/* ================================
   苏州ST信息科技有限公司 - 官网样式
   风格：简约大气 | 科技感
   ================================ */

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

:root {
    /* 主色调 - 科技深蓝 */
    --color-primary: #0A1628;
    --color-primary-light: #122A45;
    --color-accent: #2D7FF9;
    --color-accent-light: #5BA3FC;
    --color-accent-gradient: linear-gradient(135deg, #2D7FF9 0%, #00D4FF 100%);
    /* 中性色 */
    --color-white: #FFFFFF;
    --color-bg: #FAFBFC;
    --color-bg-alt: #F1F5F9;
    --color-text: #1E293B;
    --color-text-muted: #64748B;
    --color-text-light: #94A3B8;
    --color-border: #E2E8F0;
    /* 阴影 */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);
    --shadow-glow: 0 0 40px rgba(45, 127, 249, 0.15);
    /* 圆角 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    /* 间距 */
    --section-padding: 100px 0;
    --container-max: 1200px;
    /* 过渡 */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, sans-serif;
    color: var(--color-text);
    background: var(--color-white);
    line-height: 1.7;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

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

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

/* ---------- 通用按钮 ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    letter-spacing: 0.5px;
}

.btn-primary {
    background: var(--color-accent-gradient);
    color: var(--color-white);
    box-shadow: 0 4px 16px rgba(45, 127, 249, 0.35);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(45, 127, 249, 0.45);
}

.btn-outline {
    background: transparent;
    color: var(--color-white);
    border: 1.5px solid rgba(255, 255, 255, 0.4);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--color-white);
}

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

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

/* ---------- 导航栏 ---------- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 20px 0;
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: var(--shadow-sm);
    padding: 14px 0;
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 700;
    letter-spacing: 0.5px;
}

.logo-icon {
    width: 38px;
    height: 38px;
    border-radius: 10px;
    background: var(--color-accent-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-white);
    font-size: 18px;
    font-weight: 800;
    flex-shrink: 0;
}

.logo-text {
    color: var(--color-primary);
}

.navbar:not(.scrolled) .logo-text {
    color: var(--color-white);
}

.nav-links {
    display: flex;
    gap: 36px;
}

.nav-links a {
    font-size: 15px;
    font-weight: 500;
    color: var(--color-text-muted);
    position: relative;
    transition: var(--transition);
    padding: 4px 0;
}

.navbar:not(.scrolled) .nav-links a {
    color: rgba(255, 255, 255, 0.85);
}

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

.navbar:not(.scrolled) .nav-links a:hover,
.navbar:not(.scrolled) .nav-links a.active {
    color: var(--color-white);
}

.nav-links a::after {
    content: "";
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: width 0.3s ease;
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

.navbar:not(.scrolled) .nav-links a:hover::after,
.navbar:not(.scrolled) .nav-links a.active::after {
    background: var(--color-white);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-primary);
    transition: var(--transition);
    border-radius: 2px;
}

.navbar:not(.scrolled) .nav-toggle span {
    background: var(--color-white);
}

/* ---------- Hero 区域 ---------- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: var(--color-primary);
    overflow: hidden;
    padding-top: 80px;
}

.hero::before {
    content: "";
    position: absolute;
    top: -50%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(45, 127, 249, 0.2) 0%, transparent 70%);
    border-radius: 50%;
}

.hero::after {
    content: "";
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(0, 212, 255, 0.12) 0%, transparent 70%);
    border-radius: 50%;
}

.hero-content {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 60px;
    align-items: center;
    width: 100%;
}

.hero-text h1 {
    font-size: 52px;
    font-weight: 800;
    line-height: 1.25;
    color: var(--color-white);
    margin-bottom: 24px;
    letter-spacing: -0.5px;
}

.hero-text h1 .gradient-text {
    background: var(--color-accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-text p {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 36px;
    line-height: 1.8;
    max-width: 520px;
}

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

.hero-visual {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-card-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    width: 100%;
}

.hero-float-card {
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--radius-md);
    padding: 24px;
    transition: var(--transition);
}

.hero-float-card:hover {
    background: rgba(255, 255, 255, 0.12);
    transform: translateY(-4px);
}

.hero-float-card .icon-box {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    background: var(--color-accent-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 14px;
    font-size: 22px;
}

.hero-float-card h4 {
    color: var(--color-white);
    font-size: 16px;
    margin-bottom: 6px;
}

.hero-float-card p {
    color: rgba(255, 255, 255, 0.6);
    font-size: 13px;
    margin: 0;
}

.hero-stats {
    display: flex;
    gap: 40px;
    margin-top: 48px;
    padding-top: 36px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.hero-stat .num {
    font-size: 32px;
    font-weight: 800;
    color: var(--color-white);
}

.hero-stat .num .plus {
    color: var(--color-accent-light);
}

.hero-stat .label {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.5);
    margin-top: 4px;
}

/* ---------- 通用 Section ---------- */
.section {
    padding: var(--section-padding);
}

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

.section-alt {
    background: var(--color-bg-alt);
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 64px;
}

.section-tag {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(45, 127, 249, 0.1);
    color: var(--color-accent);
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 16px;
    letter-spacing: 1px;
}

.section-title {
    font-size: 38px;
    font-weight: 800;
    color: var(--color-primary);
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

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

/* ---------- 服务卡片 ---------- */
.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.service-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    border: 1px solid var(--color-border);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--color-accent-gradient);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease;
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

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

.service-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, rgba(45, 127, 249, 0.1), rgba(0, 212, 255, 0.1));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    margin-bottom: 24px;
}

.service-card h3 {
    font-size: 22px;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 12px;
}

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

.service-features {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.service-features li {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: var(--color-text);
}

.service-features li::before {
    content: "✓";
    color: var(--color-accent);
    font-weight: 700;
    flex-shrink: 0;
}

/* ---------- 关于简介区 ---------- */
.about-preview {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.about-preview-text .section-tag {
    margin-bottom: 16px;
}

.about-preview-text h2 {
    font-size: 36px;
    font-weight: 800;
    color: var(--color-primary);
    margin-bottom: 20px;
    line-height: 1.3;
}

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

.about-preview-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-top: 32px;
}

.about-stat {
    padding: 24px;
    background: var(--color-white);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    text-align: center;
}

.about-stat .num {
    font-size: 34px;
    font-weight: 800;
    background: var(--color-accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.about-stat .label {
    font-size: 14px;
    color: var(--color-text-muted);
    margin-top: 6px;
}

.about-preview-visual {
    position: relative;
}

.about-visual-card {
    background: var(--color-primary);
    border-radius: var(--radius-lg);
    padding: 48px;
    position: relative;
    overflow: hidden;
}

.about-visual-card::before {
    content: "";
    position: absolute;
    top: -40px;
    right: -40px;
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, rgba(45, 127, 249, 0.3) 0%, transparent 70%);
    border-radius: 50%;
}

.about-visual-card h3 {
    color: var(--color-white);
    font-size: 24px;
    margin-bottom: 20px;
    position: relative;
    z-index: 2;
}

.about-visual-card .mission-list {
    position: relative;
    z-index: 2;
}

.about-visual-card .mission-list li {
    color: rgba(255, 255, 255, 0.8);
    font-size: 15px;
    padding: 12px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    gap: 12px;
}

.about-visual-card .mission-list li:last-child {
    border-bottom: none;
}

.about-visual-card .mission-list .dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-accent-light);
    flex-shrink: 0;
}

/* ---------- CTA 区域 ---------- */
.cta-section {
    padding: 80px 0;
    background: var(--color-white);
}

.cta-box {
    background: var(--color-primary);
    border-radius: var(--radius-lg);
    padding: 64px 48px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-box::before {
    content: "";
    position: absolute;
    top: -100px;
    right: -50px;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(45, 127, 249, 0.25) 0%, transparent 70%);
    border-radius: 50%;
}

.cta-box::after {
    content: "";
    position: absolute;
    bottom: -100px;
    left: -50px;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(0, 212, 255, 0.15) 0%, transparent 70%);
    border-radius: 50%;
}

.cta-box h2 {
    font-size: 34px;
    font-weight: 800;
    color: var(--color-white);
    margin-bottom: 16px;
    position: relative;
    z-index: 2;
}

.cta-box p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 17px;
    margin-bottom: 32px;
    position: relative;
    z-index: 2;
}

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

/* ---------- 页面头部 Banner ---------- */
.page-banner {
    background: var(--color-primary);
    padding: 160px 0 80px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.page-banner::before {
    content: "";
    position: absolute;
    top: -30%;
    right: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(45, 127, 249, 0.18) 0%, transparent 70%);
    border-radius: 50%;
}

.page-banner::after {
    content: "";
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(0, 212, 255, 0.1) 0%, transparent 70%);
    border-radius: 50%;
}

.page-banner h1 {
    font-size: 44px;
    font-weight: 800;
    color: var(--color-white);
    margin-bottom: 16px;
    position: relative;
    z-index: 2;
}

.page-banner p {
    font-size: 17px;
    color: rgba(255, 255, 255, 0.65);
    position: relative;
    z-index: 2;
}

.breadcrumb {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 20px;
    font-size: 14px;
    position: relative;
    z-index: 2;
}

.breadcrumb a {
    color: rgba(255, 255, 255, 0.5);
    transition: var(--transition);
}

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

.breadcrumb span {
    color: rgba(255, 255, 255, 0.3);
}

.breadcrumb .current {
    color: var(--color-accent-light);
}

/* ---------- 关于我们页面 ---------- */
.about-story {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.about-story-text h2 {
    font-size: 32px;
    font-weight: 800;
    color: var(--color-primary);
    margin-bottom: 20px;
}

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

.about-story-visual {
    background: var(--color-accent-gradient);
    border-radius: var(--radius-lg);
    padding: 48px;
    color: var(--color-white);
    position: relative;
    overflow: hidden;
}

.about-story-visual::before {
    content: "";
    position: absolute;
    top: -30px;
    right: -30px;
    width: 180px;
    height: 180px;
    border: 2px solid rgba(255, 255, 255, 0.15);
    border-radius: 50%;
}

.about-story-visual::after {
    content: "";
    position: absolute;
    bottom: -50px;
    left: -50px;
    width: 220px;
    height: 220px;
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: 50%;
}

.about-story-visual .quote-icon {
    font-size: 48px;
    opacity: 0.3;
    margin-bottom: 16px;
}

.about-story-visual .quote-text {
    font-size: 20px;
    font-weight: 600;
    line-height: 1.7;
    margin-bottom: 24px;
    position: relative;
    z-index: 2;
}

.about-story-visual .quote-author {
    font-size: 15px;
    opacity: 0.8;
    position: relative;
    z-index: 2;
}

/* 价值观卡片 */
.values-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.value-card {
    text-align: center;
    padding: 36px 24px;
    background: var(--color-white);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    transition: var(--transition);
}

.value-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-accent);
}

.value-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 18px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(45, 127, 249, 0.1), rgba(0, 212, 255, 0.1));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}

.value-card h4 {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 10px;
}

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

/* 时间线 */
.timeline {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}

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

.timeline-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: 48px;
    position: relative;
}

.timeline-item:nth-child(odd) {
    flex-direction: row-reverse;
    text-align: right;
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-content {
    width: calc(50% - 36px);
    padding: 24px;
    background: var(--color-white);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.timeline-content:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.timeline-year {
    font-size: 20px;
    font-weight: 800;
    color: var(--color-accent);
    margin-bottom: 8px;
}

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

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

.timeline-dot {
    position: absolute;
    left: 50%;
    top: 24px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--color-white);
    border: 4px solid var(--color-accent);
    transform: translateX(-50%);
    z-index: 2;
}

/* ---------- 产品服务页面 ---------- */
.product-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
    margin-bottom: 100px;
}

.product-section:last-child {
    margin-bottom: 0;
}

.product-section:nth-child(even) .product-visual {
    order: -1;
}

.product-visual {
    background: var(--color-primary);
    border-radius: var(--radius-lg);
    padding: 48px;
    min-height: 360px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.product-visual::before {
    content: "";
    position: absolute;
    top: -50px;
    right: -50px;
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, rgba(45, 127, 249, 0.25) 0%, transparent 70%);
    border-radius: 50%;
}

.product-visual-icon {
    font-size: 56px;
    margin-bottom: 24px;
    position: relative;
    z-index: 2;
}

.product-visual h3 {
    color: var(--color-white);
    font-size: 24px;
    margin-bottom: 16px;
    position: relative;
    z-index: 2;
}

.product-visual p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 15px;
    line-height: 1.8;
    position: relative;
    z-index: 2;
}

.product-info .section-tag {
    margin-bottom: 12px;
}

.product-info h2 {
    font-size: 32px;
    font-weight: 800;
    color: var(--color-primary);
    margin-bottom: 20px;
}

.product-info > p {
    color: var(--color-text-muted);
    font-size: 16px;
    line-height: 1.9;
    margin-bottom: 28px;
}

.product-features-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 28px;
}

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

.product-feature .check {
    width: 24px;
    height: 24px;
    border-radius: 6px;
    background: rgba(45, 127, 249, 0.1);
    color: var(--color-accent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 700;
    flex-shrink: 0;
    margin-top: 2px;
}

.product-feature-text h5 {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 4px;
}

.product-feature-text p {
    font-size: 13px;
    color: var(--color-text-muted);
    margin: 0;
    line-height: 1.6;
}

.product-tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.tech-tag {
    padding: 6px 14px;
    background: var(--color-bg-alt);
    border-radius: 20px;
    font-size: 13px;
    color: var(--color-text-muted);
    font-weight: 500;
}

/* 技术能力区 */
.tech-stack-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.tech-stack-card {
    background: var(--color-white);
    border-radius: var(--radius-md);
    padding: 36px 28px;
    border: 1px solid var(--color-border);
    transition: var(--transition);
}

.tech-stack-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-md);
}

.tech-stack-card .icon-box {
    width: 52px;
    height: 52px;
    border-radius: var(--radius-sm);
    background: var(--color-accent-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-bottom: 20px;
    color: var(--color-white);
}

.tech-stack-card h4 {
    font-size: 19px;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 12px;
}

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

/* ---------- 联系我们页面 ---------- */
.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 48px;
}

.contact-info-card {
    background: var(--color-primary);
    border-radius: var(--radius-lg);
    padding: 48px;
    color: var(--color-white);
    position: relative;
    overflow: hidden;
}

.contact-info-card::before {
    content: "";
    position: absolute;
    top: -60px;
    right: -60px;
    width: 240px;
    height: 240px;
    background: radial-gradient(circle, rgba(45, 127, 249, 0.2) 0%, transparent 70%);
    border-radius: 50%;
}

.contact-info-card h3 {
    font-size: 24px;
    margin-bottom: 8px;
    position: relative;
    z-index: 2;
}

.contact-info-card > p {
    color: rgba(255, 255, 255, 0.6);
    font-size: 15px;
    margin-bottom: 36px;
    position: relative;
    z-index: 2;
}

.contact-info-list {
    position: relative;
    z-index: 2;
}

.contact-info-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
    padding: 20px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

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

.contact-info-item .icon-box {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    flex-shrink: 0;
}

.contact-info-item .label {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.5);
    margin-bottom: 4px;
}

.contact-info-item .value {
    font-size: 15px;
    color: var(--color-white);
    font-weight: 500;
}

.contact-form-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    padding: 48px;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}

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

.contact-form-card > p {
    color: var(--color-text-muted);
    font-size: 15px;
    margin-bottom: 32px;
}

.form-group {
    margin-bottom: 22px;
}

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

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

.form-group label .required {
    color: #ef4444;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-family: inherit;
    color: var(--color-text);
    background: var(--color-bg);
    transition: var(--transition);
    outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--color-accent);
    background: var(--color-white);
    box-shadow: 0 0 0 3px rgba(45, 127, 249, 0.1);
}

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

.form-submit {
    width: 100%;
    justify-content: center;
}

.form-success {
    display: none;
    padding: 16px 20px;
    background: rgba(34, 197, 94, 0.1);
    border: 1px solid rgba(34, 197, 94, 0.3);
    border-radius: var(--radius-sm);
    color: #16a34a;
    font-size: 14px;
    margin-bottom: 20px;
    align-items: center;
    gap: 8px;
}

.form-success.show {
    display: flex;
}

/* 地图区 */
.map-section {
    padding: 0 0 100px;
}

.map-box {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-border);
}

.map-box iframe {
    width: 100%;
    height: 420px;
    border: 0;
    display: block;
}

/* ---------- 页脚 ---------- */
.footer {
    background: var(--color-primary);
    color: rgba(255, 255, 255, 0.6);
    padding: 72px 0 0;
}

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

.footer-brand .logo {
    margin-bottom: 16px;
}

.footer-brand .logo-text {
    color: var(--color-white);
}

.footer-brand p {
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 20px;
    max-width: 320px;
}

.footer-social {
    display: flex;
    gap: 12px;
}

.footer-social a {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.08);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    transition: var(--transition);
}

.footer-social a:hover {
    background: var(--color-accent);
    color: var(--color-white);
    transform: translateY(-2px);
}

.footer-col h4 {
    color: var(--color-white);
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 20px;
}

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

.footer-col ul li a {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.55);
    transition: var(--transition);
}

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

.footer-bottom {
    padding: 24px 0;
    text-align: center;
    font-size: 13px;
    color: rgba(255, 255, 255, 0.4);
}

/* ---------- 动画 ---------- */
.fade-up {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}

.fade-up:nth-child(2) {
    transition-delay: 0.1s;
}

.fade-up:nth-child(3) {
    transition-delay: 0.2s;
}

.fade-up:nth-child(4) {
    transition-delay: 0.3s;
}

/* ---------- 响应式 ---------- */
@media (max-width: 992px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .hero-text h1 {
        font-size: 40px;
    }

    .about-preview,
    .about-story,
    .product-section,
    .contact-wrapper {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .product-section:nth-child(even) .product-visual {
        order: 0;
    }

    .services-grid,
    .values-grid,
    .tech-stack-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-top {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding: 64px 0;
    }

    .nav-links {
        display: none;
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        background: var(--color-white);
        flex-direction: column;
        padding: 24px;
        gap: 16px;
        box-shadow: var(--shadow-md);
    }

    .nav-links.open {
        display: flex;
    }

    .nav-links a {
        color: var(--color-text) !important;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

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

    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }

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

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

    .hero-stats {
        flex-wrap: wrap;
        gap: 24px;
    }

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

    .section-title {
        font-size: 28px;
    }

    .services-grid,
    .values-grid,
    .tech-stack-grid,
    .about-preview-stats,
    .product-features-list,
    .form-row {
        grid-template-columns: 1fr;
    }

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

    .timeline-item,
    .timeline-item:nth-child(odd) {
        flex-direction: row;
        text-align: left;
    }

    .timeline-content {
        width: calc(100% - 50px);
        margin-left: 50px;
    }

    .timeline-dot {
        left: 20px;
    }

    .footer-top {
        grid-template-columns: 1fr;
    }

    .cta-box {
        padding: 40px 24px;
    }

    .cta-box h2 {
        font-size: 24px;
    }

    .contact-info-card,
    .contact-form-card,
    .about-visual-card,
    .product-visual {
        padding: 32px 24px;
    }

    .page-banner {
        padding: 130px 0 60px;
    }

    .page-banner h1 {
        font-size: 32px;
    }
}