/* ============================================================
   梦限 MENGXIAN — 官网样式
   语言：白 · 近黑 · 一点青；直角、细线、断角方框。
   色与形都从标识长出来，不用圆角、不用阴影去软化。
   ============================================================ */

/* ---------- 0. 字体（自托管子集，不依赖任何字体 CDN）
   MiSans —— 中文主体；JetBrains Mono —— 编号与拉丁标注。
   ---------- */
@font-face {
  font-family: "MiSans";
  src: url("assets/fonts/misans-400.woff2") format("woff2");
  font-weight: 400;
  font-display: swap;
}
@font-face {
  font-family: "MiSans";
  src: url("assets/fonts/misans-500.woff2") format("woff2");
  font-weight: 500;
  font-display: swap;
}
@font-face {
  font-family: "MiSans";
  src: url("assets/fonts/misans-700.woff2") format("woff2");
  font-weight: 700;
  font-display: swap;
}
@font-face {
  font-family: "MiSans";
  src: url("assets/fonts/misans-900.woff2") format("woff2");
  font-weight: 900;
  font-display: swap;
}
@font-face {
  font-family: "JetBrains Mono";
  src: url("assets/fonts/jetbrains-mono-400.woff2") format("woff2");
  font-weight: 400;
  font-display: swap;
}
@font-face {
  font-family: "JetBrains Mono";
  src: url("assets/fonts/jetbrains-mono-500.woff2") format("woff2");
  font-weight: 500;
  font-display: swap;
}

/* ---------- 1. 设计令牌 ---------- */
:root {
  --bg: #FFFFFF;
  --bg-2: #F3F5F8;
  --fg: #0E1015;
  --fg-2: #565C69;
  --fg-3: #868C99;

  --line: #E2E5EA;
  --line-2: #C4C9D2;

  --cyan: #00C6D9;        /* 只做填充：色块、角、缺口 */
  --cyan-ink: #0A93A3;    /* 白底上可读的青色：细线与小字 */

  --font-sans: "MiSans", "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Consolas, monospace;

  --ease: cubic-bezier(.22, .61, .36, 1);
  --wrap: 1720px;
  --pad: clamp(20px, 4vw, 64px);

  --fs-h1: clamp(40px, 6.4vw, 86px);
  --fs-h2: clamp(28px, 3.7vw, 50px);
  --fs-h3: 20px;
  --fs-lead: clamp(17px, 1.35vw, 20px);
  --fs-body: 16.5px;
  --fs-sm: 14.5px;
  --fs-mono: 11px;
}

/* ---------- 2. 基础 ---------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 84px;
  background: var(--bg);
}

body {
  margin: 0;
  background: transparent;
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  font-weight: 400;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* 背景光场：铺满整页的线格，鼠标附近被点亮 */
#field {
  position: fixed;
  inset: 0;
  z-index: -1;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, h4, p, dl, dd, ul, ol, figure { margin: 0; }
ul, ol { padding: 0; list-style: none; }
button { font: inherit; color: inherit; }
code {
  font-family: var(--font-mono);
  font-size: .86em;
  padding: 1px 5px;
  background: var(--bg-2);
  border: 1px solid var(--line);
  white-space: nowrap;
}
::selection { background: var(--cyan); color: #06171A; }
:focus-visible { outline: 2px solid var(--cyan-ink); outline-offset: 3px; }

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--pad);
}

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 200;
  padding: 12px 20px;
  background: var(--fg);
  color: #fff;
  font-size: var(--fs-sm);
}
.skip:focus { left: 12px; top: 12px; }

/* ---------- 3. 顶栏 ---------- */
.topbar {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 90;
  background: rgba(255, 255, 255, .88);
  backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s var(--ease), background .3s var(--ease);
}
.topbar.is-stuck {
  border-bottom-color: var(--line);
  background: rgba(255, 255, 255, .96);
}
.topbar-in {
  display: flex;
  align-items: center;
  gap: 28px;
  height: 72px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  min-height: 44px;
  margin-right: auto;
  color: var(--fg);
}
.brand-mark { width: 30px; height: 30px; flex: none; }
.brand-mark-lg { width: 40px; height: 40px; }
.brand-txt { display: flex; align-items: baseline; gap: 8px; }
.brand-txt b { font-size: 19px; font-weight: 900; letter-spacing: .06em; }
.brand-txt i {
  font-family: var(--font-mono);
  font-style: normal;
  font-size: 9.5px;
  letter-spacing: .18em;
  color: var(--fg-3);
}

.nav { display: flex; gap: 30px; }
.nav a {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--fg-2);
  transition: color .2s var(--ease);
}
.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 12px;
  height: 2px;
  background: var(--cyan-ink);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .28s var(--ease);
}
.nav a:hover, .nav a.is-active { color: var(--fg); }
.nav a:hover::after, .nav a.is-active::after { transform: scaleX(1); }

.burger {
  display: none;
  width: 44px;
  height: 44px;
  margin-right: -8px;
  padding: 0;
  background: none;
  border: 0;
  cursor: pointer;
  position: relative;
}
.burger span {
  position: absolute;
  left: 11px;
  width: 22px;
  height: 1.5px;
  background: var(--fg);
  transition: transform .3s var(--ease), opacity .2s var(--ease);
}
.burger span:first-child { top: 18px; }
.burger span:last-child { top: 25px; }
.burger[aria-expanded="true"] span:first-child { transform: translateY(3.5px) rotate(45deg); }
.burger[aria-expanded="true"] span:last-child { transform: translateY(-3.5px) rotate(-45deg); }

.drawer {
  position: fixed;
  inset: 72px 0 0 0;
  z-index: 89;
  padding: 34px var(--pad) 40px;
  background: var(--bg);
  overflow-y: auto;
}
.drawer[hidden] { display: none; }
.drawer-nav { display: grid; }
.drawer-nav a {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
  font-size: 26px;
  font-weight: 700;
}
.drawer-nav em {
  font-family: var(--font-mono);
  font-style: normal;
  font-size: 11px;
  color: var(--cyan-ink);
}
.drawer-cta { margin-top: 30px; width: 100%; }
.drawer-foot {
  margin-top: 26px;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 2;
  color: var(--fg-3);
}

/* ---------- 4. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 52px;
  padding: 0 26px;
  border: 1px solid var(--fg);
  background: var(--fg);
  color: #fff;
  font-size: var(--fs-sm);
  font-weight: 500;
  letter-spacing: .02em;
  cursor: pointer;
  transition: background .22s var(--ease), color .22s var(--ease), border-color .22s var(--ease);
}
.btn .arrow { font-family: var(--font-mono); font-size: 13px; transition: transform .26s var(--ease); }
.btn:hover { background: var(--cyan); border-color: var(--cyan); color: #06171A; }
.btn:hover .arrow { transform: translate(3px, -3px); }
.btn-sm { min-height: 40px; padding: 0 18px; font-size: 13.5px; }
.btn-block { width: 100%; }
.btn-ghost { background: transparent; color: var(--fg); border-color: var(--line-2); }
.btn-ghost:hover { background: var(--fg); border-color: var(--fg); color: #fff; }

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-height: 44px;
  font-size: var(--fs-sm);
  color: var(--fg-2);
  border-bottom: 1px solid var(--line-2);
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.link-arrow::after { content: "→"; font-family: var(--font-mono); transition: transform .26s var(--ease); }
.link-arrow:hover { color: var(--fg); border-bottom-color: var(--cyan-ink); }
.link-arrow:hover::after { transform: translateX(4px); }

/* ---------- 5. 通用标注与标题 ---------- */
.tag {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: .15em;
  text-transform: uppercase;
  color: var(--fg-2);
}
.tag-n {
  padding: 2px 6px;
  background: var(--fg);
  color: #fff;
  font-size: 9.5px;
  letter-spacing: .1em;
}
.tag .en { color: var(--fg-3); letter-spacing: .16em; }

.en {
  font-family: var(--font-mono);
  font-weight: 400;
  letter-spacing: .14em;
  color: var(--fg-3);
  font-size: .92em;
}

.u {
  background-image: linear-gradient(var(--cyan), var(--cyan));
  background-repeat: no-repeat;
  background-size: 100% .26em;
  background-position: 0 92%;
}

.sec { padding: clamp(76px, 9vw, 132px) 0; border-top: 1px solid var(--line); }
/* 灰底带一点透明，让背景线格透上来（文字对比度不受影响） */
.sec-paper { background: rgba(228, 232, 238, .60); }
.sec-head { max-width: 820px; margin-bottom: clamp(42px, 5vw, 72px); }
.sec-head h2 {
  margin: 22px 0 0;
  font-size: var(--fs-h2);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -.03em;
}
.sec-head .lead {
  margin-top: 22px;
  font-size: var(--fs-lead);
  line-height: 1.9;
  color: var(--fg-2);
}

/* ---------- 6. 首屏 ---------- */
.hero {
  position: relative;
  padding-top: 116px;
  padding-bottom: clamp(44px, 5vw, 68px);
  overflow: hidden;
  isolation: isolate;
}
/* 循环扫过的一道青光：让首屏一直在动，但不抢字 */
.hero::after {
  content: "";
  position: absolute;
  top: -10%;
  bottom: -10%;
  left: 0;
  width: 38%;
  background: linear-gradient(100deg,
      transparent 0%,
      rgba(0, 198, 217, .045) 38%,
      rgba(0, 198, 217, .10) 50%,
      rgba(0, 198, 217, .045) 62%,
      transparent 100%);
  transform: translateX(-140%) skewX(-12deg);
  animation: heroSweep 13s cubic-bezier(.45, .05, .55, .95) infinite;
  pointer-events: none;
  z-index: 0;
}
@keyframes heroSweep {
  0%   { transform: translateX(-140%) skewX(-12deg); }
  62%  { transform: translateX(300%) skewX(-12deg); }
  100% { transform: translateX(300%) skewX(-12deg); }
}
.hero > .wrap { position: relative; z-index: 1; }

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 520px);
  gap: clamp(36px, 4.5vw, 96px);
  align-items: center;
}

.hero-h1 {
  margin: 26px 0 0;
  font-size: var(--fs-h1);
  font-weight: 900;
  line-height: 1.02;
  letter-spacing: -.045em;
}
.hero-h1 .line { display: block; overflow: hidden; }
.hero-h1 .line > span {
  display: block;
  transform: translateY(102%);
  animation: rise 1s var(--ease) forwards;
}
.hero-h1 .line:nth-child(2) > span { animation-delay: .09s; }
@keyframes rise { to { transform: translateY(0); } }

.hero-lead {
  max-width: 600px;
  margin-top: 28px;
  font-size: var(--fs-lead);
  line-height: 1.9;
  color: var(--fg-2);
}
.hero-lead b { font-weight: 700; color: var(--fg); border-bottom: 1.5px solid var(--cyan); padding-bottom: 1px; }

.hero-note {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 14px;
  font-size: 16px;
  color: var(--fg);
}
.hero-note::before { content: ""; width: 20px; height: 2px; background: var(--cyan); flex: none; }
.hero-note b { font-weight: 700; }

.hero-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 26px;
  margin-top: 36px;
}

.hero-meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, auto));
  gap: 0 clamp(24px, 3.6vw, 54px);
  justify-content: start;
  margin-top: 42px;
  padding-top: 20px;
  border-top: 1px solid var(--line-2);
}
.hero-meta div { display: flex; flex-direction: column; gap: 3px; }
.hero-meta dt {
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: .16em;
  color: var(--fg-3);
}
.hero-meta dd { font-size: var(--fs-sm); font-weight: 500; color: var(--fg); }
.hero-meta .wx-inline { font-family: var(--font-mono); font-size: 13.5px; letter-spacing: .01em; }

/* 首屏视觉：标识几何的放大稿（12 秒画一遍，循环） */
.hero-art {
  margin: 0;
  transform: translate3d(var(--px, 0px), var(--py, 0px), 0);
  transition: transform .6s var(--ease);
  will-change: transform;
}
.scheme {
  width: 100%;
  height: auto;
  color: var(--fg);
  overflow: visible;
}
.sc-frame line,
.sc-corner line {
  stroke-dasharray: 900;
  stroke-dashoffset: 900;
  animation: drawLoop 12s var(--ease) infinite;
}
.sc-corner line { animation-delay: .45s; }
@keyframes drawLoop {
  0%        { stroke-dashoffset: 900; }
  14%       { stroke-dashoffset: 0; }
  88%       { stroke-dashoffset: 0; }
  92%, 100% { stroke-dashoffset: 900; }
}
/* 一轮画完整张图纸淡出再从头来，避免擦除时碎成几段 */
.sc-frame,
.sc-corner,
.sc-n,
.sc-v { animation: inkFade 12s linear infinite; }
@keyframes inkFade {
  0%, 85%   { opacity: 1; }
  92%, 100% { opacity: 0; }
}

.sc-in { opacity: 0; animation: listLoop 12s var(--ease) infinite; }
.sc-in-1 { animation-delay: .45s; }
.sc-in-2 { animation-delay: .60s; }
.sc-in-3 { animation-delay: .75s; }
@keyframes listLoop {
  0%, 21%    { opacity: 0; }
  29%, 85%   { opacity: 1; }
  92%, 100%  { opacity: 0; }
}
.sc-dot { opacity: 0; animation: listLoop 12s var(--ease) 1s infinite; }

/* 巡边光点：沿断角方框跑一圈 */
.sc-run {
  offset-path: path("M392 56 H512 V512 H56 V56 H368");
  offset-rotate: 0deg;
  animation: runPath 12s linear infinite, inkFade 12s linear infinite;
}
@keyframes runPath {
  from { offset-distance: 0%; }
  to   { offset-distance: 100%; }
}

.sc-n, .sc-v {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  fill: var(--fg-3);
}
.sc-list line { stroke: var(--line-2); stroke-width: 1; }
.sc-i {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: .1em;
  fill: var(--cyan-ink);
}
.sc-t {
  font-family: var(--font-sans);
  font-size: 18px;
  font-weight: 500;
  letter-spacing: .01em;
  fill: var(--fg);
}

.scheme-cap {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--line-2);
  font-size: 12.5px;
  color: var(--fg-2);
}
.scheme-cap .en { font-size: 9px; letter-spacing: .2em; }

/* 数据带 */
.statband {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-top: clamp(40px, 4.4vw, 60px);
  border-top: 2px solid var(--fg);
}
.statband li { padding: 22px 22px 0 0; }
.statband li + li { padding-left: 22px; border-left: 1px solid var(--line); }
.statband .num {
  display: block;
  font-size: clamp(34px, 3.6vw, 48px);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -.04em;
}
.statband .num em {
  margin-left: 6px;
  font-family: var(--font-mono);
  font-style: normal;
  font-size: 13px;
  font-weight: 400;
  letter-spacing: .1em;
  color: var(--cyan-ink);
}
.statband span {
  display: block;
  margin-top: 12px;
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--fg-2);
}

/* ---------- 7. 问题 ---------- */
.probs {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(24px, 3.4vw, 52px);
}
.prob { padding-top: 20px; border-top: 2px solid var(--fg); }
.prob-n {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--cyan-ink);
}
.prob h3 {
  margin-top: 16px;
  font-size: var(--fs-h3);
  font-weight: 700;
  line-height: 1.45;
  letter-spacing: -.01em;
}
.prob p { margin-top: 12px; font-size: 16px; line-height: 1.9; color: var(--fg-2); }

/* ---------- 8. 服务 ---------- */
/* 每块左右各留一圈内边距：块本身用负外边距向外撑开同样的距离，
   这样文字仍与上方标题同一条左基线，又不会顶着块/分隔线的边。
   —— 直接给 li 加 padding 会把文字整体推右，和标题错位。 */
.svc {
  --svc-bleed: clamp(12px, 2.2vw, 32px);
  border-top: 2px solid var(--fg);
  margin-inline: calc(-1 * var(--svc-bleed));
}
.svc li {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr) minmax(0, 320px);
  gap: clamp(18px, 2.6vw, 40px);
  padding: 32px var(--svc-bleed);
  border-bottom: 1px solid var(--line);
  transition: background .3s var(--ease);
}
.svc li:hover { background: rgba(255, 255, 255, .72); }
.svc-n {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--fg-3);
  padding-top: 4px;
}
.svc-main h3 { font-size: 22px; font-weight: 700; letter-spacing: -.02em; }
.svc-main p { margin-top: 10px; font-size: 16px; line-height: 1.9; color: var(--fg-2); }
.svc-out {
  padding-left: 20px;
  border-left: 1px solid var(--line-2);
  font-size: 15px;
  line-height: 1.85;
  color: var(--fg);
}
.svc-out span {
  display: block;
  margin-bottom: 6px;
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--cyan-ink);
}

/* ---------- 9. 方法 ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--line-2);
}
.steps li { position: relative; padding: 30px 24px 0 0; }
.steps li + li { padding-left: 24px; border-left: 1px solid var(--line); }
.step-dot {
  position: absolute;
  top: -5px;
  left: 0;
  width: 9px;
  height: 9px;
  background: var(--fg);
}
.steps li + li .step-dot { left: 24px; }
.steps li:first-child .step-dot { background: var(--cyan); }
.step-n {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .16em;
  color: var(--fg-3);
}
.step-n em {
  font-style: normal;
  margin-left: 6px;
  padding: 1px 5px;
  border: 1px solid var(--line-2);
  color: var(--fg-2);
}
.steps h3 { margin-top: 16px; font-size: 21px; font-weight: 700; letter-spacing: -.02em; }
.steps p { margin-top: 10px; font-size: 16px; line-height: 1.85; color: var(--fg-2); }

/* ---------- 10. 适合谁 ---------- */
.fit {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(24px, 3.4vw, 54px);
}
.fit-col { padding-top: 20px; border-top: 2px solid var(--fg); }
.fit-no { border-top-color: var(--line-2); }
.fit-col h3 { display: flex; align-items: center; gap: 10px; font-size: 18px; font-weight: 700; }
.fit-col .mk {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  font-family: var(--font-mono);
  font-size: 11px;
  border: 1px solid var(--fg);
}
.fit-no .mk { border-color: var(--line-2); color: var(--fg-3); }
.fit-yes .mk { background: var(--cyan); border-color: var(--cyan); color: #06171A; }
.fit-col ul { margin-top: 18px; }
.fit-col li {
  position: relative;
  padding-left: 18px;
  margin-bottom: 12px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--fg-2);
}
.fit-col li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .78em;
  width: 6px;
  height: 1px;
  background: var(--line-2);
}
.fit-yes li::before { background: var(--cyan-ink); }

.sectors {
  margin-top: clamp(48px, 5.5vw, 76px);
  padding-top: 18px;
  border-top: 1px solid var(--line);
}
.sectors-cap {
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: .16em;
  color: var(--fg-3);
}
.sectors ul { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.sectors li {
  padding: 6px 12px;
  border: 1px solid var(--line-2);
  font-size: 13px;
  color: var(--fg);
  background: var(--bg);
}

/* ---------- 11. 标识释义 ---------- */
.identity {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(28px, 4vw, 64px);
  align-items: center;
  margin-top: clamp(56px, 6vw, 88px);
  padding-top: clamp(40px, 4vw, 56px);
  border-top: 1px solid var(--line);
}
.id-plate { padding: clamp(20px, 2.4vw, 32px); background: transparent; border: 1px solid var(--line-2); }
.id-plate img { width: 100%; height: auto; }
.id-cap {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: .2em;
  color: var(--fg-3);
}
.id-copy h3 { font-size: clamp(22px, 2.3vw, 30px); font-weight: 900; letter-spacing: -.03em; }
.id-copy p { margin-top: 16px; font-size: 16.5px; line-height: 1.9; color: var(--fg-2); }
.id-slogan { font-size: 20px !important; font-weight: 900; color: var(--fg) !important; letter-spacing: -.02em; }
.id-slogan::after {
  content: "";
  display: inline-block;
  width: 26px;
  height: 3px;
  margin-left: 10px;
  background: var(--cyan);
  vertical-align: .18em;
}

/* ---------- 12. 公司信息 ---------- */
.company { margin-top: clamp(48px, 5vw, 72px); padding-top: 22px; border-top: 2px solid var(--fg); }
.company dl { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 24px; }
.company dt {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--fg-3);
}
.company dt .en { font-size: 8.5px; letter-spacing: .14em; color: var(--line-2); }
.company dd { margin-top: 8px; font-size: 15.5px; font-weight: 500; }
/* <address> 只借语义，不要浏览器的斜体 */
.company address,
.foot-company address { font-style: normal; }

/* ---------- 12b. 常见问题
   原生 <details>：不点也能被搜索引擎和 AI 抓到（内容始终在 DOM 里），
   点开只是视觉折叠。加号用两条矩形画出来，不拿字符当图标。
   ---------- */
.faq {
  --faq-bleed: clamp(12px, 2.2vw, 32px);
  border-top: 2px solid var(--fg);
  margin-inline: calc(-1 * var(--faq-bleed));
}
.faq-i { border-bottom: 1px solid var(--line); }
.faq-i[open] { background: rgba(255, 255, 255, .72); }

.faq-s {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr) 22px;
  align-items: start;
  gap: clamp(16px, 2.2vw, 34px);
  padding: 26px var(--faq-bleed);
  cursor: pointer;
  list-style: none;
}
.faq-s::-webkit-details-marker { display: none; }
.faq-s::marker { content: ""; }

.faq-n {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--fg-3);
  padding-top: 5px;
}
.faq-q {
  font-size: clamp(18px, 1.5vw, 21px);
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: -.015em;
  transition: color .25s var(--ease);
}
.faq-s:hover .faq-q { color: var(--cyan-ink); }

.faq-mk {
  position: relative;
  width: 14px;
  height: 14px;
  margin-top: 8px;
  justify-self: end;
}
.faq-mk::before,
.faq-mk::after {
  content: "";
  position: absolute;
  background: var(--fg);
  transition: transform .28s var(--ease), opacity .22s var(--ease);
}
.faq-mk::before { left: 0; top: 6.25px; width: 14px; height: 1.5px; }
.faq-mk::after { left: 6.25px; top: 0; width: 1.5px; height: 14px; }
.faq-i[open] .faq-mk::before { background: var(--cyan-ink); }
.faq-i[open] .faq-mk::after { transform: rotate(90deg); opacity: 0; }

.faq-a {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr) 22px;
  gap: clamp(16px, 2.2vw, 34px);
  padding: 0 var(--faq-bleed) 28px;
  animation: faqIn .3s var(--ease) backwards;
}
.faq-a > p {
  grid-column: 2;
  max-width: 68ch;
  font-size: 16.5px;
  line-height: 1.9;
  color: var(--fg-2);
}
.faq-wx {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 500;
  color: var(--fg);
}
@keyframes faqIn {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: none; }
}

/* ---------- 13. 联系 ---------- */
.sec-contact { background: transparent; }
.contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 440px);
  gap: clamp(40px, 6vw, 96px);
  align-items: start;
}
.contact-copy h2 {
  margin-top: 22px;
  font-size: var(--fs-h2);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -.035em;
}
.contact-copy .lead {
  margin-top: 20px;
  font-size: var(--fs-lead);
  line-height: 1.9;
  color: var(--fg-2);
}
.contact-copy .lead-2 { margin-top: 12px; }
.contact-list { margin-top: 34px; border-top: 1px solid var(--line-2); }
.contact-list li {
  display: grid;
  grid-template-columns: 100px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
  font-size: 15.5px;
}
.contact-list span {
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: .02em;
  color: var(--fg-3);
  padding-top: 4px;
}
.contact-list a { border-bottom: 1px solid var(--cyan-ink); }
.contact-list a:hover { color: var(--cyan-ink); }

/* 微信名片：页面上的第一联系方式 */
.wx-card {
  margin-top: 30px;
  padding: 20px clamp(18px, 2vw, 24px);
  border: 1px solid var(--fg);
  background: var(--bg-2);
}
.wx-cap {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .2em;
  color: var(--cyan-ink);
}
.wx-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 14px 20px;
  margin-top: 10px;
}
.wx-id {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.2vw, 27px);
  font-weight: 500;
  letter-spacing: .01em;
  line-height: 1.2;
  color: var(--fg);
  user-select: all;
}
.wx-hint {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.6;
  color: var(--fg-2);
}
.btn[data-copied] { background: var(--cyan); border-color: var(--cyan); color: #06171A; }

/* 表单抬头 */
.form-cap {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 6px 14px;
  margin-bottom: 20px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
  font-weight: 500;
  color: var(--fg);
}
.form-cap .en {
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 400;
  letter-spacing: .16em;
  color: var(--fg-3);
}
.opt {
  font-size: 11.5px;
  font-weight: 400;
  letter-spacing: .02em;
  color: var(--fg-3);
  border: 1px solid var(--line-2);
  padding: 0 5px;
}

.contact-form {
  padding: clamp(24px, 2.6vw, 32px);
  background: var(--bg-2);
  border: 1px solid var(--line-2);
}
.field { margin-bottom: 18px; }
.field label {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 8px;
  font-size: 13.5px;
  font-weight: 500;
  letter-spacing: .01em;
  color: var(--fg);
}
.field input, .field textarea {
  width: 100%;
  padding: 13px 14px;
  font-family: inherit;
  font-size: 15px;
  line-height: 1.6;
  color: var(--fg);
  background: var(--bg);
  border: 1px solid var(--line-2);
  border-radius: 0;
  transition: border-color .2s var(--ease);
  -webkit-appearance: none;
  appearance: none;
}
.field textarea { resize: vertical; min-height: 88px; }
.field input::placeholder, .field textarea::placeholder { color: #A2A7B2; }
.field input:focus, .field textarea:focus {
  outline: none;
  border-color: var(--fg);
  box-shadow: 0 0 0 3px rgba(0, 198, 217, .16);
}
.field.invalid input, .field.invalid textarea { border-color: #C0392B; }

.form-err {
  margin-bottom: 14px;
  padding: 10px 12px;
  font-size: 13.5px;
  color: #8E2B1F;
  background: #FDF1EF;
  border-left: 2px solid #C0392B;
}
.form-note { margin-top: 14px; font-size: 13px; line-height: 1.65; color: var(--fg-3); }
.form-note b { color: var(--fg); font-weight: 700; }

.form-result { margin-top: 22px; padding-top: 20px; border-top: 1px solid var(--line); }
.fr-cap {
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: .02em;
  color: var(--cyan-ink);
}
.form-result pre {
  margin: 12px 0 0;
  padding: 14px;
  max-height: 210px;
  overflow: auto;
  background: var(--bg);
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.75;
  white-space: pre-wrap;
  word-break: break-word;
}
.fr-actions { display: flex; gap: 10px; margin-top: 14px; }
.fr-actions .btn { min-height: 44px; padding: 0 16px; font-size: 13px; flex: 1; }

/* ---------- 14. 页脚 ---------- */
.foot {
  padding: clamp(48px, 5.5vw, 76px) 0 40px;
  border-top: 1px solid var(--fg);
  background: var(--bg);
}
.foot-in {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  gap: clamp(32px, 4vw, 64px);
  align-items: start;
}
.foot-name { margin-top: 16px; font-size: 19px; font-weight: 900; letter-spacing: .06em; }
.foot-name span {
  font-family: var(--font-mono);
  font-size: 9.5px;
  font-weight: 400;
  letter-spacing: .18em;
  color: var(--fg-3);
}
.foot-slogan { margin-top: 6px; font-size: 13px; color: var(--fg-2); }
.foot-nav { display: grid; gap: 2px; }
.foot-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  font-size: 13.5px;
  color: var(--fg-2);
  transition: color .2s var(--ease);
}
.foot-nav a:hover { color: var(--fg); }
.foot-legal { text-align: right; }
.foot-company { display: grid; gap: 8px; }
.foot-company dt {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--fg-3);
}
.foot-company dd { font-size: 14.5px; color: var(--fg); }
.foot-company dd b { font-family: var(--font-mono); font-weight: 500; letter-spacing: .02em; }
.foot-company a { border-bottom: 1px solid var(--line-2); }
.foot-copy { margin-top: 18px; font-size: 11.5px; color: var(--fg-3); }
/* 备案号：法规要求页脚明示且能点回工信部，字号与版权行同档，不抢眼 */
.foot-beian { margin-top: 5px; font-size: 11.5px; color: var(--fg-3); }
.foot-beian a { border-bottom: 1px solid var(--line-2); }
.foot-fonts { margin-top: 5px; font-size: 11px; color: var(--fg-3); }

/* ---------- 15. 入场 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .7s var(--ease) var(--d, 0s), transform .7s var(--ease) var(--d, 0s);
}
.reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .hero-h1 .line > span { transform: none; animation: none; }
  .sc-frame line { stroke-dashoffset: 0; animation: none; }
  .faq-a { animation: none; }
  .sc-in { opacity: 1; animation: none; }
  .sc-frame,
  .sc-corner,
  .sc-n,
  .sc-v { opacity: 1; animation: none; }
  .sc-corner line { stroke-dashoffset: 0; animation: none; }
  .sc-dot { opacity: 1; animation: none; }
  .sc-run { display: none; }
}

/* ---------- 16. 响应式 ---------- */
@media (max-width: 1120px) {
  .hero-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 360px); }
  .svc li { grid-template-columns: 64px minmax(0, 1fr) minmax(0, 300px); }
  .faq-s, .faq-a { grid-template-columns: 64px minmax(0, 1fr) 22px; }
  .foot-in { grid-template-columns: 1fr 1fr; }
  .foot-nav { grid-column: 1; grid-row: 2; display: flex; flex-wrap: wrap; gap: 6px 20px; }
  .foot-legal { grid-column: 2; grid-row: 1 / span 2; }
}

@media (max-width: 900px) {
  .nav, .topbar-cta { display: none; }
  .burger { display: block; }
  .tag .en { display: none; }

  .hero { padding-top: 112px; }
  .hero-grid { grid-template-columns: minmax(0, 1fr); gap: 40px; }
  .hero-art { max-width: 440px; }
  .hero-meta { margin-top: 40px; }

  .probs { grid-template-columns: 1fr; gap: 30px; }
  .svc li { grid-template-columns: 48px minmax(0, 1fr); }
  .faq-s, .faq-a { grid-template-columns: 48px minmax(0, 1fr) 20px; }
  .svc-out {
    grid-column: 2;
    margin-top: 12px;
    padding: 12px 0 0;
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .steps li:nth-child(3) { border-left: 0; padding-left: 0; }
  .steps li:nth-child(3) .step-dot { left: 0; }
  .steps li:nth-child(n+3) { margin-top: 22px; padding-top: 34px; border-top: 1px solid var(--line); }

  .fit { grid-template-columns: 1fr; gap: 30px; }
  .identity { grid-template-columns: 1fr; }
  .id-plate { max-width: 440px; }
  .company dl { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px; }
  .contact-grid { grid-template-columns: 1fr; }

  .foot-in { grid-template-columns: 1fr; gap: 30px; }
  .foot-nav { grid-column: 1; grid-row: auto; order: 2; }
  .foot-legal { grid-column: 1; grid-row: auto; text-align: left; order: 3; }
}

@media (max-width: 620px) {
  :root { --fs-body: 15px; }

  .hero { padding-top: 100px; }
  .hero-h1 { font-size: clamp(34px, 10.8vw, 46px); }
  .hero-art { max-width: 100%; }
  .hero-actions { gap: 14px; }
  .hero-actions .btn { width: 100%; }
  .link-arrow { min-height: 34px; }
  .hero-meta { grid-template-columns: 1fr 1fr; gap: 16px; }
  .hero-meta div:last-child { grid-column: 1 / -1; }
  .scheme-cap { flex-direction: column; align-items: flex-start; gap: 4px; }

  .statband { grid-template-columns: 1fr 1fr; }
  .statband li { padding: 18px 16px 0 0; }
  .statband li + li { padding-left: 0; border-left: 0; }
  .statband li:nth-child(even) { padding-left: 16px; border-left: 1px solid var(--line); }
  .statband li:nth-child(n+3) { margin-top: 20px; }
  .statband .num { font-size: 32px; }

  .sec-head { margin-bottom: 34px; }
  .svc li { grid-template-columns: 1fr; gap: 8px; padding: 26px var(--svc-bleed); }
  .svc-n { padding-top: 0; }
  .svc-out { grid-column: 1; padding-top: 10px; }
  .faq-s, .faq-a { grid-template-columns: 26px minmax(0, 1fr) 16px; gap: 12px; }
  .faq-s { padding: 22px var(--faq-bleed); }
  .faq-a { padding: 0 var(--faq-bleed) 24px; }
  .faq-mk { margin-top: 6px; }
  .faq-q { font-size: 17px; } /* 18px 时最长的那个问题会剩一个字单独成行 */
  .faq-a > p { font-size: 16px; }

  .steps { grid-template-columns: 1fr; }
  .steps li, .steps li + li {
    padding: 24px 0 0;
    margin-top: 0;
    border-left: 0;
    border-top: 1px solid var(--line);
  }
  .steps li:first-child { border-top: 0; padding-top: 30px; }
  .steps .step-dot, .steps li + li .step-dot { left: auto; right: 0; top: 30px; }

  .company dl { grid-template-columns: 1fr; }
  .sectors li { font-size: 12.5px; }

  .contact-list li { grid-template-columns: 1fr; gap: 5px; padding: 14px 0; }
  .contact-list span { padding-top: 0; }
  .wx-card { padding: 18px 16px; }
  .wx-row { gap: 12px; }
  .contact-form { padding: 20px; }
  .fr-actions { flex-direction: column; }
  .fr-actions .btn { width: 100%; }

  .foot-fonts { white-space: normal; }
}

/* ---------- 18. 背景光场与降级 ---------- */
@media (max-width: 760px) {
  #field { opacity: .8; }
  .hero::after { display: none; }   /* 窄屏上扫光会变成一道斜杠，去掉 */
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero::after { display: none; }
  .sc-frame line,
  .sc-corner line { animation: none; stroke-dashoffset: 0; }
  .sc-in,
  .sc-dot { animation: none; opacity: 1; }
  .sc-run { display: none; }
  .hero-art { transform: none; transition: none; }
}