/* 展如信息首页 · 工程图纸风（blueprint）
   叙事：整页是一张「企业数字底座施工图」，越往下画得越完整。
   动效只改 transform / opacity / stroke-dashoffset，统一用 --ease。 */

:root {
  --paper: #F7F5F0;
  --paper-2: #EFECE4;
  --sheet: #FFFEFB;
  --ink: #10263A;
  --ink-2: #3E5263;
  --ink-3: #66757F;
  --brand: #104E70;
  --brand-2: #2491EB;
  --accent: #D9622B;
  --accent-d: #B4471A;
  --ok: #1F6B54;
  --line: rgba(16, 38, 58, .14);
  --line-2: rgba(16, 38, 58, .32);
  --grid-minor: rgba(16, 38, 58, .045);
  --grid-major: rgba(16, 38, 58, .085);

  --sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", "Source Han Sans SC", system-ui, sans-serif;
  --mono: "SF Mono", "JetBrains Mono", "Cascadia Mono", Menlo, Consolas, "Roboto Mono", monospace;

  --r: 4px;
  --hd-h: 64px;
  --gutter: 32px;

  --dur-fast: 160ms;
  --dur: 320ms;
  --dur-slow: 640ms;
  --dur-draw: 1200ms;
  --stagger: 110ms;
  --ease: cubic-bezier(.2, .7, .1, 1);
}

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--hd-h) + 16px); -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 16px/1.75 var(--sans); -webkit-font-smoothing: antialiased; overflow-x: hidden; }
h1, h2, h3, h4, p, ol, ul, dl, dd, figure { margin: 0; padding: 0; }
ol, ul { list-style: none; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
svg { display: block; }
.mono { font-family: var(--mono); letter-spacing: .02em; }
.w { max-width: 1280px; margin: 0 auto; padding: 0 var(--gutter); }

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

.skip { position: absolute; left: 16px; top: -48px; z-index: 200; padding: 8px 14px; background: var(--ink); color: var(--paper); border-radius: var(--r); transition: transform var(--dur-fast) var(--ease); }
.skip:focus { transform: translateY(64px); }

/* ---------- meta strip ---------- */
.meta { border-bottom: 1px solid var(--line); font: 12px/1 var(--mono); color: var(--ink-3); }
.meta-in { display: flex; gap: 28px; height: 32px; align-items: center; }
.meta b { color: var(--ink); font-weight: 500; }
.meta-r { margin-left: auto; }

/* ---------- header ---------- */
.hd { position: sticky; top: 0; z-index: 50; background: var(--paper); border-bottom: 1px solid var(--line-2); }
.hd-in { display: flex; align-items: center; height: var(--hd-h); gap: 40px; }
.brand { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.brand svg { width: 28px; height: 28px; }
.brand-zh { font-size: 17px; font-weight: 600; letter-spacing: .04em; }
.brand-en { font: 11px var(--mono); letter-spacing: .14em; color: var(--ink-3); border-left: 1px solid var(--line-2); padding-left: 10px; }
.nav { display: flex; align-items: center; gap: 30px; font-size: 15px; color: var(--ink-2); }
.nav > a { position: relative; padding: 6px 0; transition: color var(--dur-fast) var(--ease); }
.nav > a::after { content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 1px; background: var(--ink); transform: scaleX(0); transform-origin: left; transition: transform var(--dur) var(--ease); }
.nav > a:hover, .nav > a.active { color: var(--ink); }
.nav > a:hover::after, .nav > a.active::after { transform: scaleX(1); }
.nav-mobile { display: none; }
.hd-r { margin-left: auto; display: flex; align-items: center; gap: 16px; }
.lang { display: flex; font: 12px var(--mono); border: 1px solid var(--line-2); border-radius: var(--r); overflow: hidden; }
.lang-btn { padding: 5px 9px; color: var(--ink-3); transition: background var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease); }
.lang-btn.active { background: var(--ink); color: var(--paper); }
.menu-toggle { display: none; width: 40px; height: 40px; position: relative; }
.hamburger, .hamburger::before, .hamburger::after { position: absolute; left: 10px; width: 20px; height: 1.5px; background: var(--ink); transition: transform var(--dur) var(--ease), opacity var(--dur-fast) var(--ease); }
.hamburger { top: 19px; }
.hamburger::before, .hamburger::after { content: ""; left: 0; }
.hamburger::before { transform: translateY(-6px); }
.hamburger::after { transform: translateY(6px); }
.menu-toggle.active .hamburger { background: transparent; }
.menu-toggle.active .hamburger::before { transform: rotate(45deg); background: var(--ink); }
.menu-toggle.active .hamburger::after { transform: rotate(-45deg); background: var(--ink); }

/* 窄屏顶部进度线（图层计的简化版） */
.progress { position: absolute; left: 0; right: 0; bottom: -1px; height: 2px; pointer-events: none; }
.progress i { display: block; height: 100%; background: var(--accent); transform: scaleX(0); transform-origin: left; will-change: transform; }

/* ---------- buttons ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 10px; min-height: 44px; padding: 0 20px; border: 1px solid var(--ink); border-radius: var(--r); font-size: 15px; font-weight: 500; line-height: 1.2; white-space: nowrap; transition: background var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease); }
.btn:active { transform: translateY(1px); }
.btn .ar { font-family: var(--mono); transition: transform var(--dur) var(--ease); }
.btn:hover .ar { transform: translateX(3px); }
.btn-sm { min-height: 36px; padding: 0 14px; font-size: 14px; }
.btn-ink { background: var(--ink); color: var(--paper); }
.btn-ink:hover { background: var(--brand); border-color: var(--brand); }
.btn-ac { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-ac:hover { background: var(--accent-d); border-color: var(--accent-d); }
.btn-o { background: transparent; }
.btn-o:hover { background: var(--ink); color: var(--paper); }
.link { display: inline-flex; gap: 2px; font-weight: 500; color: var(--brand); border-bottom: 1px solid currentColor; padding-bottom: 1px; }
.link:hover { color: var(--accent-d); }

/* ---------- shared drawing bits ---------- */
.frame { position: relative; border: 1px solid var(--line-2); background: var(--paper); }
.tag { display: flex; align-items: center; gap: 12px; font: 12px/1.4 var(--mono); color: var(--ink-3); }
.tag em { font-style: normal; color: var(--accent); }
.tag i { width: 24px; height: 1px; background: var(--ink-3); flex-shrink: 0; }
.u { background: linear-gradient(transparent 70%, rgba(217, 98, 43, .2) 70%); }
.tb { display: grid; grid-template-columns: repeat(auto-fit, minmax(0, 1fr)); border-top: 1px solid var(--line-2); font: 11px/1.5 var(--mono); background: var(--paper); }
.tb > div { padding: 10px 14px; border-right: 1px solid var(--line); min-width: 0; }
.tb > div:last-child { border-right: 0; }
.tb span { display: block; color: var(--ink-3); }
.tb b { font: 500 13px/1.5 var(--sans); color: var(--ink); }
.tb b.mono { font-family: var(--mono); }

/* ---------- 01 hero ---------- */
.hero { padding: 40px 0 0; }
.hero-frame {
  display: grid; grid-template-columns: 7fr 5fr; overflow: hidden;
  background:
    linear-gradient(var(--grid-major) 1px, transparent 1px) 0 0 / 100px 100px,
    linear-gradient(90deg, var(--grid-major) 1px, transparent 1px) 0 0 / 100px 100px,
    linear-gradient(var(--grid-minor) 1px, transparent 1px) 0 0 / 20px 20px,
    linear-gradient(90deg, var(--grid-minor) 1px, transparent 1px) 0 0 / 20px 20px,
    var(--paper);
}
.hero-cv { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; z-index: 0; }
.hero-l { position: relative; z-index: 1; padding: 56px 56px 48px; border-right: 1px solid var(--line-2); }
.hero-l .tag { margin-bottom: 32px; }
h1 { font-size: 54px; line-height: 1.22; font-weight: 600; letter-spacing: -.01em; }
.h1-line { display: block; }
h1 .u { display: inline-block; }
.lead { margin-top: 26px; font-size: 18px; color: var(--ink-2); max-width: 34em; text-wrap: pretty; }
.hero-l .lead { text-wrap: balance; }
.cta { display: flex; gap: 12px; margin-top: 36px; flex-wrap: wrap; }
.specs { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 56px; border-top: 1px solid var(--line-2); }
.spec { padding: 18px 18px 4px 0; min-width: 0; }
.spec + .spec { padding-left: 18px; border-left: 1px solid var(--line); }
.spec dt { font: 12px var(--mono); color: var(--ink-3); }
.spec .v { font: 600 26px/1.3 var(--mono); margin-top: 6px; }
.spec .v-zh { font-family: var(--sans); }
.spec .v small { font: 14px var(--sans); color: var(--ink-2); margin-left: 4px; }
.spec .d { font-size: 13px; color: var(--ink-3); }

.hero-r { position: relative; z-index: 1; display: flex; flex-direction: column; background: rgba(247, 245, 240, .72); }
.toc { flex: 1; padding: 48px 36px 32px; }
.toc-h { display: flex; justify-content: space-between; font-size: 13px; color: var(--ink-3); padding-bottom: 12px; border-bottom: 1px solid var(--ink); }
.toc a { display: grid; grid-template-columns: 34px auto 1fr auto; gap: 12px; align-items: baseline; padding: 15px 0; border-bottom: 1px solid var(--line); font-size: 15px; transition: color var(--dur-fast) var(--ease); }
.toc a b { font: 500 12px var(--mono); color: var(--ink-3); }
.toc a i { border-bottom: 1px dotted var(--line-2); transform: translateY(-4px); }
.toc a em { font: normal 11px var(--mono); color: var(--ink-3); }
.toc a span { transition: transform var(--dur) var(--ease); }
.toc a:hover { color: var(--brand); }
.toc a:hover span { transform: translateX(4px); }

/* 首屏按时间编排进场：总时长 ≈ 5 × 110ms + 640ms ≈ 1.19s */
.hero-in { animation: rise var(--dur-slow) var(--ease) both; animation-delay: calc(var(--d, 0) * var(--stagger)); }
@keyframes rise { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }

/* ---------- 图层计 ---------- */
.gauge { display: none; }
@media (min-width: 1400px) {
  .gauge { display: block; position: fixed; z-index: 40; top: 50%; right: max(12px, calc((100vw - 1280px) / 2 - 76px)); width: 60px; transform: translateY(-50%); font: 11px/1.3 var(--mono); color: var(--ink-3); pointer-events: none; }
  .gauge-read { padding-bottom: 10px; margin-bottom: 14px; border-bottom: 1px solid var(--line-2); }
  .gauge-read span { display: block; }
  .gauge-read b { font: 600 18px var(--mono); color: var(--ink); }
  .gauge-scale { position: relative; height: 300px; border-left: 1px solid var(--line-2); }
  .gauge-scale ol { height: 100%; display: flex; flex-direction: column; justify-content: space-between; }
  .gauge-scale li { position: relative; padding-left: 10px; transition: color var(--dur) var(--ease); }
  .gauge-scale li::before { content: ""; position: absolute; left: 0; top: .65em; width: 6px; height: 1px; background: var(--line-2); }
  .gauge-scale li span { display: block; font-family: var(--sans); font-size: 11px; }
  .gauge-scale li.on { color: var(--accent); }
  .gauge-mark { position: absolute; left: -5px; top: 0; width: 9px; height: 9px; border: 1.5px solid var(--accent); background: var(--paper); transform: translateY(0) rotate(45deg); will-change: transform; }
  .progress { display: none; }
}

/* ---------- sections ---------- */
.sec { padding: 120px 0; }
.sec-h { display: grid; grid-template-columns: 200px 1fr; gap: 32px; border-top: 1px solid var(--line-2); padding-top: 22px; }
.sec-h .no { font: 13px var(--mono); color: var(--ink-3); }
.sec-h .no b { color: var(--accent); font-weight: 500; }
.sec-h .no span { font-family: var(--sans); }
h2 { font-size: 36px; line-height: 1.3; font-weight: 600; text-wrap: balance; }
.sec-h p { margin-top: 14px; color: var(--ink-2); max-width: 36em; }

/* ---------- 02 数字底座（核心叙事） ---------- */
.fd { display: grid; grid-template-columns: 7fr 5fr; gap: 56px; margin-top: 56px; }
.fd-draw {
  position: sticky; top: calc(var(--hd-h) + 24px); align-self: start;
  border: 1px solid var(--line-2);
  background:
    linear-gradient(var(--grid-minor) 1px, transparent 1px) 0 0 / 20px 20px,
    linear-gradient(90deg, var(--grid-minor) 1px, transparent 1px) 0 0 / 20px 20px,
    var(--sheet);
}
.fd-draw .iso { padding: 16px 12px 4px; max-height: calc(100vh - var(--hd-h) - 120px); margin: 0 auto; }
.iso { width: 100%; height: auto; display: block; overflow: visible; }
.iso .dim path { stroke: var(--ink-3); stroke-width: .8; fill: none; }
.iso .dim text { font: 10px var(--mono); fill: var(--ink-3); letter-spacing: .12em; }
/* 底板：纸白顶面 + 浅灰蓝侧面 */
.iso .pl-t { fill: url(#plGrad); stroke: rgba(16, 38, 58, .45); stroke-width: 1; }
.iso .pl-r { fill: #D3DEE7; stroke: rgba(16, 38, 58, .35); stroke-width: .8; }
.iso .pl-l { fill: #BFCFDC; stroke: rgba(16, 38, 58, .35); stroke-width: .8; }
.iso .grid { stroke: rgba(16, 78, 112, .10); stroke-width: .6; fill: none; }
.iso .edge { stroke: var(--brand); stroke-width: 1.4; fill: none; transition: stroke var(--dur) var(--ease); }
/* 设备：三面明暗 + 墨蓝细描边 */
.iso .bx { stroke: rgba(16, 38, 58, .72); stroke-width: .8; stroke-linejoin: round; }
.iso .f-t { fill: #FFFFFF; }
.iso .f-r { fill: #DCE7F0; }
.iso .f-l { fill: #B9CCDB; }
.iso .legacy.f-t { fill: #E4E1DA; } .iso .legacy.f-r { fill: #CFCAC0; } .iso .legacy.f-l { fill: #B5AFA3; }
.iso .ring { stroke: rgba(16, 38, 58, .4); stroke-width: .7; fill: none; }
.iso .slot { stroke: rgba(16, 78, 112, .55); stroke-width: 1; fill: none; stroke-linecap: round; }
.iso .led { fill: var(--brand-2); }
.iso .hub { fill: none; stroke: var(--accent); stroke-width: 1.6; }
.iso .win { fill: rgba(36, 145, 235, .14); stroke: rgba(16, 38, 58, .6); stroke-width: .8; }
.iso .arm { stroke: var(--ink-2); stroke-width: 4; fill: none; stroke-linecap: round; stroke-linejoin: round; }
.iso .joint { fill: var(--sheet); stroke: var(--accent); stroke-width: 1.4; }
.iso .sig { stroke: var(--brand-2); stroke-width: 1; fill: none; opacity: .7; }
.iso .panel { fill: rgba(255, 255, 255, .78); stroke: rgba(16, 38, 58, .6); stroke-width: .9; }
.iso .bar { stroke: var(--brand-2); stroke-width: 3.5; fill: none; }
.iso .chart { stroke: var(--accent); stroke-width: 1.5; fill: none; stroke-linejoin: round; }
.iso .flow { stroke: var(--brand-2); stroke-width: 1.2; fill: none; stroke-dasharray: 3 7; }
.iso .bus { stroke: rgba(16, 78, 112, .4); stroke-width: 1; stroke-dasharray: 2 6; fill: none; }
.iso .ghost { stroke: rgba(16, 38, 58, .3); stroke-dasharray: 3 5; fill: none; }
.iso .ldr { stroke: rgba(16, 38, 58, .55); stroke-width: .8; fill: none; }
.iso .lb { font: 600 12px var(--mono); fill: var(--ink); transition: fill var(--dur) var(--ease); }
.iso .lb-n { font: 12px var(--sans); fill: var(--ink-2); }
.iso .ly.cur .edge { stroke: var(--accent); }
.iso .ly.cur .lb { fill: var(--accent); }
.iso .ghost-g { transition: opacity var(--dur) var(--ease); }
.iso .ghost-g.on { opacity: 0; }
/* 层内元素：底板先落位，设备依次落下 */
.iso .obj { transition: opacity var(--dur-slow) var(--ease) calc(var(--i, 0) * 90ms), transform var(--dur-slow) var(--ease) calc(var(--i, 0) * 90ms); }
.iso .lbl { transition: opacity var(--dur) var(--ease) 360ms; }
.js .fd-draw .ly:not(.on) .obj { opacity: 0; transform: translateY(-18px); transition-delay: 0s; transition-duration: var(--dur); }
.js .fd-draw .ly:not(.on) .lbl { opacity: 0; transition-delay: 0s; }
/* 数据流动 / 指示灯 / 信号：只在该层画出后运行 */
.iso .ly.on .flow { animation: iso-flow 1.4s linear infinite; }
.iso .ly.on .bus { animation: iso-flow 2.2s linear infinite; }
.iso .ly.on .blink { animation: iso-blink 2.8s steps(1) infinite; animation-delay: calc(var(--k, 0) * -.7s); }
.iso .ly.on .sig { animation: iso-sig 2.4s var(--ease) infinite; animation-delay: calc(var(--k, 0) * .3s); }
@keyframes iso-flow { to { stroke-dashoffset: -20; } }
@keyframes iso-blink { 0%, 70% { opacity: 1; } 71%, 100% { opacity: .25; } }
@keyframes iso-sig { 0%, 100% { opacity: .15; } 40% { opacity: .9; } }

.fd-steps { display: flex; flex-direction: column; }
.step { min-height: 72vh; display: flex; flex-direction: column; justify-content: center; padding: 40px 0; border-bottom: 1px dashed var(--line-2); transition: opacity var(--dur) var(--ease); }
.step:last-child { border-bottom: 0; }
.js .step:not(.on) { opacity: .32; }
.step-id { display: flex; justify-content: space-between; font: 12px var(--mono); color: var(--ink-3); padding-bottom: 10px; border-bottom: 1px solid var(--line); }
.step-id span + span { font-family: var(--sans); }
.step h3 { font-size: 26px; font-weight: 600; margin: 22px 0 10px; }
.step > p { color: var(--ink-2); }
.caps { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
.caps li { font-size: 13px; padding: 3px 10px; border: 1px solid var(--line-2); border-radius: var(--r); color: var(--ink-2); background: var(--sheet); }
.step .first { margin-top: 22px; padding-top: 16px; border-top: 1px dashed var(--line-2); display: grid; gap: 2px; }
.step .first span { font: 12px var(--mono); color: var(--accent); }
.step .first b { font-weight: 500; }

/* ---------- 03 常见断点 ---------- */
.sec-line { border-top: 1px solid var(--line); }
.acc { margin-top: 56px; border-top: 1px solid var(--ink); }
.acc-item { border-bottom: 1px solid var(--line-2); }
.acc-btn { width: 100%; display: grid; grid-template-columns: 1fr auto 32px; gap: 16px; align-items: center; padding: 22px 0; text-align: left; transition: color var(--dur-fast) var(--ease); }
.acc-t { font-size: 18px; font-weight: 600; }
.acc-tag { font-size: 12px; color: var(--ink-3); }
.acc-btn:hover .acc-t { color: var(--brand); }
.acc-ic { position: relative; width: 28px; height: 28px; border: 1px solid var(--line-2); border-radius: var(--r); transition: transform var(--dur) var(--ease), background var(--dur-fast) var(--ease); }
.acc-ic::before, .acc-ic::after { content: ""; position: absolute; left: 8px; right: 8px; top: 13px; height: 1.5px; background: var(--ink); }
.acc-ic::after { transform: rotate(90deg); }
.is-open .acc-ic { transform: rotate(45deg); background: var(--sheet); }
/* 用户主动展开，用 grid 行高过渡；JS 不可用时全部展开 */
.acc-panel { display: grid; grid-template-rows: 1fr; transition: grid-template-rows var(--dur) var(--ease); }
.acc-panel > div { overflow: hidden; }
.js .acc-item:not(.is-open) .acc-panel { grid-template-rows: 0fr; }
.js .acc-item:not(.is-open) .acc-panel > div { visibility: hidden; transition: visibility 0s linear var(--dur); }
.acc-body { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 12px 32px; padding: 0 48px 24px 0; transition: opacity var(--dur) var(--ease); }
.js .acc-item:not(.is-open) .acc-body { opacity: 0; }
.acc-body p { display: flex; gap: 12px; align-items: baseline; }
.acc-body .k { font: 12px var(--mono); color: var(--accent); white-space: nowrap; }

/* ---------- 04 运行保障 ---------- */
.op { background: var(--paper-2); }
.op-grid { display: grid; grid-template-columns: 5fr 7fr; gap: 64px; margin-top: 56px; align-items: start; }
.op-k { font: 12px var(--mono); color: var(--ink-3); padding-bottom: 10px; border-bottom: 1px solid var(--ink); }
.duty li { display: flex; align-items: center; gap: 14px; padding: 13px 0; border-bottom: 1px solid var(--line); font-size: 16px; }
.duty svg { width: 20px; height: 20px; flex-shrink: 0; }
.duty rect { fill: var(--sheet); stroke: var(--ink-2); stroke-width: 1.2; }
.duty path { fill: none; stroke: var(--accent); stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; stroke-dasharray: 1; stroke-dashoffset: 0; transition: stroke-dashoffset var(--dur-slow) var(--ease) calc(var(--i) * var(--stagger) + 200ms); }
.js .duty:not(.in) path { stroke-dashoffset: 1; }
.price { display: flex; margin-top: 32px; }

.report { position: relative; background: var(--sheet); border: 1px solid var(--line-2); padding: 28px 32px 22px; box-shadow: 8px 8px 0 -1px var(--paper), 8px 8px 0 0 var(--line-2); }
.rp-h { display: flex; justify-content: space-between; align-items: baseline; padding-bottom: 14px; border-bottom: 2px solid var(--ink); }
.rp-h b { font-size: 18px; font-weight: 600; }
.rp-h span { font-size: 12px; color: var(--ink-3); }
.rp-meta { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; padding: 14px 0; border-bottom: 1px solid var(--line); font-size: 13px; }
.rp-meta dt { color: var(--ink-3); font-size: 12px; }
.rp-rows li { display: grid; grid-template-columns: auto 1fr auto; gap: 12px; align-items: baseline; padding: 13px 0; border-bottom: 1px solid var(--line); font-size: 15px; transition: opacity var(--dur) var(--ease) calc(var(--i) * var(--stagger) + 160ms), transform var(--dur) var(--ease) calc(var(--i) * var(--stagger) + 160ms); }
.rp-rows i { border-bottom: 1px dotted var(--line-2); transform: translateY(-4px); }
.rp-rows b { font-size: 13px; font-weight: 600; }
.rp-rows .ok { color: var(--ok); }
.rp-rows .warn { color: var(--accent-d); }
.js .report:not(.in) .rp-rows li { opacity: 0; transform: translateY(6px); }
.rp-f { display: flex; justify-content: space-between; margin-top: 16px; font-size: 13px; color: var(--ink-2); }
.sig { color: var(--ok); }
.rp-note { margin-top: 10px; font-size: 12px; color: var(--ink-3); }

/* ---------- 数据 ---------- */
.stats { border-top: 1px solid var(--line-2); border-bottom: 1px solid var(--line-2); }
.stat-row { display: grid; grid-template-columns: repeat(4, 1fr); }
.stat { display: flex; flex-direction: column-reverse; justify-content: flex-end; gap: 6px; padding: 36px 24px; border-right: 1px solid var(--line); }
.stat:first-child { padding-left: 0; }
.stat:last-child { border-right: 0; }
.stat dt { font-size: 13px; color: var(--ink-3); }
.stat dd { font: 600 44px/1.1 var(--mono); font-variant-numeric: tabular-nums; }
.stat dd small { font: 15px var(--sans); color: var(--ink-2); margin-left: 6px; }

/* ---------- 05 建设方法 ---------- */
.flow { position: relative; display: grid; grid-template-columns: repeat(5, 1fr); gap: 24px; margin-top: 64px; }
.flow::before { content: ""; position: absolute; left: 0; right: 0; top: 17px; height: 1px; background: var(--ink); transform-origin: left; transition: transform var(--dur-draw) var(--ease); }
.js .flow:not(.in)::before { transform: scaleX(0); }
.flow li { position: relative; transition: opacity var(--dur) var(--ease) calc(var(--i) * var(--stagger) + 200ms), transform var(--dur) var(--ease) calc(var(--i) * var(--stagger) + 200ms); }
.js .flow:not(.in) li { opacity: 0; transform: translateY(8px); }
.fl-n { display: inline-flex; align-items: center; justify-content: center; width: 36px; height: 36px; border: 1px solid var(--ink); border-radius: 50%; background: var(--paper); font: 500 12px var(--mono); }
.flow li:last-child .fl-n { border-color: var(--accent); color: var(--accent); }
.flow h3 { font-size: 18px; font-weight: 600; margin: 18px 0 6px; }
.flow p { font-size: 14px; color: var(--ink-2); }

/* ---------- 06 常见问题 ---------- */
.faq { display: grid; grid-template-columns: 1fr 1fr; gap: 0 56px; margin-top: 48px; }
.faq-item { padding: 24px 0 26px; border-top: 1px solid var(--line-2); }
.faq-item h3 { font-size: 17px; font-weight: 600; }
.faq-item p { margin-top: 8px; font-size: 15px; color: var(--ink-2); }

/* ---------- 07 联系 ---------- */
.cta-sec { padding-top: 40px; }
.cta-frame { display: grid; grid-template-columns: 7fr 5fr; }
.cta-l { padding: 56px; border-right: 1px solid var(--line-2); }
.cta-l h2 { margin-top: 18px; font-size: 36px; line-height: 1.36; }
.cta-l h2 span { display: block; }
.cta-l h2 .u { display: inline; }
.cta-r { position: relative; display: flex; flex-direction: column; justify-content: space-between; background: var(--sheet); }
.qr { display: flex; flex-direction: column; align-items: center; gap: 12px; padding: 96px 24px 36px; }
.qr img { width: 180px; height: 180px; padding: 10px; background: #fff; border: 1px solid var(--line-2); }
.qr p { font-size: 14px; color: var(--ink-2); }
.contact { margin-top: 32px; border-top: 1px solid var(--ink); }
.ct-row { display: grid; grid-template-columns: 64px 1fr; gap: 16px; align-items: baseline; padding: 14px 0; border-bottom: 1px solid var(--line); }
.ct-row dt { font: 12px var(--mono); color: var(--ink-3); }
.ct-row a { color: var(--ink); border-bottom: 1px solid transparent; transition: border-color var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease); }
.ct-row a:hover { color: var(--brand); border-bottom-color: currentColor; }
.ct-phone a { font-size: 28px; font-weight: 600; color: var(--accent); }
.stamp { position: absolute; right: 22px; top: 22px; display: flex; flex-direction: column; align-items: center; padding: 8px 14px; border: 2px solid var(--accent); color: var(--accent); background: rgba(255, 254, 251, .9); transform: rotate(-8deg); transition: opacity var(--dur) var(--ease) 240ms, transform var(--dur-slow) var(--ease) 240ms; }
.stamp b { font-size: 20px; letter-spacing: .12em; }
.stamp span { font-size: 9px; letter-spacing: .14em; }
.js .cta-r:not(.in) .stamp { opacity: 0; transform: rotate(-8deg) scale(1.25); }

/* ---------- footer ---------- */
.ft { margin-top: 40px; border-top: 1px solid var(--ink); padding: 48px 0 28px; font-size: 14px; color: var(--ink-2); }
.ft-top { display: flex; justify-content: space-between; gap: 48px; flex-wrap: wrap; }
.ft-brand p { margin-top: 12px; color: var(--ink-3); }
.ft-cols { display: grid; grid-template-columns: repeat(3, auto); gap: 64px; }
.ft-col { display: flex; flex-direction: column; gap: 8px; align-items: flex-start; }
.ft-col h4 { font: 500 12px var(--mono); color: var(--ink-3); margin-bottom: 4px; }
.ft-col a:hover, .ft-col button:hover { color: var(--brand); }
.ft-bottom { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px 24px; margin-top: 40px; padding-top: 18px; border-top: 1px solid var(--line); font-size: 12px; color: var(--ink-3); }
.ft-bottom div { display: flex; gap: 18px; flex-wrap: wrap; }

@keyframes fade-in { from { opacity: 0; } to { opacity: 1; } }

/* ---------- responsive ---------- */
@media (max-width: 1100px) {
  .hero-l { padding: 48px 40px 40px; }
  h1 { font-size: 46px; }
  .toc { padding: 40px 28px 28px; }
}

@media (max-width: 1024px) {
  .nav { display: none; }
  .nav.active { display: flex; position: absolute; top: 100%; left: 0; right: 0; flex-direction: column; align-items: stretch; gap: 0; padding: 8px var(--gutter) 20px; background: var(--paper); border-bottom: 1px solid var(--line-2); max-height: calc(100vh - 100px); overflow: auto; animation: fade-in var(--dur) var(--ease) both; }
  .nav.active > a { padding: 14px 0; border-bottom: 1px solid var(--line); font-size: 16px; }
  .nav.active > a::after { display: none; }
  .nav.active .nav-mobile { display: flex; flex-direction: column; gap: 14px; padding-top: 18px; }
  .nav-mobile .lang { align-self: flex-start; }
  .nav-mobile .lang-btn { padding: 8px 14px; }
  .menu-toggle { display: block; }
  .hd-r .lang { display: none; }
  .hero-frame, .cta-frame { grid-template-columns: 1fr; }
  .hero-l, .cta-l { border-right: 0; border-bottom: 1px solid var(--line-2); }
  .hero-r { background: rgba(247, 245, 240, .85); }
  .op-grid { grid-template-columns: 1fr; gap: 48px; }
  .stat-row { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(2) { border-right: 0; }
  .stat:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .stat:nth-child(3) { padding-left: 0; }
  .flow { grid-template-columns: 1fr; gap: 28px; padding-left: 56px; }
  .flow::before { left: 17px; right: auto; top: 0; bottom: 0; width: 1px; height: auto; transform-origin: top; }
  .js .flow:not(.in)::before { transform: scaleY(0); }
  .fl-n { position: absolute; left: -56px; top: 0; }
  .flow h3 { margin-top: 4px; }
}

@media (max-width: 900px) {
  .fd { display: block; margin-top: 40px; }
  .fd-draw { position: static; margin: 0 calc(var(--gutter) * -1); border-left: 0; border-right: 0; }
  .fd-draw .iso { max-height: none; padding: 12px 8px 0; }
  .iso .lb { font-size: 18px; }
  .iso .lb-n { font-size: 17px; }
  .step { min-height: 0; padding: 32px 0; }
  .js .step:not(.on) { opacity: 1; }
  .sec-h { grid-template-columns: 1fr; gap: 10px; }
}

@media (max-width: 640px) {
  :root { --gutter: 16px; --hd-h: 56px; }
  .meta-wide, .brand-en { display: none; }
  .hd-r .btn-sm { display: none; }
  .hero { padding-top: 20px; }
  .hero-l { padding: 32px 20px 28px; }
  h1 { font-size: 26px; }
  .lead { font-size: 16px; margin-top: 20px; }
  .cta { flex-direction: column; margin-top: 28px; }
  .specs { margin-top: 32px; }
  .spec { padding: 14px 10px 4px 0; }
  .spec + .spec { padding-left: 10px; }
  .spec .v { font-size: 19px; }
  .spec .v small { display: block; margin: 0; font-size: 12px; }
  .spec .d { font-size: 12px; line-height: 1.5; }
  .toc { padding: 28px 20px 20px; }
  .toc a { grid-template-columns: 30px 1fr auto; }
  .toc a i { display: none; }
  .sec { padding: 72px 0; }
  h2 { font-size: 26px; }
  .step h3 { font-size: 22px; }
  .acc { margin-top: 36px; }
  .faq { grid-template-columns: 1fr; margin-top: 32px; }
  .faq-item { padding: 20px 0 22px; }
  .acc-btn { grid-template-columns: 1fr 28px; gap: 6px 12px; padding: 18px 0; }
  .acc-t { font-size: 16px; }
  .acc-tag { grid-column: 1; grid-row: 2; }
  .acc-ic { grid-column: 2; grid-row: 1; }
  .acc-body { padding: 0 0 20px; flex-direction: column; }
  .acc-body p { flex-direction: column; gap: 2px; }
  .op-grid { margin-top: 36px; }
  .report { padding: 22px 18px 18px; box-shadow: 6px 6px 0 -1px var(--paper), 6px 6px 0 0 var(--line-2); }
  .rp-rows li { font-size: 14px; }
  .stat { padding: 24px 12px; }
  .stat dd { font-size: 32px; }
  .stat dd small { display: block; margin: 4px 0 0; font-size: 13px; }
  .cta-l { padding: 32px 20px; }
  .cta-l h2 { font-size: 25px; word-break: keep-all; text-wrap: wrap; }
  .ct-phone a { font-size: 24px; }
  .qr { padding: 92px 16px 28px; }
  .stamp { top: 18px; }
  .stamp b { font-size: 17px; }
  .stamp { right: 16px; }
  .ft-cols { grid-template-columns: 1fr 1fr; gap: 32px; }
}

@media (max-width: 360px) {
  h1 { font-size: 23px; }
}

/* ---------- 减少动态效果：关掉位移和描边，只保留淡入 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero-in { animation-name: fade-in; }
  .duty path { transition: none; }
  .js .fd-draw .ly:not(.on) .obj { transform: none; }
  .iso .flow, .iso .bus, .iso .blink, .iso .sig { animation: none !important; }
  .js .duty:not(.in) path { stroke-dashoffset: 0; }
  .js .report:not(.in) .rp-rows li, .js .flow:not(.in) li { transform: none; }
  .js .flow:not(.in)::before { transform: none; }
  .js .cta-r:not(.in) .stamp { transform: rotate(-8deg); }
  .btn:hover .ar, .toc a:hover span { transform: none; }
}