/* ===================================================================
   百盛激光焊 官网样式表  style.css
   设计风格：工业加工 / 模具行业 简约商务风
   主色调：深蓝 #0d2b4a + 钢蓝 #2d6da3 + 金属灰 #4a5568
   布局：移动优先，CSS Grid + Flexbox 实现响应式
   =================================================================== */

/* ---------- 1. CSS 变量：统一主题色与基础值 ---------- */
:root {
    --color-primary: #0d2b4a;        /* 深蓝 主色 */
    --color-primary-dark: #081d35;   /* 更深蓝 */
    --color-accent: #2d6da3;         /* 钢蓝 强调色 */
    --color-accent-light: #3a8cc9;   /* 浅钢蓝 */
    --color-gray-900: #1a202c;       /* 深灰文字 */
    --color-gray-700: #2d3748;       /* 正文文字 */
    --color-gray-500: #718096;       /* 次要文字 */
    --color-gray-300: #cbd5e0;       /* 边框 */
    --color-gray-200: #e2e8f0;       /* 分隔线 */
    --color-gray-100: #f1f5f9;       /* 浅背景 */
    --color-gray-50: #f7fafc;        /* 最浅背景 */
    --color-white: #ffffff;
    --color-gold: #c9a55c;           /* 点缀金 */

    --radius: 6px;
    --shadow-sm: 0 1px 3px rgba(13, 43, 74, 0.08);
    --shadow-md: 0 4px 12px rgba(13, 43, 74, 0.12);
    --shadow-lg: 0 8px 24px rgba(13, 43, 74, 0.16);

    --container: 1200px;
    --font-base: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;

    --transition: all 0.25s ease;
}

/* ---------- 2. 基础重置 ---------- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    /* 根字号，移动端 rem 基准 */
    font-size: 16px;
}

body {
    font-family: var(--font-base);
    color: var(--color-gray-700);
    background: var(--color-white);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

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

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

a:hover {
    color: var(--color-primary);
}

ul {
    list-style: none;
}

/* ---------- 3. 通用布局容器 ---------- */
.container {
    width: 100%;
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 16px;
}

.section {
    padding: 56px 0;
}

.section--gray {
    background: var(--color-gray-50);
}

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

/* 标题块：统一管理 h1/h2/h3 层级，利于 SEO */
.section-head {
    text-align: center;
    margin-bottom: 36px;
}

.section-head h2 {
    font-size: 1.75rem;
    color: var(--color-primary);
    font-weight: 700;
    margin-bottom: 10px;
}

.section--primary .section-head h2 {
    color: var(--color-white);
}

.section-head .subtitle {
    color: var(--color-gray-500);
    font-size: 0.95rem;
}

.section--primary .section-head .subtitle {
    color: rgba(255, 255, 255, 0.75);
}

/* 标题下划线装饰 */
.section-head h2::after {
    content: "";
    display: block;
    width: 56px;
    height: 3px;
    background: var(--color-accent);
    margin: 12px auto 0;
    border-radius: 2px;
}

/* 文字工具类 */
.text-center { text-align: center; }
.text-primary { color: var(--color-primary); }
.text-accent { color: var(--color-accent); }
.highlight { color: var(--color-accent); font-weight: 600; }

/* ---------- 4. 顶部导航 header ---------- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--color-white);
    box-shadow: var(--shadow-sm);
}

/* 顶部联系方式条 */
.top-bar {
    background: var(--color-primary-dark);
    color: rgba(255, 255, 255, 0.85);
    font-size: 0.82rem;
}

.top-bar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 6px;
    padding-top: 6px;
    padding-bottom: 6px;
}

.top-bar a {
    color: rgba(255, 255, 255, 0.85);
}

.top-bar a:hover {
    color: var(--color-gold);
}

.top-bar .sep {
    margin: 0 8px;
    opacity: 0.4;
}

/* 主导航 */
.nav-wrap {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    max-width: var(--container);
    margin: 0 auto;
}

/* Logo 区 */
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}

.logo-mark {
    width: 42px;
    height: 42px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-white);
    font-weight: 700;
    font-size: 1.1rem;
    letter-spacing: 1px;
}

.logo-text {
    line-height: 1.2;
}

.logo-text .name {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-primary);
}

.logo-text .tag {
    font-size: 0.72rem;
    color: var(--color-gray-500);
}

/* 导航菜单 */
.nav-menu {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-menu a {
    display: block;
    padding: 10px 16px;
    color: var(--color-gray-700);
    font-weight: 500;
    font-size: 0.95rem;
    border-radius: var(--radius);
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--color-primary);
    background: var(--color-gray-100);
}

/* 移动端汉堡按钮 */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 28px;
    height: 22px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
}

.nav-toggle span {
    display: block;
    height: 3px;
    width: 100%;
    background: var(--color-primary);
    border-radius: 2px;
    transition: var(--transition);
}

/* 移动端导航展开 */
@media (max-width: 860px) {
    .nav-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 75%;
        max-width: 320px;
        height: 100vh;
        background: var(--color-white);
        flex-direction: column;
        align-items: stretch;
        padding: 72px 16px 24px;
        box-shadow: var(--shadow-lg);
        transition: right 0.3s ease;
        z-index: 999;
        gap: 0;
    }

    .nav-menu.open {
        right: 0;
    }

    .nav-menu a {
        padding: 14px 16px;
        font-size: 1.05rem;
        border-bottom: 1px solid var(--color-gray-200);
        border-radius: 0;
    }

    /* 遮罩层 */
    .nav-overlay {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.4);
        z-index: 998;
    }

    .nav-overlay.show {
        display: block;
    }
}

/* ---------- 5. 按钮 ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 12px 28px;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    text-align: center;
}

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

.btn-primary:hover {
    background: var(--color-primary);
    color: var(--color-white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

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

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

.btn-call:hover {
    background: #b8923f;
    color: var(--color-white);
}

.btn-lg {
    padding: 14px 36px;
    font-size: 1.1rem;
}

/* ---------- 6. Hero 首屏 banner ---------- */
.hero {
    position: relative;
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 60%, var(--color-accent) 100%);
    color: var(--color-white);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    opacity: 0.35;
}

.hero-inner {
    position: relative;
    z-index: 2;
    padding: 64px 0 72px;
}

.hero h1 {
    font-size: 2.2rem;
    font-weight: 800;
    line-height: 1.3;
    margin-bottom: 16px;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.hero h1 .accent {
    color: var(--color-gold);
}

.hero .lead {
    font-size: 1.1rem;
    margin-bottom: 28px;
    max-width: 640px;
    opacity: 0.95;
}

.hero-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 12px 24px;
    margin-bottom: 32px;
    font-size: 0.95rem;
}

.hero-meta span {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
}

@media (max-width: 600px) {
    .hero h1 { font-size: 1.65rem; }
    .hero .lead { font-size: 1rem; }
    .hero-inner { padding: 44px 0 52px; }
}

/* ---------- 7. 卡片网格（主营项目、优势等通用） ---------- */
.grid {
    display: grid;
    gap: 20px;
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 860px) {
    .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 560px) {
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

.card {
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius);
    padding: 24px;
    transition: var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
    border-color: var(--color-accent);
}

.card .icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius);
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    color: var(--color-white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    margin-bottom: 14px;
}

.card h3 {
    color: var(--color-primary);
    font-size: 1.1rem;
    margin-bottom: 8px;
}

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

/* ---------- 8. 公司简介区 ---------- */
.intro {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 40px;
    align-items: center;
}

.intro-text h2 {
    color: var(--color-primary);
    font-size: 1.75rem;
    margin-bottom: 16px;
}

.intro-text p {
    margin-bottom: 14px;
    color: var(--color-gray-700);
}

.intro-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-top: 24px;
}

.intro-stats .stat {
    text-align: center;
    background: var(--color-gray-100);
    padding: 18px 10px;
    border-radius: var(--radius);
}

.intro-stats .stat .num {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--color-accent);
    line-height: 1;
}

.intro-stats .stat .label {
    font-size: 0.82rem;
    color: var(--color-gray-500);
    margin-top: 6px;
}

.intro-img {
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.intro-img img {
    width: 100%;
    height: 320px;
    object-fit: cover;
}

@media (max-width: 860px) {
    .intro { grid-template-columns: 1fr; }
    .intro-img img { height: 240px; }
}

/* ---------- 9. 标签列表（可修复缺陷、适配钢材等） ---------- */
.tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
}

.tag-list li {
    background: var(--color-white);
    border: 1px solid var(--color-gray-300);
    border-left: 3px solid var(--color-accent);
    padding: 10px 18px;
    border-radius: var(--radius);
    font-size: 0.95rem;
    color: var(--color-gray-700);
    font-weight: 500;
    transition: var(--transition);
}

.tag-list li:hover {
    background: var(--color-primary);
    color: var(--color-white);
    border-color: var(--color-primary);
}

.section--primary .tag-list li {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.2);
    border-left-color: var(--color-gold);
    color: var(--color-white);
}

/* ---------- 9.5 FAQ 常见问题列表 ---------- */
.faq-list {
    max-width: 880px;
    margin: 0 auto;
}

.faq-item {
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-left: 4px solid var(--color-accent);
    border-radius: var(--radius);
    padding: 20px 24px;
    margin-bottom: 14px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.faq-item:hover {
    box-shadow: var(--shadow);
    border-left-color: var(--color-primary);
}

.faq-item h3 {
    font-size: 1.05rem;
    color: var(--color-primary);
    margin-bottom: 8px;
    font-weight: 600;
}

.faq-item p {
    font-size: 0.95rem;
    line-height: 1.7;
    color: var(--color-gray-700);
    margin: 0;
}

.faq-item p a {
    color: var(--color-accent);
    font-weight: 600;
}

/* ---------- 10. 联系信息卡片 ---------- */
.contact-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.contact-card {
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-top: 4px solid var(--color-accent);
    border-radius: var(--radius);
    padding: 28px 24px;
    text-align: center;
    box-shadow: var(--shadow-sm);
}

.contact-card .icon {
    font-size: 2rem;
    margin-bottom: 12px;
}

.contact-card h3 {
    color: var(--color-gray-500);
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 8px;
}

.contact-card .value {
    color: var(--color-primary);
    font-size: 1.4rem;
    font-weight: 700;
}

.contact-card .value a {
    color: inherit;
}

.contact-card .sub {
    font-size: 0.85rem;
    color: var(--color-gray-500);
    margin-top: 6px;
}

@media (max-width: 720px) {
    .contact-cards { grid-template-columns: 1fr; }
}

/* ---------- 11. 地图模块 ---------- */
.map-wrap {
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    background: var(--color-gray-100);
}

.map-wrap iframe {
    display: block;
    width: 100%;
    height: 380px;
    border: 0;
}

@media (max-width: 600px) {
    .map-wrap iframe { height: 300px; }
}

/* ---------- 12. 留言表单 ---------- */
.form-wrap {
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius);
    padding: 32px;
    box-shadow: var(--shadow-sm);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

@media (max-width: 600px) {
    .form-row { grid-template-columns: 1fr; }
}

.form-group {
    margin-bottom: 18px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 600;
    color: var(--color-gray-700);
    font-size: 0.95rem;
}

.form-group label .req {
    color: #e53e3e;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius);
    font-size: 1rem;
    font-family: var(--font-base);
    background: var(--color-gray-50);
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--color-accent);
    background: var(--color-white);
    box-shadow: 0 0 0 3px rgba(45, 109, 163, 0.12);
}

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

/* 蜜罐字段：隐藏的诱饵字段，机器人会填写，真实用户不会，用于防爬虫 */
.honeypot {
    position: absolute;
    left: -9999px;
    top: -9999px;
}

/* 表单提示消息 */
.form-msg {
    padding: 12px 16px;
    border-radius: var(--radius);
    margin-bottom: 18px;
    font-size: 0.95rem;
    display: none;
}

.form-msg.success {
    display: block;
    background: #e6ffed;
    color: #1a7e34;
    border: 1px solid #b7eb8f;
}

.form-msg.error {
    display: block;
    background: #fff0f0;
    color: #c92a2a;
    border: 1px solid #ffc9c9;
}

/* ---------- 13. 页面通用 banner（内页） ---------- */
.page-banner {
    background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
    color: var(--color-white);
    padding: 48px 0;
    text-align: center;
}

.page-banner h1 {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 10px;
}

.page-banner .breadcrumb {
    font-size: 0.9rem;
    opacity: 0.85;
}

.page-banner .breadcrumb a {
    color: rgba(255, 255, 255, 0.85);
}

.page-banner .breadcrumb a:hover {
    color: var(--color-gold);
}

@media (max-width: 600px) {
    .page-banner h1 { font-size: 1.5rem; }
    .page-banner { padding: 36px 0; }
}

/* ---------- 14. 业务列表（带序号） ---------- */
.biz-list {
    display: grid;
    gap: 20px;
}

.biz-item {
    display: grid;
    grid-template-columns: 60px 1fr;
    gap: 20px;
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius);
    padding: 24px;
    transition: var(--transition);
}

.biz-item:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-accent);
}

.biz-item .num {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    color: var(--color-white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.2rem;
}

.biz-item h3 {
    color: var(--color-primary);
    font-size: 1.15rem;
    margin-bottom: 8px;
}

.biz-item p {
    color: var(--color-gray-700);
    font-size: 0.95rem;
}

/* ---------- 15. 工艺优势特性 ---------- */
.feature {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
}

.feature + .feature {
    margin-top: 56px;
}

.feature.reverse .feature-img {
    order: 2;
}

.feature-img {
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.feature-img img {
    width: 100%;
    height: 280px;
    object-fit: cover;
}

.feature-text h3 {
    color: var(--color-primary);
    font-size: 1.5rem;
    margin-bottom: 14px;
}

.feature-text p {
    margin-bottom: 12px;
}

.feature-text ul.check-list li {
    position: relative;
    padding-left: 26px;
    margin-bottom: 8px;
    color: var(--color-gray-700);
}

.feature-text ul.check-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    top: 0;
    width: 18px;
    height: 18px;
    background: var(--color-accent);
    color: var(--color-white);
    border-radius: 50%;
    font-size: 0.7rem;
    display: flex;
    align-items: center;
    justify-content: center;
    top: 4px;
}

@media (max-width: 860px) {
    .feature, .feature.reverse { grid-template-columns: 1fr; gap: 24px; }
    .feature.reverse .feature-img { order: 0; }
    .feature-img img { height: 220px; }
}

/* ---------- 16. CTA 行动号召区 ---------- */
.cta {
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    color: var(--color-white);
    text-align: center;
    padding: 56px 0;
}

.cta h2 {
    font-size: 1.75rem;
    margin-bottom: 12px;
}

.cta p {
    margin-bottom: 24px;
    opacity: 0.9;
}

.cta .hero-actions {
    justify-content: center;
}

/* ---------- 17. 底部 footer ---------- */
.site-footer {
    background: var(--color-primary-dark);
    color: rgba(255, 255, 255, 0.8);
    padding: 48px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
    gap: 32px;
    padding-bottom: 32px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.footer-col h4 {
    color: var(--color-white);
    font-size: 1.05rem;
    margin-bottom: 16px;
}

.footer-col p,
.footer-col li {
    font-size: 0.9rem;
    line-height: 1.9;
    color: rgba(255, 255, 255, 0.7);
}

.footer-col a {
    color: rgba(255, 255, 255, 0.7);
}

.footer-col a:hover {
    color: var(--color-gold);
}

.footer-col .tel {
    font-size: 1.4rem;
    color: var(--color-gold);
    font-weight: 700;
    display: block;
    margin: 6px 0;
}

.footer-bottom {
    padding: 18px 0;
    text-align: center;
    font-size: 0.82rem;
    color: rgba(255, 255, 255, 0.5);
}

@media (max-width: 860px) {
    .footer-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
}

@media (max-width: 560px) {
    .footer-grid { grid-template-columns: 1fr; }
}

/* ---------- 18. 浮动电话按钮（移动端） ---------- */
.float-call {
    display: none;
    position: fixed;
    right: 16px;
    bottom: 16px;
    z-index: 900;
    background: var(--color-gold);
    color: var(--color-white);
    width: 56px;
    height: 56px;
    border-radius: 50%;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    font-size: 1.4rem;
}

.float-call:hover {
    color: var(--color-white);
    transform: scale(1.08);
}

@media (max-width: 600px) {
    .float-call { display: flex; }
}

/* ---------- 19. 工具类与打印优化 ---------- */
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.mt-2 { margin-top: 16px; }
.mt-4 { margin-top: 32px; }

/* 隐藏文字（仅 SEO/AI 爬虫可见的辅助说明，不可滥用） */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* 打印优化 */
@media print {
    .site-header, .float-call, .nav-toggle, .hero-actions, .cta { display: none; }
    body { color: #000; }
}