/* ============================================================
   英钛乐智能制造 · 主样式
   设计语言：亮科技蓝 + 工业橙点缀 | 图片优先 | 现代卡片
   ------------------------------------------------------------
   所有字号 / 字体 / 字重 / 行高都在 :root 集中；
   data.js 的 theme 字段可被 site.js 运行时注入覆盖。
   ============================================================ */

:root {
  /* 颜色 */
  --c-primary: #1558c4;      /* 亮科技蓝 */
  --c-primary-2: #2e7bdb;    /* 天蓝 */
  --c-accent: #ff7a18;       /* 工业橙 */
  --c-accent-2: #ffb45e;     /* 浅橙 */
  --c-bg: #ffffff;
  --c-bg-soft: #f6f8fd;      /* 浅云蓝 */
  --c-dark: #16305e;
  --c-text: #24324e;
  --c-muted: #5b6b87;
  --c-line: #e4eaf4;
  /* 几何 */
  --radius: 18px;
  --shadow: 0 18px 50px -18px rgba(21, 88, 196, .18);
  --shadow-sm: 0 10px 24px -12px rgba(21, 88, 196, .14);
  --max: 1200px;
  /* 字体栈（默认系统栈，可被 theme.fontFamily 覆盖） */
  --font: "Segoe UI", "Microsoft YaHei", "PingFang SC", system-ui, -apple-system, sans-serif;
  /* 排版：字号档（可被 theme.sizeScale 整体覆盖） */
  --fs-base: 16px;
  --fs-nav: 15px;
  --fs-btn: 15px;
  --fs-header-cta: 14px;
  --fs-brand: 19px;          /* 导航大字 */
  --fs-brand-en: 10px;       /* 导航英文 */
  --fs-brand-mark: 15px;
  --fs-h1min: 42px;
  --fs-h1max: 72px;
  --fs-page-h1min: 34px;
  --fs-page-h1max: 52px;
  --fs-pre: 12px;
  --fs-hero-sub: 17px;
  --fs-tag: 14px;
  --fs-eyebrow: 13px;
  --fs-h2min: 30px;
  --fs-h2max: 44px;
  --fs-section-p: 16px;
  --fs-stat: 46px;
  --fs-stat-mobile: 36px;
  --fs-h3: 19px;
  --fs-h3-about: 26px;
  --fs-h3-form: 22px;
  --fs-card-meta: 14px;
  --fs-h4: 19px;
  --fs-h4-about: 20px;
  --fs-h4-adv: 20px;
  --fs-product-title: 18px;
  --fs-label: 13px;
  --fs-tag-mini: 11px;
  --fs-card-body: 15px;
  --fs-customer: 17px;
  --fs-motto: 30px;
  --fs-motto-mobile: 22px;
  --fs-contact-label: 14px;
  --fs-contact-value: 17px;
  --fs-form-input: 15px;
  --fs-form-hint: 12px;
  --fs-footer: 14px;
  --fs-foot-h4: 15px;
  --fs-foot-bottom: 13px;
  /* 字重：标题默认 800，可被 theme.headingWeight 覆盖 */
  --fw-h: 800;
  /* 行高 */
  --lh-base: 1.65;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  font-size: var(--fs-base);
  color: var(--c-text);
  background: var(--c-bg);
  line-height: var(--lh-base);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
.container { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 24px; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 28px; border-radius: 999px; font-weight: 700;
  font-size: var(--fs-btn); border: 2px solid transparent; cursor: pointer;
  transition: transform .25s, box-shadow .25s, background .25s, color .25s;
}
.btn-primary {
  background: linear-gradient(135deg, var(--c-accent), var(--c-accent-2));
  color: #fff; box-shadow: 0 12px 26px -10px rgba(255, 122, 24, .6);
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 18px 34px -10px rgba(255, 122, 24, .7); }
.btn-ghost { background: rgba(255,255,255,.12); color: #fff; border-color: rgba(255,255,255,.5); backdrop-filter: blur(6px); }
.btn-ghost:hover { background: rgba(255,255,255,.22); transform: translateY(-3px); }
.btn-outline { background: transparent; color: var(--c-primary-2); border-color: var(--c-primary-2); }
.btn-outline:hover { background: var(--c-primary-2); color: #fff; }

/* ---------- 页头 ---------- */
.header-spacer { height: 76px; }
.site-header {
  position: fixed; top: 0; left: 0; right: 0; height: 76px; z-index: 900;
  background: rgba(255,255,255,.92); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--c-line);
}
.header-inner { display: flex; align-items: center; height: 76px; gap: 28px; }
.brand { display: flex; align-items: center; gap: 14px; }
.brand-mark {
  display: grid; place-items: center; width: 44px; height: 44px;
  background: linear-gradient(135deg, var(--c-primary), var(--c-primary-2));
  color: #fff; font-weight: var(--fw-h); font-size: var(--fs-brand-mark); border-radius: 10px;
  letter-spacing: 1px; box-shadow: var(--shadow-sm);
}
.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-text strong { font-size: var(--fs-brand); color: var(--c-dark); letter-spacing: .5px; }
.brand-text small { font-size: var(--fs-brand-en); color: var(--c-muted); letter-spacing: .5px; margin-top: 3px; }

.site-nav { display: flex; gap: 6px; margin-left: auto; }
.nav-link {
  padding: 9px 18px; border-radius: 999px; font-weight: 600; font-size: var(--fs-nav);
  color: var(--c-text); transition: background .2s, color .2s;
}
.nav-link:hover { background: var(--c-bg-soft); color: var(--c-primary-2); }
.nav-link.is-active { background: var(--c-primary); color: #fff; }
.header-cta { margin-left: 8px; padding: 11px 24px; font-size: var(--fs-header-cta); }

.nav-toggle { display: none; background: none; border: 0; cursor: pointer; width: 42px; height: 42px; position: relative; }
.nav-toggle span { position: absolute; left: 10px; right: 10px; height: 2px; background: var(--c-dark); border-radius: 2px; transition: .3s; }
.nav-toggle span:nth-child(1) { top: 15px; }
.nav-toggle span:nth-child(2) { top: 21px; }
.nav-toggle span:nth-child(3) { top: 27px; }

/* ---------- Hero ---------- */
.hero { position: relative; min-height: 88vh; display: flex; align-items: center; color: #fff; overflow: hidden; }
.hero-bg { position: absolute; inset: 0; background-size: cover; background-position: center; }
.hero-bg::before {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(100deg, rgba(13,50,110,.80) 0%, rgba(21,88,196,.42) 45%, rgba(21,88,196,.08) 100%);
}
.hero-bg::after {
  content: ""; position: absolute; inset: 0; opacity: .25;
  background-image: radial-gradient(circle at 20% 30%, var(--c-accent) 0, transparent 40%),
                    radial-gradient(circle at 80% 70%, var(--c-accent-2) 0, transparent 40%);
  mix-blend-mode: overlay;
}
.hero-content { position: relative; z-index: 2; max-width: 640px; padding: 120px 0 90px; }
.hero-pre {
  display: inline-flex; align-items: center; gap: 10px; font-size: var(--fs-pre); font-weight: 700;
  letter-spacing: 3px; color: var(--c-accent-2); text-transform: uppercase;
  padding: 8px 16px; border: 1px solid rgba(255,255,255,.3); border-radius: 999px; margin-bottom: 26px;
  background: rgba(255,255,255,.06);
}
.hero h1 { font-size: clamp(var(--fs-h1min), 6vw, var(--fs-h1max)); line-height: 1.05; font-weight: var(--fw-h); letter-spacing: -1px; }
.hero h1 em { font-style: normal; background: linear-gradient(120deg, var(--c-accent), var(--c-accent-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-sub { margin: 24px 0 36px; font-size: var(--fs-hero-sub); color: rgba(255,255,255,.85); max-width: 520px; }
.hero-cta { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-tag { margin-top: 46px; display: flex; gap: 30px; flex-wrap: wrap; }
.hero-tag span { display: flex; align-items: center; gap: 8px; font-weight: 600; font-size: var(--fs-tag); color: rgba(255,255,255,.85); }

/* ---------- 通用 Section ---------- */
.section { padding: 96px 0; }
.section-soft { background: var(--c-bg-soft); }
.section-dark { background: linear-gradient(160deg, var(--c-primary), var(--c-primary-2)); color: #fff; }
.section-head { max-width: 760px; margin-bottom: 56px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 10px; font-weight: 700; font-size: var(--fs-eyebrow);
  letter-spacing: 2px; text-transform: uppercase; color: var(--c-accent); margin-bottom: 16px;
}
.eyebrow::before { content: ""; width: 26px; height: 3px; background: var(--c-accent); border-radius: 3px; }
.section-head h2 { font-size: clamp(var(--fs-h2min), 4vw, var(--fs-h2max)); line-height: 1.15; color: var(--c-dark); font-weight: var(--fw-h); letter-spacing: -0.5px; }
.section-head p { margin-top: 16px; color: var(--c-muted); font-size: var(--fs-section-p); }
.section-dark .section-head h2 { color: #fff; }
.section-dark .section-head p { color: rgba(255,255,255,.7); }
.section-dark .eyebrow { color: var(--c-accent-2); }

/* ---------- 数据条 ---------- */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.stat {
  text-align: center; padding: 40px 20px; border-radius: var(--radius);
  background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.12);
}
.stat b { display: block; font-size: var(--fs-stat); font-weight: var(--fw-h); color: #fff; letter-spacing: -1px; }
.stat b span { color: var(--c-accent-2); }
.stat i { font-style: normal; display: block; margin-top: 8px; color: rgba(255,255,255,.75); font-size: var(--fs-tag); letter-spacing: 1px; }

/* ---------- 卡片通用 ---------- */
.card {
  background: #fff; border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow-sm); border: 1px solid var(--c-line);
  transition: transform .3s, box-shadow .3s;
}
.card:hover { transform: translateY(-8px); box-shadow: var(--shadow); }
.card-img { position: relative; overflow: hidden; aspect-ratio: 4 / 3; background: var(--c-bg-soft); }
.card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s; }
.card:hover .card-img img { transform: scale(1.06); }
.card-body { padding: 22px 24px 26px; }

/* ---------- 服务卡片 ---------- */
.biz-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.service-card .card-img { aspect-ratio: 4 / 5; }
.service-card .card-body { position: relative; }
.svc-num {
  position: absolute; top: -58px; right: 20px; font-size: var(--fs-stat); font-weight: var(--fw-h);
  color: rgba(21,88,196,.14); letter-spacing: -2px;
}
.service-card h3 { font-size: var(--fs-h3); color: var(--c-dark); margin-bottom: 10px; }
.service-card p { color: var(--c-muted); font-size: var(--fs-card-meta); }

/* ---------- 关于/技术 ---------- */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.about-img { border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); aspect-ratio: 4 / 3; }
.about-img img { width: 100%; height: 100%; object-fit: cover; }
.about-text h3 { font-size: var(--fs-h3-about); color: var(--c-dark); margin-bottom: 16px; }
.about-text p { color: var(--c-muted); margin-bottom: 16px; }
.about-vision {
  margin-top: 24px; padding: 22px 26px; border-radius: var(--radius);
  background: linear-gradient(135deg, var(--c-primary), var(--c-primary-2)); color: #fff;
}
.about-vision b { font-size: var(--fs-h4-about); display: block; margin-bottom: 6px; }
.about-vision span { color: rgba(255,255,255,.85); }

.tech-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.tech-item { padding: 32px; border-radius: var(--radius); background: #fff; border: 1px solid var(--c-line); box-shadow: var(--shadow-sm); }
.tech-item h4 { font-size: var(--fs-h4); color: var(--c-dark); margin-bottom: 12px; display: flex; align-items: center; gap: 10px; }
.tech-item h4::before { content: ""; width: 12px; height: 12px; border-radius: 3px; background: var(--c-accent); }
.tech-item p { color: var(--c-muted); font-size: var(--fs-card-body); }

/* ---------- 产品卡片 ---------- */
.product-card .card-img { aspect-ratio: 1 / 1; }
.product-card .card-num {
  position: absolute; left: 14px; top: 14px; width: 34px; height: 34px; display: grid; place-items: center;
  background: rgba(255,255,255,.9); color: var(--c-primary-2); font-weight: 800; font-size: var(--fs-label); border-radius: 50%;
}
.product-card h3 { font-size: var(--fs-product-title); color: var(--c-dark); margin-bottom: 12px; }
.product-card .d-f, .product-card .d-p { font-size: var(--fs-label); color: var(--c-muted); margin-bottom: 8px; }
.product-card .d-f span, .product-card .d-p span {
  display: inline-block; margin-right: 8px; padding: 2px 8px; border-radius: 6px; font-size: var(--fs-tag-mini); font-weight: 700; vertical-align: 1px;
}
.product-card .d-f span { background: rgba(21,88,196,.10); color: var(--c-primary); }
.product-card .d-p span { background: rgba(255,122,24,.12); color: var(--c-accent); }
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }

/* ---------- 案例卡片 ---------- */
.case-card .card-img { aspect-ratio: 16 / 10; }
.case-card h3 { font-size: var(--fs-h3); color: var(--c-dark); margin-bottom: 10px; }
.case-card p { color: var(--c-muted); font-size: var(--fs-card-body); }
.case-card.is-big .card-img { aspect-ratio: 16 / 9; }

/* ---------- 优势 ---------- */
.adv-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.advantage-item { text-align: center; padding: 36px 20px; border-radius: var(--radius); background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.14); }
.adv-icon { width: 64px; height: 64px; margin: 0 auto 18px; border-radius: 50%; display: grid; place-items: center; background: linear-gradient(135deg, var(--c-accent), var(--c-accent-2)); }
.adv-icon::before { content: ""; width: 26px; height: 26px; border: 3px solid rgba(255,255,255,.9); border-radius: 50%; }
.advantage-item h4 { font-size: var(--fs-h4-adv); color: #fff; margin-bottom: 10px; }
.advantage-item p { color: rgba(255,255,255,.75); font-size: var(--fs-card-meta); }

/* ---------- 客户 ---------- */
.customers { display: flex; gap: 18px; flex-wrap: wrap; justify-content: center; }
.customer-chip {
  padding: 16px 34px; border-radius: 999px; background: #fff; border: 1px solid var(--c-line);
  color: var(--c-primary-2); font-weight: 700; font-size: var(--fs-customer); box-shadow: var(--shadow-sm); transition: transform .3s, box-shadow .3s;
}
.customer-chip:hover { transform: translateY(-5px); box-shadow: var(--shadow); }

/* ---------- 企业文化 ---------- */
.culture-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.culture-item { padding: 34px; border-radius: var(--radius); background: #fff; border: 1px solid var(--c-line); box-shadow: var(--shadow-sm); }
.culture-item h4 { font-size: var(--fs-h4); color: var(--c-primary-2); margin-bottom: 10px; }
.culture-item p { color: var(--c-muted); font-size: var(--fs-card-body); }
.motto-banner {
  margin-top: 34px; text-align: center; padding: 30px; border-radius: var(--radius);
  background: linear-gradient(135deg, var(--c-primary), var(--c-primary-2)); color: #fff;
}
.motto-banner b { font-size: var(--fs-motto); letter-spacing: 6px; }

/* ---------- 联系 ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1.1fr; gap: 46px; align-items: start; }
.contact-info h3 { font-size: var(--fs-h3-about); color: var(--c-dark); margin-bottom: 24px; }
.contact-row { display: flex; gap: 16px; padding: 20px 0; border-bottom: 1px solid var(--c-line); }
.contact-row .ci { width: 48px; height: 48px; flex: 0 0 48px; display: grid; place-items: center; border-radius: 12px; background: var(--c-primary); color: #fff; font-size: 18px; }
.contact-row .ct b { font-size: var(--fs-contact-label); color: var(--c-muted); font-weight: 600; display: block; margin-bottom: 4px; }
.contact-row .ct span { font-size: var(--fs-contact-value); color: var(--c-dark); font-weight: 700; }
.contact-form { padding: 34px; border-radius: var(--radius); background: #fff; box-shadow: var(--shadow); border: 1px solid var(--c-line); }
.contact-form h3 { font-size: var(--fs-h3-form); color: var(--c-dark); margin-bottom: 22px; }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: var(--fs-label); font-weight: 600; color: var(--c-text); margin-bottom: 8px; }
.form-group input, .form-group textarea {
  width: 100%; padding: 13px 16px; border-radius: 12px; border: 1.5px solid var(--c-line);
  font-size: var(--fs-form-input); font-family: var(--font); background: var(--c-bg-soft); transition: border .2s, box-shadow .2s;
}
.form-group input:focus, .form-group textarea:focus { outline: none; border-color: var(--c-primary-2); box-shadow: 0 0 0 4px rgba(46,123,219,.14); background: #fff; }
.form-hint { font-size: var(--fs-form-hint); color: var(--c-muted); margin-top: 12px; }

/* ---------- 页脚（浅色） ---------- */
.site-footer { background: #eef3fb; color: #44557a; margin-top: 80px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1.4fr; gap: 40px; padding: 64px 24px 40px; }
.footer-logo { display: block; height: 54px; width: auto; object-fit: contain; margin-bottom: 18px; }
.footer-brand p { font-size: var(--fs-footer); line-height: 1.8; }
.footer-slogan { color: var(--c-accent) !important; font-weight: 700; margin-top: 14px; }
.footer-col h4 { font-size: var(--fs-foot-h4); color: #16305e; margin-bottom: 18px; letter-spacing: 1px; }
.footer-links { display: flex; flex-direction: column; gap: 12px; }
.footer-links a { font-size: var(--fs-footer); transition: color .2s; }
.footer-links a:hover { color: var(--c-primary); }
.footer-contact li { display: flex; gap: 12px; font-size: var(--fs-footer); margin-bottom: 12px; line-height: 1.6; }
.footer-contact i { color: var(--c-primary); margin-top: 3px; min-width: 16px; }
.footer-bottom { border-top: 1px solid #dbe4f2; padding: 20px 24px; }
.footer-bottom .container { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; font-size: var(--fs-foot-bottom); color: #8a97b1; }

/* ---------- 滚动显现 ---------- */
.reveal-ready { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
.reveal-in { opacity: 1; transform: none; }

/* ---------- 页内 hero ---------- */
.page-hero { position: relative; color: #fff; padding: 140px 0 90px; overflow: hidden; }
.page-hero .hero-bg::before { background: linear-gradient(120deg, rgba(13,50,110,.82), rgba(21,88,196,.42)); }
.page-hero h1 { font-size: clamp(var(--fs-page-h1min), 4.5vw, var(--fs-page-h1max)); font-weight: var(--fw-h); }
.page-hero p { margin-top: 14px; color: rgba(255,255,255,.82); max-width: 620px; }
.crumbs { font-size: var(--fs-eyebrow); color: rgba(255,255,255,.7); margin-bottom: 18px; }
.crumbs a:hover { color: var(--c-accent-2); }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .biz-grid, .adv-grid { grid-template-columns: repeat(2, 1fr); }
  .grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 820px) {
  .site-nav {
    position: fixed; top: 76px; right: 0; flex-direction: column; gap: 8px;
    background: #fff; width: 260px; padding: 24px; height: calc(100vh - 76px);
    box-shadow: -20px 0 40px rgba(0,0,0,.1); transform: translateX(105%); transition: .35s; margin-left: 0;
  }
  .site-nav.open { transform: translateX(0); }
  .header-cta { display: none; }
  .nav-toggle { display: block; margin-left: auto; }
  .nav-toggle.active span:nth-child(1) { top: 21px; transform: rotate(45deg); }
  .nav-toggle.active span:nth-child(2) { opacity: 0; }
  .nav-toggle.active span:nth-child(3) { top: 21px; transform: rotate(-45deg); }
  .about-grid, .culture-grid, .contact-grid { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .tech-grid { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .grid, .biz-grid, .adv-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero { min-height: 96vh; }
  .hero-content { padding: 100px 0 70px; }
  .section { padding: 64px 0; }
  .stats b { font-size: var(--fs-stat-mobile); }
  .motto-banner b { font-size: var(--fs-motto-mobile); letter-spacing: 3px; }
}