/* ============================================
   为你省机器人官网 v2.0
   主题：商务深蓝灰 Business
   ============================================ */

/* ===== CSS变量 ===== */
:root {
    /* 主色系 - 深蓝灰 */
    --primary: #1e3a5f;
    --primary-dark: #0f2744;
    --primary-light: #3d5a80;
    --primary-lightest: #eef2f7;
    
    /* 强调色 - 质感金 */
    --accent: #c9a962;
    --accent-light: #d4b97a;
    --accent-dark: #a88b4a;
    --accent-lightest: #f5ecd7;
    
    /* 中性色 - 高级灰 */
    --gray-900: #1a202c;
    --gray-800: #2d3748;
    --gray-700: #4a5568;
    --gray-600: #718096;
    --gray-500: #a0aec0;
    --gray-400: #cbd5e0;
    --gray-300: #e2e8f0;
    --gray-200: #edf2f7;
    --gray-100: #f7fafc;
    --gray-50: #fafbfc;
    
    /* 文字色 */
    --text-primary: #1a202c;
    --text-secondary: #4a5568;
    --text-muted: #718096;
    
    /* 背景色 */
    --bg-white: #ffffff;
    --bg-gray: #f7fafc;
    --bg-dark: #0f2744;
    
    /* 边框色 */
    --border-color: #e2e8f0;
    --border-light: #edf2f7;
    
    /* 圆角 */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* 阴影 */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 60px rgba(0,0,0,0.12);
    
    /* 过渡 */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== 全局重置 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    color: var(--text-primary);
    background: var(--bg-white);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

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

ul {
    list-style: none;
}

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

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

.section {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 50px;
}

.section-tag {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(201, 169, 98, 0.1);
    color: var(--accent);
    border: 1px solid rgba(201, 169, 98, 0.2);
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 16px;
    letter-spacing: 0.5px;
}

.section-title {
    font-size: 36px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.section-desc {
    font-size: 16px;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto;
}

/* ===== 按钮 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    text-decoration: none;
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 14px rgba(30, 58, 95, 0.25);
}

.btn-primary::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(201, 169, 98, 0.25), transparent);
    transition: left 0.6s ease;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(30, 58, 95, 0.35);
}

.btn-primary:hover::after {
    left: 100%;
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 1.5px solid var(--border-color);
}

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

.btn-large {
    padding: 16px 36px;
    font-size: 16px;
}

.btn-small {
    padding: 8px 18px;
    font-size: 13px;
}

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    transition: var(--transition);
    border-bottom: 1px solid transparent;
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    border-bottom-color: var(--border-color);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 32px;
    height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 18px;
    font-weight: 700;
    color: var(--gray-900);
}

.logo-icon {
    font-size: 24px;
    color: var(--primary);
}

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

.nav-link {
    padding: 8px 16px;
    font-size: 14px;
    color: var(--text-secondary);
    border-radius: 8px;
    transition: var(--transition);
    font-weight: 500;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary);
    background: var(--primary-lightest);
}

.nav-ai {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white !important;
    padding: 8px 18px !important;
    margin-left: 8px;
}

.nav-ai:hover {
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    color: white !important;
}

.ai-badge {
    display: inline-block;
    background: var(--accent);
    color: white;
    font-size: 10px;
    padding: 2px 6px;
    border-radius: 4px;
    font-weight: 600;
    margin-right: 4px;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 8px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--gray-700);
    border-radius: 2px;
    transition: var(--transition);
}

/* ===== Hero 区域 ===== */
.hero {
    padding: 140px 0 100px;
    background: linear-gradient(180deg, #f0f4f8 0%, #ffffff 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(rgba(30, 58, 95, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(30, 58, 95, 0.03) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    top: -200px;
    right: -200px;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(30, 58, 95, 0.06) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.hero-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 32px;
    display: grid;
    grid-template-columns: 1.1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 18px;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 30px;
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 24px;
    box-shadow: var(--shadow-sm);
}

.hero-badge::before {
    content: '';
    width: 6px;
    height: 6px;
    background: #22c55e;
    border-radius: 50%;
    animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.4); }
    50% { opacity: 0.8; box-shadow: 0 0 0 8px rgba(34, 197, 94, 0); }
}

.hero-title {
    font-size: 52px;
    font-weight: 800;
    line-height: 1.15;
    color: var(--gray-900);
    margin-bottom: 20px;
    letter-spacing: -1px;
}

.hero-title .highlight {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-desc {
    font-size: 17px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 32px;
    max-width: 540px;
}

.hero-btns {
    display: flex;
    gap: 16px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

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

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

.hero-stat-num {
    font-size: 32px;
    font-weight: 700;
    color: var(--primary);
    line-height: 1;
    margin-bottom: 6px;
}

.hero-stat-num .unit {
    font-size: 18px;
    font-weight: 600;
    margin-left: 2px;
}

.hero-stat-label {
    font-size: 13px;
    color: var(--text-muted);
}

.hero-image-wrap {
    position: relative;
}

.hero-image {
    width: 100%;
    aspect-ratio: 4/3;
    background: linear-gradient(135deg, #1e3a5f 0%, #0f2744 100%);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 120px;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.hero-image::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
    background-size: 30px 30px;
}

.hero-image-icon {
    position: relative;
    z-index: 1;
    filter: drop-shadow(0 8px 32px rgba(0,0,0,0.3));
    animation: float 4s ease-in-out infinite;
}

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

.hero-image-badge {
    position: absolute;
    background: white;
    padding: 12px 18px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    font-size: 13px;
    font-weight: 500;
    z-index: 2;
    display: flex;
    align-items: center;
    gap: 8px;
}

.hero-image-badge.b1 {
    top: 30px;
    left: -20px;
    animation: float 3s ease-in-out infinite;
}

.hero-image-badge.b2 {
    bottom: 40px;
    right: -10px;
    animation: float 3.5s ease-in-out infinite 0.5s;
}

.hero-image-badge.b3 {
    top: 50%;
    right: -25px;
    animation: float 4s ease-in-out infinite 1s;
}

/* ===== 产品展示 ===== */
.products-section {
    background: white;
}

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

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

.product-card:hover {
    transform: translateY(-6px);
    border-color: var(--accent);
    box-shadow: 0 20px 50px rgba(30, 58, 95, 0.12);
}

.product-card-image {
    height: 200px;
    background: linear-gradient(135deg, var(--primary-lightest) 0%, white 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 64px;
    position: relative;
    overflow: hidden;
}

.product-card-image::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(rgba(30, 58, 95, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(30, 58, 95, 0.03) 1px, transparent 1px);
    background-size: 24px 24px;
}

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

.product-category {
    display: inline-block;
    font-size: 12px;
    color: var(--accent);
    background: var(--accent-lightest);
    padding: 4px 10px;
    border-radius: 4px;
    margin-bottom: 12px;
    font-weight: 500;
}

.product-card-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 8px;
}

.product-card-desc {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 16px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.product-card-features {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 16px;
}

.product-feature-tag {
    font-size: 12px;
    padding: 3px 10px;
    background: var(--gray-100);
    color: var(--text-secondary);
    border-radius: 4px;
}

.product-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 16px;
    border-top: 1px solid var(--border-light);
}

.product-card-model {
    font-size: 13px;
    color: var(--text-muted);
}

.product-card-link {
    font-size: 14px;
    color: var(--primary);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 4px;
}

.product-card:hover .product-card-link {
    gap: 8px;
}

/* ===== 行业方案 ===== */
.solutions-section {
    background: var(--gray-100);
}

.solutions-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.solution-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    cursor: pointer;
}

.solution-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent);
    box-shadow: var(--shadow-lg);
}

.solution-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 16px;
    background: linear-gradient(135deg, var(--primary-lightest), white);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    transition: var(--transition);
}

.solution-card:hover .solution-icon {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    transform: scale(1.1);
}

.solution-card:hover .solution-icon span {
    filter: brightness(0) invert(1);
}

.solution-card h3 {
    font-size: 17px;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 8px;
}

.solution-card p {
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.6;
}

/* ===== 核心优势 ===== */
.advantages-section {
    background: white;
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.advantage-card {
    text-align: center;
    padding: 40px 32px;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    transition: var(--transition);
}

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

.advantage-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto 20px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    box-shadow: 0 8px 24px rgba(30, 58, 95, 0.2);
}

.advantage-card h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 12px;
}

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

/* ===== 合作伙伴 ===== */
.partners-section {
    background: var(--gray-100);
}

.partners-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 20px;
}

.partner-item {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 24px 16px;
    text-align: center;
    transition: var(--transition);
}

.partner-item:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.partner-logo {
    font-size: 32px;
    margin-bottom: 8px;
}

.partner-name {
    font-size: 14px;
    font-weight: 500;
    color: var(--gray-800);
    margin-bottom: 4px;
}

.partner-industry {
    font-size: 12px;
    color: var(--text-muted);
}

/* ===== CTA 区块 ===== */
.cta-section {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    padding: 80px 0;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
    background-size: 40px 40px;
}

.cta-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    text-align: center;
    position: relative;
    z-index: 1;
}

.cta-content h2 {
    font-size: 36px;
    font-weight: 700;
    color: white;
    margin-bottom: 16px;
}

.cta-content p {
    font-size: 17px;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 32px;
}

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

.cta-section .btn-primary {
    background: var(--accent);
    color: var(--primary-dark);
    font-weight: 600;
    box-shadow: 0 4px 16px rgba(201, 169, 98, 0.3);
}

.cta-section .btn-primary:hover {
    background: var(--accent-light);
    box-shadow: 0 8px 24px rgba(201, 169, 98, 0.4);
}

.cta-section .btn-outline {
    border-color: rgba(255, 255, 255, 0.3);
    color: white;
}

.cta-section .btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.5);
}

/* ===== 页脚 ===== */
.footer {
    background: #0a1628;
    color: rgba(255, 255, 255, 0.7);
    padding: 60px 0 0;
}

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

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr 1.2fr;
    gap: 40px;
    padding-bottom: 40px;
}

.footer-col h3 {
    color: white;
    font-size: 18px;
    margin-bottom: 16px;
    font-weight: 600;
}

.footer-col h4 {
    color: white;
    font-size: 15px;
    margin-bottom: 16px;
    font-weight: 600;
}

.footer-desc {
    font-size: 14px;
    line-height: 1.7;
    color: rgba(255, 255, 255, 0.6);
}

.footer-col ul li {
    margin-bottom: 10px;
}

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

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

.contact-list li {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 12px;
    display: flex;
    align-items: flex-start;
    gap: 8px;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding: 20px 0;
    text-align: center;
    font-size: 13px;
    color: rgba(255, 255, 255, 0.4);
    background: #071020;
}

/* ===== 移动端底部CTA ===== */
.mobile-bottom-cta {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: white;
    border-top: 1px solid var(--border-color);
    padding: 8px 12px;
    z-index: 999;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.05);
}

.mobile-cta-btn {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    padding: 6px 8px;
    font-size: 11px;
    color: var(--text-secondary);
    text-decoration: none;
    border: none;
    background: none;
    cursor: pointer;
}

.mobile-cta-icon {
    font-size: 20px;
}

.mobile-cta-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    border-radius: 8px;
    padding: 8px 12px;
}

/* ===== 回到顶部 ===== */
.back-to-top {
    position: fixed;
    bottom: 80px;
    right: 24px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    border: none;
    cursor: pointer;
    font-size: 18px;
    box-shadow: 0 4px 16px rgba(30, 58, 95, 0.3);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: var(--transition);
    z-index: 998;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* ===== 悬浮AI按钮 ===== */
.float-ai-btn {
    position: fixed;
    bottom: 140px;
    right: 24px;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: white;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    box-shadow: 0 4px 20px rgba(30, 58, 95, 0.3);
    z-index: 997;
    transition: var(--transition);
}

.float-ai-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 28px rgba(30, 58, 95, 0.4);
}

.float-ai-icon {
    font-size: 24px;
}

.float-ai-text {
    font-size: 10px;
    margin-top: 2px;
}

/* ===== 选型指南CTA ===== */
.selection-guide-cta {
    margin: 0 auto 80px;
    max-width: 1200px;
    padding: 0 24px;
}

.selection-guide-inner {
    background: linear-gradient(135deg, #eef2f7 0%, #dce3eb 50%, #f5ecd7 100%);
    border-radius: var(--radius-xl);
    padding: 50px 40px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.selection-guide-inner::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(30, 58, 95, 0.08) 0%, transparent 70%);
    border-radius: 50%;
}

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

.selection-cta-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.selection-cta-content h3 {
    font-size: 28px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 12px;
}

.selection-cta-content p {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 30px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

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

.selection-cta-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    background: white;
    border-radius: var(--radius-md);
    color: var(--gray-700);
    text-decoration: none;
    font-weight: 500;
    font-size: 14px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.selection-cta-link:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    color: var(--primary);
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }
    
    .hero-desc {
        margin-left: auto;
        margin-right: auto;
    }
    
    .hero-btns {
        justify-content: center;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .hero-image-wrap {
        max-width: 500px;
        margin: 0 auto;
    }
    
    .products-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .solutions-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .partners-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .section {
        padding: 50px 0;
    }
    
    .section-title {
        font-size: 26px;
    }
    
    .nav-menu {
        display: none;
        position: absolute;
        top: 68px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 16px;
        box-shadow: var(--shadow-md);
        gap: 4px;
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero {
        padding: 100px 0 60px;
    }
    
    .hero-title {
        font-size: 34px;
    }
    
    .hero-desc {
        font-size: 15px;
    }
    
    .hero-stats {
        gap: 24px;
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .hero-stat-num {
        font-size: 26px;
    }
    
    .products-grid {
        grid-template-columns: 1fr;
    }
    
    .solutions-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }
    
    .advantages-grid {
        grid-template-columns: 1fr;
    }
    
    .partners-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 24px;
    }
    
    .cta-content h2 {
        font-size: 26px;
    }
    
    .selection-guide-inner {
        padding: 30px 20px;
    }
    
    .selection-cta-content h3 {
        font-size: 22px;
    }
    
    .selection-cta-links {
        flex-direction: column;
        align-items: center;
    }
    
    .selection-cta-link {
        width: 100%;
        max-width: 280px;
        justify-content: center;
    }
    
    .mobile-bottom-cta {
        display: flex;
        align-items: center;
        gap: 4px;
    }
    
    .float-ai-btn {
        bottom: 80px;
    }
    
    .back-to-top {
        bottom: 80px;
    }
    
    body {
        padding-bottom: 60px;
    }
}

@media (max-width: 480px) {
    .solutions-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .partners-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
}