/* ========================================
   链智AI企业官网 - 主样式表
   主题色：蓝紫渐变科技风
   ======================================== */

/* CSS 变量 */
:root {
    --primary: #4F6EF7;
    --primary-dark: #3B54D4;
    --primary-light: #6B8AFF;
    --secondary: #7C3AED;
    --accent: #06B6D4;
    --gradient: linear-gradient(135deg, #4F6EF7 0%, #7C3AED 50%, #06B6D4 100%);
    --gradient-hover: linear-gradient(135deg, #3B54D4 0%, #6D28D9 50%, #0891B2 100%);
    --bg-dark: #0F172A;
    --bg-darker: #020617;
    --bg-light: #F8FAFC;
    --text-primary: #1E293B;
    --text-secondary: #64748B;
    --text-light: #94A3B8;
    --white: #FFFFFF;
    --border: #E2E8F0;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --transition: all 0.3s ease;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
}

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

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

body {
    font-family: var(--font-sans);
    color: var(--text-primary);
    background: var(--white);
    line-height: 1.6;
    overflow-x: hidden;
}

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

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

ul { list-style: none; }

/* ========================================
   布局容器
   ======================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 60px;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.section-header p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ========================================
   头部导航
   ======================================== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0,0,0,0.05);
    transition: var(--transition);
}

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

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 700;
    font-size: 1.25rem;
}

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

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

.nav-list {
    display: flex;
    gap: 8px;
}

.nav-item a {
    display: block;
    padding: 8px 18px;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    position: relative;
}

.nav-item a:hover,
.nav-item.active a {
    color: var(--primary);
    background: rgba(79, 110, 247, 0.08);
}

.nav-item.active a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 3px;
    background: var(--gradient);
    border-radius: 2px;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 8px;
}

.header-cta {
    padding: 10px 24px !important;
    font-size: 0.9rem !important;
}

/* 移动端菜单 */
.mobile-menu-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 1999;
    opacity: 0;
    transition: opacity 0.3s;
}

.mobile-menu-overlay.active {
    opacity: 1;
}

.mobile-menu {
    display: none;
    position: fixed;
    top: 0;
    right: -300px;
    width: 300px;
    height: 100vh;
    background: var(--white);
    z-index: 2000;
    transition: right 0.3s ease;
    padding: 80px 30px 30px;
    box-shadow: var(--shadow-xl);
}

.mobile-menu.active {
    right: 0;
}

.mobile-close-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
}

.mobile-nav-list li a {
    display: block;
    padding: 14px 0;
    font-size: 1.1rem;
    font-weight: 500;
    border-bottom: 1px solid var(--border);
    color: var(--text-primary);
}

/* ========================================
   按钮样式
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.btn-primary {
    background: var(--gradient);
    color: var(--white);
    box-shadow: 0 4px 15px rgba(79, 110, 247, 0.35);
}

.btn-primary:hover {
    background: var(--gradient-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(79, 110, 247, 0.45);
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}

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

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

.btn-white:hover {
    background: var(--bg-light);
    transform: translateY(-2px);
}

.btn-lg {
    padding: 16px 36px;
    font-size: 1.1rem;
}

/* ========================================
   Hero 首屏区域
   ======================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding-top: 72px;
    background: linear-gradient(180deg, #EEF2FF 0%, #FAFBFF 50%, #FFFFFF 100%);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 80%;
    height: 150%;
    background: radial-gradient(circle, rgba(79, 110, 247, 0.08) 0%, transparent 70%);
    animation: float 20s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-40px) rotate(5deg); }
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-content {
    max-width: 560px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    background: rgba(79, 110, 247, 0.1);
    color: var(--primary);
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 24px;
}

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

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.5); }
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.03em;
    margin-bottom: 24px;
}

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

.hero-desc {
    font-size: 1.2rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 36px;
}

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

.hero-stats {
    display: flex;
    gap: 40px;
    margin-top: 48px;
    padding-top: 32px;
    border-top: 1px solid var(--border);
}

.hero-stat h3 {
    font-size: 2rem;
    font-weight: 800;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-stat p {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-top: 4px;
}

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

.hero-image-wrapper {
    position: relative;
    width: 100%;
    max-width: 520px;
}

.hero-image-wrapper img {
    width: 100%;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
}

.hero-float-card {
    position: absolute;
    background: var(--white);
    border-radius: var(--radius-md);
    padding: 16px 20px;
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 12px;
    animation: floatCard 6s ease-in-out infinite;
}

.hero-float-card.card-1 {
    top: 15%;
    right: -30px;
    animation-delay: 0s;
}

.hero-float-card.card-2 {
    bottom: 20%;
    left: -30px;
    animation-delay: 2s;
}

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

.floating-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    flex-shrink: 0;
}

.floating-icon.blue { background: rgba(79, 110, 247, 0.1); color: var(--primary); }
.floating-icon.purple { background: rgba(124, 58, 237, 0.1); color: var(--secondary); }

.floating-text strong {
    display: block;
    font-size: 0.85rem;
    color: var(--text-primary);
}

.floating-text span {
    font-size: 0.75rem;
    color: var(--text-light);
}

/* AI平台支持展示 */
.ai-platforms {
    padding: 60px 0 40px;
    text-align: center;
}

.ai-platforms-label {
    font-size: 0.875rem;
    color: var(--text-light);
    margin-bottom: 20px;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.ai-platforms-grid {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 24px;
    flex-wrap: wrap;
    opacity: 0.7;
}

.ai-platforms-grid img {
    height: 32px;
    width: auto;
    filter: grayscale(100%);
    opacity: 0.6;
    transition: var(--transition);
}

.ai-platforms-grid img:hover {
    filter: grayscale(0%);
    opacity: 1;
}

/* ========================================
   服务板块
   ======================================== */
.services-section {
    background: var(--bg-light);
}

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

.service-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid transparent;
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: rgba(79, 110, 247, 0.1);
}

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

.service-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    background: linear-gradient(135deg, rgba(79, 110, 247, 0.1) 0%, rgba(124, 58, 237, 0.1) 100%);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
}

.service-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.service-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ========================================
   解决方案 / 流程板块
   ======================================== */
.process-section {
    position: relative;
}

.process-timeline {
    display: flex;
    justify-content: space-between;
    position: relative;
    padding-top: 60px;
}

.process-timeline::before {
    content: '';
    position: absolute;
    top: 30px;
    left: 10%;
    right: 10%;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--secondary), var(--accent));
    border-radius: 2px;
}

.process-step {
    text-align: center;
    position: relative;
    flex: 1;
    max-width: 160px;
}

.step-number {
    width: 60px;
    height: 60px;
    background: var(--gradient);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    font-weight: 700;
    margin: 0 auto 20px;
    position: relative;
    z-index: 1;
    box-shadow: 0 4px 15px rgba(79, 110, 247, 0.35);
}

.process-step h4 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.process-step p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ========================================
   关于我们板块
   ======================================== */
.about-section {
    background: var(--bg-dark);
    color: var(--white);
    position: relative;
    overflow: hidden;
}

.about-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 50%, rgba(79, 110, 247, 0.15) 0%, transparent 50%);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.about-image {
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.about-image img {
    width: 100%;
    display: block;
}

.about-content h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 24px;
    background: linear-gradient(90deg, var(--white) 0%, var(--primary-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.about-content > p {
    font-size: 1.1rem;
    color: rgba(255,255,255,0.7);
    line-height: 1.9;
    margin-bottom: 32px;
}

.about-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.about-feature {
    display: flex;
    gap: 14px;
    align-items: flex-start;
}

.feature-icon {
    width: 44px;
    height: 44px;
    background: rgba(79, 110, 247, 0.2);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.about-feature h4 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--white);
}

.about-feature p {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.55);
    line-height: 1.5;
}

/* ========================================
   新闻板块
   ======================================== */
.news-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.news-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid var(--border);
}

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

.news-card-image {
    aspect-ratio: 16/10;
    overflow: hidden;
    background: linear-gradient(135deg, #EEF2FF 0%, #EDE9FE 100%);
}

.news-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.news-card:hover .news-card-image img {
    transform: scale(1.08);
}

.news-card-body {
    padding: 24px;
}

.news-card-date {
    font-size: 0.8rem;
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 10px;
}

.news-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 10px;
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-card-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: 16px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--primary);
}

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

/* ========================================
   诊断申请板块
   ======================================== */
.diagnosis-section {
    background: var(--gradient);
    color: var(--white);
    position: relative;
    overflow: hidden;
}

.diagnosis-section::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 60%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 60%);
}

.diagnosis-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.diagnosis-content h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.diagnosis-content > p {
    font-size: 1.1rem;
    opacity: 0.9;
    line-height: 1.8;
    margin-bottom: 32px;
}

.diagnosis-features {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.diagnosis-feature {
    display: flex;
    align-items: center;
    gap: 14px;
    font-size: 1rem;
    opacity: 0.95;
}

.diagnosis-feature .check {
    width: 26px;
    height: 26px;
    background: rgba(255,255,255,0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 0.85rem;
}

/* 诊断维度卡片 */
.diag-dimensions {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 24px;
}

.diag-dim-card {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 18px;
    background: linear-gradient(135deg, rgba(79,110,247,0.06), rgba(124,58,237,0.06));
    border-radius: var(--radius-md);
    border: 1px solid rgba(79,110,247,0.1);
    transition: all 0.25s ease;
}
.diag-dim-card:hover {
    background: linear-gradient(135deg, rgba(79,110,247,0.12), rgba(124,58,237,0.12));
    border-color: rgba(79,110,247,0.25);
    transform: translateX(4px);
}

.dim-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary), #7C3AED);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.15rem;
    flex-shrink: 0;
}

.dim-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
}
.dim-info strong {
    font-size: 0.95rem;
    color: var(--text-primary);
}
.dim-info span {
    font-size: 0.82rem;
    color: var(--text-secondary);
}

/* 数据统计行 */
.diag-stats-row {
    display: flex;
    gap: 16px;
    padding: 20px 0;
    border-top: 1px solid rgba(0,0,0,0.06);
    border-bottom: 1px solid rgba(0,0,0,0.06);
}

.diag-stat {
    flex: 1;
    text-align: center;
    padding: 8px 4px;
}
.diag-stat strong {
    display: block;
    font-size: 1.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), #7C3AED);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.3;
}
.diag-stat span {
    font-size: 0.78rem;
    color: var(--text-secondary);
    margin-top: 2px;
    display: block;
}

/* 表单样式 */
.diagnosis-form {
    background: var(--white);
    border-radius: var(--radius-xl);
    padding: 40px;
    box-shadow: var(--shadow-xl);
}

.diagnosis-form h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 24px;
    text-align: center;
}

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

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 14px 18px;
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: inherit;
    color: var(--text-primary);
    transition: var(--transition);
    background: var(--white);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(79, 110, 247, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.form-submit {
    width: 100%;
    padding: 16px;
    font-size: 1.05rem;
}

.form-success {
    display: none;
    text-align: center;
    padding: 40px 20px;
}

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

.form-success .success-icon {
    width: 72px;
    height: 72px;
    background: rgba(34, 197, 94, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 2rem;
    color: #22C55E;
}

.form-success h3 {
    font-size: 1.4rem;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.form-success p {
    color: var(--text-secondary);
}

/* ========================================
   底部区域
   ======================================== */
.site-footer {
    background: var(--bg-darker);
    color: rgba(255,255,255,0.7);
    padding: 80px 0 0;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1.2fr 1fr;
    gap: 48px;
    padding-bottom: 48px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-logo {
    height: 40px;
    margin-bottom: 16px;
}

.footer-brand h3 {
    font-size: 1.1rem;
    color: var(--white);
    margin-bottom: 12px;
}

.footer-desc {
    font-size: 0.9rem;
    line-height: 1.7;
    opacity: 0.65;
}

.footer-col h4 {
    font-size: 1rem;
    color: var(--white);
    margin-bottom: 20px;
    font-weight: 600;
}

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

.footer-links a {
    font-size: 0.9rem;
    opacity: 0.65;
    transition: var(--transition);
}

.footer-links a:hover {
    opacity: 1;
    color: var(--primary-light);
}

.footer-contact li {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.9rem;
    margin-bottom: 12px;
    opacity: 0.65;
}

.footer-qrcode img {
    width: 140px;
    height: 140px;
    border-radius: var(--radius-md);
    border: 3px solid rgba(255,255,255,0.1);
}

.qrcode-placeholder {
    width: 140px;
    height: 140px;
    background: rgba(255,255,255,0.05);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    color: rgba(255,255,255,0.3);
    text-align: center;
    border: 2px dashed rgba(255,255,255,0.1);
}

.footer-qrcode p {
    font-size: 0.8rem;
    margin-top: 12px;
    opacity: 0.5;
    text-align: center;
}

.footer-bottom {
    padding: 24px 0;
    text-align: center;
    font-size: 0.85rem;
    opacity: 0.45;
}

.footer-bottom a {
    color: inherit;
}

.footer-bottom a:hover {
    opacity: 0.8;
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    background: var(--gradient);
    color: var(--white);
    border: none;
    border-radius: 50%;
    font-size: 1.2rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    box-shadow: var(--shadow-lg);
    z-index: 999;
}

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

.back-to-top:hover {
    transform: translateY(-4px);
}

/* ========================================
   页面内标题横幅（深色高级感，与 GEO 解决方案页统一）
   ======================================== */
.page-banner {
    padding: 158px 0 96px;
    background: radial-gradient(110% 130% at 50% -10%, #25306b 0%, #141d44 45%, #0b1024 100%);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.page-banner::after { display: none; }

.banner-eyebrow {
    display: inline-block;
    font-size: .76rem;
    font-weight: 700;
    letter-spacing: .3em;
    text-transform: uppercase;
    color: #A9B8FF;
    background: rgba(169, 184, 255, .1);
    border: 1px solid rgba(169, 184, 255, .28);
    padding: 8px 20px;
    border-radius: 999px;
    margin-bottom: 26px;
}

.page-banner h1 {
    color: #fff;
    font-size: 3.3rem;
    font-weight: 800;
    letter-spacing: -.02em;
    background: linear-gradient(135deg, #E0E7FF 0%, #C7D2FE 38%, #E9D5FF 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 18px;
}

.page-banner p {
    color: #C5CFE6;
    font-size: 1.18rem;
    max-width: 620px;
    line-height: 1.8;
    margin: 0 auto;
}

@media (max-width: 768px) {
    .page-banner { padding: 120px 0 70px; }
    .page-banner h1 { font-size: 2.2rem; }
}

/* ========================================
   地图区域（高德地图容器）
   ======================================== */
.map-section { background: var(--bg-light); padding: 80px 0; }
.map-section .section-head { text-align: center; margin-bottom: 36px; }
.map-section .eyebrow {
    display: inline-block; font-size: .76rem; font-weight: 700; letter-spacing: .3em;
    text-transform: uppercase; color: var(--primary); background: rgba(79,110,247,.1);
    padding: 7px 18px; border-radius: 999px; margin-bottom: 18px;
}
.map-section h2 { font-size: 2rem; font-weight: 800; color: var(--text-dark); margin-bottom: 12px; }
.map-section .section-head p { color: var(--text-secondary); font-size: 1rem; }
.map-box {
    height: 460px; border-radius: var(--radius-lg); overflow: hidden;
    box-shadow: var(--shadow-lg); background: #eef2ff; position: relative;
}
.map-placeholder {
    position: absolute; inset: 0; display: flex; flex-direction: column;
    align-items: center; justify-content: center; color: var(--text-light); text-align: center; padding: 24px;
}
.map-placeholder .mp-icon { font-size: 2.4rem; margin-bottom: 12px; }
.map-placeholder .mp-tip { font-size: .85rem; margin-top: 10px; color: var(--text-light); }
@media (max-width: 768px) {
    .map-section { padding: 56px 0; }
    .map-box { height: 320px; }
    .map-section h2 { font-size: 1.6rem; }
}

/* ========================================
   新闻详情页
   ======================================== */
.article-header {
    max-width: 800px;
    margin: 0 auto;
    padding: 60px 24px 40px;
    text-align: center;
}

.article-meta {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 24px;
    font-size: 0.9rem;
    color: var(--text-light);
}

.article-title {
    font-size: 2.2rem;
    font-weight: 800;
    line-height: 1.3;
    margin-bottom: 20px;
}

.article-body {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 24px 80px;
    font-size: 1.1rem;
    line-height: 2;
    color: var(--text-primary);
}

.article-body p {
    margin-bottom: 24px;
}

.article-body img {
    border-radius: var(--radius-md);
    margin: 32px 0;
}

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

.contact-info-cards {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.contact-info-card {
    display: flex;
    gap: 18px;
    padding: 24px;
    background: var(--bg-light);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.contact-info-card:hover {
    background: var(--white);
    box-shadow: var(--shadow-md);
}

.contact-icon {
    width: 52px;
    height: 52px;
    background: var(--gradient);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    flex-shrink: 0;
    color: var(--white);
}

.contact-info-card h4 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.contact-info-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* ========================================
   研究院/CTA 板块
   ======================================== */
.cta-section {
    background: var(--bg-dark);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at center, rgba(79, 110, 247, 0.2) 0%, transparent 70%);
}

.cta-content {
    position: relative;
    z-index: 1;
}

.cta-section h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 16px;
}

.cta-section p {
    font-size: 1.15rem;
    color: rgba(255,255,255,0.7);
    margin-bottom: 32px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* ========================================
   数据统计条
   ======================================== */
.stats-bar {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    padding: 60px 0;
}

.stat-item {
    text-align: center;
    padding: 30px 20px;
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.stat-number {
    font-size: 2.8rem;
    font-weight: 800;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

.stat-label {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-top: 8px;
}

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .hero-content { max-width: 100%; }
    .hero-actions { justify-content: center; }
    .hero-stats { justify-content: center; }
    .hero-visual { display: none; }

    .services-grid { grid-template-columns: repeat(2, 1fr); }
    .news-grid { grid-template-columns: repeat(2, 1fr); }
    .about-grid { grid-template-columns: 1fr; gap: 48px; }
    .diagnosis-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .stats-bar { grid-template-columns: repeat(2, 1fr); }
    .contact-grid { grid-template-columns: 1fr; }
    .process-timeline { flex-wrap: wrap; gap: 30px; justify-content: center; }
    .process-timeline::before { display: none; }
}

@media (max-width: 768px) {
    .section { padding: 60px 0; }
    .section-header h2 { font-size: 2rem; }
    .hero h1 { font-size: 2.5rem; }
    .page-banner h1 { font-size: 2.2rem; }
    .services-grid { grid-template-columns: 1fr; }
    .news-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
    .stats-bar { grid-template-columns: 1fr 1fr; }
    .about-features { grid-template-columns: 1fr; }
    .nav-list { display: none; }
    .mobile-menu-btn { display: block; }
    .mobile-menu { display: block; }
    .mobile-menu-overlay { display: block; }
    .header-cta { display: none; }
    .diagnosis-form { padding: 28px 20px; }
    .hero-stats { flex-direction: column; gap: 20px; align-items: center; }
}

@media (max-width: 480px) {
    .hero h1 { font-size: 2rem; }
    .section-header h2 { font-size: 1.6rem; }
    .btn-lg { padding: 14px 28px; font-size: 1rem; }
    .stat-number { font-size: 2.2rem; }
}

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

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

/* ========================================
   GEO 解决方案卡片（首页/解决方案页共享）
   ======================================== */
.geo-solutions-section { padding: 80px 0; background: var(--white); }
.geo-solutions-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.geo-sol-card {
    border: 1px solid var(--border); border-radius: var(--radius-lg);
    overflow: hidden; transition: all .35s ease; background: var(--white);
    display: flex; flex-direction: column;
}
.geo-sol-card:hover {
    transform: translateY(-8px); box-shadow: var(--shadow-xl); border-color: transparent;
}
.geo-sol-img {
    height: 200px; overflow: hidden; position: relative;
    background: linear-gradient(135deg, #EEF2FF, #DBEAFE);
    display: flex; align-items: center; justify-content: center;
}
.geo-sol-img img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s ease; }
.geo-sol-card:hover .geo-sol-img img { transform: scale(1.06); }
.geo-sol-body { padding: 24px 22px 26px; display: flex; flex-direction: column; flex: 1; }
.geo-sol-tag {
    display: inline-flex; align-items: center; gap: 6px;
    font-size: .72rem; font-weight: 700; color: var(--primary);
    background: rgba(79,110,247,.1); padding: 4px 12px; border-radius: 999px;
    margin-bottom: 12px; align-self: flex-start;
}
.geo-sol-body h3 {
    font-size: 1.18rem; font-weight: 800; color: var(--text-primary);
    margin-bottom: 10px; padding-bottom: 12px;
    border-bottom: 2px solid rgba(79,110,247,.15);
}
.geo-sol-body p { font-size: .92rem; color: var(--text-secondary); line-height: 1.8; }
.geo-sol-points { list-style: none; padding: 0; margin: 16px 0 0; }
.geo-sol-points li {
    font-size: .85rem; color: var(--text-secondary); line-height: 1.6;
    padding: 6px 0 6px 22px; position: relative;
}
.geo-sol-points li::before {
    content: "¹3"; position: absolute; left: 0; top: 6px;
    color: var(--primary); font-weight: 700;
}
.geo-sol-more {
    margin-top: auto; padding-top: 18px; font-size: .88rem; font-weight: 700;
    color: var(--primary); text-decoration: none; transition: gap .25s ease; display: inline-flex; gap: 6px;
}
.geo-sol-more:hover { color: var(--primary-dark); gap: 10px; }

/* 解决方案页：价值亮点条 */
.sol-feature-bar { padding: 60px 0; background: var(--bg-light); }
.sol-feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.sol-feature {
    text-align: center; padding: 28px 18px; background: var(--white);
    border-radius: var(--radius-lg); border: 1px solid var(--border); transition: all .3s ease;
}
.sol-feature:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.sol-feature-icon {
    width: 54px; height: 54px; margin: 0 auto 14px; border-radius: 14px;
    display: flex; align-items: center; justify-content: center; font-size: 1.6rem;
    background: linear-gradient(135deg, rgba(79,110,247,.12), rgba(124,58,237,.12));
}
.sol-feature h4 { font-size: 1rem; font-weight: 700; color: var(--text-primary); margin-bottom: 6px; }
.sol-feature p { font-size: .82rem; color: var(--text-secondary); line-height: 1.6; }

.geo-cta-red {
    display: inline-flex; align-items: center; gap: 8px; background: #E53935; color: #fff;
    padding: 16px 36px; border-radius: 999px; font-weight: 700; font-size: 1.05rem;
    text-decoration: none; box-shadow: 0 6px 20px rgba(229,57,53,.35); transition: all .3s ease;
}
.geo-cta-red:hover { background: #C62828; transform: translateY(-2px); box-shadow: 0 10px 28px rgba(229,57,53,.45); }

@media (max-width: 1024px) { .geo-solutions-grid { grid-template-columns: repeat(2, 1fr); } .sol-feature-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 900px) { .geo-solutions-grid { grid-template-columns: 1fr; max-width: 480px; margin: 0 auto; } }
@media (max-width: 600px) { .sol-feature-grid { grid-template-columns: 1fr; } }