@charset "utf-8";
/* =============================================================
   布兰特 BRANT · 官网样式表
   配色：科技蓝（主） + 宝红（辅）   风格：简约大气 · 软件 SaaS
   ============================================================= */

/* ---------- 1. 设计变量 ---------- */
:root {
  /* 主色：科技蓝 */
  --blue-900: #061733;
  --blue-800: #0a2456;
  --blue-700: #0b3fb8;
  --blue-600: #1258e6;
  --blue-500: #2a7bff;
  --blue-300: #8fbaff;
  --blue-100: #e4eeff;
  --blue-50:  #f3f7ff;

  /* 辅色：宝红 */
  --red-700: #9d0f28;
  --red-600: #c8102e;
  --red-500: #e11d3c;
  --red-100: #fdeaee;
  --red-50:  #fff5f7;

  /* 中性色 */
  --ink:    #0f1b33;
  --ink-2:  #333f57;
  --ink-3:  #6a758c;
  --ink-4:  #98a2b6;
  --line:   #e8ecf4;
  --line-2: #d9e0ec;
  --bg:     #ffffff;
  --bg-soft:#f5f7fb;
  --bg-deep:#f0f3f9;

  /* 尺寸与效果 */
  --radius:    14px;
  --radius-lg: 20px;
  --radius-pill: 999px;
  --maxw: 1240px;
  --nav-h: 72px;
  --shadow-sm: 0 1px 2px rgba(15,27,51,.04), 0 4px 14px rgba(15,27,51,.05);
  --shadow-md: 0 8px 28px rgba(15,27,51,.08);
  --shadow-lg: 0 26px 60px rgba(10,36,86,.16);
  --shadow-red: 0 12px 28px rgba(200,16,46,.24);
  --ease: cubic-bezier(.22,.61,.36,1);
}

/* ---------- 2. 基础重置 ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei",
               -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-2);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, h5 { margin: 0; color: var(--ink); font-weight: 700; line-height: 1.3; letter-spacing: -.01em; }
p { margin: 0; }
button { font-family: inherit; cursor: pointer; }

/* 焦点可见性（无障碍） */
:focus-visible { outline: 2px solid var(--blue-600); outline-offset: 3px; border-radius: 4px; }

/* ---------- 3. 布局工具类 ---------- */
.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.section { padding: 96px 0; }
.section--soft { background: var(--bg-soft); }
.section--sm { padding: 64px 0; }

.section-head { max-width: 780px; margin: 0 auto 56px; text-align: center; }
.section-head--left { margin-left: 0; text-align: left; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 12px; font-weight: 700; letter-spacing: .16em;
  text-transform: uppercase; color: var(--blue-600); margin-bottom: 14px;
}
.eyebrow::before { content: ""; width: 22px; height: 2px; background: var(--red-600); border-radius: 2px; }
.eyebrow--red { color: var(--red-600); }
.eyebrow--red::before { background: var(--blue-600); }
.section-title { font-size: 34px; margin-bottom: 14px; }
.section-desc { font-size: 15.5px; color: var(--ink-3); }

/* ---------- 4. 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 46px; padding: 0 26px; border: 1px solid transparent; border-radius: var(--radius-pill);
  font-size: 15px; font-weight: 600; white-space: nowrap;
  transition: transform .25s var(--ease), box-shadow .25s var(--ease), background .25s var(--ease), color .25s var(--ease);
}
.btn svg { width: 16px; height: 16px; flex: none; }
.btn--primary { background: linear-gradient(135deg, var(--blue-600), var(--blue-500)); color: #fff; box-shadow: 0 8px 20px rgba(18,88,230,.26); }
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 14px 30px rgba(18,88,230,.34); }
.btn--red { background: linear-gradient(135deg, var(--red-700), var(--red-500)); color: #fff; box-shadow: var(--shadow-red); }
.btn--red:hover { transform: translateY(-2px); box-shadow: 0 16px 34px rgba(200,16,46,.32); }
.btn--ghost { background: rgba(255,255,255,.06); border-color: rgba(255,255,255,.34); color: #fff; }
.btn--ghost:hover { background: rgba(255,255,255,.14); transform: translateY(-2px); }
.btn--outline { background: #fff; border-color: var(--line-2); color: var(--ink); }
.btn--outline:hover { border-color: var(--blue-500); color: var(--blue-600); transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.btn--sm { height: 38px; padding: 0 18px; font-size: 14px; }

/* 文字链接 */
.link-more { display: inline-flex; align-items: center; gap: 6px; font-size: 14px; font-weight: 600; color: var(--blue-600); }
.link-more svg { width: 15px; height: 15px; transition: transform .25s var(--ease); }
.link-more:hover svg { transform: translateX(4px); }

/* ---------- 5. 顶部导航 ---------- */
.topbar {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  background: rgba(255,255,255,.86);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--line);
  transition: box-shadow .3s var(--ease);
}
.topbar.is-stuck { box-shadow: 0 6px 24px rgba(15,27,51,.07); }
.topbar__inner { height: var(--nav-h); display: flex; align-items: center; gap: 32px; }

.logo { display: flex; align-items: center; gap: 10px; flex: none; }
.logo__mark {
  width: 34px; height: 34px; border-radius: 9px; flex: none;
  background: linear-gradient(135deg, var(--blue-600), var(--blue-800));
  display: grid; place-items: center; color: #fff; font-weight: 800; font-size: 17px;
  box-shadow: 0 6px 16px rgba(18,88,230,.3);
  position: relative; overflow: hidden;
}
.logo__mark::after {
  content: ""; position: absolute; right: -6px; bottom: -6px;
  width: 16px; height: 16px; border-radius: 50%; background: var(--red-600); opacity: .95;
}
.logo__text { line-height: 1.15; }
.logo__cn { display: block; font-size: 17px; font-weight: 800; color: var(--ink); letter-spacing: .04em; }
.logo__en { display: block; font-size: 10px; font-weight: 600; letter-spacing: .22em; color: var(--ink-4); text-transform: uppercase; }

.nav { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.nav__item { position: relative; }
.nav__link {
  display: flex; align-items: center; gap: 5px;
  height: var(--nav-h); padding: 0 16px;
  font-size: 15px; font-weight: 600; color: var(--ink-2);
  transition: color .2s var(--ease);
}
.nav__link:hover, .nav__item.is-open > .nav__link { color: var(--blue-600); }
.nav__link.is-active { color: var(--blue-600); }
.nav__link.is-active::after {
  content: ""; position: absolute; left: 16px; right: 16px; bottom: 16px;
  height: 2px; border-radius: 2px; background: linear-gradient(90deg, var(--blue-600), var(--red-600));
}
.nav__caret { width: 12px; height: 12px; transition: transform .25s var(--ease); }
.nav__item.is-open .nav__caret { transform: rotate(180deg); }

/* 下拉菜单 */
.dropdown {
  position: absolute; top: calc(var(--nav-h) - 8px); left: 50%; transform: translate(-50%, 8px);
  min-width: 208px; padding: 10px; background: #fff;
  border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  opacity: 0; visibility: hidden; pointer-events: none;
  transition: opacity .22s var(--ease), transform .22s var(--ease), visibility .22s;
}
.nav__item.is-open .dropdown { opacity: 1; visibility: visible; pointer-events: auto; transform: translate(-50%, 0); }
.dropdown__link {
  display: block; padding: 10px 14px; border-radius: 9px;
  font-size: 14.5px; color: var(--ink-2); transition: background .2s var(--ease), color .2s var(--ease);
}
.dropdown__link:hover { background: var(--blue-50); color: var(--blue-600); }
.dropdown__link small { display: block; font-size: 12px; color: var(--ink-4); font-weight: 400; }

.topbar__cta { display: flex; align-items: center; gap: 12px; flex: none; }
.topbar__tel { display: flex; align-items: center; gap: 7px; font-size: 14.5px; font-weight: 700; color: var(--ink); }
.topbar__tel svg { width: 16px; height: 16px; color: var(--red-600); }

/* 汉堡按钮 */
.nav-toggle { display: none; width: 42px; height: 42px; border: 1px solid var(--line-2); border-radius: 10px; background: #fff; }
.nav-toggle span { display: block; width: 18px; height: 2px; margin: 3px auto; background: var(--ink); border-radius: 2px; transition: transform .25s var(--ease), opacity .2s; }
.topbar.is-open .nav-toggle span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.topbar.is-open .nav-toggle span:nth-child(2) { opacity: 0; }
.topbar.is-open .nav-toggle span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

/* ---------- 6. Hero ---------- */
.hero {
  position: relative; overflow: hidden;
  padding: calc(var(--nav-h) + 96px) 0 120px;
  background: linear-gradient(160deg, #071b3f 0%, #0a2a63 46%, #10357e 100%);
  color: #fff;
}
.hero::before { /* 网格纹理 */
  content: ""; position: absolute; inset: 0;
  background-image: linear-gradient(rgba(255,255,255,.055) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(255,255,255,.055) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 80% 70% at 30% 40%, #000 40%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 30% 40%, #000 40%, transparent 100%);
}
.hero::after { /* 宝红光晕 */
  content: ""; position: absolute; width: 620px; height: 620px; right: -160px; top: -220px;
  background: radial-gradient(circle, rgba(225,29,60,.30), transparent 62%);
  filter: blur(10px); pointer-events: none;
}
.hero > * { position: relative; z-index: 1; }
.hero__grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 64px; align-items: center; }
.hero__badge {
  display: inline-flex; align-items: center; gap: 8px; height: 32px; padding: 0 14px;
  border: 1px solid rgba(255,255,255,.24); border-radius: var(--radius-pill);
  background: rgba(255,255,255,.08);
  font-size: 13px; font-weight: 600; letter-spacing: .02em;
}
.hero__badge i { width: 6px; height: 6px; border-radius: 50%; background: var(--red-500); box-shadow: 0 0 0 4px rgba(225,29,60,.24); }
.hero__title { margin: 26px 0 20px; font-size: 50px; line-height: 1.18; color: #fff; letter-spacing: -.02em; }
.hero__title em { font-style: normal; background: linear-gradient(100deg, #ffd9df, var(--red-500)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero__desc { max-width: 540px; font-size: 16.5px; line-height: 1.85; color: rgba(255,255,255,.78); }
.hero__actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 38px; }

.hero__chips { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 34px; }
.chip {
  display: inline-flex; align-items: center; gap: 7px; height: 32px; padding: 0 14px;
  border-radius: var(--radius-pill); background: rgba(255,255,255,.09);
  border: 1px solid rgba(255,255,255,.16); font-size: 13px; color: rgba(255,255,255,.9);
}
.chip svg { width: 14px; height: 14px; color: var(--blue-300); }

/* Hero 软件界面示意 */
.hero-card {
  background: rgba(255,255,255,.98); border-radius: 18px; overflow: hidden;
  box-shadow: 0 40px 90px rgba(0,0,0,.4); border: 1px solid rgba(255,255,255,.5);
}
.hero-card__bar { display: flex; align-items: center; gap: 7px; height: 40px; padding: 0 14px; background: #f2f5fa; border-bottom: 1px solid var(--line); }
.hero-card__bar i { width: 10px; height: 10px; border-radius: 50%; background: #d7dde8; }
.hero-card__bar i:nth-child(1) { background: #ff5f57; }
.hero-card__bar i:nth-child(2) { background: #febc2e; }
.hero-card__bar i:nth-child(3) { background: #28c840; }
.hero-card__bar span { margin-left: 8px; font-size: 12px; color: var(--ink-4); font-weight: 600; }
.hero-card__body { padding: 20px; }
.hero-card__tabs { display: flex; gap: 6px; margin-bottom: 16px; }
.hero-card__tabs b { padding: 5px 12px; border-radius: 7px; font-size: 12.5px; font-weight: 600; color: var(--ink-3); background: #f2f5fa; }
.hero-card__tabs b.on { background: var(--blue-100); color: var(--blue-700); }
.hero-card__kpis { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-bottom: 16px; }
.hero-card__kpi { padding: 12px; border: 1px solid var(--line); border-radius: 10px; background: #fff; }
.hero-card__kpi small { display: block; font-size: 11.5px; color: var(--ink-4); }
.hero-card__kpi strong { font-size: 20px; color: var(--ink); }
.hero-card__kpi strong.red { color: var(--red-600); }
.hero-card__chart { height: 118px; display: flex; align-items: flex-end; gap: 8px; padding: 12px; border: 1px solid var(--line); border-radius: 10px; background: linear-gradient(180deg, #fff, var(--blue-50)); }
.hero-card__chart i { flex: 1; border-radius: 4px 4px 0 0; background: linear-gradient(180deg, var(--blue-500), var(--blue-700)); }
.hero-card__chart i.hot { background: linear-gradient(180deg, var(--red-500), var(--red-700)); }
.hero-card__rows { margin-top: 14px; display: grid; gap: 8px; }
.hero-card__row { display: flex; align-items: center; gap: 10px; font-size: 12.5px; color: var(--ink-3); }
.hero-card__row b { margin-left: auto; font-size: 12px; padding: 2px 9px; border-radius: var(--radius-pill); }
.tag-red { background: var(--red-50); color: var(--red-600); }
.tag-blue { background: var(--blue-50); color: var(--blue-700); }
.tag-ok { background: #eafaf0; color: #12874b; }

/* ---------- 7. 数据条 ---------- */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-sm); }
.stat { padding: 34px 26px; background: #fff; text-align: center; }
.stat strong { display: block; font-size: 38px; font-weight: 800; color: var(--blue-700); line-height: 1.1; letter-spacing: -.02em; }
.stat strong em { font-style: normal; font-size: 22px; color: var(--red-600); }
.stat span { display: block; margin-top: 8px; font-size: 14px; color: var(--ink-3); }

/* ---------- 8. 产品卡片 ---------- */
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }

.card {
  position: relative; padding: 30px 26px 28px; background: #fff;
  border: 1px solid var(--line); border-radius: var(--radius-lg);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s var(--ease);
  overflow: hidden;
}
.card::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 3px;
  background: linear-gradient(90deg, var(--blue-600), var(--red-500));
  transform: scaleX(0); transform-origin: left; transition: transform .35s var(--ease);
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); border-color: var(--line-2); }
.card:hover::before { transform: scaleX(1); }
.card__icon {
  width: 50px; height: 50px; border-radius: 13px; display: grid; place-items: center;
  background: linear-gradient(135deg, var(--blue-50), var(--blue-100)); color: var(--blue-600);
  margin-bottom: 20px; transition: background .3s var(--ease), color .3s var(--ease);
}
.card:hover .card__icon { background: linear-gradient(135deg, var(--blue-600), var(--blue-800)); color: #fff; }
.card__icon svg { width: 25px; height: 25px; }
.card h3 { font-size: 18.5px; margin-bottom: 6px; }
.card__sub { font-size: 12.5px; font-weight: 600; letter-spacing: .06em; color: var(--red-600); text-transform: uppercase; margin-bottom: 12px; }
.card p { font-size: 14.5px; color: var(--ink-3); }
.card__list { margin-top: 18px; display: grid; gap: 9px; }
.card__list li { display: flex; gap: 9px; font-size: 14px; color: var(--ink-2); }
.card__list svg { width: 16px; height: 16px; flex: none; margin-top: 5px; color: var(--blue-600); }
.card__foot { margin-top: 22px; padding-top: 18px; border-top: 1px dashed var(--line-2); }

/* ---------- 9. 行业解决方案 ---------- */
.industry {
  position: relative; min-height: 208px; padding: 26px; border-radius: var(--radius-lg);
  background: var(--blue-800); color: #fff; overflow: hidden;
  display: flex; flex-direction: column; justify-content: flex-end;
  transition: transform .3s var(--ease), box-shadow .3s var(--ease);
}
.industry::before {
  content: ""; position: absolute; inset: 0;
  background-image: linear-gradient(rgba(255,255,255,.07) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(255,255,255,.07) 1px, transparent 1px);
  background-size: 26px 26px;
}
.industry::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(6,23,51,.1), rgba(6,23,51,.85));
}
.industry > * { position: relative; z-index: 1; }
.industry:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.industry__no { position: absolute; top: 20px; right: 24px; z-index: 1; font-size: 34px; font-weight: 800; color: rgba(255,255,255,.2); letter-spacing: -.03em; }
.industry h3 { font-size: 19px; color: #fff; margin-bottom: 8px; }
.industry p { font-size: 14px; color: rgba(255,255,255,.72); }
.industry__tags { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 14px; }
.industry__tags b { font-size: 12px; font-weight: 500; padding: 3px 10px; border-radius: var(--radius-pill); background: rgba(255,255,255,.14); color: rgba(255,255,255,.9); }
/* 各行业的底图色（纯 CSS，无外链图片） */
.industry--auto  { background: linear-gradient(140deg, #0b3fb8, #061733); }
.industry--ne    { background: linear-gradient(140deg, #c8102e, #5c0a17); }
.industry--rail  { background: linear-gradient(140deg, #1258e6, #072a66); }
.industry--aero  { background: linear-gradient(140deg, #1c2f57, #060f22); }
.industry--semi  { background: linear-gradient(140deg, #2a7bff, #0a2456); }
.industry--mfg   { background: linear-gradient(140deg, #8f1735, #2a0710); }

/* ---------- 10. 客户墙 ---------- */
.logowall { display: grid; grid-template-columns: repeat(6, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius-lg); overflow: hidden; }
.logowall div {
  height: 92px; display: grid; place-items: center; background: #fff;
  font-size: 15px; font-weight: 700; color: var(--ink-3); letter-spacing: .02em;
  transition: background .25s var(--ease), color .25s var(--ease);
}
.logowall div:hover { background: var(--blue-50); color: var(--blue-700); }

/* ---------- 11. 案例卡 ---------- */
.case {
  display: flex; flex-direction: column; background: #fff;
  border: 1px solid var(--line); border-radius: var(--radius-lg); overflow: hidden;
  transition: transform .3s var(--ease), box-shadow .3s var(--ease);
}
.case:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
.case__thumb { height: 168px; position: relative; overflow: hidden; }
.case__thumb::before {
  content: ""; position: absolute; inset: 0;
  background-image: linear-gradient(rgba(255,255,255,.09) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(255,255,255,.09) 1px, transparent 1px);
  background-size: 24px 24px;
}
.case__thumb span {
  position: absolute; left: 18px; bottom: 16px; z-index: 1;
  font-size: 12.5px; font-weight: 700; letter-spacing: .08em; color: rgba(255,255,255,.92);
  padding: 4px 12px; border-radius: var(--radius-pill); background: rgba(255,255,255,.16);
  border: 1px solid rgba(255,255,255,.24); backdrop-filter: blur(4px);
}
.case--blue .case__thumb { background: linear-gradient(140deg, #1258e6, #072a66); }
.case--red  .case__thumb { background: linear-gradient(140deg, #c8102e, #5c0a17); }
.case--dark .case__thumb { background: linear-gradient(140deg, #1c2f57, #060f22); }
.case__body { padding: 24px 24px 26px; display: flex; flex-direction: column; flex: 1; }
.case__body h3 { font-size: 17.5px; margin-bottom: 10px; }
.case__body p { font-size: 14px; color: var(--ink-3); flex: 1; }
.case__metrics { display: flex; gap: 20px; margin-top: 18px; padding-top: 16px; border-top: 1px dashed var(--line-2); }
.case__metrics div strong { display: block; font-size: 19px; color: var(--red-600); line-height: 1.2; }
.case__metrics div span { font-size: 12.5px; color: var(--ink-4); }

/* ---------- 12. 新闻 ---------- */
.news { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.news-item {
  display: block; background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg);
  padding: 26px 24px; transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s;
}
.news-item:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); border-color: var(--line-2); }
.news-item time { display: inline-block; font-size: 12.5px; font-weight: 700; color: var(--red-600); letter-spacing: .04em; }
.news-item h3 { margin: 12px 0 10px; font-size: 17px; line-height: 1.5; transition: color .25s var(--ease); }
.news-item:hover h3 { color: var(--blue-600); }
.news-item p { font-size: 14px; color: var(--ink-3); }
.news-list { display: grid; gap: 0; border-top: 1px solid var(--line); }
.news-row {
  display: grid; grid-template-columns: 132px 1fr auto; gap: 28px; align-items: center;
  padding: 26px 8px; border-bottom: 1px solid var(--line); transition: background .25s var(--ease);
}
.news-row:hover { background: var(--blue-50); }
.news-row__date { display: grid; gap: 2px; }
.news-row__date b { font-size: 26px; font-weight: 800; color: var(--blue-700); line-height: 1; }
.news-row__date span { font-size: 12.5px; color: var(--ink-4); }
.news-row h3 { font-size: 17.5px; margin-bottom: 6px; }
.news-row p { font-size: 14px; color: var(--ink-3); }

/* ---------- 13. 发展历程（时间轴） ---------- */
.timeline { position: relative; padding-left: 34px; }
.timeline::before { content: ""; position: absolute; left: 9px; top: 8px; bottom: 8px; width: 2px; background: linear-gradient(180deg, var(--blue-500), var(--red-500)); border-radius: 2px; }
.tl-item { position: relative; padding-bottom: 34px; }
.tl-item:last-child { padding-bottom: 0; }
.tl-item::before {
  content: ""; position: absolute; left: -34px; top: 8px; width: 20px; height: 20px; border-radius: 50%;
  background: #fff; border: 3px solid var(--blue-600); box-shadow: 0 0 0 4px var(--blue-100);
}
.tl-item.is-key::before { border-color: var(--red-600); box-shadow: 0 0 0 4px var(--red-100); }
.tl-year { font-size: 22px; font-weight: 800; color: var(--blue-700); letter-spacing: -.01em; }
.tl-item.is-key .tl-year { color: var(--red-600); }
.tl-item h4 { font-size: 16.5px; margin: 4px 0 6px; }
.tl-item p { font-size: 14.5px; color: var(--ink-3); }

/* ---------- 14. 资质荣誉 ---------- */
.certs { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.cert {
  padding: 26px 22px; text-align: center; background: #fff;
  border: 1px solid var(--line); border-radius: var(--radius);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s;
}
.cert:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); border-color: var(--blue-300); }
.cert__seal {
  width: 76px; height: 76px; margin: 0 auto 16px; border-radius: 50%;
  display: grid; place-items: center;
  background: radial-gradient(circle at 32% 28%, #fff, var(--blue-100) 70%, #d8e6ff);
  border: 2px solid #fff; box-shadow: 0 6px 18px rgba(18,88,230,.16);
  font-size: 11px; font-weight: 800; color: var(--blue-700); line-height: 1.25; letter-spacing: .02em;
}
.cert--red .cert__seal {
  background: radial-gradient(circle at 32% 28%, #fff, var(--red-100) 70%, #ffd6dd);
  color: var(--red-700); box-shadow: 0 6px 18px rgba(200,16,46,.16);
}
.cert h4 { font-size: 15.5px; margin-bottom: 4px; }
.cert p { font-size: 13px; color: var(--ink-4); }

/* ---------- 15. 优势 / 特性条 ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; }
.feature-list { display: grid; gap: 20px; margin-top: 28px; }
.feature { display: flex; gap: 16px; }
.feature__ico {
  width: 44px; height: 44px; flex: none; border-radius: 12px; display: grid; place-items: center;
  background: #fff; border: 1px solid var(--line); color: var(--blue-600); box-shadow: var(--shadow-sm);
}
.feature__ico svg { width: 22px; height: 22px; }
.feature h4 { font-size: 16.5px; margin-bottom: 5px; }
.feature p { font-size: 14px; color: var(--ink-3); }

/* 可视化面板 */
.vpanel {
  position: relative; padding: 28px; border-radius: var(--radius-lg);
  background: linear-gradient(150deg, #0a2a63, #061733); color: #fff; overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.vpanel::before {
  content: ""; position: absolute; inset: 0;
  background-image: linear-gradient(rgba(255,255,255,.06) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(255,255,255,.06) 1px, transparent 1px);
  background-size: 30px 30px;
}
.vpanel > * { position: relative; z-index: 1; }
.vpanel h4 { color: #fff; font-size: 17px; margin-bottom: 20px; }
.vbar { margin-bottom: 16px; }
.vbar__top { display: flex; justify-content: space-between; font-size: 13.5px; margin-bottom: 7px; color: rgba(255,255,255,.86); }
.vbar__track { height: 8px; border-radius: 4px; background: rgba(255,255,255,.14); overflow: hidden; }
.vbar__fill { height: 100%; border-radius: 4px; background: linear-gradient(90deg, var(--blue-500), var(--blue-300)); width: 0; transition: width 1.4s var(--ease); }
.vbar--red .vbar__fill { background: linear-gradient(90deg, var(--red-600), #ff8095); }

/* ---------- 16. 页面横幅（内页） ---------- */
.pagebanner {
  position: relative; overflow: hidden;
  padding: calc(var(--nav-h) + 76px) 0 76px;
  background: linear-gradient(140deg, #071b3f, #0a2a63 60%, #123a86);
  color: #fff;
}
.pagebanner::before {
  content: ""; position: absolute; inset: 0;
  background-image: linear-gradient(rgba(255,255,255,.05) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(255,255,255,.05) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 70% 90% at 20% 50%, #000, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 70% 90% at 20% 50%, #000, transparent 100%);
}
.pagebanner::after { content: ""; position: absolute; width: 460px; height: 460px; right: -120px; top: -180px; background: radial-gradient(circle, rgba(225,29,60,.26), transparent 62%); }
.pagebanner > * { position: relative; z-index: 1; }
.pagebanner h1 { font-size: 40px; color: #fff; margin-bottom: 12px; }
.pagebanner p { font-size: 16px; color: rgba(255,255,255,.74); max-width: 640px; }
.crumb { display: flex; align-items: center; gap: 8px; font-size: 13.5px; color: rgba(255,255,255,.62); margin-bottom: 18px; }
.crumb a:hover { color: #fff; }
.crumb svg { width: 13px; height: 13px; }

/* ---------- 17. 联系与表单 ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1.15fr; gap: 56px; align-items: start; }
.info-line { display: flex; gap: 16px; padding: 20px 0; border-bottom: 1px solid var(--line); }
.info-line:last-of-type { border-bottom: 0; }
.info-line__ico { width: 42px; height: 42px; flex: none; border-radius: 11px; display: grid; place-items: center; background: var(--blue-50); color: var(--blue-600); }
.info-line__ico svg { width: 20px; height: 20px; }
.info-line__ico--red { background: var(--red-50); color: var(--red-600); }
.info-line small { display: block; font-size: 12.5px; color: var(--ink-4); }
.info-line strong { font-size: 16px; color: var(--ink); font-weight: 700; }

.form-card { padding: 36px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg); box-shadow: var(--shadow-md); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 13.5px; font-weight: 600; color: var(--ink-2); margin-bottom: 7px; }
.field label i { color: var(--red-600); font-style: normal; }
.field input, .field select, .field textarea {
  width: 100%; padding: 11px 14px; font-family: inherit; font-size: 14.5px; color: var(--ink);
  background: #fff; border: 1px solid var(--line-2); border-radius: 10px;
  transition: border-color .2s var(--ease), box-shadow .2s var(--ease);
}
.field textarea { min-height: 108px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--blue-500); box-shadow: 0 0 0 3px rgba(42,123,255,.14);
}
.field .err { display: none; margin-top: 6px; font-size: 12.5px; color: var(--red-600); }
.field.is-error input, .field.is-error textarea { border-color: var(--red-500); }
.field.is-error .err { display: block; }
.form-note { margin-top: 14px; font-size: 12.5px; color: var(--ink-4); }
.form-msg { display: none; margin-top: 16px; padding: 12px 16px; border-radius: 10px; font-size: 14px; background: var(--blue-50); color: var(--blue-700); border: 1px solid var(--blue-100); }
.form-msg.is-show { display: block; }

/* ---------- 18. CTA ---------- */
.cta {
  position: relative; overflow: hidden; padding: 68px 0;
  background: linear-gradient(120deg, var(--blue-700), var(--blue-900) 55%, #2c0a14 130%);
  color: #fff; text-align: center;
}
.cta::before {
  content: ""; position: absolute; inset: 0;
  background-image: linear-gradient(rgba(255,255,255,.05) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(255,255,255,.05) 1px, transparent 1px);
  background-size: 40px 40px;
}
.cta > * { position: relative; z-index: 1; }
.cta h2 { font-size: 32px; color: #fff; margin-bottom: 12px; }
.cta p { color: rgba(255,255,255,.76); margin-bottom: 30px; }
.cta__actions { display: flex; justify-content: center; gap: 14px; flex-wrap: wrap; }

/* ---------- 19. 页脚 ---------- */
.footer { background: #061733; color: rgba(255,255,255,.66); padding: 66px 0 0; }
.footer__grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr 1.2fr; gap: 40px; padding-bottom: 44px; }
.footer h4 { color: #fff; font-size: 15.5px; margin-bottom: 18px; }
.footer li { margin-bottom: 11px; font-size: 14px; }
.footer li a:hover { color: #fff; }
.footer__about p { font-size: 14px; line-height: 1.9; margin: 18px 0 20px; }
.footer .logo__cn { color: #fff; }
.footer .logo__en { color: rgba(255,255,255,.42); }
.socials { display: flex; gap: 10px; }
.socials a {
  width: 36px; height: 36px; border-radius: 10px; display: grid; place-items: center;
  border: 1px solid rgba(255,255,255,.16); color: rgba(255,255,255,.8);
  transition: background .25s var(--ease), border-color .25s var(--ease), transform .25s var(--ease);
}
.socials a:hover { background: var(--blue-600); border-color: var(--blue-600); transform: translateY(-3px); }
.socials svg { width: 17px; height: 17px; }
.qrbox { display: flex; gap: 14px; }
.qr {
  width: 92px; height: 92px; border-radius: 10px; padding: 7px; background: #fff;
  display: grid; place-items: center; flex: none;
}
.qr svg { width: 100%; height: 100%; }
.qrbox div span { display: block; font-size: 13px; color: rgba(255,255,255,.8); margin-bottom: 4px; }
.qrbox div small { font-size: 12px; color: rgba(255,255,255,.42); }
.footer__bottom { border-top: 1px solid rgba(255,255,255,.1); padding: 22px 0; display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; font-size: 13px; }
.footer__bottom a:hover { color: #fff; }
.footer__links { display: flex; gap: 20px; }

/* ---------- 20. 回到顶部 ---------- */
.totop {
  position: fixed; right: 26px; bottom: 26px; z-index: 90;
  width: 44px; height: 44px; border-radius: 12px; border: 0;
  background: linear-gradient(135deg, var(--blue-600), var(--blue-800)); color: #fff;
  display: grid; place-items: center; box-shadow: 0 10px 26px rgba(18,88,230,.36);
  opacity: 0; visibility: hidden; transform: translateY(10px);
  transition: opacity .28s var(--ease), visibility .28s, transform .28s var(--ease);
}
.totop.is-show { opacity: 1; visibility: visible; transform: translateY(0); }
.totop svg { width: 18px; height: 18px; }

/* ---------- 21. 滚动进场动画 ---------- */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.is-in { opacity: 1; transform: none; }
.reveal--d1 { transition-delay: .09s; }
.reveal--d2 { transition-delay: .18s; }
.reveal--d3 { transition-delay: .27s; }
.reveal--d4 { transition-delay: .36s; }

/* ---------- 22. 筛选器 ---------- */
.filter { display: flex; flex-wrap: wrap; gap: 10px; margin: 0 0 32px; }
.filter__btn {
  height: 38px; padding: 0 20px; border: 1px solid var(--line-2); border-radius: var(--radius-pill);
  background: #fff; font-size: 14.5px; font-weight: 600; color: var(--ink-2);
  transition: background .25s var(--ease), color .25s var(--ease), border-color .25s var(--ease), transform .2s var(--ease);
}
.filter__btn:hover { border-color: var(--blue-500); color: var(--blue-600); transform: translateY(-2px); }
.filter__btn.is-on {
  background: linear-gradient(135deg, var(--blue-600), var(--blue-500));
  border-color: transparent; color: #fff; box-shadow: 0 8px 20px rgba(18,88,230,.24);
}
.filter__empty { padding: 40px 0; text-align: center; font-size: 15px; color: var(--ink-3); }

/* ---------- 23. 分页 ---------- */
.pager { display: flex; justify-content: center; gap: 8px; margin-top: 48px; }
.pager__btn {
  min-width: 40px; height: 40px; padding: 0 12px; display: grid; place-items: center;
  border: 1px solid var(--line-2); border-radius: 10px; background: #fff;
  font-size: 14.5px; font-weight: 600; color: var(--ink-2);
  transition: background .25s var(--ease), color .25s var(--ease), border-color .25s var(--ease);
}
.pager__btn svg { width: 15px; height: 15px; }
.pager__btn:hover { border-color: var(--blue-500); color: var(--blue-600); }
.pager__btn.is-current { background: var(--blue-600); border-color: var(--blue-600); color: #fff; }

/* ---------- 24. 常见问题（原生 details 折叠） ---------- */
.faq { display: grid; gap: 12px; }
.faq__item { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.faq__item summary {
  list-style: none; cursor: pointer; padding: 18px 22px;
  font-size: 16.5px; font-weight: 700; color: var(--ink);
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  transition: background .25s var(--ease), color .25s var(--ease);
}
.faq__item summary::-webkit-details-marker { display: none; }
.faq__item summary::after {
  content: ""; width: 10px; height: 10px; flex: none; margin-right: 4px;
  border-right: 2px solid var(--blue-600); border-bottom: 2px solid var(--blue-600);
  transform: rotate(45deg); transition: transform .3s var(--ease);
}
.faq__item[open] summary::after { transform: rotate(-135deg); }
.faq__item summary:hover { background: var(--blue-50); color: var(--blue-700); }
.faq__item p { padding: 0 22px 20px; font-size: 14.5px; color: var(--ink-3); }

/* ---------- 25. 响应式 ---------- */
@media (max-width: 1080px) {
  .nav { display: none; }
  .nav-toggle { display: block; margin-left: auto; }
  .topbar__cta { display: none; }
  /* 移动端抽屉菜单 */
  .topbar.is-open .nav {
    display: block; position: absolute; top: var(--nav-h); left: 0; right: 0;
    max-height: calc(100dvh - var(--nav-h)); overflow-y: auto;
    padding: 12px 20px 22px; background: #fff; border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow-md);
  }
  .topbar.is-open .nav__item { border-bottom: 1px solid var(--line); }
  .topbar.is-open .nav__link { height: auto; padding: 14px 0; }
  .topbar.is-open .nav__link.is-active::after { display: none; }
  .topbar.is-open .dropdown {
    position: static; transform: none; opacity: 1; visibility: visible; pointer-events: auto;
    min-width: 0; box-shadow: none; border: 0; padding: 0 0 10px; background: transparent;
  }
  .hero__grid { grid-template-columns: 1fr; gap: 52px; }
  .hero__title { font-size: 38px; }
  .grid-4, .certs { grid-template-columns: repeat(2, 1fr); }
  .grid-3, .news { grid-template-columns: repeat(2, 1fr); }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .split, .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .logowall { grid-template-columns: repeat(3, 1fr); }
  .footer__grid { grid-template-columns: repeat(2, 1fr); gap: 32px; }
}
@media (max-width: 700px) {
  .section { padding: 64px 0; }
  .section-title { font-size: 27px; }
  .hero { padding: calc(var(--nav-h) + 60px) 0 76px; }
  .hero__title { font-size: 30px; }
  .hero__desc { font-size: 15px; }
  .grid-4, .grid-3, .grid-2, .news, .certs { grid-template-columns: 1fr; }
  .stats { grid-template-columns: 1fr 1fr; }
  .stat { padding: 22px 16px; }
  .stat strong { font-size: 28px; }
  .logowall { grid-template-columns: repeat(2, 1fr); }
  .form-row { grid-template-columns: 1fr; }
  .form-card { padding: 24px 20px; }
  .pagebanner h1 { font-size: 28px; }
  .news-row { grid-template-columns: 1fr; gap: 10px; padding: 20px 4px; }
  .footer__grid { grid-template-columns: 1fr; }
  .cta h2 { font-size: 24px; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: .01ms !important; transition-duration: .01ms !important; }
  html { scroll-behavior: auto; }
}