@charset "utf-8";
/* =========================================================================
   山东鑫居达网络科技有限公司 · 企业官网
   文件名：assets/css/style.css
   设计基调：深墨蓝 + 冷白 + 铜金点缀；大留白、细边框、克制动效
   ========================================================================= */

/* ------------------------------ 01. 设计变量 ------------------------------ */
:root {
  /* 色板 */
  --ink:        #0A1626;
  --ink-soft:   #1B2B3D;
  --ink-mute:   #5C6D80;
  --ink-faint:  #8695A6;
  --line:       #E4E9F0;
  --line-strong:#D3DBE6;
  --bg:         #FFFFFF;
  --bg-soft:    #F5F7FA;
  --bg-deep:    #08121F;
  --brand:      #1A47D6;
  --brand-lite: #2C6BFF;
  --gold:       #B9924E;
  --gold-soft:  #D9BB86;

  /* 排版 */
  --font-sans: "PingFang SC", "HarmonyOS Sans SC", "Source Han Sans SC",
               "Noto Sans CJK SC", "Microsoft YaHei", system-ui, -apple-system,
               "Segoe UI", sans-serif;
  --font-serif: Georgia, "Times New Roman", "Songti SC", "STSong", serif;

  /* 结构 */
  --maxw: 1240px;
  --radius: 16px;
  --radius-sm: 10px;
  --header-h: 76px;

  /* 阴影与缓动 */
  --shadow-sm: 0 1px 2px rgba(10, 22, 38, .04), 0 10px 26px -14px rgba(10, 22, 38, .14);
  --shadow-md: 0 2px 6px rgba(10, 22, 38, .05), 0 22px 48px -24px rgba(10, 22, 38, .26);
  --ease: cubic-bezier(.22, .68, 0, 1);
}

/* ------------------------------ 02. 基础重置 ------------------------------ */
*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink-soft);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  margin: 0;
  color: var(--ink);
  font-weight: 600;
  line-height: 1.28;
  letter-spacing: -.02em;
}

p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; }

::selection { background: rgba(26, 71, 214, .14); color: var(--ink); }

:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 3px;
  border-radius: 4px;
}

/* 屏幕阅读器专用文本 */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ------------------------------ 03. 版心与通用元素 ------------------------------ */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 clamp(20px, 4.5vw, 40px);
}

.section { padding: clamp(72px, 8.5vw, 118px) 0; }
.section--soft { background: var(--bg-soft); }
.section--tight { padding: clamp(56px, 6vw, 84px) 0; }

/* 眉标：小字距标签 */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--brand);
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--gold);
}
.eyebrow--light { color: rgba(255, 255, 255, .72); }

/* 区块标题组 */
.section-head { max-width: 720px; }
.section-head h2 {
  margin-top: 18px;
  font-size: clamp(1.7rem, 3.2vw, 2.5rem);
  line-height: 1.3;
}
.section-head p {
  margin-top: 16px;
  color: var(--ink-mute);
  font-size: 1.02rem;
}
.section-head--center {
  max-width: 760px;
  margin: 0 auto;
  text-align: center;
}
.section-head--center .eyebrow::before { display: none; }
.section-head--center .eyebrow { padding: 0; }

/* 区块标题 + 右侧操作 */
.section-bar {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  height: 50px;
  padding: 0 26px;
  border: 1px solid transparent;
  border-radius: 4px;
  font-size: .95rem;
  font-weight: 500;
  letter-spacing: .01em;
  cursor: pointer;
  transition: background .3s var(--ease), color .3s var(--ease),
              border-color .3s var(--ease), transform .3s var(--ease),
              box-shadow .3s var(--ease);
}
.btn svg { flex: none; transition: transform .35s var(--ease); }
.btn:hover svg { transform: translateX(3px); }

.btn--primary {
  background: var(--ink);
  color: #fff;
  box-shadow: 0 10px 24px -14px rgba(10, 22, 38, .7);
}
.btn--primary:hover {
  background: var(--brand);
  box-shadow: 0 14px 30px -14px rgba(26, 71, 214, .6);
  transform: translateY(-1px);
}

.btn--ghost {
  background: transparent;
  border-color: var(--line-strong);
  color: var(--ink);
}
.btn--ghost:hover {
  border-color: var(--ink);
  transform: translateY(-1px);
}

.btn--light {
  background: #fff;
  color: var(--ink);
}
.btn--light:hover {
  background: var(--gold);
  color: #fff;
  transform: translateY(-1px);
}

.btn--outline-light {
  border-color: rgba(255, 255, 255, .28);
  color: #fff;
}
.btn--outline-light:hover {
  border-color: #fff;
  background: rgba(255, 255, 255, .06);
}

.btn--block { width: 100%; }

/* 文字链接 */
.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: .92rem;
  font-weight: 500;
  color: var(--ink);
  padding-bottom: 2px;
  border-bottom: 1px solid var(--line-strong);
  transition: color .3s var(--ease), border-color .3s var(--ease);
}
.link-arrow svg { transition: transform .3s var(--ease); }
.link-arrow:hover { color: var(--brand); border-color: var(--brand); }
.link-arrow:hover svg { transform: translateX(4px); }
.link-arrow--light { color: #fff; border-color: rgba(255, 255, 255, .35); }
.link-arrow--light:hover { color: var(--gold-soft); border-color: var(--gold-soft); }

/* 滚动进场动效：仅在 JS 可用时隐藏初始状态，避免脚本失效导致内容不可见 */
.js .reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .85s var(--ease), transform .85s var(--ease);
  transition-delay: var(--d, 0ms);
}
.js .reveal.is-in { opacity: 1; transform: none; }

/* 调试 / 减弱动效模式下彻底静止，便于静态截图与检查 */
.no-anim .reveal,
.no-anim .reveal.is-in {
  opacity: 1 !important;
  transform: none !important;
  transition: none !important;
}
.no-anim .net-ring,
.no-anim .net-ring-rev,
.no-anim .net-links path,
.no-anim .net-node { animation: none !important; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  .reveal { opacity: 1; transform: none; }
}

/* ------------------------------ 04. 顶部导航 ------------------------------ */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 90;
  height: var(--header-h);
  display: flex;
  align-items: center;
  color: rgba(255, 255, 255, .86);
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background .4s var(--ease), border-color .4s var(--ease),
              color .4s var(--ease), box-shadow .4s var(--ease);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  width: 100%;
}

/* 滚动后：白底实心 */
.site-header.is-scrolled,
.site-header.nav-open {
  background: rgba(255, 255, 255, .92);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom-color: var(--line);
  color: var(--ink-soft);
  box-shadow: 0 6px 24px -20px rgba(10, 22, 38, .5);
}

/* 品牌标识 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: none;
}
.brand-mark {
  width: 38px;
  height: 38px;
  border-radius: 11px;
  overflow: hidden;
  flex: none;
  box-shadow: 0 6px 16px -10px rgba(26, 71, 214, .9);
}
.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-text strong {
  font-size: 1.06rem;
  font-weight: 600;
  letter-spacing: .14em;
  color: #fff;
  transition: color .4s var(--ease);
}
.brand-text em {
  margin-top: 4px;
  font-family: var(--font-serif);
  font-style: normal;
  font-size: .58rem;
  letter-spacing: .2em;
  color: rgba(255, 255, 255, .5);
  transition: color .4s var(--ease);
}
.site-header.is-scrolled .brand-text strong,
.site-header.nav-open .brand-text strong { color: var(--ink); }
.site-header.is-scrolled .brand-text em,
.site-header.nav-open .brand-text em { color: var(--ink-faint); }

/* 导航链接 */
.nav {
  display: flex;
  align-items: center;
  gap: 6px;
}
.nav-link {
  position: relative;
  padding: 10px 16px;
  font-size: .94rem;
  color: rgba(255, 255, 255, .74);
  transition: color .3s var(--ease);
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 4px;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .4s var(--ease);
  opacity: .55;
}
.nav-link:hover { color: #fff; }
.nav-link:hover::after { transform: scaleX(1); }
.nav-link.is-active { color: #fff; }
.nav-link.is-active::after { transform: scaleX(1); background: var(--gold); opacity: 1; }

.site-header.is-scrolled .nav-link,
.site-header.nav-open .nav-link { color: var(--ink-mute); }
.site-header.is-scrolled .nav-link:hover,
.site-header.nav-open .nav-link:hover,
.site-header.is-scrolled .nav-link.is-active,
.site-header.nav-open .nav-link.is-active { color: var(--ink); }

.nav .btn {
  height: 40px;
  margin-left: 14px;
  padding: 0 20px;
  font-size: .88rem;
}
.nav .btn--primary {
  background: rgba(255, 255, 255, .1);
  border-color: rgba(255, 255, 255, .22);
  color: #fff;
  box-shadow: none;
}
.nav .btn--primary:hover { background: #fff; color: var(--ink); border-color: #fff; }
.site-header.is-scrolled .nav .btn--primary,
.site-header.nav-open .nav .btn--primary {
  background: var(--ink);
  border-color: var(--ink);
  color: #fff;
}
.site-header.is-scrolled .nav .btn--primary:hover,
.site-header.nav-open .nav .btn--primary:hover {
  background: var(--brand);
  border-color: var(--brand);
}

/* 移动端汉堡按钮 */
.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, .22);
  border-radius: 8px;
  background: transparent;
  cursor: pointer;
  position: relative;
  transition: border-color .3s var(--ease);
}
.nav-toggle span {
  position: absolute;
  left: 13px;
  width: 18px;
  height: 1.5px;
  background: #fff;
  transition: transform .35s var(--ease), opacity .25s var(--ease),
              background .35s var(--ease), top .35s var(--ease);
}
.nav-toggle span:nth-child(1) { top: 17px; }
.nav-toggle span:nth-child(2) { top: 24px; }
.site-header.is-scrolled .nav-toggle,
.site-header.nav-open .nav-toggle { border-color: var(--line-strong); }
.site-header.is-scrolled .nav-toggle span,
.site-header.nav-open .nav-toggle span { background: var(--ink); }
.site-header.nav-open .nav-toggle span:nth-child(1) { top: 21px; transform: rotate(45deg); }
.site-header.nav-open .nav-toggle span:nth-child(2) { top: 21px; transform: rotate(-45deg); }

/* ------------------------------ 06. 首页 Hero ------------------------------ */
.hero {
  position: relative;
  padding: calc(var(--header-h) + clamp(48px, 7vw, 92px)) 0 clamp(48px, 6vw, 76px);
  background:
    radial-gradient(1100px 620px at 80% 4%, rgba(44, 107, 255, .22), transparent 60%),
    radial-gradient(820px 520px at 2% 96%, rgba(185, 146, 78, .10), transparent 64%),
    linear-gradient(168deg, #0B1B2E 0%, #08121F 46%, #0A1A2C 100%);
  color: #fff;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, .042) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .042) 1px, transparent 1px);
  background-size: 76px 76px;
  -webkit-mask-image: radial-gradient(130% 100% at 68% 8%, #000 0%, transparent 74%);
  mask-image: radial-gradient(130% 100% at 68% 8%, #000 0%, transparent 74%);
  pointer-events: none;
}
.hero::after {
  content: "";
  position: absolute;
  left: 0; right: 0; top: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(185, 146, 78, .55), transparent);
  opacity: .6;
}

.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
  align-items: center;
  gap: clamp(32px, 5vw, 64px);
}

.hero-copy { max-width: 620px; }
.hero .eyebrow {
  color: rgba(255, 255, 255, .62);
  letter-spacing: .2em;
}
.hero .eyebrow::before { background: var(--gold); width: 26px; }

.hero h1 {
  margin-top: 26px;
  font-size: clamp(2.3rem, 4.9vw, 4.05rem);
  line-height: 1.18;
  color: #fff;
  letter-spacing: -.03em;
  font-weight: 600;
}
.hero h1 .dim { color: rgba(255, 255, 255, .5); }
.hero .lead {
  margin-top: 26px;
  max-width: 540px;
  font-size: clamp(.98rem, 1.2vw, 1.08rem);
  line-height: 1.85;
  color: rgba(255, 255, 255, .62);
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 38px;
}
.hero-actions .btn { height: 52px; padding: 0 28px; }
.hero-actions .btn--primary {
  background: #fff;
  color: var(--ink);
  box-shadow: 0 18px 40px -22px rgba(255, 255, 255, .5);
}
.hero-actions .btn--primary:hover {
  background: var(--gold);
  color: #fff;
  box-shadow: 0 18px 40px -20px rgba(185, 146, 78, .6);
}

/* Hero 底部能力条 */
.hero-foot {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
  margin-top: clamp(44px, 6vw, 74px);
  padding-top: 26px;
  border-top: 1px solid rgba(255, 255, 255, .1);
  font-size: .82rem;
  letter-spacing: .04em;
  color: rgba(255, 255, 255, .46);
}
.hero-foot .dot {
  width: 3px; height: 3px;
  border-radius: 50%;
  background: rgba(255, 255, 255, .26);
}
.hero-foot strong { font-weight: 500; color: rgba(255, 255, 255, .76); }

/* Hero 视觉：能力网络图 */
.hero-visual {
  position: relative;
  justify-self: center;
  width: 100%;
  max-width: 540px;
}
.hero-visual svg { width: 100%; height: auto; overflow: visible; }

.net-ring { transform-origin: 280px 280px; animation: spin 46s linear infinite; }
.net-ring-rev { transform-origin: 280px 280px; animation: spin 68s linear infinite reverse; }
.net-links path {
  stroke-dasharray: 5 9;
  animation: dash 22s linear infinite;
}
.net-node { animation: breathe 6s ease-in-out infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes dash { to { stroke-dashoffset: -280; } }
@keyframes breathe {
  0%, 100% { opacity: .82; }
  50% { opacity: 1; }
}
/* 节点标签 */
.net-label {
  font-family: var(--font-sans);
  font-size: 13px;
  fill: rgba(255, 255, 255, .88);
  letter-spacing: .06em;
  text-anchor: middle;
}
.net-core-label {
  font-family: var(--font-sans);
  font-size: 11px;
  fill: rgba(255, 255, 255, .55);
  letter-spacing: .18em;
  text-anchor: middle;
}

/* 桌面端固定换行，保持标题断句整齐 */
.br-desk { display: inline; }

/* ------------------------------ 07. 数据指标条 ------------------------------ */
.stats {
  border-bottom: 1px solid var(--line);
  background: var(--bg);
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}
.stat {
  padding: clamp(30px, 3.6vw, 46px) clamp(18px, 2.4vw, 34px);
  border-left: 1px solid var(--line);
}
.stat:first-child { border-left: none; padding-left: 0; }
.stat-num {
  display: flex;
  align-items: baseline;
  gap: 4px;
  font-family: var(--font-serif);
  font-size: clamp(2rem, 3.4vw, 2.7rem);
  line-height: 1;
  color: var(--ink);
  letter-spacing: -.02em;
}
.stat-num i {
  font-style: normal;
  font-size: .46em;
  color: var(--gold);
  transform: translateY(-.15em);
  letter-spacing: 0;
}
.stat p {
  margin-top: 12px;
  font-size: .88rem;
  color: var(--ink-mute);
  letter-spacing: .02em;
}

/* ------------------------------ 08. 业务卡片 ------------------------------ */
.service-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  margin-top: clamp(40px, 5vw, 60px);
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}
.service-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: clamp(28px, 3vw, 40px) clamp(24px, 2.6vw, 34px) clamp(26px, 2.6vw, 32px);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--bg);
  transition: background .45s var(--ease), transform .45s var(--ease),
              box-shadow .45s var(--ease);
  overflow: hidden;
}
.service-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--brand), var(--gold));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .5s var(--ease);
}
.service-card:hover {
  background: #fff;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  z-index: 2;
}
.service-card:hover::before { transform: scaleX(1); }

.service-icon {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(26, 71, 214, .14);
  border-radius: var(--radius-sm);
  color: var(--brand);
  background: rgba(26, 71, 214, .05);
  transition: color .4s var(--ease), border-color .4s var(--ease),
              background .4s var(--ease), transform .4s var(--ease);
}
.service-card:hover .service-icon {
  color: #fff;
  background: var(--ink);
  border-color: var(--ink);
  transform: translateY(-2px);
}
.service-icon svg { width: 23px; height: 23px; }

.service-card h3 {
  margin-top: 24px;
  font-size: 1.16rem;
  letter-spacing: -.01em;
}
.service-card > p {
  margin-top: 12px;
  min-height: 3.6em;
  font-size: .92rem;
  line-height: 1.8;
  color: var(--ink-mute);
}
/* 卡片编号（右上角） */
.card-no {
  position: absolute;
  top: clamp(26px, 2.8vw, 36px);
  right: clamp(22px, 2.4vw, 32px);
  font-family: var(--font-serif);
  font-size: .82rem;
  letter-spacing: .08em;
  color: var(--line-strong);
  transition: color .4s var(--ease);
}
.service-card:hover .card-no { color: var(--gold); }
.service-points {
  display: flex;
  flex-wrap: wrap;
  align-content: flex-start;
  gap: 6px 8px;
  margin-top: 20px;
  min-height: 58px;
}
.service-points li {
  font-size: .76rem;
  letter-spacing: .02em;
  color: var(--ink-mute);
  padding: 3px 9px;
  border: 1px solid var(--line);
  border-radius: 100px;
  transition: border-color .4s var(--ease), color .4s var(--ease);
}
.service-card:hover .service-points li { border-color: var(--line-strong); color: var(--ink-soft); }

.service-card .card-link {
  margin-top: auto;
  padding-top: 26px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: .85rem;
  font-weight: 500;
  color: var(--ink-faint);
  transition: color .35s var(--ease);
}
.service-card .card-link svg { transition: transform .35s var(--ease); }
.service-card:hover .card-link { color: var(--brand); }
.service-card:hover .card-link svg { transform: translate(3px, -3px); }

/* ------------------------------ 09. 优势（深色区） ------------------------------ */
.advantage {
  position: relative;
  color: #fff;
  background:
    radial-gradient(900px 480px at 88% 12%, rgba(44, 107, 255, .16), transparent 62%),
    linear-gradient(160deg, #0A1929 0%, #08121F 100%);
  overflow: hidden;
}
.advantage::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, .035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .035) 1px, transparent 1px);
  background-size: 68px 68px;
  -webkit-mask-image: radial-gradient(100% 90% at 20% 20%, #000, transparent 80%);
  mask-image: radial-gradient(100% 90% at 20% 20%, #000, transparent 80%);
  pointer-events: none;
}
.advantage .container { position: relative; z-index: 1; }

.adv-grid {
  display: grid;
  grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
  gap: clamp(36px, 6vw, 80px);
  align-items: start;
}
.adv-intro h2 {
  margin-top: 20px;
  font-size: clamp(1.7rem, 3.2vw, 2.4rem);
  color: #fff;
}
.adv-intro p {
  margin-top: 20px;
  font-size: .98rem;
  line-height: 1.9;
  color: rgba(255, 255, 255, .55);
}
.adv-intro .link-arrow { margin-top: 34px; }

.adv-list { display: grid; gap: 0; }
.adv-item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: clamp(14px, 1.8vw, 22px);
  padding: 26px 0;
  border-top: 1px solid rgba(255, 255, 255, .1);
}
.adv-item:last-child { border-bottom: 1px solid rgba(255, 255, 255, .1); }
.adv-num {
  font-family: var(--font-serif);
  font-size: .95rem;
  color: var(--gold);
  letter-spacing: .06em;
  padding-top: 3px;
}
.adv-item h3 {
  font-size: 1.06rem;
  color: #fff;
  font-weight: 500;
  letter-spacing: .01em;
}
.adv-item p {
  margin-top: 8px;
  font-size: .9rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, .5);
}

/* ------------------------------ 10. 流程 ------------------------------ */
.flow {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: clamp(18px, 2.4vw, 30px);
  margin-top: clamp(40px, 5vw, 60px);
  counter-reset: flow;
}
.flow-item {
  position: relative;
  padding-top: 30px;
  border-top: 1px solid var(--line-strong);
}
.flow-item::before {
  content: "";
  position: absolute;
  top: -1px; left: 0;
  width: 34px;
  height: 1px;
  background: var(--brand);
}
.flow-step {
  font-family: var(--font-serif);
  font-size: .8rem;
  letter-spacing: .14em;
  color: var(--brand);
}
.flow-item h3 {
  margin-top: 14px;
  font-size: 1.06rem;
  font-weight: 600;
}
.flow-item p {
  margin-top: 10px;
  font-size: .9rem;
  line-height: 1.8;
  color: var(--ink-mute);
}

/* ------------------------------ 12. 页脚 ------------------------------ */
.site-footer {
  background: var(--bg-deep);
  color: rgba(255, 255, 255, .55);
  padding-top: clamp(56px, 6vw, 76px);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: clamp(28px, 4vw, 56px);
  padding-bottom: clamp(40px, 5vw, 56px);
}
.footer-brand .brand { margin-bottom: 22px; }
.footer-brand p {
  font-size: .88rem;
  line-height: 1.9;
  max-width: 300px;
  color: rgba(255, 255, 255, .44);
}
.footer-title {
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .16em;
  color: rgba(255, 255, 255, .82);
  margin-bottom: 20px;
}
.footer-list li { margin-bottom: 12px; }
.footer-list a,
.footer-list span {
  font-size: .88rem;
  color: rgba(255, 255, 255, .46);
  transition: color .3s var(--ease);
}
.footer-list a:hover { color: #fff; }
.footer-contact li {
  display: flex;
  gap: 10px;
  margin-bottom: 14px;
  font-size: .88rem;
  line-height: 1.6;
  color: rgba(255, 255, 255, .46);
}
.footer-contact svg { flex: none; margin-top: 4px; color: var(--gold); opacity: .8; }
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding: 22px 0;
  border-top: 1px solid rgba(255, 255, 255, .08);
  font-size: .78rem;
  color: rgba(255, 255, 255, .3);
  letter-spacing: .02em;
}
.footer-bottom a { color: rgba(255, 255, 255, .3); }
.footer-bottom a:hover { color: rgba(255, 255, 255, .7); }

/* ------------------------------ 13. 关于我们页 ------------------------------ */
.about-intro {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
  gap: clamp(36px, 6vw, 80px);
  align-items: start;
}
.about-intro .prose p {
  font-size: 1.02rem;
  line-height: 2;
  color: var(--ink-mute);
}
.about-intro .prose p + p { margin-top: 20px; }
.about-intro .prose strong { color: var(--ink); font-weight: 500; }

.intro-sign {
  margin-top: 34px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  display: flex;
  align-items: center;
  gap: 18px;
}
.intro-sign .mark {
  width: 42px; height: 42px;
  border-radius: 10px;
  overflow: hidden;
  flex: none;
}
.intro-sign span { font-size: .85rem; color: var(--ink-mute); line-height: 1.7; }
.intro-sign b { display: block; color: var(--ink); font-weight: 500; font-size: .95rem; }

/* 右侧信息卡 */
.fact-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-soft);
  padding: clamp(26px, 3vw, 36px);
}
.fact-card .fact-title {
  font-size: .78rem;
  letter-spacing: .16em;
  color: var(--ink-faint);
  text-transform: uppercase;
}
.fact-list { margin-top: 6px; }
.fact-list li {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
  font-size: .9rem;
}
.fact-list li:last-child { border-bottom: none; padding-bottom: 0; }
.fact-list dt, .fact-list .k { color: var(--ink-faint); flex: none; width: 74px; }
.fact-list .v { color: var(--ink); font-weight: 500; flex: 1; }

/* 使命 / 愿景 / 价值观 */
.mvv {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  margin-top: clamp(36px, 4.4vw, 56px);
}
.mvv-item {
  background: #fff;
  padding: clamp(28px, 3.2vw, 40px);
  transition: background .4s var(--ease);
}
.mvv-item:hover { background: var(--bg-soft); }
.mvv-item .mvv-tag {
  font-size: .74rem;
  letter-spacing: .2em;
  color: var(--gold);
  font-weight: 600;
}
.mvv-item h3 {
  margin-top: 16px;
  font-size: 1.15rem;
}
.mvv-item p {
  margin-top: 12px;
  font-size: .92rem;
  line-height: 1.85;
  color: var(--ink-mute);
}

/* ------------------------------ 15. 联系我们页 ------------------------------ */
.contact-layout {
  display: grid;
  grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
  gap: clamp(32px, 5vw, 72px);
  align-items: start;
}
/* 仅保留留言表单时的单栏居中版式 */
.contact-layout--single {
  display: block;
  max-width: 760px;
  margin: 0 auto;
}

.contact-cards { display: grid; gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.contact-card {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 18px;
  padding: clamp(22px, 2.6vw, 28px);
  background: #fff;
  transition: background .4s var(--ease);
}
.contact-card:hover { background: var(--bg-soft); }
.contact-card .ic {
  width: 42px; height: 42px;
  display: grid; place-items: center;
  border-radius: 10px;
  border: 1px solid var(--line);
  color: var(--brand);
  background: #fff;
}
.contact-card h3 {
  font-size: .76rem;
  letter-spacing: .14em;
  color: var(--ink-faint);
  font-weight: 500;
}
.contact-card .val {
  margin-top: 7px;
  font-size: 1.02rem;
  color: var(--ink);
  font-weight: 500;
  letter-spacing: .01em;
  word-break: break-all;
}
.contact-card .val a:hover { color: var(--brand); }
.contact-card .note {
  margin-top: 5px;
  font-size: .82rem;
  color: var(--ink-faint);
  line-height: 1.7;
}

.contact-note {
  margin-top: 24px;
  padding: 22px 24px;
  border-left: 2px solid var(--gold);
  background: var(--bg-soft);
  font-size: .86rem;
  line-height: 1.9;
  color: var(--ink-mute);
}
.contact-note b { color: var(--ink); font-weight: 500; }

/* 表单 */
.form-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(26px, 3.4vw, 44px);
  background: #fff;
  box-shadow: var(--shadow-sm);
}
.form-card .form-head h2 {
  font-size: clamp(1.3rem, 2.2vw, 1.62rem);
}
.form-card .form-head p {
  margin-top: 10px;
  font-size: .88rem;
  color: var(--ink-mute);
}
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px 20px;
  margin-top: 30px;
}
.field { display: flex; flex-direction: column; gap: 8px; }
.field--full { grid-column: 1 / -1; }
/* 蜜罐字段：移出可视区域，正常访客看不到也不会聚焦 */
.field--hp {
  position: absolute !important;
  left: -9999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}
.field label {
  font-size: .82rem;
  color: var(--ink-soft);
  letter-spacing: .02em;
}
.field label .req { color: #C0392B; margin-left: 2px; }
.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 12px 14px;
  font-family: inherit;
  font-size: .92rem;
  line-height: 1.6;
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  transition: border-color .3s var(--ease), box-shadow .3s var(--ease),
              background .3s var(--ease);
  -webkit-appearance: none;
  appearance: none;
}
.field textarea { min-height: 132px; resize: vertical; }
.field select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' fill='none' stroke='%235C6D80' stroke-width='1.4' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 38px;
}
.field input:hover,
.field select:hover,
.field textarea:hover { border-color: #B9C4D2; }
.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(26, 71, 214, .1);
}
.field input::placeholder,
.field textarea::placeholder { color: #A8B4C2; }

/* 校验错误态 */
.field.has-error input,
.field.has-error select,
.field.has-error textarea {
  border-color: #C0392B;
  background: #FDF7F6;
}
.field-error {
  display: none;
  font-size: .78rem;
  color: #C0392B;
  line-height: 1.5;
}
.field.has-error .field-error { display: block; }

.form-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  margin-top: 26px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}
.form-tip {
  font-size: .78rem;
  line-height: 1.7;
  color: var(--ink-faint);
  max-width: 340px;
}
.form-foot .btn { min-width: 168px; }

/* 提交结果提示 */
.form-alert {
  display: none;
  align-items: flex-start;
  gap: 12px;
  margin-top: 22px;
  padding: 16px 18px;
  border-radius: 8px;
  font-size: .88rem;
  line-height: 1.7;
}
.form-alert.is-visible { display: flex; }
.form-alert svg { flex: none; margin-top: 3px; }
.form-alert--ok {
  background: rgba(26, 71, 214, .06);
  border: 1px solid rgba(26, 71, 214, .18);
  color: #14357F;
}
.form-alert--err {
  background: #FDF7F6;
  border: 1px solid #F0D3CE;
  color: #A32E20;
}

/* ------------------------------ 16. 响应式 ------------------------------ */
@media (max-width: 1080px) {
  .hero-grid { grid-template-columns: 1fr; gap: 44px; }
  .hero-copy { max-width: 680px; }
  .hero-visual { max-width: 460px; justify-self: start; }
  .adv-grid { grid-template-columns: 1fr; gap: 40px; }
  .about-intro { grid-template-columns: 1fr; gap: 40px; }
  .contact-layout { grid-template-columns: 1fr; gap: 40px; }
  .footer-grid { grid-template-columns: 1.4fr 1fr 1fr; }
  .footer-grid .footer-col--contact { grid-column: 1 / -1; }
}

@media (max-width: 900px) {
  .nav-toggle { display: block; }
  .nav {
    position: fixed;
    top: var(--header-h);
    left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 10px 20px 24px;
    background: #fff;
    border-bottom: 1px solid var(--line);
    box-shadow: 0 24px 40px -30px rgba(10, 22, 38, .6);
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    transition: opacity .3s var(--ease), transform .3s var(--ease),
                visibility .3s var(--ease);
  }
  .site-header.nav-open .nav {
    opacity: 1;
    transform: none;
    visibility: visible;
  }
  .nav-link {
    padding: 15px 4px;
    font-size: 1rem;
    color: var(--ink-mute);
    border-bottom: 1px solid var(--line);
  }
  .nav-link::after { display: none; }
  .nav-link.is-active { color: var(--brand); }
  .nav .btn {
    margin: 18px 0 0;
    height: 46px;
    width: 100%;
    background: var(--ink);
    border-color: var(--ink);
    color: #fff;
  }
  .service-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .stat { padding-left: 22px; }
  .stat:nth-child(odd) { border-left: none; padding-left: 0; }
  .stat:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .flow { grid-template-columns: repeat(2, 1fr); gap: 32px 24px; }
  .mvv { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  :root { --header-h: 68px; }
  body { font-size: 15.5px; }
  .brand-mark { width: 34px; height: 34px; border-radius: 9px; }
  .brand-text strong { font-size: .98rem; }
  .brand-text em { font-size: .52rem; letter-spacing: .16em; }
  .hero { padding-top: calc(var(--header-h) + 44px); }
  .hero h1 { font-size: clamp(2rem, 8.6vw, 2.6rem); }
  .hero .lead { font-size: .95rem; }
  .hero-actions .btn { flex: 1 1 auto; min-width: 148px; padding: 0 18px; }
  .hero .eyebrow { font-size: 10px; letter-spacing: .16em; }
  /* 首屏底部能力条改为两列，避免分隔点单独折行 */
  .hero-foot {
    display: grid;
    grid-template-columns: auto auto;
    justify-content: start;
    gap: 8px 20px;
    font-size: .78rem;
  }
  .hero-foot .dot { display: none; }
  .hero-visual { max-width: 340px; }
  .service-grid { grid-template-columns: 1fr; }
  .service-card > p { min-height: 0; }
  .service-points { min-height: 0; }
  .service-points li { padding: 3px 8px; font-size: .74rem; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .flow { grid-template-columns: 1fr; }
  .form-grid { grid-template-columns: 1fr; }
  .form-foot { flex-direction: column; align-items: stretch; }
  .form-foot .btn { width: 100%; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
  .footer-grid .footer-col--contact { grid-column: 1 / -1; }
  .section-head h2 { font-size: 1.55rem; }
  .about-intro .prose p { font-size: .96rem; }
}