px;
    line-height: 1.8;
}

.culture-card .accent-line {
    width: 40px;
    height: 3px;
    background: var(--primary-blue);
    margin: 0 auto 18px;
    border-radius: 2px;
}

/* ===== Timeline ===== */
.timeline {
    background: white;
}

.timeline-list {
    max-width: 880px;
    margin: 0 auto;
    position: relative;
}

.timeline-list::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--primary-blue-light);
    transform: translateX(-50%);
}

.timeline-item {
    display: grid;
    grid-template-columns: 1fr 60px 1fr;
    gap: 0;
    margin-bottom: 40px;
    align-items: center;
}

.timeline-content {
    background: var(--bg-light);
    padding: 26px 28px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.timeline-content:hover {
    background: white;
    box-shadow: var(--shadow-md);
    border-color: var(--primary-blue);
}

.timeline-item:nth-child(odd) .timeline-content {
    grid-column: 1;
    text-align: right;
    margin-right: 0;
}

.timeline-item:nth-child(even) .timeline-content {
    grid-column: 3;
    text-align: left;
}

.timeline-dot {
    grid-column: 2;
    width: 18px;
    height: 18px;
    background: var(--primary-blue);
    border: 4px solid white;
    border-radius: 50%;
    margin: 0 auto;
    box-shadow: 0 0 0 2px var(--primary-blue);
}

.timeline-year {
    color: var(--primary-blue);
    font-weight: 700;
    font-size: 14px;
    margin-bottom: 6px;
}

.timeline-content h4 {
    font-size: 17px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.timeline-content p {
    font-size: 14px;
    color: var(--text-gray);
    line-height: 1.6;
}

/* ===== Services Detail ===== */
.service-detail {
    padding: 80px 0;
    border-bottom: 1px solid var(--border-color);
}

.service-detail:nth-child(even) {
    background: var(--bg-light);
}

.service-detail-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.service-detail:nth-child(even) .service-detail-grid {
    direction: rtl;
}

.service-detail:nth-child(even) .service-detail-content {
    direction: ltr;
}

.service-detail-visual {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    background: var(--bg-light);
}

.service-detail-visual img {
    display: block;
    width: 100%;
    height: 360px;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.service-detail:hover .service-detail-visual img {
    transform: scale(1.04);
}

/* 标签云（替代原详细列表，更轻量） */
.service-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 8px;
}

.service-tags span {
    display: inline-block;
    padding: 8px 16px;
    background: var(--primary-blue-lighter);
    color: var(--primary-blue);
    font-size: 14px;
    font-weight: 500;
    border-radius: 100px;
    transition: all 0.25s ease;
}

.service-tags span:hover {
    background: var(--primary-blue);
    color: white;
    transform: translateY(-1px);
}

/* 三行布局（用于 实验室综合解决方案） */
.service-tags-col {
    display: flex;
    flex-direction: column;
    gap: 12px;
    align-items: flex-start;
}

.service-tags-col .service-tag-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.service-detail-content .service-tag {
    display: inline-block;
    padding: 5px 14px;
    background: var(--primary-blue-light);
    color: var(--primary-blue);
    border-radius: 100px;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 14px;
}

.service-detail-content h2 {
    font-size: 32px;
    font-weight: 800;
    color: var(--text-dark);
    line-height: 1.3;
    margin-bottom: 18px;
    letter-spacing: -0.5px;
}

.service-detail-content > p {
    color: var(--text-medium);
    font-size: 16px;
    line-height: 1.85;
    margin-bottom: 24px;
}

.service-detail-list {
    list-style: none;
    margin-bottom: 24px;
}

.service-detail-list li {
    padding: 10px 0 10px 32px;
    color: var(--text-medium);
    font-size: 15px;
    line-height: 1.7;
    position: relative;
    border-bottom: 1px dashed var(--border-color);
}

.service-detail-list li:last-child {
    border-bottom: none;
}

.service-detail-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 18px;
    width: 18px;
    height: 18px;
    background: var(--primary-blue-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.service-detail-list li::after {
    content: '';
    position: absolute;
    left: 5px;
    top: 22px;
    width: 8px;
    height: 8px;
    background: var(--primary-blue);
    border-radius: 50%;
}

/* ===== Contact Page ===== */
.contact-section {
    background: white;
    padding: 80px 0 var(--section-padding);
}

.contact-grid {
    display: grid;
    grid-template-columns: minmax(0, 460px) minmax(0, 1fr);
    align-items: stretch;
    gap: 40px;
}

/* 地图卡片（联系页右栏） */
.contact-map-card {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    display: flex;
    min-height: 460px;
    position: relative;
}

.contact-map-card #map-container {
    flex: 1;
    height: auto;
    min-height: 460px;
}

.contact-info-card {
    background: linear-gradient(135deg, var(--primary-blue), #0080C9);
    border-radius: var(--radius-lg);
    padding: 50px 40px;
    color: white;
    position: relative;
    overflow: hidden;
}

.contact-info-card::before {
    content: '';
    position: absolute;
    bottom: -80px;
    right: -80px;
    width: 280px;
    height: 280px;
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 50%;
}

.contact-info-card::after {
    content: '';
    position: absolute;
    bottom: -40px;
    right: -40px;
    width: 200px;
    height: 200px;
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 50%;
}

.contact-info-card h3 {
    font-size: 26px;
    font-weight: 700;
    margin-bottom: 14px;
    position: relative;
}

.contact-info-card > p {
    font-size: 15px;
    color: rgba(255,255,255,0.9);
    margin-bottom: 36px;
    line-height: 1.7;
    position: relative;
}

.contact-info-list {
    list-style: none;
    position: relative;
}

.contact-info-list li {
    display: flex;
    gap: 18px;
    margin-bottom: 28px;
    align-items: flex-start;
}

.contact-info-icon {
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    background: rgba(255,255,255,0.15);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.contact-info-icon svg {
    width: 20px;
    height: 20px;
    fill: white;
}

.contact-info-list h4 {
    font-size: 14px;
    font-weight: 600;
    color: rgba(255,255,255,0.7);
    margin-bottom: 6px;
    letter-spacing: 0.5px;
}

.contact-info-list p {
    font-size: 16px;
    color: white;
    line-height: 1.6;
}

.contact-info-list a:hover {
    opacity: 0.85;
}

/* Contact Form */
.contact-form-wrap {
    background: white;
    border-radius: var(--radius-lg);
    padding: 50px;
    border: 1px solid var(--border-color);
}

.contact-form-wrap h3 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.contact-form-wrap > p {
    color: var(--text-gray);
    margin-bottom: 30px;
    font-size: 15px;
}

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

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.form-group label .required {
    color: #EF4444;
    margin-left: 4px;
}

.form-control {
    width: 100%;
    padding: 13px 16px;
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 15px;
    color: var(--text-dark);
    transition: border-color 0.3s, box-shadow 0.3s;
    background: white;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(0, 160, 233, 0.1);
}

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

.form-submit {
    width: 100%;
    padding: 16px;
    background: var(--primary-blue);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.form-submit:hover {
    background: var(--primary-blue-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-blue);
}

/* Map（联系页右栏卡片内） */
#map-container {
    width: 100%;
    height: 450px;
    background: #e8eaed;
    position: relative;
}

#map-container .map-loading {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--text-gray);
    font-size: 14px;
    z-index: 1;
}

/* ===== CTA Section ===== */
.cta-section {
    background: linear-gradient(135deg, var(--primary-blue) 0%, #0080C9 100%);
    color: white;
    padding: 80px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: -100px;
    right: -100px;
    width: 400px;
    height: 400px;
    background: rgba(164, 205, 57, 0.15);
    border-radius: 50%;
}

.cta-section::after {
    content: '';
    position: absolute;
    bottom: -100px;
    left: -100px;
    width: 400px;
    height: 400px;
    background: rgba(255,255,255,0.08);
    border-radius: 50%;
}

.cta-content {
    position: relative;
    z-index: 2;
}

.cta-content h2 {
    font-size: clamp(28px, 3.5vw, 40px);
    font-weight: 800;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.cta-content p {
    font-size: 18px;
    color: rgba(255,255,255,0.9);
    max-width: 600px;
    margin: 0 auto 32px;
    line-height: 1.7;
}

.cta-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ===== Footer ===== */
.footer {
    background: #EDF2F8;
    color: var(--text-medium);
    padding: 70px 0 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr 1.2fr 1fr;
    gap: 40px;
    margin-bottom: 50px;
}

/* 关注我们 二维码 - 居中布局 */
.footer-qr {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    text-align: center;
    padding-left: 28px;
}

.footer-qr h5 {
    color: var(--text-dark);
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 16px;
    position: relative;
    padding: 0;
}

.footer-qr h5::before {
    display: none;
}

.footer-qr h5::after {
    display: none;
}

.footer-qr img {
    width: 100px;
    height: 100px;
    display: block;
    padding: 5px;
    background: white;
    border: 1px solid rgba(0, 0, 0, 0.08);
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(26, 31, 46, 0.06);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.footer-qr img:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 160, 233, 0.18);
}

.footer-qr p {
    margin-top: 12px;
    font-size: 12px;
    color: var(--text-medium);
    line-height: 1.5;
}

/* 品牌区 - 紧凑缩小 */
.footer-brand .brand-logo {
    margin-bottom: 12px;
}

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

.footer-brand p {
    font-size: 13px;
    line-height: 1.75;
    margin-bottom: 0;
    max-width: 290px;
}

.footer h5 {
    color: var(--text-dark);
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 22px;
    position: relative;
    padding-bottom: 12px;
}

.footer h5::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 24px;
    height: 2px;
    background: var(--primary-blue);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    font-size: 14px;
    color: var(--text-medium);
    transition: color 0.3s, padding-left 0.3s;
    display: inline-block;
}

.footer-links a:hover {
    color: var(--primary-blue);
    padding-left: 6px;
}

.footer-contact-item {
    display: flex;
    gap: 12px;
    margin-bottom: 16px;
    align-items: flex-start;
}

.footer-contact-item svg {
    width: 16px;
    height: 16px;
    fill: var(--primary-blue);
    flex-shrink: 0;
    margin-top: 5px;
}

.footer-contact-item span {
    font-size: 14px;
    line-height: 1.6;
}

.footer-bottom {
    padding-top: 30px;
    border-top: 1px solid rgba(0,0,0,0.08);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-bottom p {
    font-size: 13px;
    color: #6B7785;
}

.footer-bottom-links {
    display: flex;
    gap: 20px;
    list-style: none;
}

.footer-bottom-links a {
    font-size: 13px;
    color: #6B7785;
}

.footer-bottom-links a:hover {
    color: var(--primary-blue);
}

/* ===== Back to Top ===== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    background: var(--primary-blue);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-blue);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 999;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-4px);
    background: var(--primary-blue-dark);
}

.back-to-top svg {
    width: 20px;
    height: 20px;
    fill: white;
}

/* ===== Animations ===== */
@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.fade-up {
    animation: fadeUp 0.8s ease-out;
}

/* ===== Responsive ===== */
@media (max-width: 992px) {
    :root {
        --section-padding: 70px;
    }

    .hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .hero-visual {
        display: none;
    }

    .service-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .hero-stats {
        position: static;
        transform: none;
        margin: 30px auto 0;
        display: inline-flex;
    }

    .hero {
        padding: 120px 0 60px;
        text-align: center;
    }

    .hero-buttons {
        justify-content: center;
    }

    .hero-desc {
        margin: 0 auto 30px;
    }

    .advantage-grid,
    .culture-grid {
        grid-template-columns: 1fr;
    }

    .process-steps {
        grid-template-columns: repeat(2, 1fr);
        gap: 40px 20px;
    }

    .process-steps::before {
        display: none;
    }

    .partners-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .about-intro-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

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

    .service-detail:nth-child(even) .service-detail-grid {
        direction: ltr;
    }

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

    .footer-grid {
        grid-template-columns: 1fr 1fr 1fr;
        gap: 36px;
    }

    .footer-qr {
        grid-column: 1 / -1;
        padding-left: 0;
    }

    .footer-qr img {
        margin: 0 auto;
    }

    .timeline-item {
        grid-template-columns: 40px 1fr;
    }

    .timeline-list::before {
        left: 19px;
    }

    .timeline-item .timeline-content {
        grid-column: 2 !important;
        text-align: left !important;
    }

    .timeline-dot {
        grid-column: 1;
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding: 60px;
    }

    .nav-links {
        display: none;
    }

    /* 移动端下拉菜单：菜单展开时直接显示在菜单项下方 */
    .dropdown-menu {
        position: static;
        transform: none;
        opacity: 1;
        visibility: visible;
        display: none;
        min-width: 0;
        box-shadow: none;
        background: var(--primary-blue-lighter);
        border-radius: var(--radius-sm);
        padding: 4px 0;
        margin: 4px 0 8px;
    }

    .dropdown-menu::before {
        display: none;
    }

    .nav-links.open .has-dropdown.expanded .dropdown-menu,
    .nav-links.open .has-dropdown.expanded:hover .dropdown-menu,
    .nav-links.open .has-dropdown.expanded:focus-within .dropdown-menu {
        display: block;
    }

    .dropdown-menu li a {
        padding: 10px 0;
        font-size: 15px;
    }

    .has-dropdown > a::after {
        display: none;
    }

    .mobile-toggle {
        display: flex;
    }

    .nav-cta {
        display: none;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: stretch;
    }

    .btn {
        padding: 14px 20px;
        font-size: 14px;
    }

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

    .partners-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .form-row {
        grid-template-columns: 1fr;
        gap: 0;
    }

    .contact-form-wrap {
        padding: 30px 24px;
    }

    .contact-info-card {
        padding: 30px 24px;
    }

    .contact-map-card,
    .contact-map-card #map-container {
        min-height: 320px;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }

    .about-visual {
        height: 360px;
    }

    .about-visual-logo {
        font-size: 48px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .nav-container {
        padding: 0 16px;
    }

    .brand-logo img {
        height: 28px;
    }
}