/* ========== 天竞云合官网 · 月暗风首页样式 ==========
   纯黑底 + 巨型故障艺术跑马灯 + 日冕光环 + 极简分区
   标题：金山云技术体 | 强调色：青蓝 #57B6E4 */

:root {
  --accent: #57B6E4;
  --bg: #040404;
  --bg-soft: #0B0B0D;
  --card: #101013;
  --line: rgba(255, 255, 255, .1);
  --ink: #F5F5F5;
  --ink-dim: rgba(245, 245, 245, .6);
  --ink-faint: rgba(245, 245, 245, .38);
  --title-font: "JinshanYun", "PingFang SC", "Microsoft YaHei", sans-serif;
  --body-font: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --maxw: 1240px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

@font-face {
  font-family: "JinshanYun";
  src: url("../fonts/jinshanyun-title-v2.woff2") format("woff2");
  font-display: swap;
}

html { scroll-behavior: smooth; }
body {
  font-family: var(--body-font);
  background: var(--bg); color: var(--ink);
  line-height: 1.8; -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
::selection { background: rgba(87, 182, 228, .35); }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 48px; }

/* ---------- 导航：极简 ---------- */
.nav { position: fixed; inset: 0 0 auto; z-index: 100; transition: background .35s; }
.nav.scrolled { background: rgba(4, 4, 4, .82); backdrop-filter: blur(16px); border-bottom: 1px solid var(--line); }
.nav-inner { max-width: var(--maxw); margin: 0 auto; padding: 0 48px; height: 84px; display: flex; align-items: center; }
.nav-logo { display: flex; align-items: center; gap: 12px; }
.nav-logo img { height: 30px; }
.nav-menu { display: flex; gap: 38px; margin: 0 auto; }
.nav-menu a { font-size: 15px; color: var(--ink-dim); transition: color .25s; letter-spacing: .04em; }
.nav-menu a:hover, .nav-menu a.active { color: #fff; }
.nav-toggle { display: none; }

/* ---------- 首屏：故障跑马灯 + 日冕 + 日志环境层 ---------- */
.hero {
  position: relative; min-height: 100vh; overflow: hidden;
  display: flex; flex-direction: column; justify-content: center; align-items: center;
  background: radial-gradient(1000px 560px at 50% 44%, #0D1420 0%, #040404 62%);
}
#log-canvas { position: absolute; inset: 0; width: 100%; height: 100%; }

/* 巨型字：淡出淡入 + 扫描线 + 颗粒肌理 + 随机故障脉冲 */
.mega {
  position: absolute; top: 38%; left: 0; right: 0;
  transform: translateY(-50%);
  pointer-events: none; user-select: none;
}
.mega-word {
  position: absolute; left: 50%; top: 0;
  transform: translate(-50%, -50%);
  white-space: nowrap; line-height: 1;
  font-family: var(--title-font); font-weight: 400;
  font-size: clamp(150px, 19vw, 300px);
  letter-spacing: .02em;
  color: transparent;
  background: repeating-linear-gradient(180deg, rgba(255,255,255,.92) 0 2px, rgba(255,255,255,.3) 2px 4px, transparent 4px 6px);
  -webkit-background-clip: text; background-clip: text;
  opacity: 0;
  animation: wordFade 14s ease-in-out infinite;
  will-change: opacity, filter;
}
.mega-word.cn { letter-spacing: .1em; animation-delay: -7s; }
@keyframes wordFade {
  0% { opacity: 0; }
  7% { opacity: 1; }
  43% { opacity: 1; }
  50% { opacity: 0; }
  100% { opacity: 0; }
}
/* 颗粒肌理：SVG 噪点只落笔画（feComposite in SourceAlpha），双种子步进切换 */
.mega {
  filter: url(#grainF);
  animation: grainSwap .8s steps(1) infinite;
}
@keyframes grainSwap {
  0%, 49.9% { filter: url(#grainF); }
  50%, 100% { filter: url(#grainF2); }
}
/* 故障脉冲：JS 随机挂类，强 RGB 分离 + 切片错位 */
.mega-word.glitching {
  animation: wordFade 14s ease-in-out infinite, glitchPulse .55s steps(2, end) 1;
}
.mega-word.cn.glitching { animation-delay: -7s, 0s; }
@keyframes glitchPulse {
  0% { translate: 0 0; filter: none; clip-path: inset(0 0 0 0); }
  10% { translate: -16px 5px; clip-path: inset(10% 0 62% 0); filter: drop-shadow(-12px 0 rgba(255,60,80,.9)) drop-shadow(12px 0 rgba(87,182,228,.95)); }
  22% { translate: 14px -7px; clip-path: inset(58% 0 6% 0); filter: drop-shadow(10px 0 rgba(255,60,80,.85)) drop-shadow(-10px 0 rgba(87,182,228,.9)); }
  34% { translate: -7px 3px; clip-path: inset(0 0 0 0); filter: drop-shadow(-16px 0 rgba(255,60,80,.95)) drop-shadow(16px 0 rgba(87,182,228,.95)); }
  48% { translate: 9px 0; clip-path: inset(34% 0 38% 0); filter: drop-shadow(7px 0 rgba(255,60,80,.75)) drop-shadow(-7px 0 rgba(87,182,228,.8)); }
  62% { translate: -12px -4px; clip-path: inset(6% 0 78% 0); filter: drop-shadow(-9px 0 rgba(255,60,80,.85)) drop-shadow(9px 0 rgba(87,182,228,.85)); }
  78% { translate: 5px 2px; clip-path: inset(0 0 0 0); filter: drop-shadow(-5px 0 rgba(255,60,80,.6)) drop-shadow(5px 0 rgba(87,182,228,.65)); }
  100% { translate: 0 0; filter: none; clip-path: inset(0 0 0 0); }
}

/* 日冕光环：细环 + 旋转高光 */
.corona {
  position: absolute; top: 38%; left: 50%;
  width: clamp(260px, 27vw, 420px); aspect-ratio: 1;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  pointer-events: none;
}
.corona::before {
  content: ""; position: absolute; inset: 0;
  border-radius: 50%;
  background: conic-gradient(from 120deg, rgba(255,255,255,.06) 0deg, rgba(255,255,255,.98) 50deg, rgba(87,182,228,.9) 100deg, rgba(255,255,255,.2) 170deg, rgba(255,255,255,.06) 230deg, rgba(87,182,228,.55) 300deg, rgba(255,255,255,.06) 360deg);
  -webkit-mask: radial-gradient(circle, transparent 66.5%, #000 68%, #000 71%, transparent 72.5%);
          mask: radial-gradient(circle, transparent 66.5%, #000 68%, #000 71%, transparent 72.5%);
  filter: blur(1.5px);
  animation: coronaSpin 26s linear infinite;
}
.corona::after {
  content: ""; position: absolute; inset: 6%;
  border-radius: 50%;
  box-shadow: 0 0 140px 30px rgba(87, 182, 228, .14), inset 0 0 80px rgba(87,182,228,.05);
}
@keyframes coronaSpin { to { transform: rotate(360deg); } }

/* 首屏文案：压在光环之下 */
.hero-copy {
  position: absolute; top: 62%; left: 0; right: 0;
  z-index: 3; text-align: center; padding: 0 24px;
}
.hero-copy .cn-name {
  font-size: 15px; letter-spacing: .55em; color: var(--ink-faint);
  text-transform: uppercase; margin-bottom: 26px; text-indent: .55em;
}
.hero-copy h1 {
  font-family: var(--title-font); font-weight: 400;
  font-size: clamp(30px, 3.4vw, 46px); letter-spacing: .18em; text-indent: .18em;
}
.hero-copy h1 em { font-style: normal; color: var(--accent); }
.hero-actions { margin-top: 46px; display: flex; gap: 16px; justify-content: center; }
.pill {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 14px 38px; border-radius: 999px; font-size: 15px; letter-spacing: .12em;
  border: 1px solid rgba(255, 255, 255, .22); color: var(--ink);
  transition: all .3s;
}
.pill:hover { border-color: #fff; transform: translateY(-2px); }
.pill.solid { background: #F5F5F5; color: #0A0A0A; border-color: #F5F5F5; font-weight: 600; }
.pill.solid:hover { background: var(--accent); border-color: var(--accent); color: #06203C; }
.scroll-hint {
  position: absolute; bottom: 30px; left: 50%; transform: translateX(-50%);
  font-size: 11px; letter-spacing: .35em; color: var(--ink-faint); z-index: 3;
  display: flex; flex-direction: column; align-items: center; gap: 10px;
}
.scroll-hint::after {
  content: ""; width: 1px; height: 44px;
  background: linear-gradient(rgba(255,255,255,.7), transparent);
  animation: drip 2s ease-in-out infinite;
}
@keyframes drip { 0% { transform: scaleY(0); transform-origin: top; } 55% { transform: scaleY(1); transform-origin: top; } 56% { transform-origin: bottom; } 100% { transform: scaleY(0); transform-origin: bottom; } }

/* ---------- 分区通用 ---------- */
.section { position: relative; padding: 130px 0; border-top: 1px solid var(--line); }
.sec-head { margin-bottom: 70px; }
.sec-kicker {
  display: flex; align-items: center; gap: 14px;
  font-size: 13px; letter-spacing: .35em; color: var(--accent); margin-bottom: 22px;
}
.sec-kicker::before { content: ""; width: 30px; height: 1px; background: var(--accent); }
.sec-title { font-family: var(--title-font); font-weight: 400; font-size: clamp(30px, 3.2vw, 44px); letter-spacing: .06em; line-height: 1.4; }
.sec-desc { margin-top: 20px; color: var(--ink-dim); font-size: 15px; text-wrap: pretty; }

/* 大数字行 */
.stat-rows { border-top: 1px solid var(--line); }
.stat-row {
  display: flex; align-items: baseline; gap: 40px;
  padding: 42px 0; border-bottom: 1px solid var(--line);
}
.stat-row b {
  font-family: var(--title-font); font-weight: 400; flex: none;
  font-size: clamp(48px, 5vw, 72px); color: var(--accent); line-height: 1;
  min-width: 300px;
}
.stat-row b small { font-size: .45em; margin-left: 4px; color: var(--ink); }
.stat-row div h3 { font-size: 17px; font-weight: 600; }
.stat-row div p { font-size: 14px; color: var(--ink-faint); margin-top: 4px; }
.law-line { margin-top: 36px; font-size: 13px; color: var(--ink-faint); letter-spacing: .06em; }
.law-line span { margin-right: 26px; white-space: nowrap; }
.law-line span:hover { color: var(--accent); }

/* 服务矩阵：极简图标格 */
.mline-label {
  display: flex; align-items: baseline; gap: 18px; margin: 56px 0 24px;
}
.mline-label:first-of-type { margin-top: 0; }
.mline-label .no { font-family: var(--title-font); color: var(--accent); font-size: 15px; letter-spacing: .2em; }
.mline-label h3 { font-family: var(--title-font); font-weight: 400; font-size: 22px; letter-spacing: .08em; }
.mline-label p { margin-left: auto; font-size: 13px; color: var(--ink-faint); letter-spacing: .06em; }
.svc-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.svc-grid.cols3 { grid-template-columns: repeat(3, 1fr); }
.svc-grid.cols2 { grid-template-columns: repeat(2, 1fr); }
.svc {
  background: var(--bg); padding: 34px 28px; position: relative;
  display: flex; flex-direction: column; gap: 14px;
  transition: background .35s;
}
.svc:hover { background: #0E1622; }
.svc img { width: 46px; height: 46px; }
.svc .code { font-size: 12px; letter-spacing: .16em; color: var(--accent); }
.svc h4 { font-size: 17px; font-weight: 600; }
.svc .tagline { font-size: 13px; color: var(--ink-faint); }
.svc .flag {
  position: absolute; top: 20px; right: 20px;
  font-size: 11px; color: var(--accent); letter-spacing: .12em;
  border: 1px solid rgba(87,182,228,.4); border-radius: 999px; padding: 2px 10px;
}
.svc .arr { position: absolute; bottom: 22px; right: 24px; color: var(--ink-faint); transition: color .3s, transform .3s; }
.svc:hover .arr { color: var(--accent); transform: translateX(4px); }

/* 场景卡 */
.scene-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.scene-card {
  position: relative; border-radius: 14px; overflow: hidden; min-height: 290px;
  display: flex; flex-direction: column; justify-content: flex-end;
  padding: 28px; background-size: cover; background-position: center;
  border: 1px solid var(--line); transition: transform .35s, border-color .35s;
}
.scene-card::before {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(4,4,4,.25) 0%, rgba(4,4,4,.94) 80%);
  transition: opacity .35s;
}
.scene-card:hover { transform: translateY(-6px); border-color: rgba(87,182,228,.5); }
.scene-card > * { position: relative; }
.scene-card .no { font-family: var(--title-font); font-size: 14px; color: var(--accent); letter-spacing: .2em; }
.scene-card h4 { font-size: 18px; margin-top: 8px; font-weight: 600; }
.scene-card p { font-size: 13px; color: var(--ink-dim); margin-top: 6px; }

/* 客户墙 */
.proof-line {
  display: flex; gap: 70px; flex-wrap: wrap; margin-bottom: 56px;
}
.proof-line div b { font-family: var(--title-font); font-weight: 400; font-size: 44px; color: var(--accent); white-space: nowrap; }
.proof-line div > span { display: block; margin-top: 2px; font-size: 13px; color: var(--ink-faint); }
.client-wall { display: flex; flex-wrap: wrap; gap: 10px; }
.client-chip {
  font-size: 13px; color: var(--ink-dim);
  border: 1px solid var(--line); border-radius: 999px; padding: 8px 20px;
  transition: color .25s, border-color .25s;
}
.client-chip:hover { color: #fff; border-color: rgba(255,255,255,.4); }
.client-chip.hot { color: var(--accent); border-color: rgba(87,182,228,.45); }

/* 开始合作 */
.go-band { text-align: center; padding: 40px 0 20px; }
.go-band .kicker { font-size: 13px; letter-spacing: .35em; color: var(--accent); }
.go-band h3 {
  font-family: var(--title-font); font-weight: 400;
  font-size: clamp(30px, 3.4vw, 46px); letter-spacing: .1em; margin-top: 24px;
}
.go-band .tel {
  font-family: var(--title-font); font-weight: 400;
  font-size: clamp(34px, 4.6vw, 64px); color: var(--accent);
  margin-top: 22px; letter-spacing: .04em;
}
.go-band .addr { color: var(--ink-faint); font-size: 14px; margin-top: 20px; }
.go-band .hero-actions { margin-top: 40px; }
.flow-line {
  display: flex; justify-content: center; gap: 0; margin: 70px auto 0; max-width: 900px;
}
.flow-line div {
  flex: 1; text-align: center; position: relative; padding-top: 22px;
  font-size: 14px; color: var(--ink-dim);
}
.flow-line div::before {
  content: ""; position: absolute; top: 0; left: 50%; transform: translateX(-50%);
  width: 8px; height: 8px; border-radius: 50%; background: var(--accent);
}
.flow-line div::after {
  content: ""; position: absolute; top: 4px; left: calc(50% + 12px); right: calc(-50% + 12px); height: 1px;
  background: rgba(255,255,255,.18);
}
.flow-line div:last-child::after { display: none; }

/* ---------- 页脚 ---------- */
.footer { border-top: 1px solid var(--line); padding: 70px 0 44px; background: #020202; }
.footer-grid { display: flex; gap: 70px; flex-wrap: wrap; align-items: flex-start; justify-content: center; text-align: center; }
.footer img.logo { height: 28px; }
.footer .f-brand { width: 340px; max-width: 100%; text-align: center; }
.footer .f-brand img.logo { width: 238px; height: auto; display: block; margin: 0 auto; }
.footer .f-brand .f-tagline {
  font-family: "JinshanYun", "Microsoft YaHei", sans-serif;
  font-size: 36px; color: var(--ink); margin: 10px auto 0;
  width: 238px; white-space: nowrap;
  text-align: justify; text-align-last: justify;
}
.footer .f-brand .f-tagline .accent { color: var(--accent); }
.footer .f-brand .f-tagline-en {
  font-size: 11px; color: var(--ink-faint); margin: 6px auto 0;
  width: 238px; white-space: nowrap;
  text-align: justify; text-align-last: justify;
}
.footer .col h5 { font-size: 12px; color: var(--ink-faint); letter-spacing: .25em; margin-bottom: 16px; font-weight: 400; }
.footer .col p, .footer .col a { font-size: 13px; color: var(--ink-dim); display: block; margin-bottom: 8px; }
.footer .col a:hover { color: var(--accent); }
.footer-qr { width: 96px; height: 96px; border-radius: 10px; border: 1px solid rgba(255,255,255,.16); display: block; }
.footer .footer-qr { margin: 0 auto; }
.footer-base {
  margin-top: 56px; padding-top: 26px; border-top: 1px solid rgba(255,255,255,.06);
  font-size: 12px; color: var(--ink-faint); display: flex; gap: 26px; flex-wrap: wrap;
  justify-content: center; text-align: center;
}

/* ---------- 音效开关 ---------- */
.sfx-toggle {
  position: fixed; right: 26px; bottom: 26px; z-index: 120;
  width: 46px; height: 46px; border-radius: 50%;
  background: rgba(10, 10, 10, .6); backdrop-filter: blur(10px);
  border: 1px solid var(--line); color: var(--ink-dim);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; transition: color .3s, border-color .3s, transform .3s;
}
.sfx-toggle:hover { color: #fff; border-color: rgba(255, 255, 255, .4); transform: translateY(-2px); }
.sfx-toggle .slash { display: none; }
.sfx-toggle.muted .slash { display: block; }
.sfx-toggle.muted .w1, .sfx-toggle.muted .w2 { display: none; }
.sfx-toggle.locked { color: var(--ink-faint); border-style: dashed; animation: sfxPulse 2.2s ease-in-out infinite; }
@keyframes sfxPulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(87, 182, 228, .35); }
  50% { box-shadow: 0 0 0 10px rgba(87, 182, 228, 0); }
}
.sfx-toggle:not(.muted):not(.locked) { color: var(--accent); border-color: rgba(87, 182, 228, .45); }

/* ---------- 动效 ---------- */
.reveal { opacity: 0; transform: translateY(36px); transition: opacity .9s ease, transform .9s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .corona::before, .scroll-hint::after, .mega, .mega-word { animation: none !important; }
  .mega-word { opacity: 0; }
  .mega-word.en { opacity: 1; }
}

/* ---------- 内页组件 ---------- */
.page-hero {
  position: relative; padding: 210px 0 100px; overflow: hidden;
  background: radial-gradient(900px 420px at 50% 26%, #0D1420 0%, #040404 65%);
}
.page-hero h1 {
  font-family: var(--title-font); font-weight: 400;
  font-size: clamp(38px, 5vw, 64px); letter-spacing: .1em; line-height: 1.35;
}
.page-hero p { margin-top: 24px; max-width: 700px; color: var(--ink-dim); font-size: 16px; }

.sub-label { display: flex; align-items: baseline; gap: 18px; margin: 72px 0 28px; }
.sub-label .no { font-family: var(--title-font); color: var(--accent); font-size: 15px; letter-spacing: .2em; }
.sub-label h3 { font-family: var(--title-font); font-weight: 400; font-size: 24px; letter-spacing: .08em; }

.hl-chips { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 40px; }
.hl-chips span {
  font-size: 13px; color: var(--accent);
  border: 1px solid rgba(87, 182, 228, .35); border-radius: 999px; padding: 8px 20px;
}

.presence-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.presence-card {
  border: 1px solid var(--line); border-radius: 14px; padding: 32px 28px;
  background: var(--card); transition: border-color .3s, transform .3s;
}
.presence-card:hover { border-color: rgba(87, 182, 228, .45); transform: translateY(-4px); }
.presence-card .tag { font-size: 12px; letter-spacing: .2em; color: var(--accent); }
.presence-card h4 { font-family: var(--title-font); font-weight: 400; font-size: 21px; margin: 14px 0 10px; letter-spacing: .05em; }
.presence-card p { font-size: 14px; color: var(--ink-dim); }
.presence-card .loc-tel { margin-top: 12px; font-size: 15px; color: var(--ink); letter-spacing: .04em; }
.presence-card .map-link {
  display: inline-block; margin-top: 16px; font-size: 13px; color: var(--accent);
  text-decoration: none; border: 1px solid rgba(87, 182, 228, .4); border-radius: 999px;
  padding: 7px 16px; transition: background .3s, border-color .3s;
}
.presence-card .map-link:hover { background: rgba(87, 182, 228, .12); border-color: rgba(87, 182, 228, .7); }

.follow-band {
  margin-top: 22px; border: 1px solid var(--line); border-radius: 14px; padding: 26px 32px;
  background: var(--card); display: flex; align-items: center; gap: 26px;
}
.follow-band .footer-qr { width: 88px; height: 88px; flex: none; }
.follow-band h4 { font-family: var(--title-font); font-weight: 400; font-size: 18px; letter-spacing: .05em; margin-bottom: 8px; }
.follow-band p { font-size: 13px; color: var(--ink-dim); }

.photo-strip { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-top: 40px; }
.photo-strip figure { min-width: 0; }
.photo-strip img {
  width: 100%; aspect-ratio: 4 / 3; object-fit: cover;
  border-radius: 10px; border: 1px solid var(--line); filter: saturate(.92);
  transition: border-color .3s;
}
.photo-strip img:hover { border-color: rgba(87, 182, 228, .45); }
.photo-strip figcaption { font-size: 12px; color: var(--ink-faint); margin-top: 8px; letter-spacing: .04em; }
.photo-strip.cols4 { grid-template-columns: repeat(4, 1fr); }

.note-line { margin-top: 28px; font-size: 13px; color: var(--ink-faint); line-height: 1.9; }

.cert-wall { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.cert-wall.wide { grid-template-columns: repeat(2, 1fr); margin-top: 14px; }
.cert-wall.honors { grid-template-columns: repeat(5, 1fr); margin-top: 14px; }
.cert-wall.honors img { aspect-ratio: 7 / 5; object-fit: cover; }
.cert-card {
  border: 1px solid var(--line); border-radius: 12px; overflow: hidden;
  background: var(--card); transition: transform .3s, border-color .3s;
}
.cert-card:hover { transform: translateY(-4px); border-color: rgba(87, 182, 228, .45); }
.cert-card img { width: 100%; display: block; }
.cert-card .cap { padding: 12px 14px; font-size: 13px; color: var(--ink-dim); }

.sys-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.sys-card { border: 1px solid var(--line); border-radius: 14px; padding: 34px 32px; background: var(--card); }
.sys-card .sys-tag { font-size: 12px; letter-spacing: .25em; color: var(--accent); margin-bottom: 14px; }
.sys-card h4 { font-family: var(--title-font); font-weight: 400; font-size: 20px; letter-spacing: .04em; margin-bottom: 12px; }
.sys-card p { font-size: 14px; color: var(--ink-dim); line-height: 1.9; }

.timeline { border-top: 1px solid var(--line); }
.tl-item { display: flex; align-items: baseline; gap: 40px; padding: 26px 0; border-bottom: 1px solid var(--line); }
.tl-item .year {
  flex: none; width: 84px; text-align: right;
  font-family: var(--title-font); font-weight: 400; font-size: 26px; color: var(--accent);
}
.tl-item .txt { position: relative; padding-left: 32px; border-left: 1px solid var(--line); }
.tl-item .txt::before {
  content: ""; position: absolute; left: -5px; top: 8px;
  width: 9px; height: 9px; border-radius: 50%; background: var(--accent);
  box-shadow: 0 0 12px rgba(87, 182, 228, .6);
}
.tl-item .txt p { font-size: 15px; color: var(--ink-dim); line-height: 1.8; }

.letter {
  max-width: 840px; margin: 0 auto;
  border: 1px solid var(--line); border-radius: 18px;
  padding: 76px 84px;
  background: linear-gradient(180deg, #0B0B0D 0%, #070708 100%);
}
.letter p { font-size: 15.5px; line-height: 2.15; color: var(--ink-dim); margin-bottom: 1.5em; }
.letter p:first-of-type::first-letter {
  font-family: var(--title-font); font-size: 2.7em; color: var(--accent);
  float: left; line-height: 1; margin: 6px 14px 0 0;
}
.letter .sign { text-align: right; margin-top: 44px; }
.letter .sign .name { font-family: var(--title-font); font-weight: 400; font-size: 32px; letter-spacing: .25em; }
.letter .sign .role { font-size: 13px; color: var(--ink-faint); margin-top: 8px; letter-spacing: .1em; }

/* 方法论四阶段循环 */
.loop-line { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; position: relative; }
.loop-node {
  position: relative; border: 1px solid var(--line); border-radius: 14px;
  padding: 32px 26px; background: var(--card);
}
.loop-node:not(:last-child)::after {
  content: "→"; position: absolute; right: -18px; top: 40px; z-index: 2;
  color: var(--accent); font-size: 16px;
}
.loop-node .loop-no { font-family: var(--title-font); font-size: 13px; letter-spacing: .2em; color: var(--accent); }
.loop-node h4 { font-family: var(--title-font); font-weight: 400; font-size: 24px; letter-spacing: .08em; margin: 12px 0 8px; }
.loop-node .loop-key { font-size: 14px; color: var(--ink); margin-bottom: 10px; }
.loop-node p { font-size: 13px; color: var(--ink-faint); line-height: 1.8; }

/* 场景速查：手风琴 */
.scn-list { border-top: 1px solid var(--line); }
.scn-item { border-bottom: 1px solid var(--line); }
.scn-head {
  width: 100%; display: flex; align-items: center; gap: 28px;
  padding: 34px 0; background: none; border: none; cursor: pointer;
  color: var(--ink); text-align: left; font-family: inherit;
}
.scn-no {
  flex: none; font-family: var(--title-font); font-weight: 400;
  font-size: 15px; letter-spacing: .2em; color: var(--accent);
}
.scn-title { font-size: clamp(19px, 2vw, 26px); font-weight: 600; letter-spacing: .04em; transition: color .3s; }
.scn-head:hover .scn-title { color: var(--accent); }
.scn-arrow {
  margin-left: auto; flex: none; width: 12px; height: 12px;
  border-right: 1.5px solid var(--ink-faint); border-bottom: 1.5px solid var(--ink-faint);
  transform: rotate(45deg); transition: transform .35s, border-color .35s;
}
.scn-item.open .scn-arrow { transform: rotate(225deg); border-color: var(--accent); }
.scn-body {
  display: grid; grid-template-columns: 1fr 340px; gap: 44px;
  max-height: 0; overflow: hidden; opacity: 0;
  transition: max-height .5s ease, opacity .4s ease, padding .4s ease;
  padding: 0 0 0 0;
}
.scn-item.open .scn-body { max-height: 520px; opacity: 1; padding: 6px 0 44px; }
.scn-desc { font-size: 15px; color: var(--ink-dim); line-height: 1.9; max-width: 640px; }
.scn-who, .scn-logic { margin-top: 18px; font-size: 14px; color: var(--ink-faint); line-height: 1.8; }
.scn-who b, .scn-logic b {
  display: inline-block; margin-right: 12px; font-weight: 400;
  font-size: 12px; letter-spacing: .2em; color: var(--accent);
}
.scn-combo { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }
.scn-combo a {
  font-size: 14px; color: var(--ink);
  border: 1px solid rgba(255, 255, 255, .22); border-radius: 999px; padding: 10px 24px;
  transition: all .3s;
}
.scn-combo a:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }
.scn-img {
  position: relative; border-radius: 14px; background-size: cover; background-position: center;
  border: 1px solid var(--line); min-height: 220px; overflow: hidden;
}
.scn-img::after {
  content: attr(data-num); position: absolute; right: 20px; bottom: 6px;
  font-family: var(--title-font); font-size: 92px; line-height: 1;
  color: rgba(255, 255, 255, .14); letter-spacing: .02em;
}

/* ---------- 服务详情页组件 ---------- */
.crumbs { font-size: 13px; color: var(--ink-faint); margin-bottom: 30px; letter-spacing: .04em; }
.crumbs a { color: var(--ink-faint); }
.crumbs a:hover { color: var(--accent); }
.crumbs span { margin: 0 10px; opacity: .5; }

.flag-chip { display: inline-block; font-size: 12px; letter-spacing: .22em; color: #06203C; background: var(--accent); border-radius: 999px; padding: 7px 18px; margin-bottom: 24px; font-weight: 600; }

.svc-hero-flex { display: flex; align-items: flex-end; gap: 60px; }
.svc-hero-flex > div:first-child { flex: 1; min-width: 0; }
.svc-hero-icon { flex: none; width: 120px; height: 120px; opacity: .92; }

.cap-list { border-top: 1px solid var(--line); }
.cap-item { display: flex; gap: 26px; padding: 24px 0; border-bottom: 1px solid var(--line); align-items: baseline; }
.cap-item .no { font-family: var(--title-font); color: var(--accent); font-size: 15px; letter-spacing: .15em; min-width: 36px; flex: none; }
.cap-item p { font-size: 15px; color: var(--ink-dim); line-height: 1.85; }
.cap-item p b { color: var(--ink); font-weight: 600; }

.loop-line.cols5 { grid-template-columns: repeat(5, 1fr); }
.scene-grid.cols2 { grid-template-columns: repeat(2, 1fr); }
.scene-grid.cols4 { grid-template-columns: repeat(4, 1fr); }

.dlv-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: 14px; overflow: hidden; }
.dlv { background: #070707; padding: 24px 26px; display: flex; gap: 16px; }
.dlv::before { content: "✓"; color: var(--accent); font-size: 16px; margin-top: 2px; flex: none; }
.dlv b { display: block; font-size: 15px; font-weight: 600; color: #EDEDED; }
.dlv span { display: block; font-size: 13px; color: var(--ink-faint); margin-top: 5px; line-height: 1.7; }
.dlv-grid > .dlv:last-child:nth-child(odd) { grid-column: 1 / -1; }

.spec-band { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: 14px; overflow: hidden; }
.spec-band.cols3 { grid-template-columns: repeat(3, 1fr); }
.spec-band > div { background: #070707; padding: 26px 24px; }
.spec-band b { font-family: var(--title-font); font-weight: 400; font-size: clamp(24px, 2vw, 30px); color: var(--accent); white-space: nowrap; }
.spec-band span { display: block; margin-top: 8px; font-size: 13px; color: var(--ink-faint); line-height: 1.6; }

.case-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.case-card { border: 1px solid var(--line); border-radius: 14px; padding: 32px 30px; background: var(--card); }
.case-card .case-tag { font-size: 12px; letter-spacing: .25em; color: var(--accent); }
.case-card h4 { font-family: var(--title-font); font-weight: 400; font-size: 20px; margin: 12px 0 4px; letter-spacing: .04em; }
.case-kv { margin-top: 16px; }
.case-kv b { display: block; font-size: 12px; letter-spacing: .2em; color: var(--ink-faint); margin-bottom: 5px; font-weight: 400; }
.case-kv p { font-size: 14px; color: var(--ink-dim); line-height: 1.8; }

.ind-list { border-top: 1px solid var(--line); }
.ind-item { display: grid; grid-template-columns: 170px 1fr; gap: 28px; padding: 22px 0; border-bottom: 1px solid var(--line); align-items: baseline; }
.ind-item > b { font-size: 15px; color: var(--ink); font-weight: 600; }
.ind-item p { font-size: 14px; color: var(--ink-dim); line-height: 1.8; }

.svc-pn { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.svc-pn a { border: 1px solid var(--line); border-radius: 14px; padding: 26px 28px; background: var(--card); transition: border-color .3s, transform .3s; }
.svc-pn a:hover { border-color: rgba(87,182,228,.45); transform: translateY(-3px); }
.svc-pn .pn-dir { font-size: 12px; letter-spacing: .25em; color: var(--ink-faint); }
.svc-pn h4 { font-size: 17px; font-weight: 600; margin-top: 10px; color: var(--ink); }
.svc-pn .pn-code { font-size: 12px; color: var(--accent); letter-spacing: .15em; margin-top: 6px; }
.svc-pn a.next { text-align: right; }

/* ---------- 响应式 ---------- */
@media (max-width: 1100px) {
  .wrap, .nav-inner { padding: 0 28px; }
  .svc-grid { grid-template-columns: repeat(2, 1fr); }
  .scene-grid, .scene-grid.cols4 { grid-template-columns: repeat(2, 1fr); }
  .spec-band, .spec-band.cols3 { grid-template-columns: repeat(2, 1fr); }
  .loop-line.cols5 { grid-template-columns: repeat(3, 1fr); }
  .svc-hero-flex { gap: 36px; }
  .svc-hero-icon { width: 90px; height: 90px; }
  .stat-row { flex-wrap: wrap; gap: 14px; }
  .stat-row b { min-width: 0; }
  .photo-strip, .photo-strip.cols4 { grid-template-columns: repeat(2, 1fr); }
  .cert-wall { grid-template-columns: repeat(2, 1fr); }
  .cert-wall.honors { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 720px) {
  .nav-menu { display: none; }
  .nav-menu.open {
    display: flex; flex-direction: column; position: absolute; top: 84px; left: 0; right: 0;
    background: rgba(4,4,4,.97); padding: 22px 28px 30px; gap: 20px;
    border-bottom: 1px solid var(--line); margin: 0;
  }
  .nav-toggle {
    display: block; margin-left: auto; background: none; border: 1px solid var(--line);
    color: var(--ink); font-size: 13px; padding: 8px 18px; border-radius: 999px;
  }
  .hero-copy { top: 64%; }
  .hero-copy .cn-name { letter-spacing: .3em; text-indent: .3em; font-size: 13px; }
  .mega-word { font-size: 104px; }
  .section { padding: 90px 0; }
  .svc-grid, .svc-grid.cols3, .scene-grid, .scene-grid.cols2, .scene-grid.cols4 { grid-template-columns: 1fr; }
  .proof-line { gap: 30px; }
  .flow-line { flex-wrap: wrap; gap: 26px; }
  .flow-line div { flex: 1 1 40%; }
  .flow-line div::after { display: none; }
  .page-hero { padding: 160px 0 70px; }
  .presence-grid, .sys-grid { grid-template-columns: 1fr; }
  .photo-strip, .photo-strip.cols4 { grid-template-columns: repeat(2, 1fr); }
  .cert-wall { grid-template-columns: repeat(2, 1fr); }
  .cert-wall.wide { grid-template-columns: 1fr; }
  .cert-wall.honors { grid-template-columns: repeat(2, 1fr); }
  .tl-item { gap: 22px; }
  .tl-item .year { width: 60px; font-size: 20px; }
  .tl-item .txt { padding-left: 22px; }
  .letter { padding: 44px 26px; }
  .scn-body { grid-template-columns: 1fr; }
  .scn-item.open .scn-body { max-height: 900px; }
  .scn-img { min-height: 160px; }
  .loop-line { grid-template-columns: 1fr; }
  .loop-node:not(:last-child)::after { content: "↓"; right: 26px; top: auto; bottom: -20px; }
  .dlv-grid, .case-grid, .svc-pn { grid-template-columns: 1fr; }
  .spec-band, .spec-band.cols3 { grid-template-columns: repeat(2, 1fr); }
  .ind-item { grid-template-columns: 1fr; gap: 6px; padding: 18px 0; }
  .svc-hero-icon { display: none; }
  .cap-item { gap: 16px; }
}