/* ============================================================
   西安米派网络 — 精密蓝色科技设计系统 (refined)
   设计原则：严谨排版层级 · 蓝色明度阶梯建立层次 · 1px 精致边框
   + 多层柔和阴影 · 窗口框精装截图 · 错落微动效 · 零 emoji
   ============================================================ */

:root {
  /* —— 冷调基底 —— */
  --paper: #f3f6fb;
  --paper-2: #eaf0f9;
  --surface: #ffffff;
  --surface-2: #fafcff;

  /* —— 蓝色明度阶梯（层次靠明度，不靠粗线）—— */
  --navy: #06182e;          /* 深海军蓝，实色块 */
  --navy-2: #0a2440;
  --navy-3: #0e2e52;
  --blue: #1f5bff;          /* 电光蓝，唯一强调 */
  --blue-hover: #0a47e6;
  --blue-bright: #5b8cff;   /* 深底上的高亮蓝 */
  --blue-soft: #e9f0ff;     /* 浅蓝底 */
  --mist: #6c87b4;          /* 雾蓝灰，中间调文字 */

  /* —— 文字 —— */
  --ink: #0a1422;
  --ink-2: #3f4f66;
  --ink-3: #76869e;
  --on-navy: #eef3ff;
  --on-navy-2: #9db4dc;
  --on-navy-3: #6f88b4;

  /* —— 线条（极细，低对比）—— */
  --line: #e6ecf5;
  --line-2: #d6e0ee;
  --line-navy: rgba(255, 255, 255, 0.09);
  --line-navy-2: rgba(255, 255, 255, 0.16);

  /* —— 形状 —— */
  --radius: 7px;
  --radius-sm: 5px;
  --radius-lg: 14px;
  --max: 1200px;
  --gutter: 28px;

  /* —— 多层柔和阴影（精密立体）—— */
  --shadow-xs: 0 1px 2px rgba(6, 24, 46, 0.04);
  --shadow-sm: 0 2px 10px rgba(6, 24, 46, 0.06);
  --shadow-md: 0 14px 34px -10px rgba(6, 24, 46, 0.14);
  --shadow-lg: 0 30px 70px -18px rgba(6, 24, 46, 0.22);
  /* 内高光：精致边缘 */
  --hairline: inset 0 1px 0 rgba(255, 255, 255, 0.6);

  /* —— 字体 —— */
  --font-sans: "Inter", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", ui-monospace, Menlo, monospace;

  /* —— 字号阶梯（模块化比例 ~1.2）—— */
  --fs-xs: 12px;
  --fs-sm: 13.5px;
  --fs-base: 15px;
  --fs-md: 17px;
  --fs-lg: 21px;
  --fs-xl: 28px;
  --fs-2xl: 38px;
  --fs-3xl: 52px;
  --fs-display: 68px;

  --header-h: 70px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: calc(var(--header-h) + 16px);
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: 1.72;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
::selection { background: var(--blue); color: #fff; }

h1, h2, h3, h4 { margin: 0; color: var(--ink); }
p { margin: 0; }

/* ============ 排版工具 ============ */
/* 眉头短标签整站隐藏 —— 反模板/去 SaaS 装饰噪音；HTML 保留以保语义 */
.eyebrow,
.eyebrow--navy { display: none !important; }

.lead {
  font-size: var(--fs-md);
  line-height: 1.75;
  color: var(--ink-2);
  max-width: 60ch;
  font-weight: 400;
}

.mono {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  letter-spacing: 0.03em;
  color: var(--ink-3);
}

/* 大号淡色序号水印 */
.watermark-no {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(80px, 12vw, 150px);
  line-height: 0.8;
  color: transparent;
  -webkit-text-stroke: 1px var(--line-2);
  letter-spacing: -0.02em;
  user-select: none;
  pointer-events: none;
}

/* ============ 布局 ============ */
.container {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.section { padding: 116px 0; position: relative; }
.section--tight { padding: 84px 0; }

.section--navy {
  background: var(--navy);
  color: var(--on-navy);
  position: relative;
  overflow: hidden;
}
.section--navy::before {
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 48px 48px;
  -webkit-mask-image: radial-gradient(ellipse 120% 80% at 50% 0%, #000 30%, transparent 85%);
  mask-image: radial-gradient(ellipse 120% 80% at 50% 0%, #000 30%, transparent 85%);
  pointer-events: none;
}
.section--navy > .container { position: relative; z-index: 1; }
.section--navy h1, .section--navy h2, .section--navy h3 { color: #fff; }
.section--navy .lead { color: var(--on-navy-2); }

/* 章节头部 */
.section-head { max-width: 760px; margin-bottom: 64px; }
.section-head h2 {
  font-size: var(--fs-2xl);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.16;
  margin: 20px 0 18px;
}
.section-head .lead { margin: 0; }

/* ============ 按钮 ============ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-sans);
  font-size: var(--fs-sm);
  font-weight: 600;
  padding: 12px 22px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.2s var(--ease), border-color 0.2s var(--ease),
              color 0.2s var(--ease), transform 0.2s var(--ease), box-shadow 0.2s var(--ease);
  white-space: nowrap;
  position: relative;
}
.btn .arw { font-family: var(--font-mono); font-size: 1.05em; line-height: 1; transition: transform 0.2s var(--ease); }
.btn:hover .arw { transform: translateX(4px); }
.btn--primary { background: var(--blue); color: #fff; box-shadow: 0 6px 18px -6px rgba(31, 91, 255, 0.5); }
.btn--primary:hover { background: var(--blue-hover); transform: translateY(-1px); box-shadow: 0 10px 24px -6px rgba(31, 91, 255, 0.55); }
.btn--navy { background: var(--navy); color: #fff; }
.btn--navy:hover { background: #030f1f; transform: translateY(-1px); }
.btn--ghost { background: transparent; color: var(--ink); border-color: var(--line-2); }
.btn--ghost:hover { border-color: var(--blue); color: var(--ink); background: var(--paper-2); }
.btn--ghost-light { background: transparent; color: #fff; border-color: var(--line-navy-2); }
.btn--ghost-light:hover { border-color: #fff; background: rgba(255, 255, 255, 0.07); }
.btn--sm { padding: 9px 16px; font-size: var(--fs-xs); }

/* ============ 头部 / 导航 ============
   关键：默认与 hero 同为深蓝 ── 整片科技域浑然一体；
   滚出 hero 后切换为浅色玻璃，保留可读性。 */
.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--navy);
  color: var(--on-navy);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  transition: background 0.42s var(--ease), color 0.42s var(--ease),
              border-color 0.42s var(--ease), backdrop-filter 0.42s var(--ease);
}
.header.is-outside {
  background: rgba(243, 246, 251, 0.84);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  backdrop-filter: saturate(180%) blur(16px);
  border-bottom-color: var(--line);
  color: var(--ink);
}
.header.is-outside .brand { color: var(--ink); }
.header.is-outside .brand small { color: var(--ink-3); }
.header.is-outside .nav__link { color: var(--ink-2); }
.header.is-outside .nav__link:hover,
.header.is-outside .nav__item.is-active > .nav__link { color: var(--ink); }
.header.is-outside .nav__caret { color: var(--ink-3); }
.header.is-outside .btn--ghost { border-color: var(--line-2); color: var(--ink); }
.header.is-outside .btn--ghost:hover { border-color: var(--blue); color: var(--ink); background: var(--paper-2); }
.header.is-outside .btn--ghost-light { border-color: var(--line-2); color: var(--ink); }
.header.is-outside .btn--ghost-light:hover { border-color: var(--blue); color: var(--ink); background: var(--paper-2); }

.header__inner {
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  font-weight: 700;
  font-size: var(--fs-md);
  letter-spacing: -0.01em;
  color: #fff;
  transition: color 0.42s var(--ease);
}
/* 头部默认深底：brand__mark 用电光蓝实心，区别 hero 的 navy 渐变 */
.header:not(.is-outside) .brand__mark {
  background: linear-gradient(150deg, #1d4ea3, var(--blue));
  border: 1px solid rgba(255, 255, 255, 0.14);
}
.brand__mark {
  width: 28px; height: 28px;
  border-radius: 8px;
  position: relative;
  flex: none;
  box-shadow: var(--hairline), var(--shadow-xs);
  overflow: hidden;
  transition: background 0.42s var(--ease), border-color 0.42s var(--ease);
}
/* 头部浅态：退回 navy 渐变 */
.header.is-outside .brand__mark {
  background: linear-gradient(150deg, var(--navy-2), var(--navy));
  border: 1px solid transparent;
}
.brand__mark::before {       /* 电光蓝菱形，精密几何 */
  content: "";
  position: absolute;
  inset: 0;
  margin: auto;
  width: 11px; height: 11px;
  border: 2px solid rgba(255, 255, 255, 0.92);
  transform: rotate(45deg);
}
.brand__mark::after {        /* 中心点 */
  content: "";
  position: absolute;
  inset: 0; margin: auto;
  width: 3px; height: 3px;
  background: var(--blue);
  border-radius: 50%;
}
.brand small {
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--on-navy-3);
  font-weight: 400;
  letter-spacing: 0.1em;
  transition: color 0.42s var(--ease);
}
.brand__logo { display: block; height: 30px; width: auto; }
.footer__brand .brand__logo { height: 36px; }
/* 页头双 logo：默认深蓝底用白字（logo500），滚出 hero 浅底用黑字（logo500_1） */
.brand__logo--dark { display: none; }
.header.is-outside .brand__logo--light { display: none; }
.header.is-outside .brand__logo--dark { display: block; }

.nav { display: flex; align-items: center; gap: 2px; }
.nav__item { position: relative; }
.nav__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 15px;
  font-size: var(--fs-sm);
  font-weight: 500;
  color: rgba(238, 243, 255, 0.74);
  border-radius: var(--radius-sm);
  position: relative;
  transition: color 0.2s var(--ease);
}
.nav__link::after {           /* 下划线滑入动画 */
  content: "";
  position: absolute;
  left: 15px; right: 15px; bottom: 4px;
  height: 1.5px;
  background: var(--blue-bright);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s var(--ease);
}
.nav__link:hover, .nav__item.is-active > .nav__link { color: #fff; }
.nav__link:hover::after, .nav__item.is-active > .nav__link::after { transform: scaleX(1); }
.nav__caret { font-size: 12px; color: rgba(238, 243, 255, 0.45); transition: transform 0.2s var(--ease), color 0.42s var(--ease); }
.nav__item.is-open .nav__caret { transform: rotate(180deg); }

.nav__dropdown {
  position: absolute;
  top: calc(100% + 14px);
  left: 0;
  min-width: 760px;
  background: rgba(255, 255, 255, 0.62);
  backdrop-filter: blur(28px) saturate(180%);
  -webkit-backdrop-filter: blur(28px) saturate(180%);
  border: 1px solid rgba(255, 255, 255, 0.55);
  border-radius: 14px;
  box-shadow:
    0 30px 80px -20px rgba(7, 28, 64, 0.28),
    0 10px 24px -10px rgba(7, 28, 64, 0.14),
    inset 0 1px 0 rgba(255, 255, 255, 0.65);
  padding: 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: opacity 0.22s var(--ease), transform 0.22s var(--ease), visibility 0.22s;
  overflow: hidden;
}
/* 顶部高光（玻璃质感点缀） */
.nav__dropdown::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.85), transparent);
  pointer-events: none;
}
.nav__item.is-open .nav__dropdown { opacity: 1; visibility: visible; transform: translateY(0); }
@media (hover: hover) {
  .nav__item:hover .nav__dropdown { opacity: 1; visibility: visible; transform: translateY(0); }
  .nav__item:hover .nav__caret { transform: rotate(180deg); }
}
.nav__mega { display: flex; }
.nav__mega-tabs {
  flex: none;
  width: 244px;
  padding: 12px 10px 12px 8px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  border-right: 1px solid rgba(255, 255, 255, 0.5);
  background:
    linear-gradient(180deg, rgba(233, 240, 255, 0.55), rgba(233, 240, 255, 0.4)),
    rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.nav__mega-tab {
  display: block;
  padding: 13px 13px 13px 14px;
  border-radius: 6px;
  color: var(--ink);
  text-decoration: none;
  transition: background 0.18s var(--ease), transform 0.18s var(--ease);
}
.nav__mega-tab.is-active,
.nav__mega-tab:hover {
  background: rgba(255, 255, 255, 0.7);
  box-shadow: 0 1px 0 rgba(255,255,255,0.4) inset, 0 6px 14px -8px rgba(7, 28, 64, 0.18);
}
.nav__mega-tab .brand { display: block; font-size: 15px; font-weight: 600; line-height: 1.3; color: var(--ink); }
.nav__mega-tab .desc { display: block; font-size: 12px; font-weight: 400; color: var(--ink-2); line-height: 1.4; margin-top: 4px; }
.nav__mega-panels { flex: 1; min-width: 0; padding: 24px; }
.nav__mega-panel { display: none; flex-direction: column; gap: 16px; }
.nav__mega-panel.is-active { display: flex; }
.nav__mega-panel__img {
  width: 100%;
  aspect-ratio: 16/9;
  overflow: hidden;
  border-radius: 10px;
  background: var(--paper-2);
  box-shadow: 0 16px 40px -16px rgba(7, 28, 64, 0.25), 0 0 0 1px rgba(255, 255, 255, 0.5);
}
.nav__mega-panel__img img { display: block; width: 100%; height: 100%; object-fit: cover; }
.nav__mega-panel__body { display: flex; flex-direction: column; gap: 8px; padding: 2px 2px 0; }
.nav__mega-panel__top { display: flex; align-items: center; gap: 10px; }
.nav__mega-panel__body h4 { font-size: 17px; font-weight: 600; color: var(--ink); line-height: 1.3; letter-spacing: -0.01em; }
.nav__mega-badge { font-size: 11px; font-weight: 600; color: #16794c; background: rgba(22, 121, 76, 0.12); padding: 2px 8px; border-radius: 99px; letter-spacing: 0.02em; }
.nav__mega-panel__body .lead { font-size: 13.5px; font-weight: 500; color: var(--ink); line-height: 1.4; margin: 0; }
.nav__mega-panel__body .d-long { font-size: 13px; font-weight: 400; color: var(--ink-2); line-height: 1.65; margin: 0; }
.nav__mega-feats { list-style: none; margin: 4px 0 0; padding: 0; display: flex; flex-direction: column; gap: 7px; }
.nav__mega-feats li { position: relative; padding-left: 18px; font-size: 12.5px; color: var(--ink); line-height: 1.45; }
.nav__mega-feats li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--blue);
}
.nav__mega-more {
  align-self: flex-start;
  margin-top: 4px;
  font-size: 13px;
  font-weight: 600;
  color: var(--blue);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  transition: gap 0.2s var(--ease), color 0.2s var(--ease);
}
.nav__mega-more:hover { gap: 9px; color: var(--blue-hover); }
.nav__mega-panel__body .f { font-size: 11.5px; font-weight: 500; color: var(--ink-3); font-family: var(--font-mono); letter-spacing: 0.04em; padding: 3px 7px; background: rgba(7, 28, 64, 0.05); border-radius: 4px; align-self: flex-start; }
.nav__drop-link .f { font-size: 11.5px; font-weight: 500; color: var(--ink-3); font-family: var(--font-mono); letter-spacing: 0.02em; margin-top: 3px; }

.header__cta { display: flex; align-items: center; gap: 12px; }

.nav-toggle {
  display: none;
  width: 42px; height: 42px;
  border: 1px solid var(--line-2);
  border-radius: var(--radius-sm);
  background: transparent;
  cursor: pointer;
  position: relative;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}
.nav-toggle span {
  position: absolute;
  left: 50%; top: 50%;
  width: 18px; height: 1.5px;
  margin-left: -9px; margin-top: -1px;
  background: var(--ink);
  border-radius: 1px;
  transition: transform 0.22s var(--ease), background 0.22s var(--ease);
}
.nav-toggle span::before, .nav-toggle span::after {
  content: "";
  position: absolute; left: 0; top: 0;
  width: 18px; height: 1.5px;
  background: inherit;
  border-radius: 1px;
  transition: transform 0.22s var(--ease);
}
.nav-toggle span::before { transform: translateY(-7px); }
.nav-toggle span::after  { transform: translateY(7px); }
.nav-toggle.is-open span { background: transparent; }
.nav-toggle.is-open span::before { transform: translateY(0) rotate(45deg); }
.nav-toggle.is-open span::after  { transform: translateY(0) rotate(-45deg); }
/* 深蓝 header 上汉堡线用白色（默认 ink 深色在 navy 上不可见） */
.header:not(.is-outside) .nav-toggle { border-color: rgba(255, 255, 255, 0.22); background: transparent; }
.header:not(.is-outside) .nav-toggle span,
.header:not(.is-outside) .nav-toggle span::before,
.header:not(.is-outside) .nav-toggle span::after { background: #fff; }

.mobile-menu {
  display: none;
  border-top: 1px solid var(--line);
  background: var(--surface);
  padding: 12px var(--gutter) 26px;
}
.mobile-menu.is-open { display: block; }
.mobile-menu a {
  display: block;
  padding: 15px 4px;
  font-size: var(--fs-md);
  font-weight: 500;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
}
.mobile-menu a.sub {
  padding-left: 20px;
  font-size: var(--fs-base);
  color: var(--ink-2);
  font-weight: 400;
  border-bottom: 1px solid var(--line);
}
/* 分组标题：视觉等同主菜单项，不可点击 */
.mobile-menu .grp {
  display: block;
  padding: 15px 4px;
  font-size: var(--fs-md);
  font-weight: 500;
  color: var(--ink);
  border-bottom: 1px solid var(--line);
  cursor: default;
  letter-spacing: -0.005em;
}
/* 按钮在 mobile-menu 内重置：恢复 .btn 自身样式，不被上面 .mobile-menu a 覆盖 */
.mobile-menu .btn {
  width: 100%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 14px 22px;
  margin-top: 20px;
  font-weight: 600;
  font-size: var(--fs-sm);
  color: #fff;
  border-bottom: 0;
  border-radius: var(--radius);
}

/* ============ 面包屑 ============ */
.crumbs {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.04em;
  color: var(--ink-3);
  padding: 22px 0 0;
}
.crumbs a { transition: color 0.15s var(--ease); }
.crumbs a:hover { color: var(--blue); }
.crumbs .sep { opacity: 0.5; }
.crumbs .cur { color: var(--ink-2); }

/* ============ 窗口框（精装截图）============ */
.shot-frame {
  border: 1px solid var(--line-2);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--surface);
  box-shadow: var(--shadow-lg), var(--hairline);
}
.shot-frame__bar {
  display: flex;
  align-items: center;
  gap: 14px;
  height: 40px;
  padding: 0 16px;
  background: linear-gradient(180deg, #fbfdff, #eef3fb);
  border-bottom: 1px solid var(--line);
}
.shot-frame__bar .dots { display: flex; gap: 7px; }
.shot-frame__bar .dots i { width: 9px; height: 9px; border-radius: 50%; background: #d4deec; display: block; }
.shot-frame__bar .url {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-3);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 100px;
  padding: 3px 12px;
  letter-spacing: 0.02em;
}
.shot-frame__body { background: var(--navy-2); line-height: 0; }
.shot-frame__body img { width: 100%; display: block; transition: transform 0.6s var(--ease); }
.shot-frame:hover .shot-frame__body img { transform: scale(1.015); }

/* ============ Hero ============ */
.hero {
  background: var(--navy);
  color: var(--on-navy);
  position: relative;
  overflow: hidden;
}
.hero::before {                /* 精密网格 */
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 52px 52px;
  -webkit-mask-image: radial-gradient(ellipse 95% 75% at 68% 25%, #000 25%, transparent 82%);
  mask-image: radial-gradient(ellipse 95% 75% at 68% 25%, #000 25%, transparent 82%);
  pointer-events: none;
}
.hero::after {                 /* 鼠标光晕（由 --mx/--my 驱动）*/
  content: "";
  position: absolute;
  width: 600px; height: 600px;
  left: var(--mx, 70%); top: var(--my, 20%);
  transform: translate(-50%, -50%);
  background: radial-gradient(circle, rgba(31, 91, 255, 0.22), transparent 62%);
  filter: blur(8px);
  pointer-events: none;
  transition: opacity 0.3s var(--ease);
}
.hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  align-items: center;
  padding: 108px 0 116px;
}
.hero__copy { position: relative; z-index: 2; display: block; }
.hero__visual {
  position: relative;
  z-index: 1;
  justify-self: stretch;
  width: 100%;
  margin-left: -72px;
}
.hero__visual img {
  display: block;
  width: 100%;
  height: auto;
}
.hero h1 {
  color: #fff;
  font-size: var(--fs-3xl);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.025em;
  margin: 22px 0 24px;
}
.hero h1 .em { color: var(--blue-bright); }
.hero__sub { font-size: var(--fs-md); color: var(--on-navy-2); max-width: 56ch; line-height: 1.78; font-weight: 400; }
.hero__actions { display: flex; gap: 14px; margin-top: 38px; flex-wrap: wrap; }
.hero__stats {
  display: flex;
  gap: 64px;
  margin-top: 72px;
  padding-top: 0;
}
.hero__stat { position: relative; }
.hero__stat + .hero__stat::before {
  content: "";
  position: absolute;
  left: -32px;
  top: 8px;
  bottom: 28px;
  width: 1px;
  background: rgba(255, 255, 255, 0.22);
}
.hero__stat .n { font-size: var(--fs-2xl); font-weight: 600; color: #fff; letter-spacing: -0.01em; line-height: 1; }
.hero__stat .l { font-size: var(--fs-xs); color: var(--on-navy-2); letter-spacing: 0.03em; margin-top: 10px; }

/* 轮播版（.hero--carousel）已弃用：当前首屏恢复为深蓝单栏大文案 hero（见 .hero 默认样式） */
.hero--carousel {
  padding: 0;
  max-width: none;
  width: 100%;
  overflow: visible;
  background: transparent;
}
.hero--carousel::before,
.hero--carousel::after { display: none; }

.carousel {
  position: relative;
  width: 1350px;          /* 固定 1350 宽 */
  max-width: 100%;        /* 窄屏不溢出视口 */
  aspect-ratio: 16 / 9;   /* 与 zbjd 原图比例一致；三张原图均不裁切主体 */
  margin: 0 auto;         /* 居中 */
  overflow: hidden;
}
.carousel__track { position: absolute; inset: 0; }
.carousel__slide {
  position: absolute; inset: 0;
  opacity: 0; visibility: hidden;
  transition: opacity 0.9s var(--ease);
}
.carousel__slide.is-active { opacity: 1; visibility: visible; }
.carousel__slide img {
  width: 100%; height: 100%;
  object-fit: cover; object-position: center;
  display: block;
}
.carousel__dots {
  position: absolute; bottom: 24px; left: 50%;
  transform: translateX(-50%);
  display: flex; gap: 10px; z-index: 3;
}
.carousel__dots button {
  width: 9px; height: 9px; border-radius: 50%;
  border: none; padding: 0;
  background: rgba(255, 255, 255, 0.45);
  cursor: pointer;
  transition: width 0.35s var(--ease), background 0.35s var(--ease), border-radius 0.35s var(--ease);
}
.carousel__dots button:hover { background: rgba(255, 255, 255, 0.75); }
.carousel__dots button.is-active { background: #fff; width: 30px; border-radius: 5px; }
@media (max-width: 680px) {
  /* 移动端同样按比例自适应，设个最矮下限避免过扁 */
  .carousel { min-height: 260px; }
}
@media (prefers-reduced-motion: reduce) {
  .carousel__slide { transition: none; }
}

/* ============ 信任条 ============ */
/* 无 1px 灰线，改用纯间距呼吸 —— 拒绝模板感 */
.trust { background: var(--surface); }
.trust__inner { display: flex; align-items: center; gap: 40px; padding: 34px var(--gutter); flex-wrap: wrap; }
.trust__label { font-family: var(--font-mono); font-size: var(--fs-xs); letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-3); flex: none; }
.trust__logos { display: flex; gap: 36px; flex-wrap: wrap; align-items: center; }
.trust__logos span { font-weight: 600; color: var(--ink-2); font-size: var(--fs-sm); letter-spacing: 0.01em; transition: color 0.15s var(--ease); }
.trust__logos span:hover { color: var(--blue); }

/* ============ 核心能力行 ============
   编辑式排版：超大序号水印 + 大标题 + 长描述，
   无横线、靠间距与字号建立层级，彻底摆脱"模板 feature list"。
   序号默认极淡蓝，hover 行时变实色。 */
.cap-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  column-gap: 56px;
}
.cap-row {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 18px;
  padding: 30px 0 32px;
  align-items: start;
  position: relative;
  transition: transform 0.35s var(--ease);
}
.cap-row:hover { transform: translateX(6px); }
.cap-row__no {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 40px;
  line-height: 0.85;
  letter-spacing: -0.04em;
  color: var(--blue);
  opacity: 0.18;          /* 编辑式水印：默认极淡 */
  margin-top: -2px;
  transition: opacity 0.35s var(--ease), color 0.35s var(--ease);
}
.cap-row:hover .cap-row__no { opacity: 1; }
.cap-row__t {
  font-size: clamp(20px, 1.8vw, 23px);
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.02em;
  line-height: 1.2;
}
.cap-row__d {
  margin-top: 8px;
  color: var(--ink-2);
  font-size: 14.5px;
  line-height: 1.65;
  max-width: 48ch;
}
.cap-row:last-child { grid-column: 1 / -1; }   /* 第 5 项横跨整行收尾 */

/* ============ 产品展示（三等宽，靠深/浅底穿插破模板感） ============ */
.products-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  align-items: stretch;
}
.pcard {
  background: var(--surface);
  border-radius: 14px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: 0 1px 0 rgba(13,30,60,.04), 0 18px 36px -22px rgba(13,30,60,.18);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
  position: relative;
}
.pcard:hover { transform: translateY(-3px); box-shadow: 0 1px 0 rgba(13,30,60,.04), 0 28px 50px -22px rgba(13,30,60,.28); }
.pcard--lg { background: linear-gradient(180deg, #ffffff 0%, #f7f9fc 100%); }
.pcard--sm { background: linear-gradient(180deg, #ffffff 0%, #f3f6fb 100%); position: relative; }
.pcard--sm::before {
  content: ""; position: absolute; left: 0; top: 26px; bottom: 26px;
  width: 2px; background: var(--blue); opacity: .65;
}
.pcard__media {
  background: linear-gradient(180deg, #eef2f8 0%, #e3e9f3 100%);
  line-height: 0;
  overflow: hidden;
  display: flex; align-items: center; justify-content: center;
}
.pcard__media img { width: 100%; height: auto; display: block; transition: transform 0.6s var(--ease); }
.pcard:hover .pcard__media img { transform: scale(1.04); }
.pcard__media--ink {
  background:
    radial-gradient(circle at 20% 30%, rgba(28,124,255,.16), transparent 55%),
    radial-gradient(circle at 80% 80%, rgba(96,165,250,.10), transparent 60%),
    linear-gradient(180deg, #f1f5fb 0%, #e6edf7 100%);
  position: relative;
  padding: 26px 22px;
  line-height: 1.4;
  overflow: hidden;
}
.pcard__media--ink::after {
  content: ""; position: absolute; right: 0; top: 0; bottom: 0;
  width: 28px;
  background: repeating-linear-gradient(180deg, rgba(22,87,255,.18) 0 1px, transparent 1px 7px);
  pointer-events: none;
}
.pcard__media--ink .kpis { display: flex; flex-direction: column; gap: 18px; width: 100%; }
.pcard__media--ink .kpi { display: flex; align-items: baseline; gap: 14px; border-top: 1px solid rgba(13,30,60,.10); padding-top: 14px; }
.pcard__media--ink .kpi:first-child { border-top: none; padding-top: 0; }
.pcard__media--ink .kpi__num {
  font-family: var(--font-mono); font-weight: 600;
  font-size: 40px; color: var(--ink); letter-spacing: -0.02em; line-height: 1;
}
.pcard__media--ink .kpi__lab { color: var(--ink-2); font-size: var(--fs-sm); }
.pcard__body { padding: 24px 26px 26px; display: flex; flex-direction: column; gap: 12px; flex: 1; }
.pcard__name {
  font-size: 22px; font-weight: 600; letter-spacing: -0.015em;
  color: var(--ink); line-height: 1.32; margin: 0;
}
.pcard__name i {
  font-style: normal; font-weight: 400;
  font-size: 22px; color: var(--ink-3);
  letter-spacing: 0; margin-left: 4px;
}
.pcard--sm .pcard__name { color: var(--ink); }
.pcard--sm .pcard__name i { color: var(--ink-3); }
.pcard__desc { color: var(--ink-2); font-size: var(--fs-sm); line-height: 1.72; flex: 1; margin: 0; }
.pcard--sm .pcard__desc { color: var(--ink-2); }
.pcard__link {
  font-size: var(--fs-sm); font-weight: 600; color: var(--blue);
  display: inline-flex; gap: 7px; align-items: center; margin-top: 4px;
  text-decoration: none;
}
.pcard--sm .pcard__link { color: var(--blue); }
.pcard__link .arw { transition: transform 0.2s var(--ease); }
.pcard:hover .pcard__link .arw { transform: translateX(5px); }

/* ============ 流程步骤 ============ */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; border-top: 1px solid var(--line-navy); border-bottom: 1px solid var(--line-navy); }
.step { padding: 52px 28px 52px 36px; border-right: 1px solid var(--line-navy); position: relative; }
.step:last-child { border-right: none; padding-right: 0; }
.step::before {
  content: ""; position: absolute; left: 0; top: 38px;
  width: 0; height: 2px; background: var(--blue-bright);
  transition: width 0.3s var(--ease);
}
.step:hover::before { width: 40px; }
.step__no { font-family: var(--font-mono); color: rgba(255,255,255,0.55); font-size: 14px; letter-spacing: 0.1em; transition: color 0.2s var(--ease); }
.step:hover .step__no { color: #fff; }
.step__t { color: #fff; font-size: var(--fs-md); font-weight: 600; margin: 24px 0 14px; letter-spacing: -0.01em; }
.step__d { color: var(--on-navy-2); font-size: var(--fs-sm); line-height: 1.68; }

/* ============ 双栏正文 ============ */
.split { display: grid; grid-template-columns: 0.86fr 1.14fr; gap: 70px; align-items: start; }
.split__aside { position: sticky; top: calc(var(--header-h) + 28px); }
/* about 编辑式 intro */
.about-intro { display: grid; grid-template-columns: 110px 1fr; gap: 30px; align-items: start; }
.about-intro__no { font-family: var(--font-mono); font-size: 44px; font-weight: 500; line-height: 0.9; color: var(--blue); opacity: 0.25; letter-spacing: -0.03em; }
.about-intro__body h2 { font-size: var(--fs-2xl); font-weight: 600; letter-spacing: -0.02em; line-height: 1.15; margin-bottom: 16px; }
.about-intro__body p { color: var(--ink-2); font-size: var(--fs-md); line-height: 1.8; max-width: 66ch; }
/* about 核心信息 2×2 缝隙网格 */
.info-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.info-card { padding: 26px 30px 28px; background: var(--surface); }
.info-card__no { display: block; font-family: var(--font-mono); font-size: 12px; color: var(--ink-3); letter-spacing: 0.08em; }
.info-card__k { display: block; font-family: var(--font-mono); font-size: 12px; color: var(--ink-2); letter-spacing: 0.05em; margin-top: 20px; }
.info-card__v { display: block; font-size: 19px; font-weight: 600; color: var(--ink); line-height: 1.3; margin-top: 6px; }
.info-card__d { color: var(--ink-2); font-size: 14px; line-height: 1.6; margin-top: 10px; }
/* contact 全面重设计 */
.contact-hero { padding: 124px 0 116px; }
.contact-hero__inner { display: grid; grid-template-columns: 1.18fr 0.82fr; gap: 72px; align-items: start; max-width: none; }
.contact-hero__copy { display: block; max-width: 580px; }
.contact-hero__eyebrow { display: inline-block; font-family: var(--font-mono); font-size: 13px; color: var(--blue-bright); margin-bottom: 28px; letter-spacing: 0.22em; }
.contact-hero__title { font-size: clamp(30px, 3.4vw, 42px); font-weight: 600; color: #fff; line-height: 1.15; letter-spacing: -0.025em; margin: 0 0 24px; }
.contact-hero__sub { font-size: var(--fs-md); color: var(--on-navy-2); line-height: 1.8; max-width: 50ch; margin: 0 0 56px; }

/* 邮箱/地址 精致信息块 */
.contact-info { display: flex; flex-direction: column; gap: 0; }
.contact-info__row { display: flex; flex-direction: column; gap: 12px; padding: 22px 0 24px; border-top: 1px solid rgba(255,255,255,0.12); }
.contact-info__row:last-child { border-bottom: 1px solid rgba(255,255,255,0.12); }
.contact-info__label { font-family: var(--font-mono); font-size: 12px; color: var(--on-navy-3); letter-spacing: 0.18em; text-transform: uppercase; }
.contact-info__mail { display: inline-block; font-size: clamp(19px, 2vw, 24px); font-weight: 500; color: #fff; letter-spacing: -0.01em; text-decoration: none; border-bottom: 1px solid rgba(255,255,255,0.28); padding-bottom: 4px; align-self: flex-start; transition: border-color 0.2s var(--ease); }
.contact-info__mail:hover { border-bottom-color: rgba(255,255,255,0.75); }
.contact-info__address { font-size: var(--fs-md); color: var(--on-navy-2); line-height: 1.85; margin: 0; max-width: 46ch; }

/* QR 精致卡片：整合 WECHAT 标签 */
.contact-hero__qr { display: flex; justify-content: center; padding-top: 100px; }
.qr-card { width: 224px; background: #fff; border-radius: 14px; box-shadow: 0 30px 80px -22px rgba(0,0,0,0.5), 0 0 0 1px rgba(255,255,255,0.04); overflow: hidden; }
.qr-card__head { display: flex; align-items: center; gap: 10px; padding: 13px 18px; border-bottom: 1px solid rgba(0,0,0,0.06); }
.qr-card__brand { font-family: var(--font-mono); font-size: 11px; color: #1a1a1a; letter-spacing: 0.2em; font-weight: 600; }
.qr-card__dot { width: 4px; height: 4px; border-radius: 50%; background: #c8c8c8; }
.qr-card__zh { font-size: 12px; color: #888; letter-spacing: 0.08em; }
.qr-card__img { padding: 16px 18px 14px; background: #fff; }
.qr-card__img img { width: 100%; display: block; border-radius: 2px; }
.qr-card__foot { padding: 0 18px 18px; text-align: center; font-size: 12px; color: #6b6b6b; letter-spacing: 0.08em; }

@media (max-width: 980px) {
  .contact-hero__inner { grid-template-columns: 1fr; gap: 56px; }
  .contact-hero__qr { padding-top: 0; justify-content: flex-start; }
  .contact-hero__sub { margin-bottom: 40px; }
}
.contact-block { display: grid; grid-template-columns: 1.3fr 1fr; gap: 72px; align-items: start; }
.contact-block__main { display: flex; flex-direction: column; }
.contact-line { display: grid; grid-template-columns: 96px 1fr 110px; gap: 24px; padding: 26px 0; border-top: 1px solid var(--line); align-items: baseline; transition: padding 0.2s var(--ease); text-decoration: none; }
.contact-line:last-child { border-bottom: 1px solid var(--line); }
a.contact-line:hover { padding-left: 10px; }
.contact-line:hover .contact-line__v { color: var(--blue-hover); }
.contact-line__k { font-family: var(--font-mono); font-size: 13px; color: var(--ink-2); letter-spacing: 0.04em; }
.contact-line__v { font-size: 23px; font-weight: 500; color: var(--ink); line-height: 1.4; transition: color 0.2s var(--ease); }
a.contact-line .contact-line__v { color: var(--blue); }
.contact-line__d { font-family: var(--font-mono); font-size: 12px; color: var(--ink-3); text-align: right; letter-spacing: 0.04em; }
.contact-block__side { display: flex; flex-direction: column; gap: 22px; position: sticky; top: calc(var(--header-h) + 28px); }
.contact-wechat { display: flex; align-items: center; gap: 18px; padding: 16px; border: 1px solid var(--line); border-radius: 6px; background: var(--surface); }
.contact-wechat img { width: 78px; height: 78px; border-radius: 4px; display: block; }
.contact-wechat__meta { display: flex; flex-direction: column; gap: 3px; }
.contact-wechat__label { font-family: var(--font-mono); font-size: 11px; color: var(--ink-3); letter-spacing: 0.1em; }
.contact-wechat__title { font-size: 15px; font-weight: 500; color: var(--ink); }
.map-art { display: block; width: 100%; height: auto; border-radius: 6px; border: 1px solid var(--line); background: var(--surface); }
/* contact 极简核心：邮箱 + 地址 + 二维码（居中） */
.contact-core { max-width: 760px; margin: 0 auto; text-align: center; padding: 44px 0 24px; }
.contact-core__mail { display: inline-block; font-size: clamp(26px, 3.4vw, 42px); font-weight: 600; color: var(--blue); letter-spacing: -0.01em; line-height: 1.2; text-decoration: none; transition: color 0.2s var(--ease); }
.contact-core__mail:hover { color: var(--blue-hover); }
.contact-core__address { margin: 28px auto 0; max-width: 54ch; font-size: var(--fs-md); color: var(--ink-2); line-height: 1.85; }
.contact-core__qr { margin-top: 52px; display: flex; flex-direction: column; align-items: center; gap: 16px; }
.contact-core__qr .qr { margin: 0; }
.contact-core__qr-label { font-family: var(--font-mono); font-size: 12px; color: var(--ink-3); letter-spacing: 0.12em; }
.prose h3 { font-size: var(--fs-xl); font-weight: 600; letter-spacing: -0.015em; margin: 0 0 16px; }
.prose h3:not(:first-child) { margin-top: 40px; }
.prose p { color: var(--ink-2); margin-bottom: 18px; line-height: 1.8; }
.prose p strong { color: var(--ink); font-weight: 600; }

/* 服务/能力块 */
.svc-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); overflow: hidden; }
.svc { background: var(--surface); padding: 34px; transition: background 0.2s var(--ease); }
.svc:hover { background: var(--surface-2); }
.svc__no { font-family: var(--font-mono); font-size: 14px; color: var(--ink-3); letter-spacing: 0.06em; }
.svc__t { font-size: var(--fs-lg); font-weight: 600; margin: 16px 0 12px; letter-spacing: -0.01em; }
.svc__d { color: var(--ink-2); font-size: var(--fs-sm); line-height: 1.75; }

/* 价值列表 */
.vlist { list-style: none; padding: 0; margin: 0; }
.vlist li { display: flex; gap: 16px; padding: 18px 0; border-bottom: 1px solid var(--line); }
.vlist li:last-child { border-bottom: none; }
.vlist .k { font-family: var(--font-mono); font-size: var(--fs-xs); color: var(--ink-2); flex: none; width: 40px; padding-top: 4px; font-weight: 500; }
.vlist .v strong { display: block; font-weight: 600; margin-bottom: 4px; color: var(--ink); }
.vlist .v span { color: var(--ink-2); font-size: var(--fs-sm); line-height: 1.7; }

/* ============ 产品子页 hero ============ */
.product-hero { background: var(--navy); color: var(--on-navy); position: relative; overflow: hidden; }
.product-hero::before {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.035) 1px, transparent 1px);
  background-size: 48px 48px;
  -webkit-mask-image: radial-gradient(ellipse 85% 65% at 72% 18%, #000 18%, transparent 78%);
  mask-image: radial-gradient(ellipse 85% 65% at 72% 18%, #000 18%, transparent 78%);
}
.product-hero__inner { position: relative; z-index: 1; display: grid; grid-template-columns: 1fr 1fr; gap: 52px; align-items: center; padding: 40px 0 88px; }
.product-hero h1 { color: #fff; font-size: var(--fs-2xl); font-weight: 600; letter-spacing: -0.02em; line-height: 1.12; margin: 18px 0 20px; }
.product-hero .lead { color: var(--on-navy-2); }
.product-hero__meta { display: flex; gap: 32px; margin-top: 34px; padding-top: 26px; border-top: 1px solid var(--line-navy); }
.product-hero__meta .n { font-family: var(--font-mono); font-size: var(--fs-xl); color: #fff; font-weight: 600; }
.product-hero__meta .l { font-size: var(--fs-xs); color: var(--on-navy-2); margin-top: 6px; }
.product-hero__shot .shot-frame { box-shadow: 0 40px 90px -20px rgba(0,0,0,.55), var(--hairline); }

/* 三张产品 banner 图满铺模式（替换原本的左右分栏 hero） */
.product-hero--banner { background: var(--paper); padding: 0; overflow: hidden; }
.product-hero--banner::before { display: none; }
.product-hero--banner .container { padding: 0; max-width: 100%; }
.product-hero__banner-img { display: block; width: 100%; height: auto; }

.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius-lg); overflow: hidden; }
.feature { background: var(--surface); padding: 32px; transition: background 0.2s var(--ease); }
.feature:hover { background: var(--surface-2); }
.feature__no { font-family: var(--font-mono); font-size: var(--fs-xs); color: var(--blue); letter-spacing: 0.08em; }
.feature__t { font-size: var(--fs-md); font-weight: 600; margin: 14px 0 10px; letter-spacing: -0.01em; }
.feature__d { color: var(--ink-2); font-size: var(--fs-sm); line-height: 1.75; }

/* 截图画廊 */
.gallery { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.shot {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--surface);
  box-shadow: var(--shadow-xs), var(--hairline);
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease);
}
.shot:hover { transform: translateY(-3px); box-shadow: var(--shadow-md), var(--hairline); }
.shot img { width: 100%; display: block; }
.shot figcaption { padding: 13px 17px; font-size: var(--fs-xs); color: var(--ink-3); font-family: var(--font-mono); border-top: 1px solid var(--line); letter-spacing: 0.02em; }

.pills { display: flex; flex-wrap: wrap; gap: 10px; }
.pill { font-size: var(--fs-sm); padding: 8px 15px; border: 1px solid var(--line-2); border-radius: 100px; color: var(--ink-2); background: var(--surface); transition: border-color 0.15s var(--ease), color 0.15s var(--ease); }
.pill:hover { border-color: var(--blue); color: var(--blue); }

/* 数据条 / 指标 */
.metrics { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius-lg); overflow: hidden; }
.metric { background: var(--surface); padding: 30px; }
.metric .n { font-family: var(--font-mono); font-size: var(--fs-2xl); font-weight: 600; color: var(--blue); letter-spacing: -0.02em; line-height: 1; }
.metric .l { font-size: var(--fs-sm); color: var(--ink-2); margin-top: 12px; }

/* ============ 联系页 ============ */
.contact-grid { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 60px; align-items: start; }
.contact-info .row { display: flex; gap: 16px; padding: 20px 0; border-bottom: 1px solid var(--line); }
.contact-info .row .k { font-family: var(--font-mono); font-size: var(--fs-xs); color: var(--blue); width: 92px; flex: none; padding-top: 3px; letter-spacing: 0.04em; }
.contact-info .row .v { color: var(--ink); line-height: 1.6; }
.qr { border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 16px; background: var(--surface); width: 192px; box-shadow: var(--shadow-xs), var(--hairline); }
.qr img { width: 100%; border-radius: 4px; }
.qr figcaption { font-size: var(--fs-xs); color: var(--ink-3); text-align: center; margin-top: 10px; }

.form { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 34px; box-shadow: var(--shadow-xs), var(--hairline); }
.form .field { margin-bottom: 20px; }
.form label { display: block; font-size: var(--fs-sm); font-weight: 500; margin-bottom: 8px; color: var(--ink); }
.form input, .form textarea, .form select {
  width: 100%;
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  padding: 12px 14px;
  border: 1px solid var(--line-2);
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  color: var(--ink);
  transition: border-color 0.16s var(--ease), box-shadow 0.16s var(--ease), background 0.16s var(--ease);
}
.form input:focus, .form textarea:focus, .form select:focus {
  outline: none;
  border-color: var(--blue);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(31, 91, 255, 0.13);
}
.form textarea { resize: vertical; min-height: 128px; }
.form .note { font-size: var(--fs-xs); color: var(--ink-3); margin-top: 14px; line-height: 1.6; }
.form .ok { display: none; margin-top: 16px; padding: 13px 15px; border-radius: var(--radius-sm); background: var(--blue-soft); color: var(--blue-hover); font-size: var(--fs-sm); font-weight: 500; }
.form.is-sent .ok { display: block; }

/* ============ 页脚 ============ */
.footer { background: var(--navy); color: var(--on-navy-2); padding: 72px 0 34px; position: relative; }
.footer::before {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.028) 1px, transparent 1px);
  background-size: 50px 50px; pointer-events: none;
}
.footer > .container { position: relative; z-index: 1; }
.footer__top { display: grid; grid-template-columns: 1.7fr 1fr 1fr 1fr; gap: 44px; padding-bottom: 48px; border-bottom: 1px solid var(--line-navy); }
.footer__brand .brand { color: #fff; margin-bottom: 16px; }
.footer__brand p { font-size: var(--fs-sm); line-height: 1.75; max-width: 36ch; color: var(--on-navy-2); }
.footer__col h4 { font-size: var(--fs-sm); color: #fff; font-weight: 600; margin-bottom: 18px; letter-spacing: 0.02em; }
.footer__col a { display: block; font-size: var(--fs-sm); padding: 8px 0; color: var(--on-navy-2); transition: color 0.15s var(--ease), transform 0.15s var(--ease); }
.footer__col a:hover { color: #fff; transform: translateX(3px); }
.footer__bottom { display: flex; justify-content: space-between; align-items: center; padding-top: 26px; font-size: var(--fs-xs); color: var(--on-navy-3); flex-wrap: wrap; gap: 12px; }
.footer__bottom .mono { font-family: var(--font-sans); color: var(--on-navy-3); text-decoration: none; }
.footer__bottom .mono:hover { color: #fff; }

/* ============ 滚动入场 + 错落 ============ */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
  .hero::after { display: none; }
}

/* ============ 响应式 ============ */
@media (max-width: 980px) {
  :root { --fs-3xl: 44px; --fs-2xl: 34px; --fs-xl: 26px; --fs-display: 52px; }
  .hero__inner, .product-hero__inner, .split, .contact-grid, .contact-cols, .contact-block { grid-template-columns: 1fr; gap: 44px; }
  .hero__visual { display: none; }
  .hero__shot, .product-hero__shot { order: -1; }
  .products-grid { grid-template-columns: repeat(2, 1fr); gap: 18px; }
  .pcard__name { font-size: 19px; line-height: 1.35; }
  .pcard__name i { font-size: 19px; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .metrics { grid-template-columns: 1fr; }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .step { border-right: none; padding: 36px 0 36px; border-bottom: 1px solid var(--line-navy); }
  .step:nth-last-child(-n+2) { border-bottom: none; }
  .footer__top { grid-template-columns: 1fr 1fr; }
  .cap-list { grid-template-columns: 1fr; column-gap: 0; }
  .cap-row { grid-template-columns: 52px 1fr; gap: 16px; padding: 26px 0 28px; }
  .cap-row__no { font-size: 32px; }
  .cap-row__t { font-size: 21px; }
  .cap-row:last-child { grid-column: auto; }
}
@media (max-width: 980px) {
  .nav, .header__cta .btn--ghost-light { display: none; }
  .nav-toggle { display: block; margin-left: 12px; }
  .header__cta { margin-left: auto; align-items: center; }
  .section { padding: 80px 0; }
  .section-head { margin-bottom: 44px; }
  .gallery { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  :root { --fs-3xl: 36px; --fs-2xl: 28px; --fs-xl: 22px; --fs-display: 44px; --gutter: 18px; }
  .section { padding: 72px 0; }
  .section--navy { padding: 80px 0; }
  .section-head { margin-bottom: 36px; }
  .products-grid, .feature-grid, .svc-grid, .steps, .info-grid, .cap-list { grid-template-columns: 1fr; }
  .about-intro { grid-template-columns: 1fr; gap: 14px; }
  .hero__stats { gap: 22px; flex-wrap: wrap; row-gap: 18px; }
  .hero__stat .n { font-size: 22px; }
  .hero__stat .l { font-size: 11px; }
  .footer__top { grid-template-columns: 1fr; gap: 36px; }
  .hero__actions .btn { flex: 1; justify-content: center; min-width: 0; }
  .split__aside { position: static; }
  .qr-card { width: 200px; }
  .qr-card__head { padding: 11px 14px; }
  .qr-card__img { padding: 12px 14px; }
  .qr-card__foot { padding: 0 14px 14px; font-size: 11.5px; }
  .contact-info__row { padding: 18px 0 20px; }
  .info-card { padding: 22px 22px 24px; }
  .cap-row { grid-template-columns: 44px 1fr; gap: 14px; padding: 22px 0 24px; }
  .cap-row__no { font-size: 26px; }
  .cap-row__t { font-size: 19px; }
  .nav-toggle { margin-left: 8px; }
  .header__cta { gap: 0; }
  .header__inner { min-height: 60px; }
  .footer__bottom { flex-direction: column; gap: 10px; align-items: flex-start; }
  .footer__bottom .mono { margin-left: 0; }
  .mobile-menu { padding: 16px 22px 28px; }
  .mobile-menu a { font-size: 16px; padding: 11px 0; }
  .mobile-menu .grp { font-size: 16px; padding: 11px 0; }
  .mobile-menu a.btn, .mobile-menu a.btn:hover { font-size: var(--fs-sm); padding: 14px 22px; border-bottom: 0; }
}
@media (max-width: 420px) {
  :root { --fs-3xl: 30px; --fs-2xl: 24px; --fs-xl: 20px; --fs-display: 36px; --gutter: 16px; }
  .hero__copy h1 { font-size: 30px; }
  .hero__stats { flex-direction: column; align-items: flex-start; gap: 14px; }
  .hero__stat + .hero__stat::before { display: none; }
  .hero__actions { flex-direction: column; }
  .footer__brand p { font-size: 13px; }
  .btn { font-size: 13px; padding: 11px 18px; }
  .btn--sm { padding: 8px 14px; font-size: 12.5px; }
}

/* 平板宽度（≤1100px）：760px 大弹窗在 nav__item 左侧展开会溢出视口，改为视口居中固定定位；
   ≤980px 时 .nav 已被隐藏，此规则无副作用 */
@media (max-width: 1100px) {
  .nav__dropdown {
    position: fixed;
    top: calc(var(--header-h) + 14px);
    left: 50%;
    width: min(760px, calc(100vw - 48px));
    min-width: 0;
    transform: translate(-50%, -10px);
  }
  .nav__item.is-open .nav__dropdown,
  .nav__item:hover .nav__dropdown { transform: translate(-50%, 0); }
}

/* ============ 兼容性兜底 ============ */
/* 不支持 backdrop-filter（老安卓 WebView / 部分国产浏览器）：降级为不透明白底，保证可读 */
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .header.is-outside { background: rgba(243, 246, 251, 0.97); }
  .nav__dropdown { background: rgba(255, 255, 255, 0.97); }
  .nav__mega-tabs {
    background: linear-gradient(180deg, #eef4ff, #e6eefc);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }
}
/* 防横向滚动：clip 不产生滚动容器（不影响 position: sticky），老浏览器忽略 */
@supports (overflow-x: clip) {
  html, body { overflow-x: clip; }
}

/* iOS 全面屏安全区：刘海/灵动岛不遮挡内容 */
@supports (padding: max(0px)) {
  .header__inner,
  .mobile-menu,
  .footer > .container,
  .container {
    padding-left: max(var(--gutter), env(safe-area-inset-left));
    padding-right: max(var(--gutter), env(safe-area-inset-right));
  }
}