/* ============================================
   脉行网络科技（四川）有限公司 - 官网样式
   风格：简约商务 / 科技感 / Unlock 风格
   ============================================ */

/* ===== 基础变量（配色取自脉行科技 Logo） ===== */
:root {
    --primary: #0d4f8c;
    --primary-dark: #0a3d62;
    --primary-light: #1976d2;
    --accent: #00bcd4;
    --accent-green: #7cb342;
    --dark: #0f172a;
    --gray-900: #1e293b;
    --gray-700: #334155;
    --gray-500: #64748b;
    --gray-300: #cbd5e1;
    --gray-100: #f1f5f9;
    --gray-50: #f8fafc;
    --white: #ffffff;
    --shadow-sm: 0 1px 3px rgba(0,0,0,.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,.08);
    --shadow-lg: 0 12px 32px rgba(0,0,0,.12);
    --radius: 12px;
    --transition: .3s ease;
}

/* ===== 重置 ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--gray-700);
    line-height: 1.7;
    background: var(--white);
    overflow-x: hidden;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

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

/* ===== 通用按钮 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 32px;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    white-space: nowrap;
}
.btn-primary {
    background: var(--primary);
    color: var(--white);
}
.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(37,99,235,.3);
}
.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}
.btn-outline:hover {
    background: var(--primary);
    color: var(--white);
}
.btn-block { width: 100%; }

/* ===== 通用区块头部 ===== */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}
.section-tag {
    display: inline-block;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 2px;
    color: var(--primary);
    text-transform: uppercase;
    margin-bottom: 12px;
}
.section-title {
    font-size: 36px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 16px;
}
.section-desc {
    font-size: 16px;
    color: var(--gray-500);
    max-width: 600px;
    margin: 0 auto;
}

/* ============================================
   导航栏
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 16px 0;
    transition: var(--transition);
    background: rgba(255,255,255,.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid transparent;
}
.navbar.scrolled {
    box-shadow: var(--shadow-md);
    border-bottom-color: var(--gray-100);
}
.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 24px;
    font-weight: 700;
    color: var(--dark);
}
.logo-img {
    height: 52px;
    width: auto;
    object-fit: contain;
}
.logo-img-full {
    height: 110px;
    width: auto;
    object-fit: contain;
    margin-bottom: 12px;
}
.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 18px;
}
.nav-menu {
    display: flex;
    gap: 36px;
}
.nav-link {
    font-size: 15px;
    font-weight: 500;
    color: var(--gray-700);
    transition: var(--transition);
    position: relative;
}
.nav-link::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: var(--transition);
}
.nav-link:hover,
.nav-link.active {
    color: var(--primary);
}
.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}
.nav-toggle span {
    width: 26px;
    height: 3px;
    background: var(--dark);
    border-radius: 3px;
    transition: var(--transition);
}

/* ============================================
   Hero 区域
   ============================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 0 80px;
    overflow: hidden;
}
.hero-bg {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, #eff6ff 0%, #f0fdfa 50%, #f8fafc 100%);
    z-index: -2;
}
.hero-bg::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(37,99,235,.12) 0%, transparent 70%);
    border-radius: 50%;
}
.hero-bg::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(6,182,212,.1) 0%, transparent 70%);
    border-radius: 50%;
}
.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}
.hero-tag {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(37,99,235,.1);
    color: var(--primary);
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 24px;
}
.hero-title {
    font-size: 52px;
    font-weight: 900;
    line-height: 1.2;
    color: var(--dark);
    margin-bottom: 24px;
}
.hero-title .highlight {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-desc {
    font-size: 18px;
    color: var(--gray-500);
    margin-bottom: 36px;
    max-width: 520px;
}
.hero-btns {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}
.hero-visual {
    position: relative;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}
.hero-card {
    background: var(--white);
    padding: 32px 24px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    text-align: center;
    transition: var(--transition);
}
.hero-card:hover {
    transform: translateY(-8px);
}
.hero-card-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 16px;
    background: linear-gradient(135deg, var(--accent), var(--accent-green));
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 24px;
}
.hero-card h3 {
    font-size: 18px;
    color: var(--dark);
    margin-bottom: 6px;
}
.hero-card p {
    font-size: 13px;
    color: var(--gray-500);
}
.hero-card:nth-child(1) { grid-column: 1; }
.hero-card:nth-child(2) { grid-column: 2; margin-top: 40px; }
.hero-card:nth-child(3) { grid-column: 1 / span 2; }

@keyframes floating {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}
.floating {
    animation: floating 3s ease-in-out infinite;
}

.hero-scroll {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
}
.hero-scroll a {
    color: var(--gray-500);
    font-size: 18px;
    animation: bounce 2s infinite;
}
@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
    60% { transform: translateY(-5px); }
}

/* ============================================
   数据统计
   ============================================ */
.stats {
    padding: 60px 0;
    background: var(--dark);
}
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}
.stat-item {
    text-align: center;
    color: var(--white);
}
.stat-num {
    font-size: 48px;
    font-weight: 900;
    background: linear-gradient(135deg, var(--primary-light), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}
.stat-item p {
    font-size: 14px;
    color: var(--gray-300);
}

/* ============================================
   服务范围
   ============================================ */
.services {
    padding: 100px 0;
    background: var(--gray-50);
}
.services-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.service-card {
    background: var(--white);
    padding: 36px 28px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid transparent;
}
.service-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}
.service-icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, rgba(37,99,235,.1), rgba(6,182,212,.1));
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    font-size: 22px;
    margin-bottom: 20px;
    transition: var(--transition);
}
.service-card:hover .service-icon {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: var(--white);
}
.service-card h3 {
    font-size: 18px;
    color: var(--dark);
    margin-bottom: 10px;
}
.service-card p {
    font-size: 14px;
    color: var(--gray-500);
    line-height: 1.6;
}

/* ============================================
   关于我们
   ============================================ */
.about {
    padding: 100px 0;
}
.about-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}
.about-image {
    position: relative;
}
.about-image img {
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
}
.about-badge {
    position: absolute;
    bottom: -20px;
    right: -20px;
    background: var(--white);
    padding: 20px 30px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    text-align: center;
}
.badge-num {
    display: block;
    font-size: 32px;
    font-weight: 900;
    color: var(--primary);
}
.badge-text {
    font-size: 13px;
    color: var(--gray-500);
}
.about-content .section-title {
    margin: 12px 0 20px;
}
.about-content p {
    margin-bottom: 16px;
    color: var(--gray-500);
}
.about-list {
    margin: 24px 0 32px;
}
.about-list li {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
    color: var(--gray-700);
}
.about-list i {
    color: var(--primary);
    font-size: 18px;
}

/* ============================================
   为什么选择我们
   ============================================ */
.features {
    padding: 100px 0;
    background: var(--gray-50);
}
.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.feature-item {
    background: var(--white);
    padding: 36px 28px;
    border-radius: var(--radius);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}
.feature-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 0;
    background: linear-gradient(180deg, var(--primary), var(--accent));
    transition: var(--transition);
}
.feature-item:hover::before {
    height: 100%;
}
.feature-item:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}
.feature-num {
    font-size: 40px;
    font-weight: 900;
    color: var(--gray-100);
    margin-bottom: 12px;
    transition: var(--transition);
}
.feature-item:hover .feature-num {
    color: rgba(37,99,235,.15);
}
.feature-item h3 {
    font-size: 18px;
    color: var(--dark);
    margin-bottom: 10px;
}
.feature-item p {
    font-size: 14px;
    color: var(--gray-500);
    line-height: 1.6;
}

/* ============================================
   解决方案
   ============================================ */
.solutions {
    padding: 100px 0;
}
.solutions-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}
.solution-card {
    background: var(--white);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}
.solution-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}
.solution-img {
    height: 220px;
    overflow: hidden;
}
.solution-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform .5s ease;
}
.solution-card:hover .solution-img img {
    transform: scale(1.08);
}
.solution-body {
    padding: 28px;
}
.solution-body h3 {
    font-size: 20px;
    color: var(--dark);
    margin-bottom: 12px;
}
.solution-body p {
    font-size: 14px;
    color: var(--gray-500);
    margin-bottom: 16px;
    line-height: 1.6;
}
.solution-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--primary);
    font-weight: 500;
    font-size: 14px;
    transition: var(--transition);
}
.solution-link:hover {
    gap: 12px;
}

/* ============================================
   联系我们
   ============================================ */
.contact {
    padding: 100px 0;
    background: var(--gray-50);
}
.contact-container {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 50px;
}
.contact-info {
    display: flex;
    flex-direction: column;
    gap: 24px;
}
.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 20px;
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}
.contact-item:hover {
    transform: translateX(6px);
    box-shadow: var(--shadow-md);
}
.contact-icon {
    width: 48px;
    height: 48px;
    min-width: 48px;
    background: linear-gradient(135deg, rgba(37,99,235,.1), rgba(6,182,212,.1));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    font-size: 18px;
}
.contact-item h4 {
    font-size: 15px;
    color: var(--dark);
    margin-bottom: 4px;
}
.contact-item p {
    font-size: 14px;
    color: var(--gray-500);
}
.contact-form {
    background: var(--white);
    padding: 36px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
}
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 16px;
}
.form-group {
    margin-bottom: 16px;
}
.form-group input,
.form-group textarea {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid var(--gray-300);
    border-radius: 8px;
    font-size: 14px;
    font-family: inherit;
    transition: var(--transition);
    background: var(--gray-50);
}
.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    background: var(--white);
    box-shadow: 0 0 0 3px rgba(37,99,235,.1);
}
.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* ============================================
   页脚
   ============================================ */
.footer {
    background: var(--dark);
    padding: 70px 0 0;
    color: var(--gray-300);
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 40px;
    padding-bottom: 50px;
}
.footer-col .logo {
    color: var(--white);
    margin-bottom: 16px;
}
.footer-col p {
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 20px;
}
.footer-social {
    display: flex;
    gap: 12px;
}
.footer-social a {
    width: 40px;
    height: 40px;
    background: rgba(255,255,255,.08);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}
.footer-social a:hover {
    background: var(--primary);
    transform: translateY(-3px);
}
.footer-col h4 {
    color: var(--white);
    font-size: 16px;
    margin-bottom: 20px;
}
.footer-col ul li {
    margin-bottom: 10px;
}
.footer-col ul li a {
    font-size: 14px;
    color: var(--gray-300);
    transition: var(--transition);
}
.footer-col ul li a:hover {
    color: var(--primary-light);
    padding-left: 4px;
}
.footer-contact li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 13px;
    line-height: 1.6;
}
.footer-contact i {
    color: var(--primary-light);
    margin-top: 3px;
}
.footer-bottom {
    border-top: 1px solid rgba(255,255,255,.1);
    padding: 24px 0;
    text-align: center;
    font-size: 13px;
    color: var(--gray-500);
}
.footer-bottom .icp-link {
    color: var(--gray-500);
    transition: var(--transition);
}
.footer-bottom .icp-link:hover {
    color: var(--accent);
}

/* ============================================
   回到顶部
   ============================================ */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    background: var(--primary);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--transition);
    z-index: 999;
}
.back-to-top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-3px);
}

/* ============================================
   响应式
   ============================================ */
@media (max-width: 992px) {
    .hero-content,
    .about-container {
        grid-template-columns: 1fr;
        gap: 50px;
    }
    .hero-title { font-size: 42px; }
    .services-grid,
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .solutions-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .contact-container {
        grid-template-columns: 1fr;
    }
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .section-title { font-size: 30px; }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        background: var(--white);
        flex-direction: column;
        gap: 0;
        box-shadow: var(--shadow-md);
        max-height: 0;
        overflow: hidden;
        transition: var(--transition);
    }
    .nav-menu.open {
        max-height: 400px;
    }
    .nav-link {
        display: block;
        padding: 16px 24px;
        border-bottom: 1px solid var(--gray-100);
    }
    .nav-toggle {
        display: flex;
    }
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(6px, 6px);
    }
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(6px, -6px);
    }
    .hero { padding: 100px 0 60px; }
    .hero-title { font-size: 34px; }
    .hero-desc { font-size: 16px; }
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 30px 20px;
    }
    .stat-num { font-size: 36px; }
    .section-title { font-size: 26px; }
    .services, .about, .features, .solutions, .contact {
        padding: 60px 0;
    }
    .form-row {
        grid-template-columns: 1fr;
    }
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    .about-badge {
        right: 10px;
        bottom: 10px;
    }
}

@media (max-width: 480px) {
    .services-grid,
    .features-grid,
    .solutions-grid {
        grid-template-columns: 1fr;
    }
    .hero-btns { flex-direction: column; }
    .hero-btns .btn { width: 100%; }
    .contact-form { padding: 24px; }
}