:root {
    --bg: #f8fafc;
    --surface: #ffffff;
    --border: #e2e8f0;
    --border-light: #f1f5f9;
    --text: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --primary: #2563eb;
    --primary-light: #3b82f6;
    --primary-soft: #eff6ff;
    --primary-gradient: linear-gradient(135deg, #2563eb, #3b82f6);
    --accent: #0ea5e9;
    --green: #10b981;
    --green-soft: #ecfdf5;
    --orange: #f59e0b;
    --baidu: #de2910;
    --baidu-soft: #fef2f2;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.03);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.04), 0 2px 4px -2px rgba(0, 0, 0, 0.03);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.06), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
    --radius: 16px;
    --radius-sm: 10px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

/* ========== 导航栏 ========== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    transition: var(--transition);
}
.header.scrolled {
    box-shadow: var(--shadow-md);
}
.header-inner {
    max-width: 1280px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
    padding: 0 24px;
}
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--text);
    letter-spacing: -0.5px;
    flex-shrink: 0;
}
.logo-icon {
    width: 36px;
    height: 36px;
    background: var(--primary-gradient);
    border-radius: 10px;
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 0.95rem;
}
.nav-links {
    display: flex;
    align-items: center;
    list-style: none;
    gap: 2px;
    flex-wrap: wrap;
}
.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    padding: 8px 14px;
    border-radius: 8px;
    font-size: 0.88rem;
    transition: var(--transition);
    white-space: nowrap;
}
.nav-links a:hover {
    background: var(--primary-soft);
    color: var(--primary);
}
.nav-cta {
    background: var(--primary) !important;
    color: #fff !important;
    padding: 9px 20px !important;
    border-radius: 30px !important;
    font-weight: 600 !important;
    margin-left: 4px;
}
.nav-cta:hover {
    background: #1d4ed8 !important;
    color: #fff !important;
}

/* ========== 汉堡菜单 ========== */
.hamburger {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    z-index: 1001;
}
.hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text);
    margin: 5px 0;
    border-radius: 2px;
    transition: var(--transition);
}
.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}
.hamburger.active span:nth-child(2) {
    opacity: 0;
}
.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ========== 移动端导航 ========== */
.mobile-nav {
    display: none;
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    padding: 16px 24px;
    z-index: 999;
    flex-direction: column;
    gap: 4px;
}
.mobile-nav.open {
    display: flex;
}
.mobile-nav a {
    display: block;
    padding: 12px 16px;
    text-decoration: none;
    color: var(--text);
    font-weight: 500;
    border-radius: 8px;
    transition: var(--transition);
}
.mobile-nav a:hover {
    background: var(--primary-soft);
    color: var(--primary);
}
.mobile-nav .nav-cta-mobile {
    background: var(--primary);
    color: #fff !important;
    text-align: center;
    border-radius: 30px;
    margin-top: 8px;
    font-weight: 600;
}

/* ========== 通用区块 ========== */
.section {
    padding: 80px 24px;
    position: relative;
}
.section-white {
    background: #ffffff;
}
.section-gray {
    background: #f8fafc;
}
.section-blue {
    background: #f0f4ff;
}
.section-dark {
    background: #0f172a;
    color: #fff;
}
.section-divider {
    height: 1px;
    background: var(--border);
    margin: 0 24px;
    opacity: 0.6;
}
.container {
    max-width: 1240px;
    margin: 0 auto;
}
.section-header {
    text-align: center;
    margin-bottom: 56px;
}
.section-label {
    display: inline-block;
    background: var(--primary-soft);
    color: var(--primary);
    padding: 5px 16px;
    border-radius: 30px;
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.6px;
    text-transform: uppercase;
    margin-bottom: 14px;
}
.section-header h2 {
    font-size: clamp(1.8rem, 3.5vw, 2.4rem);
    font-weight: 700;
    letter-spacing: -0.5px;
    margin-bottom: 10px;
    color: #0f172a;
}
.section-dark .section-header h2 {
    color: #fff;
}
.section-header p {
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    font-size: 1rem;
}
.section-dark .section-header p {
    color: #cbd5e1;
}

/* ========== Hero ========== */
.hero {
    padding: 140px 24px 90px;
    text-align: center;
    background: linear-gradient(180deg, #eff6ff 0%, #f8fafc 100%);
    position: relative;
    overflow: hidden;
}
.hero::before {
    content: '';
    position: absolute;
    top: -200px;
    right: -100px;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.06) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 30px;
    padding: 6px 20px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    box-shadow: var(--shadow-sm);
    margin-bottom: 28px;
    position: relative;
    z-index: 1;
}
.hero-badge .dot {
    width: 8px;
    height: 8px;
    background: var(--green);
    border-radius: 50%;
    animation: pulse-dot 2s infinite;
}
@keyframes pulse-dot {
    0%,
    100% {
        box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.4);
    }
    50% {
        box-shadow: 0 0 0 10px rgba(16, 185, 129, 0);
    }
}
.hero h1 {
    font-size: clamp(2.4rem, 5vw, 3.6rem);
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -1.5px;
    margin-bottom: 20px;
    color: #0f172a;
    position: relative;
    z-index: 1;
}
.hero h1 .gradient-text {
    background: linear-gradient(135deg, #2563eb, #0ea5e9);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero h1 .baidu-text {
    color: #de2910;
}
.hero-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 680px;
    margin: 0 auto 36px;
    line-height: 1.8;
    position: relative;
    z-index: 1;
}
.hero-buttons {
    display: flex;
    gap: 14px;
    justify-content: center;
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}

/* ========== 按钮 ========== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 15px 30px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.93rem;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    white-space: nowrap;
}
.btn-primary {
    background: var(--primary-gradient);
    color: #fff;
    box-shadow: 0 8px 24px rgba(37, 99, 235, 0.25);
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 32px rgba(37, 99, 235, 0.35);
}
.btn-outline {
    background: #fff;
    color: var(--text);
    border: 1.5px solid var(--border);
    box-shadow: var(--shadow-sm);
}
.btn-outline:hover {
    border-color: var(--primary);
    background: var(--primary-soft);
    color: var(--primary);
}
.btn-block {
    width: 100%;
    justify-content: center;
}

/* ========== 服务卡片 ========== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}
.service-card {
    background: #fff;
    border-radius: var(--radius);
    padding: 32px 28px;
    border: 1px solid var(--border);
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
    position: relative;
}
.service-card:hover {
    border-color: #93c5fd;
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}
.service-icon {
    width: 50px;
    height: 50px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 16px;
    background: var(--primary-soft);
}
.service-icon.baidu {
    background: #fef2f2;
    color: #de2910;
}
.service-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 6px;
    color: #0f172a;
}
.service-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
}
.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 14px;
}
.tag {
    background: #f1f5f9;
    padding: 4px 10px;
    border-radius: 16px;
    font-size: 0.72rem;
    color: #64748b;
    font-weight: 500;
}

/* ========== 优势区域 ========== */
.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 16px;
}
.advantage-item {
    background: #fff;
    border-radius: var(--radius-sm);
    padding: 24px 20px;
    border: 1px solid var(--border);
    display: flex;
    gap: 14px;
    align-items: flex-start;
    transition: var(--transition);
}
.advantage-item:hover {
    border-color: #93c5fd;
    box-shadow: var(--shadow);
}
.advantage-icon {
    font-size: 1.4rem;
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    background: var(--primary-soft);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.advantage-text h4 {
    font-size: 0.95rem;
    font-weight: 700;
    color: #0f172a;
    margin-bottom: 2px;
}
.advantage-text p {
    font-size: 0.83rem;
    color: var(--text-secondary);
}

/* ========== 案例卡片 ========== */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}
.case-card {
    background: #fff;
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--border);
    transition: var(--transition);
}
.case-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-3px);
}
.case-image {
    width: 100%;
    height: 180px;
    overflow: hidden;
    position: relative;
    background: #f1f5f9;
}
.case-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.4s ease;
}
.case-card:hover .case-image img {
    transform: scale(1.05);
}
.case-body {
    padding: 22px 24px;
}
.case-body h3 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 4px;
}
.case-meta {
    font-size: 0.82rem;
    color: var(--text-muted);
    margin-bottom: 10px;
}
.case-stats {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
}
.case-stat {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--green);
    background: var(--green-soft);
    padding: 4px 12px;
    border-radius: 16px;
}

/* ========== 服务流程 ========== */
.process-steps {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
}
.process-step {
    flex: 1;
    min-width: 140px;
    text-align: center;
    padding: 24px 14px;
    background: #fff;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    transition: var(--transition);
}
.process-step:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow);
}
.process-num {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--primary-soft);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 10px;
    font-weight: 700;
    color: var(--primary);
    font-size: 1.1rem;
}
.process-step h4 {
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 2px;
}
.process-step p {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* ========== 价格方案 ========== */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}
.pricing-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px 26px;
    text-align: center;
    transition: var(--transition);
    position: relative;
}
.pricing-card.featured {
    border-color: var(--primary);
    box-shadow: var(--shadow-lg);
    transform: scale(1.02);
}
.pricing-badge {
    display: inline-block;
    background: var(--primary);
    color: #fff;
    padding: 4px 14px;
    border-radius: 20px;
    font-size: 0.72rem;
    font-weight: 700;
    margin-bottom: 14px;
    letter-spacing: 0.5px;
}
.pricing-name {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 10px;
}
.pricing-quote {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text-muted);
    margin-bottom: 22px;
}
.pricing-features {
    list-style: none;
    text-align: left;
    margin-bottom: 26px;
}
.pricing-features li {
    padding: 7px 0;
    color: var(--text-secondary);
    font-size: 0.88rem;
    display: flex;
    align-items: center;
    gap: 8px;
}
.pricing-features li::before {
    content: '✓';
    color: var(--green);
    font-weight: 700;
}

/* ========== 信任标志条 ========== */
.trust-strip {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 36px;
    padding: 36px 24px;
    background: #fff;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}
.trust-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.9rem;
}
.trust-badge {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--primary-soft);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
}

/* ========== FAQ ========== */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}
.faq-item {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    margin-bottom: 10px;
    overflow: hidden;
    transition: var(--transition);
}
.faq-question {
    width: 100%;
    padding: 18px 22px;
    background: none;
    border: none;
    text-align: left;
    font-weight: 600;
    color: var(--text);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.95rem;
}
.faq-icon {
    font-size: 1.2rem;
    color: var(--text-muted);
    transition: var(--transition);
}
.faq-item.open .faq-icon {
    transform: rotate(45deg);
    color: var(--primary);
}
.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease, padding 0.3s ease;
}
.faq-item.open .faq-answer {
    max-height: 400px;
}
.faq-answer-inner {
    padding: 0 22px 18px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.7;
}

/* ========== 博客卡片 ========== */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}
.blog-card {
    background: #fff;
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--border);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}
.blog-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-3px);
}
.blog-card-image {
    width: 100%;
    height: 180px;
    overflow: hidden;
    position: relative;
    background: #f1f5f9;
}
.blog-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.4s ease;
}
.blog-card:hover .blog-card-image img {
    transform: scale(1.05);
}
.blog-card-body {
    padding: 20px 22px;
    flex: 1;
    display: flex;
    flex-direction: column;
}
.blog-card-body h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: #0f172a;
}
.blog-card-body p {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 16px;
    flex: 1;
}
.blog-card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-top: auto;
}
.blog-card-meta .read-more {
    color: var(--primary);
    font-weight: 600;
    text-decoration: none;
}
.blog-card-meta .read-more:hover {
    text-decoration: underline;
}

/* ========== 联系方式 ========== */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 18px;
}
.contact-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px 18px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}
.contact-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}
.contact-icon {
    font-size: 2.2rem;
    margin-bottom: 10px;
}
.contact-value {
    font-weight: 600;
    color: var(--text);
    margin-bottom: 6px;
    font-size: 0.92rem;
    word-break: break-all;
}
.contact-action {
    font-size: 0.78rem;
    color: var(--primary);
    font-weight: 500;
}
.copy-tooltip {
    position: absolute;
    top: -28px;
    left: 50%;
    transform: translateX(-50%);
    background: #1e293b;
    color: #fff;
    padding: 4px 12px;
    border-radius: 6px;
    font-size: 0.72rem;
    opacity: 0;
    transition: 0.2s;
    pointer-events: none;
    white-space: nowrap;
}
.contact-card.show-tooltip .copy-tooltip {
    opacity: 1;
}

/* ========== 页脚 ========== */
.footer {
    background: #0f172a;
    color: #cbd5e1;
    padding: 56px 24px 28px;
    font-size: 0.88rem;
}
.footer-grid {
    max-width: 1240px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 36px;
    margin-bottom: 40px;
}
.footer-col h4 {
    color: #fff;
    font-weight: 700;
    margin-bottom: 14px;
    font-size: 0.95rem;
}
.footer-col ul {
    list-style: none;
}
.footer-col ul li {
    margin-bottom: 7px;
}
.footer-col ul li a {
    color: #94a3b8;
    text-decoration: none;
    transition: 0.2s;
}
.footer-col ul li a:hover {
    color: #fff;
}
.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #334155;
    color: #64748b;
    font-size: 0.82rem;
    max-width: 1240px;
    margin: 0 auto;
}

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
    .nav-links a {
        padding: 6px 10px;
        font-size: 0.8rem;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    .hamburger {
        display: block;
    }
    .hero {
        padding: 120px 20px 60px;
    }
    .section {
        padding: 56px 20px;
    }
    .pricing-card.featured {
        transform: none;
    }
    .process-steps {
        gap: 12px;
    }
    .process-step {
        min-width: 120px;
        flex: 0 1 calc(50% - 12px);
    }
    .case-image,
    .blog-card-image {
        height: 160px;
    }
}

@media (max-width: 480px) {
    .process-step {
        flex: 0 1 calc(50% - 8px);
        min-width: 100px;
    }
    .hero h1 {
        font-size: 2rem;
    }
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    .btn {
        width: 100%;
        justify-content: center;
    }
    .case-image,
    .blog-card-image {
        height: 140px;
    }
}