/* ========================================
   苏州冰禾信息技术有限公司 - 官网样式
   版本: 1.0
   ======================================== */

/* === CSS 变量 === */
:root {
    /* 主色系 - 科技蓝 (统一蓝色阶) */
    --primary: #1B5BF5;
    --primary-dark: #0A3D9E;
    --primary-light: var(--primary-light);

    /* 蓝色阶系统 */
    --blue-50:  var(--blue-50);
    --blue-100: rgba(27, 91, 245, 0.10);
    --blue-200: rgba(27, 91, 245, 0.20);
    --blue-300: rgba(27, 91, 245, 0.30);
    --blue-400: rgba(27, 91, 245, 0.40);
    --blue-500: #1B5BF5;
    --blue-600: #0A3D9E;
    --blue-900: #0B1E2F;
    --blue-950: #070F1A;

    /* 辅助色 */
    --accent: #00D4AA;
    --accent-dark: #00B894;
    --accent-light: #5EEAD4;

    /* 中性色 */
    --dark: #0F172A;
    --dark-2: #1E293B;
    --dark-3: #334155;
    --gray: #64748B;
    --gray-light: #94A3B8;
    --gray-lighter: #CBD5E1;
    --gray-lightest: #E2E8F0;
    --bg-light: #F8FAFC;
    --bg-light-2: #F1F5F9;
    --white: #FFFFFF;

    /* 语义色 */
    --success: #10B981;
    --warning: #F59E0B;
    --danger: #EF4444;
    --info: var(--primary);

    /* 尺寸 */
    --max-width: 1200px;
    --header-height: 72px;
    --footer-height: auto;

    /* 阴影 */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-primary: 0 4px 20px var(--blue-300);

    /* 圆角 */
    --radius-sm: 6px;
    --radius: 10px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --radius-full: 9999px;

    /* 过渡 */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    font-size: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Microsoft YaHei", "Source Han Sans CN", sans-serif;
    color: var(--dark);
    background: var(--white);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition-fast);
}

ul,
ol {
    list-style: none;
}

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

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

input,
textarea {
    font-family: inherit;
    font-size: inherit;
}

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

/* === 按钮 === */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: var(--radius-full);
    font-size: 15px;
    font-weight: 600;
    letter-spacing: 0.3px;
    transition: var(--transition);
    white-space: nowrap;
    cursor: pointer;
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px var(--blue-400);
}

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

.btn-outline:hover {
    background: var(--primary);
    color: var(--white);
    transform: translateY(-2px);
}

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

.btn-white:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-ghost-white {
    border-color: rgba(255, 255, 255, 0.5);
    color: var(--white);
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
}

.btn-ghost-white:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: var(--white);
}

.btn-lg {
    padding: 16px 40px;
    font-size: 17px;
}

/* === 头部导航 === */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--gray-lightest);
    z-index: 1000;
    transition: var(--transition);
}

.header.scrolled {
    box-shadow: var(--shadow);
}

.nav {
    max-width: var(--max-width);
    height: 100%;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}

.logo img {
    height: 40px;
    width: auto;
    display: block;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-link {
    padding: 8px 18px;
    font-size: 15px;
    font-weight: 500;
    color: var(--dark-3);
    border-radius: var(--radius-full);
    transition: var(--transition-fast);
    position: relative;
}

.nav-link:hover {
    color: var(--primary);
    background: var(--bg-light-2);
}

.nav-link.active {
    color: var(--primary);
    background: var(--blue-50);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.nav-actions .btn {
    padding: 9px 22px;
    font-size: 14px;
}

/* 汉堡菜单按钮 */
.hamburger {
    display: none;
    width: 44px;
    height: 44px;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}

.hamburger:hover {
    background: var(--bg-light-2);
}

.hamburger span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--dark);
    border-radius: 2px;
    transition: var(--transition);
}

.hamburger.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* === 移动端菜单面板 === */
.mobile-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--white);
    z-index: 999;
    transform: translateX(100%);
    transition: var(--transition);
    overflow-y: auto;
    padding: 24px;
}

.mobile-menu.open {
    transform: translateX(0);
}

.mobile-menu .nav-link {
    display: block;
    padding: 16px 20px;
    font-size: 18px;
    border-radius: var(--radius);
    margin-bottom: 4px;
    border: 1px solid transparent;
}

.mobile-menu .nav-link:hover,
.mobile-menu .nav-link.active {
    background: var(--blue-50);
    color: var(--primary);
    border-color: var(--gray-lightest);
}

.mobile-menu .nav-actions {
    margin-top: 24px;
    flex-direction: column;
    gap: 12px;
}

.mobile-menu .nav-actions .btn {
    width: 100%;
    padding: 14px;
    font-size: 16px;
}

/* === Hero 区 === */
.hero {
    position: relative;
    min-height: 600px;
    padding: 140px 0 100px;
    background: url("../images/hero-bg-20260728.png") center center / cover no-repeat;
    overflow: hidden;
    display: flex;
    align-items: center;
}

.hero-bg-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(11, 30, 58, 0.82) 0%, rgba(11, 30, 58, 0.78) 40%, rgba(11, 30, 58, 0.72) 100%);
    z-index: 1;
}

.hero::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1440 320'%3E%3Cpath fill='%23ffffff' fill-opacity='0.03' d='M0,160L48,176C96,192,192,224,288,213.3C384,203,480,149,576,149.3C672,149,768,203,864,224C960,245,1056,235,1152,197.3C1248,160,1344,96,1392,64L1440,32L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z'%3E%3C/path%3E%3C/svg%3E");
    background-position: bottom;
    background-repeat: no-repeat;
    background-size: cover;
    pointer-events: none;
    z-index: 2;
}

.hero-bg-grid {
    display: none;
}

.hero-content {
    position: relative;
    z-index: 3;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-full);
    color: var(--white);
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 24px;
}

.hero-badge-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent);
}

.hero h1 {
    font-size: 56px;
    font-weight: 800;
    color: var(--white);
    line-height: 1.2;
    margin-bottom: 24px;
    letter-spacing: -1px;
}

.hero h1 .highlight {
    color: var(--primary-light);
}

.hero p {
    font-size: 20px;
    color: rgba(255, 255, 255, 0.75);
    margin-bottom: 40px;
    line-height: 1.7;
}

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

/* Hero 统计数据 */
.hero-stats {
    position: relative;
    z-index: 3;
    display: flex;
    gap: 48px;
    justify-content: center;
    margin-top: 64px;
    flex-wrap: wrap;
}

.hero-stat {
    text-align: center;
}

.hero-stat-num {
    font-size: 42px;
    font-weight: 800;
    color: var(--white);
    line-height: 1;
}

.hero-stat-label {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
    margin-top: 8px;
}

/* === 页面 Banner (子页面用) === */
.page-banner {
    position: relative;
    padding: 140px 0 80px;
    background: var(--blue-900);
    overflow: hidden;
    text-align: center;
}

.page-banner::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 50%, var(--blue-100) 0%, transparent 60%);
}

.page-banner .container {
    position: relative;
    z-index: 2;
}

.page-banner h1 {
    font-size: 48px;
    font-weight: 800;
    color: var(--white);
    margin-bottom: 16px;
}

.page-banner p {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.7);
    max-width: 600px;
    margin: 0 auto;
}

/* === 通用 Section === */
section {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 56px;
}

.section-tag {
    display: inline-block;
    padding: 6px 16px;
    background: var(--blue-50);
    color: var(--primary);
    font-size: 14px;
    font-weight: 600;
    border-radius: var(--radius-full);
    margin-bottom: 16px;
}

.section-title {
    font-size: 40px;
    font-weight: 800;
    color: var(--dark);
    line-height: 1.3;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.section-subtitle {
    font-size: 17px;
    color: var(--gray);
    line-height: 1.7;
}

/* === 产品卡片 === */
.product-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 40px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 1px solid var(--gray-lightest);
    position: relative;
    overflow: hidden;
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-light);
}

.product-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--transition);
}

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

.product-icon {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 24px;
}

.product-icon.accent {
    background: var(--accent);
}

.product-card h3 {
    font-size: 24px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 8px;
}

.product-card .product-subtitle {
    font-size: 15px;
    color: var(--primary);
    font-weight: 500;
    margin-bottom: 16px;
}

.product-card p {
    color: var(--gray);
    font-size: 15px;
    line-height: 1.8;
    margin-bottom: 20px;
}

.product-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.product-tag {
    padding: 5px 14px;
    background: var(--bg-light-2);
    border-radius: var(--radius-full);
    font-size: 13px;
    color: var(--gray);
    font-weight: 500;
}

/* === 解决方案卡片 === */
.solution-card {
    background: linear-gradient(135deg, #FFFFFF 0%, #F8FAFC 100%);
    border-radius: var(--radius-lg);
    padding: 40px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid var(--gray-lightest);
    height: 100%;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

.solution-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary) 0%, var(--primary-light) 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
}

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

.solution-card:hover::before {
    opacity: 1;
}

.solution-card:hover .solution-icon {
    transform: rotate(5deg) scale(1.08);
}

.solution-icon {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 20px;
    box-shadow: 0 6px 20px rgba(27, 91, 245, 0.3);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

/* 每个卡片的图标不同渐变 */
.solution-card:nth-child(1) .solution-icon {
    background: linear-gradient(135deg, #1B5BF5 0%, #4A90F8 100%);
    box-shadow: 0 6px 20px rgba(27, 91, 245, 0.3);
}

.solution-card:nth-child(2) .solution-icon {
    background: linear-gradient(135deg, #0A3D9E 0%, #1B5BF5 100%);
    box-shadow: 0 6px 20px rgba(10, 61, 158, 0.35);
}

.solution-card:nth-child(3) .solution-icon {
    background: linear-gradient(135deg, #1B5BF5 0%, #6AB2FF 100%);
    box-shadow: 0 6px 20px rgba(27, 91, 245, 0.3);
}

.solution-card:nth-child(4) .solution-icon {
    background: linear-gradient(135deg, #00D4AA 0%, #5EEAD4 100%);
    box-shadow: 0 6px 20px rgba(0, 212, 170, 0.3);
}

/* 第四个卡片顶部装饰线用绿色accent */
.solution-card:nth-child(4)::before {
    background: linear-gradient(90deg, var(--accent) 0%, var(--accent-light) 100%);
}

.solution-card:nth-child(4):hover {
    border-color: var(--accent);
}

.solution-card:nth-child(4) .product-tag {
    color: var(--accent-dark);
}

.solution-card h3 {
    font-size: 22px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 14px;
}

.solution-card p {
    color: var(--gray);
    font-size: 15px;
    line-height: 1.8;
    margin-bottom: 20px;
    flex: 1;
}

.solution-card .product-tag {
    display: inline-block;
    margin-right: 8px;
    margin-bottom: 8px;
    background: var(--bg-light-2);
    color: var(--primary);
    border: 1px solid var(--gray-lightest);
    padding: 6px 14px;
    border-radius: var(--radius-full);
    font-size: 13px;
    font-weight: 500;
    transition: all 0.2s ease;
}

.solution-card .product-tag:hover {
    background: var(--primary);
    color: var(--white);
    border-color: var(--primary);
}

/* === 数据统计区 === */
.stats-section {
    background: var(--blue-900);
    padding: 80px 0;
    position: relative;
    overflow: hidden;
}

.stats-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 20% 50%, var(--blue-100) 0%, transparent 60%);
}

.stats-grid {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    text-align: center;
}

.stat-item {
    padding: 20px;
}

.stat-num {
    font-size: 52px;
    font-weight: 800;
    color: var(--white);
    line-height: 1;
    margin-bottom: 12px;
}

.stat-num .unit {
    font-size: 28px;
    color: var(--accent);
}

.stat-label {
    font-size: 16px;
    color: rgba(255, 255, 255, 0.6);
}

/* === 特性卡片 === */
.feature-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 36px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid var(--gray-lightest);
    height: 100%;
    text-align: center;
}

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

.feature-icon {
    width: 72px;
    height: 72px;
    border-radius: 50%;
    background: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 30px;
    font-weight: 700;
    margin: 0 auto 20px;
    transition: var(--transition);
    box-shadow: 0 4px 12px rgba(27, 91, 245, 0.25);
}

.feature-card:hover .feature-icon {
    transform: scale(1.1);
    box-shadow: 0 8px 24px rgba(27, 91, 245, 0.35);
}

.feature-card h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 12px;
}

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

/* === 案例卡片 === */
.case-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid var(--gray-lightest);
    height: 100%;
    display: flex;
    flex-direction: column;
}

.case-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.case-card-header {
    padding: 28px 32px 0;
}

.case-card-tag {
    display: inline-block;
    padding: 4px 12px;
    background: var(--blue-50);
    color: var(--primary);
    font-size: 13px;
    font-weight: 600;
    border-radius: var(--radius-full);
    margin-bottom: 12px;
}

.case-card h3 {
    font-size: 19px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 16px;
}

.case-card-body {
    padding: 0 32px 32px;
    flex: 1;
}

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

.case-card-footer {
    padding: 20px 32px;
    background: var(--bg-light);
    border-top: 1px solid var(--gray-lightest);
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
}

.case-metric {
    text-align: center;
    flex: 1;
}

.case-metric-num {
    font-size: 24px;
    font-weight: 800;
    color: var(--primary);
    line-height: 1;
}

.case-metric-label {
    font-size: 12px;
    color: var(--gray);
    margin-top: 4px;
}

/* === 时间线 === */
.timeline {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
    padding: 20px 0;
}

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

.timeline-item {
    position: relative;
    width: 50%;
    padding: 0 40px 48px;
}

.timeline-item:nth-child(odd) {
    left: 0;
    text-align: right;
}

.timeline-item:nth-child(even) {
    left: 50%;
}

.timeline-dot {
    position: absolute;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--white);
    border: 3px solid var(--primary);
    top: 6px;
    z-index: 2;
}

.timeline-item:nth-child(odd) .timeline-dot {
    right: -8px;
}

.timeline-item:nth-child(even) .timeline-dot {
    left: -8px;
}

.timeline-year {
    font-size: 24px;
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 8px;
}

.timeline-content {
    background: var(--white);
    padding: 24px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-lightest);
}

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

.timeline-content p {
    font-size: 14px;
    color: var(--gray);
    line-height: 1.7;
}

/* === CTA 区域 === */
.cta-section {
    padding: 80px 0;
    background: var(--blue-900);
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 50%, var(--blue-100) 0%, transparent 60%);
}

.cta-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.cta-content h2 {
    font-size: 36px;
    font-weight: 800;
    color: var(--white);
    margin-bottom: 16px;
}

.cta-content p {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 32px;
}

/* === 价值主张区 === */
.value-section {
    background: var(--bg-light);
}

.value-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

/* === 公司简介区 === */
.about-section {
    padding: 80px 0;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.about-text h2 {
    font-size: 36px;
    font-weight: 800;
    color: var(--dark);
    margin-bottom: 24px;
    line-height: 1.3;
}

.about-text p {
    font-size: 16px;
    color: var(--gray);
    line-height: 1.9;
    margin-bottom: 16px;
}

.about-features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-top: 32px;
}

.about-feature {
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.about-feature-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    background: var(--blue-50);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    flex-shrink: 0;
}

.about-feature-text h4 {
    font-size: 15px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 2px;
}

.about-feature-text p {
    font-size: 13px;
    color: var(--gray);
    margin: 0;
}

.about-visual {
    position: relative;
}

.about-visual-card {
    background: var(--primary);
    border-radius: var(--radius-xl);
    padding: 48px;
    color: var(--white);
    box-shadow: var(--shadow-xl);
}

.about-visual-card h3 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 20px;
}

.about-visual-card p {
    font-size: 15px;
    opacity: 0.9;
    line-height: 1.8;
    margin-bottom: 24px;
}

.about-visual-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.about-visual-stat {
    text-align: center;
    padding: 16px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius);
    backdrop-filter: blur(10px);
}

.about-visual-stat-num {
    font-size: 32px;
    font-weight: 800;
    line-height: 1;
}

.about-visual-stat-label {
    font-size: 13px;
    opacity: 0.8;
    margin-top: 6px;
}

/* === 产品详情页 === */
.product-detail {
    padding: 80px 0;
}

.product-detail-hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
    margin-bottom: 80px;
}

.product-detail-info h2 {
    font-size: 36px;
    font-weight: 800;
    color: var(--dark);
    margin-bottom: 8px;
}

.product-detail-info .subtitle {
    font-size: 18px;
    color: var(--primary);
    font-weight: 500;
    margin-bottom: 24px;
}

.product-detail-info p {
    font-size: 16px;
    color: var(--gray);
    line-height: 1.9;
    margin-bottom: 24px;
}

.product-detail-features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin-top: 32px;
}

.product-detail-feature {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 15px;
    color: var(--dark-3);
}

.product-detail-feature .check {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: rgba(16, 185, 129, 0.1);
    color: var(--success);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    flex-shrink: 0;
}

.product-detail-visual {
    background: var(--primary);
    border-radius: var(--radius-xl);
    padding: 48px;
    color: var(--white);
    min-height: 360px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    box-shadow: var(--shadow-xl);
}

.product-detail-visual h3 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 24px;
}

.product-detail-visual-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.product-detail-visual-list-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 18px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius);
    backdrop-filter: blur(10px);
}

.product-detail-visual-list-item .icon {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    flex-shrink: 0;
}

.product-detail-visual-list-item .text {
    font-size: 15px;
    font-weight: 500;
}

/* 功能模块网格 */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-item {
    background: var(--white);
    border-radius: var(--radius-md);
    padding: 32px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid var(--gray-lightest);
}

.feature-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.feature-item .icon-box {
    width: 48px;
    height: 48px;
    border-radius: var(--radius);
    background: var(--blue-50);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    margin-bottom: 20px;
}

.feature-item h4 {
    font-size: 18px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 8px;
}

.feature-item p {
    font-size: 14px;
    color: var(--gray);
    line-height: 1.7;
}

/* === 服务体系 === */
.service-flow {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.service-step {
    text-align: center;
    position: relative;
}

.service-step-num {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: var(--primary);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: 800;
    margin: 0 auto 20px;
    box-shadow: var(--shadow-primary);
}

.service-step h4 {
    font-size: 18px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 8px;
}

.service-step p {
    font-size: 14px;
    color: var(--gray);
    line-height: 1.7;
}

.service-step-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    justify-content: center;
    margin-top: 12px;
}

.service-step-tag {
    padding: 3px 10px;
    background: var(--bg-light-2);
    border-radius: var(--radius-full);
    font-size: 12px;
    color: var(--gray);
}

/* === 企业文化 === */
.culture-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.culture-card {
    text-align: center;
    padding: 40px 24px;
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-lightest);
    transition: var(--transition);
}

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

.culture-icon {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: var(--primary);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    margin: 0 auto 20px;
}

.culture-card h4 {
    font-size: 18px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 8px;
}

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

/* === 资质认证 === */
.cert-grid {
    display: flex;
    justify-content: center;
    gap: 32px;
    flex-wrap: wrap;
}

.cert-item {
    text-align: center;
    padding: 32px 48px;
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-lightest);
    min-width: 180px;
}

.cert-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius);
    background: var(--blue-50);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin: 0 auto 12px;
}

.cert-item h4 {
    font-size: 16px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 4px;
}

.cert-item p {
    font-size: 13px;
    color: var(--gray);
}

/* === 优势区域 === */
.advantage-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.advantage-card {
    padding: 40px;
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-lightest);
    transition: var(--transition);
}

.advantage-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.advantage-card .icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius);
    background: var(--primary);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-bottom: 20px;
}

.advantage-card h4 {
    font-size: 20px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 8px;
}

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

/* === 合作伙伴 === */
.partner-grid {
    display: flex;
    justify-content: center;
    gap: 32px;
    flex-wrap: wrap;
}

.partner-item {
    width: 200px;
    height: 100px;
    background: var(--white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-lightest);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    font-weight: 600;
    color: var(--gray);
    transition: var(--transition);
}

.partner-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    color: var(--dark);
    border-color: var(--primary-light);
}

/* === 案例分类标题 === */
.case-category-title {
    font-size: 24px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 32px;
    padding-bottom: 16px;
    border-bottom: 2px solid var(--gray-lightest);
    display: flex;
    align-items: center;
    gap: 12px;
}

.case-category-title::before {
    content: '';
    width: 4px;
    height: 24px;
    background: var(--primary);
    border-radius: var(--radius-full);
}

.case-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 64px;
}

/* === 联系信息卡片 === */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.contact-card {
    text-align: center;
    padding: 48px 32px;
    background: linear-gradient(135deg, var(--white), var(--bg-light));
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--gray-lightest);
    transition: var(--transition);
}

.contact-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-light);
}

.contact-card .icon {
    width: 72px;
    height: 72px;
    border-radius: 50%;
    background: var(--primary);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    margin: 0 auto 20px;
    box-shadow: var(--shadow-primary);
    transition: var(--transition);
}

.contact-card:hover .icon {
    transform: scale(1.1);
    box-shadow: 0 8px 30px var(--blue-400);
}

.contact-card h4 {
    font-size: 20px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 12px;
}

.contact-card p {
    font-size: 15px;
    color: var(--gray);
    line-height: 1.7;
}

/* === 页脚 === */
.footer {
    background: var(--dark);
    color: rgba(255, 255, 255, 0.7);
    padding: 64px 0 0;
}

.footer-main {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 48px;
    padding-bottom: 48px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand .logo {
    margin-bottom: 20px;
}

.footer-brand .logo img {
    height: 44px;
    width: auto;
    display: block;
}

.footer-brand p {
    font-size: 14px;
    line-height: 1.8;
    max-width: 300px;
}

.footer-col h5 {
    font-size: 16px;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 20px;
}

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

.footer-col ul li a {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
    transition: var(--transition-fast);
}

.footer-col ul li a:hover {
    color: var(--white);
}

.footer-contact li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 14px;
    line-height: 1.6;
}

.footer-contact li i {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--blue-200);
    color: var(--primary-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    flex-shrink: 0;
    margin-top: 1px;
}

.footer-bottom {
    padding: 24px 0;
    text-align: center;
    font-size: 14px;
}

.footer-bottom a {
    color: rgba(255, 255, 255, 0.6);
    transition: var(--transition-fast);
}

.footer-bottom a:hover {
    color: var(--white);
}

/* === 网格通用 === */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

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

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

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

.fade-in-up {
    animation: fadeInUp 0.6s ease forwards;
}

.fade-in {
    animation: fadeIn 0.6s ease forwards;
}

/* 滚动触发动画初始状态 */
.scroll-animate {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.scroll-animate.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 延迟 */
.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }
.delay-4 { transition-delay: 0.4s; }

/* === 响应式: 平板 === */
@media (max-width: 1024px) {
    .hero h1 {
        font-size: 44px;
    }

    .hero p {
        font-size: 18px;
    }

    .section-title {
        font-size: 34px;
    }

    .page-banner h1 {
        font-size: 38px;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 32px;
    }

    .value-grid,
    .feature-grid,
    .advantage-grid,
    .culture-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

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

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

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

    .footer-main {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }
}

/* === 响应式: 移动端 === */
@media (max-width: 768px) {
    .nav-menu,
    .nav-actions {
        display: none;
    }

    .hamburger {
        display: flex;
    }

    .hero {
        padding: 120px 0 80px;
        min-height: 500px;
    }

    .hero h1 {
        font-size: 32px;
    }

    .hero p {
        font-size: 16px;
    }

    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }

    .hero-buttons .btn {
        width: 100%;
    }

    .hero-stats {
        gap: 24px;
        margin-top: 48px;
    }

    .hero-stat-num {
        font-size: 32px;
    }

    .hero-stat-label {
        font-size: 12px;
    }

    section {
        padding: 60px 0;
    }

    .section-header {
        margin-bottom: 40px;
    }

    .section-title {
        font-size: 26px;
    }

    .section-subtitle {
        font-size: 15px;
    }

    .page-banner {
        padding: 120px 0 60px;
    }

    .page-banner h1 {
        font-size: 30px;
    }

    .page-banner p {
        font-size: 15px;
    }

    .container {
        padding: 0 20px;
    }

    .product-card,
    .solution-card,
    .feature-card,
    .case-card,
    .feature-item,
    .advantage-card {
        padding: 24px;
    }

    .grid-2,
    .grid-3,
    .grid-4,
    .value-grid,
    .feature-grid,
    .advantage-grid,
    .culture-grid,
    .service-flow,
    .case-grid,
    .contact-grid {
        grid-template-columns: 1fr;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }

    .stat-num {
        font-size: 36px;
    }

    .about-features {
        grid-template-columns: 1fr;
    }

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

    .product-detail-visual {
        padding: 32px;
    }

    .timeline::before {
        left: 20px;
    }

    .timeline-item {
        width: 100%;
        left: 0 !important;
        text-align: left !important;
        padding-left: 52px;
        padding-right: 0;
    }

    .timeline-item:nth-child(odd) .timeline-dot,
    .timeline-item:nth-child(even) .timeline-dot {
        left: 12px;
        right: auto;
    }

    .footer-main {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .footer-bottom {
        font-size: 13px;
    }

    .cta-content h2 {
        font-size: 26px;
    }

    .cta-content p {
        font-size: 15px;
    }

    .about-text h2 {
        font-size: 26px;
    }

    .about-visual-card {
        padding: 32px;
    }

    .cert-grid {
        gap: 16px;
    }

    .cert-item {
        min-width: 140px;
        padding: 24px;
    }
}

/* === 响应式: 小屏手机 === */
@media (max-width: 480px) {
    .hero h1 {
        font-size: 26px;
    }

    .hero-stat-num {
        font-size: 28px;
    }

    .section-title {
        font-size: 22px;
    }

    .page-banner h1 {
        font-size: 24px;
    }

    .stat-num {
        font-size: 32px;
    }

    .case-metric-num {
        font-size: 20px;
    }

    .logo {
        font-size: 17px;
    }

    .logo-icon {
        width: 32px;
        height: 32px;
        font-size: 17px;
    }
}

/* === 超大屏 === */
@media (min-width: 1400px) {
    :root {
        --max-width: 1280px;
    }

    .hero h1 {
        font-size: 64px;
    }
}