/* ========================================
   企业官网 - 完整样式表
   主色调: #0d6efd (科技蓝)
   辅色: #0b5ed7, #0dcaf0
   ======================================== */

/* ----- CSS 变量 ----- */
:root {
    --primary: #0d6efd;
    --primary-dark: #0b5ed7;
    --primary-light: #3d8bfd;
    --accent: #0dcaf0;
    --dark: #1a1a2e;
    --gray-100: #f8f9fa;
    --gray-200: #e9ecef;
    --gray-300: #dee2e6;
    --gray-500: #6c757d;
    --gray-700: #495057;
    --gray-900: #212529;
    --white: #ffffff;
    --shadow-sm: 0 2px 12px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 24px rgba(0,0,0,0.12);
    --shadow-lg: 0 8px 48px rgba(0,0,0,0.16);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: 0.3s ease;
    --font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    --max-width: 1200px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    color: var(--gray-900);
    background: var(--gray-100);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

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

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

ul { list-style: none; }

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* ----- 通用标题 ----- */
.section-title {
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 12px;
    position: relative;
}

.section-subtitle {
    text-align: center;
    font-size: 1.05rem;
    color: var(--gray-500);
    margin-bottom: 48px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    border-radius: 2px;
    margin: 12px auto 0;
}

/* ----- Header / 导航栏 ----- */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--white);
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition);
    height: 72px;
}

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

.header-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo span {
    color: var(--dark);
}

.logo-icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 1.2rem;
    font-weight: 700;
}

nav {
    display: flex;
    align-items: center;
}

nav ul {
    display: flex;
    gap: 4px;
}

nav ul li a {
    display: block;
    padding: 8px 18px;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--gray-700);
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    position: relative;
}

nav ul li a:hover {
    color: var(--primary);
    background: rgba(13, 110, 253, 0.06);
}

nav ul li a.active {
    color: var(--white);
    background: var(--primary);
}

/* ----- 语言切换按钮 ----- */
.lang-toggle {
    margin-left: 12px;
    padding: 6px 14px;
    border: 2px solid var(--primary);
    border-radius: 20px;
    background: transparent;
    color: var(--primary);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    font-family: var(--font-family);
}

.lang-toggle:hover {
    background: var(--primary);
    color: var(--white);
}

/* ----- Hero / 轮播区 ----- */
.hero-carousel {
    position: relative;
    height: 600px;
    margin-top: 72px;
    overflow: hidden;
    background: var(--dark);
}

.carousel-slides {
    position: relative;
    height: 100%;
}

.carousel-slide {
    position: absolute;
    inset: 0;
    opacity: 0;
    transition: opacity 0.8s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.carousel-slide.active {
    opacity: 1;
}

.slide-bg {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    filter: brightness(0.55);
}

.slide-bg-1 { background: linear-gradient(135deg, #0d6efd 0%, #0dcaf0 100%); }
.slide-bg-2 { background: linear-gradient(135deg, #1a1a2e 0%, #0d6efd 100%); }
.slide-bg-3 { background: linear-gradient(135deg, #0b5ed7 0%, #6610f2 100%); }

.slide-content {
    position: relative;
    text-align: center;
    color: var(--white);
    padding: 0 20px;
    max-width: 720px;
}

.slide-content h1 {
    font-size: 2.8rem;
    font-weight: 800;
    margin-bottom: 16px;
    line-height: 1.2;
    color: var(--white);
}

.slide-content p {
    font-size: 1.15rem;
    color: rgba(255,255,255,0.85);
    margin-bottom: 32px;
    line-height: 1.7;
}

.slide-content .btn {
    display: inline-block;
    padding: 14px 36px;
    background: var(--white);
    color: var(--primary);
    font-size: 1rem;
    font-weight: 600;
    border-radius: 50px;
    transition: all var(--transition);
    border: none;
    cursor: pointer;
}

.slide-content .btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(255,255,255,0.25);
}

/* 轮播控制器 */
.carousel-controls {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
    z-index: 5;
}

.carousel-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255,255,255,0.4);
    border: none;
    cursor: pointer;
    transition: all var(--transition);
}

.carousel-dot.active {
    background: var(--white);
    transform: scale(1.25);
}

.carousel-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 5;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: rgba(255,255,255,0.15);
    color: var(--white);
    border: 2px solid rgba(255,255,255,0.3);
    font-size: 1.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
    backdrop-filter: blur(4px);
}

.carousel-arrow:hover {
    background: rgba(255,255,255,0.3);
}

.carousel-arrow.prev { left: 24px; }
.carousel-arrow.next { right: 24px; }

/* ----- 关系图区 ----- */
.relationship-section {
    padding: 80px 0;
    background: var(--white);
}

.relationship-diagram {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
    padding: 40px 0;
}

.rel-center {
    width: 160px;
    height: 160px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-weight: 700;
    font-size: 1.1rem;
    box-shadow: var(--shadow-lg);
    position: relative;
    flex-shrink: 0;
}

.rel-center small {
    font-size: 0.75rem;
    font-weight: 400;
    opacity: 0.85;
    margin-top: 4px;
}

.rel-node {
    width: 130px;
    padding: 24px 16px;
    background: var(--gray-100);
    border-radius: var(--radius);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition);
    cursor: default;
    border: 2px solid transparent;
}

.rel-node:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.rel-node .icon {
    font-size: 2rem;
    margin-bottom: 8px;
    color: var(--primary);
}

.rel-node h4 {
    font-size: 0.95rem;
    color: var(--dark);
    font-weight: 600;
}

.rel-connector {
    font-size: 1.5rem;
    color: var(--primary);
    font-weight: 700;
    flex-shrink: 0;
}

/* ----- 优势区 ----- */
.advantages-section {
    padding: 80px 0;
    background: var(--gray-100);
}

.advantages-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    max-width: 900px;
    margin: 0 auto;
}

.advantage-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 32px 28px;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition);
    opacity: 0;
    transform: translateY(30px);
}

.advantage-card.visible {
    opacity: 1;
    transform: translateY(0);
}

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

.advantage-card .icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: rgba(13, 110, 253, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 16px;
    color: var(--primary);
}

.advantage-card h3 {
    font-size: 1.15rem;
    margin-bottom: 10px;
    color: var(--dark);
}

.advantage-card p {
    font-size: 0.92rem;
    color: var(--gray-500);
    line-height: 1.7;
}

/* ----- Footer / 底部备案 ----- */
footer {
    background: var(--dark);
    color: var(--white);
    padding: 48px 0 0;
}

.footer-content {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 40px;
}

.footer-brand h3 {
    font-size: 1.3rem;
    margin-bottom: 12px;
    color: var(--white);
}

.footer-brand p {
    font-size: 0.9rem;
    color: rgba(255,255,255,0.6);
    line-height: 1.7;
}

.footer-links h4,
.footer-contact h4 {
    font-size: 1rem;
    margin-bottom: 14px;
    color: var(--white);
}

.footer-links ul li {
    margin-bottom: 8px;
}

.footer-links ul li a {
    color: rgba(255,255,255,0.6);
    font-size: 0.9rem;
    transition: color var(--transition);
}

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

.footer-contact p {
    font-size: 0.9rem;
    color: rgba(255,255,255,0.6);
    margin-bottom: 6px;
}

.footer-bottom {
    margin-top: 40px;
    padding: 16px 20px;
    text-align: center;
    border-top: 1px solid rgba(255,255,255,0.08);
    font-size: 0.85rem;
    color: rgba(255,255,255,0.4);
}

/* ----- 页面Banner（产品/服务页顶部） ----- */
.page-banner {
    margin-top: 72px;
    padding: 80px 0 60px;
    background: linear-gradient(135deg, var(--primary) 0%, #0b5ed7 100%);
    color: var(--white);
    text-align: center;
}

.page-banner h1 {
    font-size: 2.4rem;
    font-weight: 800;
    margin-bottom: 12px;
    color: var(--white);
}

.page-banner p {
    font-size: 1.1rem;
    color: rgba(255,255,255,0.8);
    max-width: 600px;
    margin: 0 auto;
}

/* ----- 产品/服务列表页 ----- */
.list-section {
    padding: 60px 0;
}

.list-item {
    display: flex;
    gap: 48px;
    align-items: center;
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: all var(--transition);
    cursor: pointer;
    margin-bottom: 32px;
}

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

.list-item:nth-child(even) {
    flex-direction: row-reverse;
}

.list-item-image {
    flex: 0 0 40%;
    height: 280px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3.5rem;
    color: var(--white);
    position: relative;
    overflow: hidden;
}

.list-item-image .img-bg {
    position: absolute;
    inset: 0;
    opacity: 0.9;
}

.list-item-image .img-text {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 20px;
}

.list-item-image .img-text .big-icon {
    font-size: 4rem;
    display: block;
    margin-bottom: 8px;
}

.list-item-image .img-text .img-label {
    font-size: 0.9rem;
    opacity: 0.85;
}

.list-item-content {
    flex: 1;
    padding: 32px 32px 32px 0;
}

.list-item:nth-child(even) .list-item-content {
    padding: 32px 0 32px 32px;
}

.list-item-content h3 {
    font-size: 1.4rem;
    color: var(--dark);
    margin-bottom: 8px;
}

.list-item-content .tag {
    display: inline-block;
    padding: 3px 12px;
    background: rgba(13, 110, 253, 0.08);
    color: var(--primary);
    font-size: 0.8rem;
    font-weight: 600;
    border-radius: 20px;
    margin-bottom: 14px;
}

.list-item-content p {
    font-size: 0.95rem;
    color: var(--gray-500);
    line-height: 1.7;
    margin-bottom: 16px;
}

.list-item-content .learn-more {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--primary);
    font-weight: 600;
    font-size: 0.9rem;
}

.list-item-content .learn-more:hover {
    gap: 10px;
}

/* ----- 服务流程图 ----- */
.process-section {
    padding: 60px 0 40px;
    background: var(--white);
}

.process-flow {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: 0;
    flex-wrap: wrap;
    padding: 20px 0;
}

.process-step {
    text-align: center;
    padding: 24px 20px;
    flex: 1;
    min-width: 130px;
    max-width: 180px;
    position: relative;
}

.process-step .step-num {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--primary);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.1rem;
    margin: 0 auto 12px;
    transition: all var(--transition);
}

.process-step:hover .step-num {
    transform: scale(1.1);
    box-shadow: 0 4px 16px rgba(13,110,253,0.3);
}

.process-step h4 {
    font-size: 0.95rem;
    color: var(--dark);
    margin-bottom: 6px;
}

.process-step p {
    font-size: 0.82rem;
    color: var(--gray-500);
}

.process-arrow {
    width: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 52px;
    color: var(--primary);
    font-size: 1.5rem;
    font-weight: 300;
    flex-shrink: 0;
}

/* ----- 联系我们页 ----- */
.contact-info-section {
    padding: 60px 0;
    background: var(--white);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 24px;
}

.contact-card {
    background: var(--gray-100);
    border-radius: var(--radius);
    padding: 32px 24px;
    text-align: center;
    transition: all var(--transition);
}

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

.contact-card .icon {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: rgba(13, 110, 253, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    margin: 0 auto 16px;
    color: var(--primary);
}

.contact-card h4 {
    font-size: 1rem;
    margin-bottom: 8px;
    color: var(--dark);
}

.contact-card p {
    font-size: 0.92rem;
    color: var(--gray-500);
    line-height: 1.6;
}

.contact-card .qrcode-placeholder {
    width: 120px;
    height: 120px;
    background: var(--gray-200);
    border-radius: var(--radius-sm);
    margin: 12px auto 0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gray-500);
    font-size: 0.8rem;
    border: 2px dashed var(--gray-300);
}

/* 联系表单 */
.contact-form-section {
    padding: 60px 0;
    background: var(--gray-100);
}

.contact-form-wrapper {
    max-width: 640px;
    margin: 0 auto;
    background: var(--white);
    border-radius: var(--radius);
    padding: 48px;
    box-shadow: var(--shadow-sm);
}

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

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 6px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-family: var(--font-family);
    transition: border-color var(--transition);
    outline: none;
    background: var(--white);
    color: var(--gray-900);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--primary);
}

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

.submit-btn {
    width: 100%;
    padding: 14px;
    background: var(--primary);
    color: var(--white);
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
}

.submit-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(13,110,253,0.3);
}

#formStatus {
    margin-top: 16px;
    text-align: center;
    font-size: 0.9rem;
    color: var(--gray-700);
}

/* ----- 详情页 ----- */
.detail-banner {
    margin-top: 72px;
    padding: 80px 0;
    color: var(--white);
    text-align: center;
    position: relative;
}

.detail-banner .banner-bg {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    filter: brightness(0.5);
}

.detail-banner h1 {
    position: relative;
    font-size: 2.4rem;
    font-weight: 800;
    color: var(--white);
    margin-bottom: 12px;
}

.detail-banner p {
    position: relative;
    font-size: 1.05rem;
    color: rgba(255,255,255,0.8);
    max-width: 600px;
    margin: 0 auto;
}

.detail-section {
    padding: 60px 0;
    background: var(--white);
}

.detail-section:nth-child(even) {
    background: var(--gray-100);
}

.detail-content {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

.detail-content h2 {
    font-size: 1.6rem;
    color: var(--dark);
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 3px solid var(--primary);
    display: inline-block;
}

.detail-content p {
    font-size: 1rem;
    color: var(--gray-700);
    line-height: 1.8;
    margin-bottom: 16px;
}

.detail-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-top: 24px;
}

.detail-feature-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 16px 20px;
    background: var(--gray-100);
    border-radius: var(--radius-sm);
}

.detail-feature-item .check {
    color: var(--primary);
    font-weight: 700;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.detail-feature-item div h4 {
    font-size: 1rem;
    margin-bottom: 4px;
    color: var(--dark);
}

.detail-feature-item div p {
    font-size: 0.85rem;
    margin-bottom: 0;
    color: var(--gray-500);
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 24px;
    transition: gap var(--transition);
}

.back-link:hover {
    gap: 10px;
}

/* ----- 滚动动画 ----- */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ----- 响应式 ----- */

/* 大屏 / 笔记本 (<=1200px) */
@media (max-width: 1200px) {
    .relationship-diagram {
        flex-wrap: wrap;
        justify-content: center;
    }
}

/* 平板横屏 (<=992px) */
@media (max-width: 992px) {
    .hero-carousel { height: 450px; }
    .slide-content h1 { font-size: 2.2rem; }
    .slide-content p { font-size: 1rem; }

    .rel-center { width: 120px; height: 120px; font-size: 0.9rem; }
    .rel-node { width: 110px; padding: 16px 12px; }
    .rel-node .icon { font-size: 1.6rem; }
    .rel-connector { font-size: 1.2rem; }

    .list-item { flex-direction: column !important; }
    .list-item-image { flex: none; width: 100%; height: 200px; }
    .list-item-content { padding: 24px !important; }
    .list-item-content h3 { font-size: 1.2rem; }

    .footer-content { grid-template-columns: 1fr 1fr; }
    .process-arrow { display: none; }
    .detail-features { grid-template-columns: 1fr; }

    .contact-form-wrapper { padding: 36px; }
}

/* 平板竖屏 / 大手机 (<=768px) */
@media (max-width: 768px) {
    header { height: 56px; }
    .header-inner { height: 56px; padding: 0 12px; }
    .hero-carousel { height: 340px; margin-top: 56px; }
    .page-banner { margin-top: 56px; padding: 48px 0 32px; }
    .detail-banner { margin-top: 56px; padding: 48px 0; }

    .logo { font-size: 1rem; }
    .logo-icon { width: 28px; height: 28px; font-size: 0.8rem; }

    nav ul { gap: 2px; }
    nav ul li a {
        padding: 5px 10px;
        font-size: 0.8rem;
    }

    .lang-toggle {
        margin-left: 6px;
        padding: 4px 10px;
        font-size: 0.75rem;
    }

    .slide-content h1 { font-size: 1.5rem; }
    .slide-content p { font-size: 0.9rem; margin-bottom: 20px; }
    .slide-content .btn { padding: 10px 24px; font-size: 0.9rem; }

    .relationship-section,
    .advantages-section,
    .list-section,
    .process-section,
    .contact-info-section,
    .contact-form-section,
    .detail-section {
        padding: 48px 0;
    }

    .section-title { font-size: 1.5rem; }
    .section-subtitle { font-size: 0.9rem; margin-bottom: 32px; }

    .advantages-grid { grid-template-columns: 1fr; gap: 16px; }
    .advantage-card { padding: 24px 20px; }
    .advantage-card .icon { width: 40px; height: 40px; font-size: 1.2rem; }
    .advantage-card h3 { font-size: 1.05rem; }
    .advantage-card p { font-size: 0.88rem; }

    .relationship-diagram {
        flex-direction: column;
        gap: 6px;
    }
    .rel-connector { transform: rotate(90deg); }
    .rel-center { width: 100px; height: 100px; font-size: 0.8rem; }
    .rel-node { width: 100px; padding: 12px 8px; }
    .rel-node .icon { font-size: 1.4rem; margin-bottom: 4px; }
    .rel-node h4 { font-size: 0.8rem; }

    .process-flow { flex-direction: column; align-items: center; gap: 4px; }
    .process-step { max-width: 220px; padding: 16px 16px; }
    .process-step .step-num { width: 36px; height: 36px; font-size: 0.95rem; }
    .process-step h4 { font-size: 0.9rem; }
    .process-step p { font-size: 0.78rem; }

    .list-item-image { height: 180px; }
    .list-item-content h3 { font-size: 1.1rem; }
    .list-item-content p { font-size: 0.88rem; }

    .contact-grid { grid-template-columns: 1fr 1fr; gap: 16px; }
    .contact-card { padding: 24px 16px; }
    .contact-card .icon { width: 44px; height: 44px; font-size: 1.3rem; }
    .contact-card h4 { font-size: 0.9rem; }
    .contact-card p { font-size: 0.85rem; }
    .contact-card .qrcode-placeholder { width: 90px; height: 90px; }

    .contact-form-wrapper { padding: 24px 16px; }
    .form-group { margin-bottom: 14px; }
    .form-group input,
    .form-group select,
    .form-group textarea { padding: 10px 14px; font-size: 0.9rem; }
    .submit-btn { padding: 12px; font-size: 0.95rem; }

    .footer-content { grid-template-columns: 1fr; gap: 20px; text-align: center; }
    .footer-brand p { font-size: 0.85rem; }
    .footer-links ul li { display: inline; margin: 0 8px; }
    .footer-contact p { font-size: 0.85rem; }
    .footer-bottom { margin-top: 24px; padding: 12px 16px; font-size: 0.78rem; }

    .carousel-arrow { width: 32px; height: 32px; font-size: 1rem; }
    .carousel-arrow.prev { left: 8px; }
    .carousel-arrow.next { right: 8px; }
    .carousel-controls { bottom: 24px; gap: 8px; }
    .carousel-dot { width: 10px; height: 10px; }

    .detail-content h2 { font-size: 1.3rem; }
    .detail-content p { font-size: 0.9rem; }
    .detail-feature-item { padding: 12px 16px; }

    .back-link { font-size: 0.85rem; }
}

/* 小手机 (<=576px) */
@media (max-width: 576px) {
    body { font-size: 14px; }

    header { height: 50px; }
    .header-inner { height: 50px; padding: 0 8px; }
    .hero-carousel { height: 280px; margin-top: 50px; }
    .page-banner { margin-top: 50px; padding: 36px 0 24px; }
    .detail-banner { margin-top: 50px; padding: 36px 0; }

    .logo { font-size: 0.85rem; gap: 4px; }
    .logo-icon { width: 24px; height: 24px; font-size: 0.7rem; border-radius: 6px; }

    nav ul { gap: 0; }
    nav ul li a {
        padding: 4px 7px;
        font-size: 0.72rem;
    }

    .lang-toggle {
        margin-left: 4px;
        padding: 3px 8px;
        font-size: 0.7rem;
        border-width: 1.5px;
    }

    .slide-content h1 { font-size: 1.2rem; }
    .slide-content p { font-size: 0.82rem; margin-bottom: 16px; }
    .slide-content .btn { padding: 8px 18px; font-size: 0.8rem; }

    .relationship-section,
    .advantages-section,
    .list-section,
    .process-section,
    .contact-info-section,
    .contact-form-section,
    .detail-section {
        padding: 36px 0;
    }

    .section-title { font-size: 1.3rem; }
    .section-subtitle { font-size: 0.85rem; margin-bottom: 24px; }
    .section-title::after { width: 40px; height: 3px; }

    .advantage-card { padding: 20px 16px; }
    .advantage-card .icon { width: 36px; height: 36px; font-size: 1.1rem; margin-bottom: 10px; }
    .advantage-card h3 { font-size: 0.95rem; }
    .advantage-card p { font-size: 0.82rem; }

    .rel-center { width: 80px; height: 80px; font-size: 0.7rem; }
    .rel-center small { font-size: 0.6rem; }
    .rel-node { width: 85px; padding: 10px 6px; }
    .rel-node .icon { font-size: 1.2rem; }
    .rel-node h4 { font-size: 0.72rem; }
    .rel-connector { font-size: 1rem; }

    .process-step { max-width: 180px; padding: 12px 12px; }
    .process-step h4 { font-size: 0.85rem; }
    .process-step p { font-size: 0.75rem; }

    .list-item-image { height: 150px; }
    .list-item-content { padding: 16px !important; }
    .list-item-content .tag { font-size: 0.72rem; padding: 2px 10px; }
    .list-item-content h3 { font-size: 1rem; }
    .list-item-content p { font-size: 0.82rem; margin-bottom: 10px; }
    .list-item-content .learn-more { font-size: 0.8rem; }

    .contact-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
    .contact-card { padding: 18px 12px; }
    .contact-card .icon { width: 40px; height: 40px; font-size: 1.1rem; margin-bottom: 10px; }
    .contact-card h4 { font-size: 0.85rem; }
    .contact-card p { font-size: 0.78rem; }
    .contact-card .qrcode-placeholder { width: 80px; height: 80px; font-size: 0.7rem; }

    .contact-form-wrapper { padding: 20px 12px; }
    .form-group label { font-size: 0.82rem; }
    .form-group input,
    .form-group select,
    .form-group textarea { padding: 8px 12px; font-size: 0.85rem; }
    .submit-btn { padding: 10px; font-size: 0.9rem; }

    .carousel-arrow { display: none; }
    .carousel-controls { bottom: 16px; gap: 6px; }
    .carousel-dot { width: 8px; height: 8px; }

    .detail-content h2 { font-size: 1.15rem; }
    .detail-content p { font-size: 0.85rem; }
    .detail-feature-item { padding: 10px 12px; gap: 8px; }
    .detail-feature-item div h4 { font-size: 0.88rem; }
    .detail-feature-item div p { font-size: 0.78rem; }

    .back-link { font-size: 0.8rem; margin-bottom: 16px; }

    .footer-content { gap: 16px; }
    .footer-brand h3 { font-size: 1rem; }
    .footer-links h4,
    .footer-contact h4 { font-size: 0.85rem; }
    .footer-bottom { font-size: 0.7rem; padding: 10px 12px; }
}

/* 极小屏 (<=400px) */
@media (max-width: 400px) {
    nav ul li a { padding: 3px 5px; font-size: 0.65rem; }
    .lang-toggle { padding: 2px 6px; font-size: 0.65rem; }
    .logo { font-size: 0.78rem; }
    .logo-icon { width: 20px; height: 20px; font-size: 0.6rem; }

    .hero-carousel { height: 240px; }
    .slide-content h1 { font-size: 1.05rem; }
    .slide-content p { font-size: 0.75rem; }

    .contact-grid { grid-template-columns: 1fr; gap: 10px; }

    .rel-node { width: 75px; padding: 8px 4px; }
    .rel-node .icon { font-size: 1rem; }
    .rel-center { width: 70px; height: 70px; font-size: 0.65rem; }
}