/* ============================================================
   深圳万亿品牌管理有限公司 · 企业AI落地官网
   Design tokens → 组件 → 区块 → 响应式
   ============================================================ */

:root {
  /* 品牌主色：深 → 中 → 浅 */
  --navy:    #1F3864;
  --navy-2:  #2E5B9E;
  --blue:    #4874CB;
  /* 点缀 */
  --cyan:    #3E9BD6;
  --gold:    #B8944D;
  /* 中性 */
  --ink:     #1A1F2B;
  --gray:    #5A6474;
  --gray-2:  #8A93A3;
  --line:    #E3E8F0;
  --bg-soft: #F7F9FC;
  --white:   #FFFFFF;
  /* 深色呼吸区 */
  --dark:    #15274A;
  --dark-2:  #0E1B36;

  --radius:    14px;
  --radius-sm: 10px;
  --shadow:    0 1px 2px rgba(21,39,74,.06), 0 8px 24px rgba(21,39,74,.06);
  --shadow-lg: 0 12px 40px rgba(21,39,74,.14);
  --maxw:      1180px;
  /* AI 抽象化视觉 */
  --glow:      #7FD3F5;
  --grid-a:    rgba(127,211,245,.045);
  --grid-b:    rgba(127,211,245,.035);
  --grid-size: 52px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.sec { padding: 84px 0; }
.sec-soft { background: var(--bg-soft); }
.sec-dark {
  background-color: var(--dark); color: #E8EEF8;
  background-image:
    linear-gradient(var(--grid-a) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-a) 1px, transparent 1px),
    radial-gradient(900px 420px at 88% 0%, rgba(62,155,214,.22), transparent 66%),
    radial-gradient(760px 380px at 6% 100%, rgba(72,116,203,.18), transparent 70%);
  background-size: var(--grid-size) var(--grid-size), var(--grid-size) var(--grid-size), auto, auto;
}
.sec-dark-2 {
  background-color: var(--dark-2); color: #E8EEF8;
  background-image:
    linear-gradient(var(--grid-b) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-b) 1px, transparent 1px);
  background-size: var(--grid-size) var(--grid-size);
}

/* ---------- 排版层级 ---------- */
.kicker {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: 13.5px; font-weight: 600; letter-spacing: .06em;
  color: var(--blue); text-transform: none; margin-bottom: 14px;
}
.kicker b {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 26px; height: 22px; padding: 0 6px;
  background: var(--blue); color: #fff;
  border-radius: 5px; font-size: 12.5px; font-weight: 700; letter-spacing: 0;
}
.sec-dark .kicker, .sec-dark-2 .kicker { color: #7FB2F0; }
.sec-dark .kicker b, .sec-dark-2 .kicker b { background: var(--cyan); color: #06182E; }

h1, h2, h3, h4 { margin: 0; font-weight: 700; letter-spacing: -.01em; }
h1 { font-size: 46px; line-height: 1.18; }
h2 { font-size: 32px; line-height: 1.3; color: var(--navy); }
h3 { font-size: 19px; line-height: 1.45; color: var(--navy); }
.sec-dark h2, .sec-dark-2 h2 { color: #fff; }
.sec-dark h3, .sec-dark-2 h3 { color: #fff; }
.lede { font-size: 16.5px; color: var(--gray); margin: 14px 0 0; max-width: 760px; }
.sec-dark .lede, .sec-dark-2 .lede { color: #A9BBD6; }
.sec-head { margin-bottom: 44px; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 48px; padding: 0 26px;
  border-radius: 999px; border: 1.5px solid transparent;
  font-size: 15.5px; font-weight: 600; cursor: pointer;
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease;
  font-family: inherit;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: var(--blue); color: #fff; box-shadow: 0 6px 18px rgba(72,116,203,.32); }
.btn-primary:hover { background: #3A64BC; }
.btn-ghost { background: transparent; color: var(--navy); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--blue); color: var(--blue); }
.sec-dark .btn-ghost, .sec-dark-2 .btn-ghost { color: #DCE6F7; border-color: rgba(255,255,255,.28); }
.sec-dark .btn-ghost:hover, .sec-dark-2 .btn-ghost:hover { border-color: #fff; color: #fff; }
.hero .btn-ghost { color: #DCE6F7; border-color: rgba(255,255,255,.34); background: rgba(255,255,255,.07); }
.hero .btn-ghost:hover { color: #fff; border-color: #fff; background: rgba(255,255,255,.14); }
.btn-gold { background: var(--gold); color: #fff; box-shadow: 0 6px 18px rgba(184,148,77,.3); }
.btn-gold:hover { background: #A6833F; }
.btn-sm { min-height: 44px; padding: 0 20px; font-size: 15px; }

/* ---------- 顶部导航 ---------- */
.nav {
  position: sticky; top: 0; z-index: 60;
  background: rgba(14,27,54,.92);
  -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,.08);
}
.nav-in { display: flex; align-items: center; justify-content: space-between; height: 66px; }
.logo { display: flex; align-items: center; gap: 11px; color: #fff; font-weight: 700; font-size: 16.5px; }
.logo:hover { text-decoration: none; }
/* 品牌徽标：白标 + 品牌红圆角方块（logo-badge.svg 自带圆角，勿再叠加 border-radius） */
.logo-mark { width: 34px; height: 34px; flex: 0 0 34px; display: block; }
.logo small { display: block; font-size: 10.5px; font-weight: 500; color: #8FA6C8; letter-spacing: .04em; line-height: 1.3; }
.nav-links { display: flex; align-items: center; gap: 26px; }
.nav-links a { color: #C3D2E8; font-size: 14.5px; font-weight: 500; }
.nav-links a:hover { color: #fff; text-decoration: none; }
.nav-cta { display: flex; align-items: center; gap: 10px; }
.nav-toggle { display: none; background: none; border: 0; padding: 10px; cursor: pointer; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: #fff; border-radius: 2px; }
.nav-toggle span + span { margin-top: 5px; }

/* ---------- 01 首屏 ---------- */
.hero {
  position: relative;
  background:
    linear-gradient(var(--grid-b) 1px, transparent 1px) 0 0 / var(--grid-size) var(--grid-size),
    linear-gradient(90deg, var(--grid-b) 1px, transparent 1px) 0 0 / var(--grid-size) var(--grid-size),
    radial-gradient(1100px 520px at 78% -8%, rgba(62,155,214,.30), transparent 62%),
    radial-gradient(760px 460px at 4% 108%, rgba(72,116,203,.24), transparent 66%),
    linear-gradient(180deg, var(--dark-2), var(--dark));
  color: #EAF1FB; padding: 72px 0 0; overflow: hidden;
}
.hero-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 44px; align-items: center; }

/* AI 抽象化形象：数据流 + 节点网络（纯装饰层） */
.hero-art { position: absolute; inset: 0; z-index: 0; pointer-events: none; }
.hero-art svg { width: 100%; height: 100%; display: block; }
.hero > .wrap { position: relative; z-index: 1; }
.hero h1 { color: #fff; }
.hero h1 .hl {
  color: #7FD3F5;
  background: linear-gradient(180deg, transparent 62%, rgba(127,211,245,.20) 62%);
  padding: 0 2px;
}
.hero-sub { font-size: 17px; color: #B6C7E0; margin: 20px 0 0; max-width: 560px; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.hero-note { margin-top: 18px; font-size: 13.5px; color: #8FA6C8; display: flex; align-items: flex-start; gap: 8px; }
.hero-note svg { width: 15px; height: 15px; flex: 0 0 15px; margin-top: 5px; }

/* 首屏 · 双专家卡（无人像，讲"各自解决什么问题"） */
.hero-duo { position: relative; display: grid; gap: 14px; align-self: center; }
.hero-duo::before {
  content: ""; position: absolute; inset: -10% -6% 0;
  background: radial-gradient(closest-side, rgba(62,155,214,.22), transparent 76%);
}
.hd-card {
  position: relative; border-radius: var(--radius); padding: 22px 22px 18px;
  background: rgba(255,255,255,.055); border: 1px solid rgba(255,255,255,.13);
  -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px);
}
.hd-card.t2 { background: rgba(62,155,214,.09); border-color: rgba(127,211,245,.24); }
.hd-top { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
.hd-ico {
  width: 40px; height: 40px; flex: 0 0 40px; border-radius: 11px;
  background: rgba(255,255,255,.1); display: grid; place-items: center;
}
.hd-ico svg { width: 20px; height: 20px; stroke: #7FD3F5; }
.hd-card.t2 .hd-ico { background: rgba(127,211,245,.14); }
.hd-card.t2 .hd-ico svg { stroke: #9BC7F0; }
.hd-role { font-size: 12.5px; font-weight: 700; letter-spacing: .07em; color: #8FD0EE; }
.hd-card.t2 .hd-role { color: #9BC7F0; }
.hd-card h3 { color: #fff; font-size: 19.5px; line-height: 1.35; margin-top: 3px; }
.hd-list { margin: 0; padding: 0; list-style: none; }
.hd-list li {
  display: flex; gap: 10px; font-size: 14px; color: #BFD2EC; line-height: 1.68; padding: 7px 0;
}
.hd-list li::before {
  content: ""; flex: 0 0 5px; width: 5px; height: 5px; border-radius: 50%;
  background: var(--cyan); margin-top: .62em;
}
.hd-card.t2 .hd-list li::before { background: #9BC7F0; }
.hd-foot {
  margin-top: 12px; padding-top: 12px; border-top: 1px solid rgba(255,255,255,.12);
  font-size: 13px; color: #8FD0EE; line-height: 1.65;
}
.hd-bar {
  position: relative; margin-top: 14px; text-align: center;
  padding: 13px 16px; border-radius: var(--radius-sm);
  background: rgba(255,255,255,.07); border: 1px solid rgba(255,255,255,.14);
}
.hd-bar b { display: block; color: #fff; font-size: 15px; }
.hd-bar span { font-size: 12.8px; color: #A9BBD6; }

/* 表单校验提示 */
.field .err {
  display: none; font-size: 12.6px; color: #C8382F; margin-top: 6px; font-weight: 500;
}
.field.bad input, .field.bad select { border-color: #E08A84; background: #FEF8F8; }
.field.bad .err { display: block; }

/* 数据条（与首屏连片深色） */
.strip {
  background-color: var(--dark);
  background-image:
    linear-gradient(var(--grid-b) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-b) 1px, transparent 1px),
    radial-gradient(700px 320px at 10% 100%, rgba(72,116,203,.20), transparent 70%);
  background-size: var(--grid-size) var(--grid-size), var(--grid-size) var(--grid-size), auto;
  padding: 0 0 56px;
}
.strip-in {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 0;
  border-top: 1px solid rgba(255,255,255,.12);
}
.strip-item { padding: 30px 22px 0; border-left: 1px solid rgba(255,255,255,.09); display: flex; flex-direction: column; }
.strip-item:first-child { border-left: 0; padding-left: 0; }
.strip-num {
  font-size: 40px; font-weight: 800; line-height: 1.1; letter-spacing: -.02em;
  color: #fff; display: flex; align-items: baseline; gap: 4px;
}
.strip-num em { font-style: normal; font-size: 18px; font-weight: 600; color: var(--cyan); }
.strip-cap { font-size: 13.5px; color: #93A9C9; margin-top: 8px; line-height: 1.6; }
.strip-cap b { color: var(--cyan); font-weight: 700; }

/* 只在桌面生效的强制换行（移动端交给自然折行，避免拆散词语） */
.brk { display: none; }
@media (min-width: 769px) { .brk { display: inline; } }

/* ---------- 通用卡片 ---------- */
.grid { display: grid; gap: 20px; }
.g2 { grid-template-columns: repeat(2, 1fr); }
.g3 { grid-template-columns: repeat(3, 1fr); }
.g4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--white); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 26px 24px;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: #D3DEEE; }
.sec-soft .card { border-color: #E8EEF7; }
.card-ico {
  width: 42px; height: 42px; border-radius: 11px; margin-bottom: 16px;
  background: linear-gradient(140deg, rgba(72,116,203,.13), rgba(62,155,214,.13));
  display: grid; place-items: center;
}
.card-ico svg { width: 21px; height: 21px; stroke: var(--blue); }
.card h3 { margin-bottom: 9px; }
.card p { margin: 0; font-size: 14.8px; color: var(--gray); line-height: 1.78; }
.card-quote {
  margin-top: 14px; padding: 12px 14px; border-radius: var(--radius-sm);
  background: var(--bg-soft); border-left: 3px solid var(--blue);
  font-size: 14px; color: var(--navy); line-height: 1.7;
}
.sec-soft .card-quote { background: #fff; }

/* 标签云 */
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.chip {
  font-size: 13px; padding: 5px 12px; border-radius: 999px;
  background: rgba(72,116,203,.08); color: var(--navy-2); font-weight: 500;
}
.sec-dark .chip, .sec-dark-2 .chip { background: rgba(255,255,255,.09); color: #BFD2EC; }

/* 成本结构条 */
.costbar { margin-top: 34px; }
.costbar-track { display: flex; height: 46px; border-radius: var(--radius-sm); overflow: hidden; }
.costbar-seg { display: grid; place-items: center; color: #fff; font-size: 14px; font-weight: 600; }
.costbar-legend { display: flex; flex-wrap: wrap; gap: 22px; margin-top: 14px; font-size: 13.5px; color: var(--gray); }
.costbar-legend i { display: inline-block; width: 10px; height: 10px; border-radius: 3px; margin-right: 7px; }

/* ---------- 04 方法论（深色呼吸区） ---------- */
.model-hero {
  margin: 34px 0 40px; padding: 40px 32px; border-radius: var(--radius);
  background: rgba(255,255,255,.05); border: 1px solid rgba(255,255,255,.12);
  text-align: center;
}
.model-hero .mline {
  font-size: 34px; font-weight: 800; line-height: 1.5; letter-spacing: -.01em; color: #fff;
}
.model-hero .mtimes { color: var(--cyan); font-size: 24px; padding: 0 8px; font-weight: 600; }
.model-hero .mres {
  margin-top: 18px; padding-top: 20px; border-top: 1px dashed rgba(255,255,255,.2);
  font-size: 20px; color: #7FD3F5; font-weight: 700;
}
.insight { display: flex; gap: 14px; padding: 20px 0; border-top: 1px solid rgba(255,255,255,.1); }
.insight:last-child { border-bottom: 1px solid rgba(255,255,255,.1); }
.insight-n {
  flex: 0 0 30px; width: 30px; height: 30px; border-radius: 50%;
  background: var(--cyan); color: #06182E; font-weight: 800; font-size: 14px;
  display: grid; place-items: center;
}
.insight-b h4 { font-size: 16.5px; color: #fff; margin-bottom: 5px; font-weight: 700; }
.insight-b p { margin: 0; font-size: 14.8px; color: #A9BBD6; }

/* ---------- 05 场景 Tab ---------- */
.tabs { display: flex; flex-wrap: wrap; gap: 9px; margin-bottom: 26px; }
.tab {
  min-height: 44px; padding: 0 18px; border-radius: 999px; cursor: pointer;
  border: 1.5px solid var(--line); background: #fff; color: var(--gray);
  font-size: 14.5px; font-weight: 600; font-family: inherit;
  transition: all .16s ease;
}
.tab:hover { border-color: var(--blue); color: var(--blue); }
.tab[aria-selected="true"] { background: var(--navy); border-color: var(--navy); color: #fff; }
.tab b { font-weight: 700; }
.panel { display: none; }
.panel.on { display: block; animation: fade .3s ease; }
@keyframes fade { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

.scene {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; box-shadow: var(--shadow);
}
.scene-top {
  display: grid; grid-template-columns: 1.05fr .95fr; gap: 0;
}
.scene-txt { padding: 30px 30px 26px; }
.scene-tag {
  display: inline-block; font-size: 12.5px; font-weight: 700; letter-spacing: .04em;
  padding: 4px 11px; border-radius: 6px; background: rgba(184,148,77,.14); color: var(--gold);
  margin-bottom: 14px;
}
.scene-txt h3 { font-size: 21px; margin-bottom: 12px; }
.scene-row { margin-top: 16px; }
.scene-row .lbl {
  font-size: 12.5px; font-weight: 700; letter-spacing: .06em; color: var(--gray-2);
  display: block; margin-bottom: 5px;
}
.scene-row p { margin: 0; font-size: 14.8px; color: var(--gray); line-height: 1.78; }
.scene-metrics {
  background: linear-gradient(160deg, #F3F7FD, #EAF1FA);
  border-left: 1px solid var(--line);
  padding: 30px 26px; display: grid; align-content: center;
}
.metric-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px 16px; }
.metric .mv {
  font-size: 24px; font-weight: 800; color: var(--navy); line-height: 1.2; letter-spacing: -.02em;
}
.metric .ml { font-size: 13px; color: var(--gray); margin-top: 4px; }
.scene-foot {
  display: flex; flex-wrap: wrap; gap: 10px 26px; align-items: center;
  padding: 16px 30px; background: var(--bg-soft); border-top: 1px solid var(--line);
  font-size: 13.5px; color: var(--gray);
}
.scene-foot b { color: var(--navy-2); }

/* ---------- 06 实测成效 ---------- */
.result-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.result {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px 22px; border-top: 3px solid var(--blue);
}
.result:nth-child(2) { border-top-color: var(--gold); }
.result:nth-child(3) { border-top-color: var(--cyan); }
.result:nth-child(4) { border-top-color: var(--navy-2); }
.result .rn {
  font-size: 36px; font-weight: 800; color: var(--navy); line-height: 1.15;
  letter-spacing: -.02em; display: flex; align-items: baseline; gap: 3px;
}
.result .rn em { font-style: normal; font-size: 16px; font-weight: 700; color: var(--blue); }
.result .rc { font-size: 14px; color: var(--gray); margin-top: 10px; line-height: 1.7; }
.result .rs { font-size: 12.5px; color: var(--gray-2); margin-top: 10px; }

/* ---------- 07 时间轴 ---------- */
.step-axis { position: relative; margin-top: 12px; }
.step-axis::before {
  content: ""; position: absolute; left: 0; right: 0; top: 22px;
  height: 2px; background: linear-gradient(90deg, var(--blue), var(--cyan), var(--gold));
  opacity: .3;
}
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; position: relative; }
.step { padding-top: 0; display: flex; flex-direction: column; }
.step-dot {
  width: 44px; height: 44px; border-radius: 50%; background: #fff;
  border: 3px solid var(--blue); color: var(--navy);
  display: grid; place-items: center; font-weight: 800; font-size: 16px;
  position: relative; z-index: 1; margin-bottom: 18px;
}
.step:nth-child(2) .step-dot { border-color: var(--cyan); }
.step:nth-child(3) .step-dot { border-color: var(--navy-2); }
.step:nth-child(4) .step-dot { border-color: var(--gold); }
.step h3 { font-size: 17.5px; margin-bottom: 6px; }
.step .stime {
  display: inline-block; font-size: 12.5px; font-weight: 700; color: var(--blue);
  background: rgba(72,116,203,.09); padding: 3px 10px; border-radius: 6px; margin-bottom: 12px;
}
.step ul { margin: 0; padding: 0; list-style: none; }
.step li {
  font-size: 14.4px; color: var(--gray); padding-left: 16px; position: relative; line-height: 1.75;
}
.step li::before {
  content: ""; position: absolute; left: 0; top: .62em;
  width: 6px; height: 6px; border-radius: 50%; background: var(--line);
}
.step .out {
  margin-top: auto; font-size: 13.5px; color: var(--navy-2); font-weight: 600;
  padding-top: 12px; border-top: 1px dashed var(--line);
}

/* 警示条 */
.alert {
  display: flex; gap: 16px; align-items: flex-start;
  margin-top: 40px; padding: 22px 26px; border-radius: var(--radius);
  background: rgba(184,148,77,.09); border: 1px solid rgba(184,148,77,.28);
}
.alert svg { width: 22px; height: 22px; flex: 0 0 22px; margin-top: 2px; stroke: var(--gold); }
.alert p { margin: 0; font-size: 15px; color: #6B5220; line-height: 1.75; }
.alert b { color: #4E3C13; }

/* ---------- 08 双专家 ---------- */
.duo { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.duo-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px 26px; position: relative; overflow: hidden;
}
.duo-card::after {
  content: ""; position: absolute; inset: 0 auto 0 0; width: 4px;
  background: var(--blue);
}
.duo-card.t2::after { background: var(--cyan); }
.duo-role {
  font-size: 12.5px; font-weight: 700; letter-spacing: .06em; color: var(--blue);
  margin-bottom: 8px;
}
.duo-card.t2 .duo-role { color: #2C8DC4; }
.duo-card h3 { font-size: 20px; margin-bottom: 4px; }
.duo-card .who { font-size: 13.5px; color: var(--gray-2); margin-bottom: 18px; }
.duo-list { margin: 0; padding: 0; list-style: none; }
.duo-list li {
  display: flex; gap: 10px; font-size: 14.6px; color: var(--gray);
  padding: 9px 0; border-top: 1px dashed var(--line); line-height: 1.7;
}
.duo-list li:first-child { border-top: 0; }
.duo-list b { flex: 0 0 60px; color: var(--navy-2); font-weight: 600; }

/* ---------- 09 团队 ---------- */
.team-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 18px; }
.member {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; display: flex; flex-direction: column;
}
.member-ph {
  aspect-ratio: 2 / 3; position: relative; overflow: hidden;
  background: linear-gradient(175deg, #EFF4FB 0%, #E4EDF8 100%);
}
.member-ph img { width: 100%; height: auto; aspect-ratio: 2 / 3; object-fit: contain; object-position: bottom; }
.member.t1 .member-ph { background: linear-gradient(175deg, #E9F0FA, #DCE8F7); }
.member-body { padding: 18px 16px 20px; flex: 1; display: flex; flex-direction: column; }
.member-body h3 { font-size: 17px; margin-bottom: 5px; }
.member-role { font-size: 13px; color: var(--blue); font-weight: 600; line-height: 1.6; min-height: 40px; }
.member.t1 .member-role { color: var(--navy); }
.member-body .chips { margin-top: 12px; }
.member-body .chip { font-size: 12px; padding: 4px 9px; background: var(--bg-soft); color: var(--gray); }
.member-pending {
  aspect-ratio: 2 / 3; display: grid; place-items: center; text-align: center;
  background: repeating-linear-gradient(135deg, #F6F8FC, #F6F8FC 10px, #EFF3F9 10px, #EFF3F9 20px);
  border-bottom: 1px dashed var(--line);
}
.member-pending span { font-size: 12.5px; color: var(--gray-2); line-height: 1.7; }
.member-pending svg { width: 28px; height: 28px; stroke: #C3CDDC; margin: 0 auto 8px; }

/* AI 抽象化装饰：区块内节点簇 */
#checkup { position: relative; overflow: hidden; }
#checkup > .wrap { position: relative; z-index: 1; }
.sec-art {
  position: absolute; z-index: 0; pointer-events: none;
  top: -70px; right: -150px; width: 640px; opacity: .55;
}
.sec-art svg { width: 100%; height: auto; display: block; }

/* ---------- 10 自检清单（深色） ---------- */
.check-strip { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin: 30px 0 34px; }
.check-cell {
  padding: 22px 20px; border-radius: var(--radius);
  background: rgba(255,255,255,.05); border: 1px solid rgba(255,255,255,.1);
}
.check-cell .cn { font-size: 26px; font-weight: 800; color: #fff; line-height: 1.2; }
.check-cell .cl { font-size: 13px; color: #93A9C9; margin-top: 6px; }
.dims { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.dim {
  padding: 18px 18px; border-radius: var(--radius-sm);
  background: rgba(255,255,255,.045); border: 1px solid rgba(255,255,255,.09);
}
.dim b { display: block; color: #fff; font-size: 15px; margin-bottom: 6px; }
.dim span { font-size: 13.4px; color: #96ACCB; line-height: 1.7; }
.stage-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-top: 34px; }
.stage {
  padding: 18px; border-radius: var(--radius-sm); border: 1px solid rgba(255,255,255,.1);
  border-top: 3px solid #3E6DB5;
}
.stage:nth-child(2) { border-top-color: #4A8AC8; }
.stage:nth-child(3) { border-top-color: #4FB3D9; }
.stage:nth-child(4) { border-top-color: #6FD6C4; }
.stage b { display: block; color: #fff; font-size: 14.5px; margin-bottom: 4px; }
.stage em { font-style: normal; font-size: 12.5px; color: var(--cyan); font-weight: 600; }
.stage p { margin: 8px 0 0; font-size: 13.2px; color: #93A9C9; line-height: 1.7; }

/* ---------- 11 FAQ ---------- */
.faq { border-top: 1px solid var(--line); }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-q {
  width: 100%; text-align: left; background: none; border: 0; cursor: pointer;
  padding: 22px 46px 22px 0; position: relative; font-family: inherit;
  font-size: 17px; font-weight: 700; color: var(--navy); line-height: 1.55;
}
.faq-q:hover { color: var(--blue); }
.faq-q svg {
  position: absolute; right: 6px; top: 26px; width: 18px; height: 18px;
  stroke: var(--gray-2); transition: transform .2s ease;
}
.faq-item[data-open="1"] .faq-q svg { transform: rotate(180deg); stroke: var(--blue); }
.faq-a { display: none; padding: 0 0 24px; font-size: 15.2px; color: var(--gray); line-height: 1.85; }
.faq-item[data-open="1"] .faq-a { display: block; }
.faq-a strong { color: var(--navy-2); }

/* ---------- 12 预约 ---------- */
.cta-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: start; }
.deliver { margin: 0; padding: 0; list-style: none; }
.deliver li {
  display: flex; gap: 14px; padding: 15px 0; border-bottom: 1px dashed var(--line);
}
.deliver li:last-child { border-bottom: 0; }
.deliver .dn {
  flex: 0 0 26px; width: 26px; height: 26px; border-radius: 8px;
  background: rgba(72,116,203,.1); color: var(--blue);
  display: grid; place-items: center; font-size: 12.5px; font-weight: 700; margin-top: 2px;
}
.deliver b { display: block; color: var(--navy); font-size: 15.5px; }
.deliver span { font-size: 13.6px; color: var(--gray); }

/* 诊断怎么进行（说明式列表） */
.howto { margin: 0; padding: 0; list-style: none; }
.howto li {
  display: flex; gap: 12px; padding: 9px 0;
  font-size: 14.6px; color: var(--gray); line-height: 1.72;
}
.howto li b { color: var(--navy); }
.howto .hn {
  flex: 0 0 22px; width: 22px; height: 22px; border-radius: 50%;
  background: rgba(72,116,203,.12); color: var(--blue);
  font-size: 12.5px; font-weight: 700; display: grid; place-items: center; margin-top: 4px;
}

.form-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px 26px; box-shadow: var(--shadow);
}
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 14px; font-weight: 600; color: var(--navy); margin-bottom: 7px; }
.field input, .field select, .field textarea {
  width: 100%; font-family: inherit; font-size: 16px; color: var(--ink);
  padding: 12px 14px; border: 1.5px solid var(--line); border-radius: var(--radius-sm);
  background: #fff; transition: border-color .15s ease, box-shadow .15s ease;
}
.field textarea { resize: vertical; min-height: 84px; line-height: 1.7; }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--blue); box-shadow: 0 0 0 3px rgba(72,116,203,.12);
}
.field-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.form-card .btn { width: 100%; margin-top: 4px; }
.form-tip { font-size: 12.8px; color: var(--gray-2); margin-top: 12px; line-height: 1.7; text-align: center; }
.form-ok {
  display: none; text-align: center; padding: 20px 0 6px;
}
.form-ok svg { width: 46px; height: 46px; stroke: #3AA76D; margin: 0 auto 14px; }
.form-ok b { display: block; font-size: 18px; color: var(--navy); margin-bottom: 8px; }
.form-ok p { font-size: 14.5px; color: var(--gray); margin: 0 0 18px; }
.form-card.done .form-body { display: none; }
.form-card.done .form-ok { display: block; }

.qr-inline {
  display: flex; align-items: center; gap: 16px; margin-top: 20px;
  padding: 16px; border-radius: var(--radius-sm); background: var(--bg-soft);
}
.qr-inline img { width: 96px; height: 96px; height: auto; aspect-ratio: 1; border-radius: 8px; background: #fff; }
.qr-inline b { display: block; font-size: 14.6px; color: var(--navy); margin-bottom: 4px; }
.qr-inline span { font-size: 13px; color: var(--gray); line-height: 1.65; }

/* ============================================================
   新组件（三幕结构：趋势 / 竞争优势 / 我们的优势）
   ============================================================ */

/* 能力进化链 */
.chain { display: flex; flex-wrap: wrap; align-items: center; gap: 9px; margin-top: 26px; }
.chain-node {
  padding: 9px 15px; border-radius: 9px; font-size: 14px; font-weight: 600;
  background: #fff; border: 1px solid var(--line); color: var(--navy); line-height: 1.4;
}
.chain-node small { display: block; font-size: 11.5px; color: var(--gray-2); font-weight: 500; margin-top: 2px; }
.chain-node.final { background: var(--navy); color: #fff; border-color: var(--navy); }
.chain-node.final small { color: #9CC7F5; }
.chain-arrow { color: #C3CDDC; font-size: 14px; font-weight: 700; }

/* 两极分化 */
.diverge { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.dv-card { border-radius: var(--radius); padding: 28px 26px; border: 1px solid var(--line); }
.dv-card.hot { background: linear-gradient(160deg, #FFF9F0, #FCEFDC); border-color: #EFDFC2; }
.dv-card.cold { background: linear-gradient(160deg, #F3F8FE, #E7F0FA); border-color: #D3E1F3; }
.dv-tag {
  display: inline-block; font-size: 12.5px; font-weight: 700; padding: 4px 11px;
  border-radius: 6px; margin-bottom: 14px; letter-spacing: .02em;
}
.dv-card.hot .dv-tag { background: rgba(184,148,77,.2); color: #85641F; }
.dv-card.cold .dv-tag { background: rgba(72,116,203,.15); color: var(--navy-2); }
.dv-card h3 { font-size: 21px; margin-bottom: 10px; }
.dv-card > p { font-size: 14.6px; color: var(--gray); margin: 0 0 16px; line-height: 1.75; }
.dv-sub {
  font-size: 13.4px; color: var(--gray-2); padding-top: 15px;
  border-top: 1px dashed var(--line); margin-top: 18px; line-height: 1.75;
}
.dv-sub b { color: var(--navy-2); }
.dv-card .chip { background: rgba(255,255,255,.75); }

/* 层次阶梯 L1–L4 */
.ladder { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-top: 30px; }
.rung {
  padding: 18px 18px; border-radius: var(--radius-sm); background: #fff;
  border: 1px solid var(--line); border-left: 4px solid var(--blue);
}
.rung:nth-child(1) { border-left-color: #A9BBD6; }
.rung:nth-child(2) { border-left-color: #7FA9DE; }
.rung:nth-child(3) { border-left-color: var(--blue); }
.rung:nth-child(4) { border-left-color: var(--navy); }
.rung b { display: block; font-size: 14.6px; color: var(--navy); margin-bottom: 5px; }
.rung span { font-size: 13.2px; color: var(--gray); line-height: 1.68; }

/* 数据条引导语 */
.strip-lead {
  text-align: center; font-size: 15.5px; color: #A9BBD6;
  padding: 48px 0 30px; max-width: 780px; margin: 0 auto; line-height: 1.85;
}
.strip-lead b { color: #fff; }

/* 以前 → 现在 对照卡 */
.chg-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.chg {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; display: flex; flex-direction: column;
}
.chg-head { padding: 16px 22px 14px; border-bottom: 1px solid var(--line); }
.chg-head b { display: block; font-size: 16.5px; color: var(--navy); margin-bottom: 3px; }
.chg-head span { font-size: 12.8px; color: var(--gray-2); }
.chg-body { display: grid; grid-template-columns: 1fr 1fr; flex: 1; }
.chg-col { padding: 15px 20px 18px; }
.chg-col + .chg-col { border-left: 1px solid var(--line); background: rgba(72,116,203,.045); }
.chg-col .tag {
  display: inline-block; font-size: 11.5px; font-weight: 700; letter-spacing: .07em;
  padding: 3px 9px; border-radius: 5px; margin-bottom: 10px;
}
.chg-col.before .tag { background: #F0F2F6; color: var(--gray-2); }
.chg-col.after .tag { background: rgba(72,116,203,.13); color: var(--blue); }
.chg-col p { margin: 0; font-size: 13.9px; line-height: 1.72; color: var(--gray); }
.chg-col.after p { color: var(--ink); }
.chg-col p b { color: var(--navy); }

/* 原理：Goal–Action–Observation 循环（HTML 流式，双端自适应） */
.cycle {
  display: grid; grid-template-columns: 1fr auto 1fr auto 1fr;
  align-items: stretch; margin-top: 32px;
}
.cy-node {
  border: 1px solid var(--line); border-radius: var(--radius); background: #fff;
  padding: 22px 18px 20px; text-align: center;
}
.cy-node.dark { background: var(--navy); border-color: var(--navy); }
.cy-node .cy-n {
  display: inline-grid; place-items: center; width: 26px; height: 26px; border-radius: 50%;
  background: rgba(72,116,203,.12); color: var(--blue);
  font-size: 13px; font-weight: 800; margin-bottom: 10px;
}
.cy-node.dark .cy-n { background: rgba(255,255,255,.18); color: #fff; }
.cy-node b { display: block; font-size: 18px; color: var(--navy); line-height: 1.35; }
.cy-node em {
  display: block; font-style: normal; font-size: 11.5px;
  letter-spacing: .1em; color: var(--gray-2); margin-top: 3px;
}
.cy-node p { margin: 10px 0 0; font-size: 13.6px; color: var(--gray); line-height: 1.65; }
.cy-node.dark b { color: #fff; }
.cy-node.dark em { color: #9CC7F5; }
.cy-node.dark p { color: #BFD2EC; }
.cy-arrow { width: 36px; position: relative; }
.cy-arrow::before {
  content: ""; position: absolute; left: 2px; right: 9px; top: 50%;
  height: 2px; margin-top: -1px; background: #C3CDDC;
}
.cy-arrow::after {
  content: ""; position: absolute; right: 4px; top: 50%; margin-top: -5px;
  width: 8px; height: 8px; border-right: 2px solid #C3CDDC; border-bottom: 2px solid #C3CDDC;
  transform: rotate(-45deg);
}
.cy-loop {
  display: flex; align-items: center; justify-content: center; gap: 10px;
  margin-top: 20px; padding: 14px 20px; border-radius: var(--radius-sm);
  background: var(--bg-soft); border: 1px dashed #CBD8EA;
  font-size: 13.8px; color: var(--gray); line-height: 1.7;
}
.cy-loop svg { width: 18px; height: 18px; flex: 0 0 18px; stroke: var(--blue); }
.cy-loop strong { color: var(--navy); }

/* 原理三点说明 */
.cycle-legend {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px;
  margin-top: 26px;
}
.cycle-legend > div {
  padding: 16px 18px; border-radius: var(--radius-sm);
  background: var(--bg-soft); border-left: 3px solid var(--blue);
}
.cycle-legend b { display: block; font-size: 14.5px; color: var(--navy); margin-bottom: 5px; }
.cycle-legend span { font-size: 13.4px; color: var(--gray); line-height: 1.7; }

/* 四列特性网格（红线） */
.feat-grid.four { grid-template-columns: repeat(4, 1fr); }
.feat-grid.four .feat { padding: 22px 20px; }
.feat-grid.four .feat h3 { font-size: 16.5px; }

/* ---------- 对比表 ---------- */
.cmp-wrap { border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: #fff; }
.cmp-row { display: grid; grid-template-columns: .8fr 1fr 1.15fr; }
.cmp-row + .cmp-row { border-top: 1px solid var(--line); }
.cmp-row.head { background: var(--bg-soft); }
.cmp-cell { padding: 15px 20px; font-size: 14.3px; color: var(--gray); line-height: 1.72; }
.cmp-cell + .cmp-cell { border-left: 1px solid var(--line); }
.cmp-row.head .cmp-cell { font-size: 14px; font-weight: 700; color: var(--navy); }
.cmp-row.head .cmp-cell.c3 { color: var(--blue); }
.cmp-cell.k { font-weight: 600; color: var(--navy-2); background: var(--bg-soft); font-size: 13.8px; }
.cmp-cell.c2::before { content: ""; }
.cmp-cell.c3 { color: var(--ink); }

/* 层级图（非侵入式三层） */
.stack { display: grid; gap: 12px; margin-top: 30px; }
.stack-layer { border-radius: var(--radius); padding: 22px 24px; border: 1px solid var(--line); }
.stack-layer.top { background: linear-gradient(150deg, #1F3864, #2E5B9E); border-color: transparent; }
.stack-layer.mid { background: linear-gradient(150deg, #EAF1FB, #DBE7F7); border-color: #C9DAF1; }
.stack-layer.bot { background: var(--bg-soft); border-style: dashed; }
.stack-label { font-size: 12.5px; font-weight: 700; letter-spacing: .07em; margin-bottom: 13px; }
.stack-layer.top .stack-label { color: #9CC7F5; }
.stack-layer.mid .stack-label { color: var(--navy-2); }
.stack-layer.bot .stack-label { color: var(--gray-2); }
.stack-items { display: flex; flex-wrap: wrap; gap: 9px; }
.stack-chip {
  padding: 7px 13px; border-radius: 8px; font-size: 13.6px; font-weight: 600;
  background: #fff; border: 1px solid var(--line); color: var(--navy); line-height: 1.5;
}
.stack-chip em { font-style: normal; color: var(--gray-2); font-weight: 500; font-size: 12.4px; }
.stack-layer.top .stack-chip { background: rgba(255,255,255,.13); border-color: rgba(255,255,255,.22); color: #fff; }
.stack-layer.top .stack-chip em { color: #A9C9EF; }
.stack-layer.bot .stack-chip { background: #fff; color: var(--gray); font-weight: 500; }
.stack-note {
  margin-top: 16px; text-align: center; font-size: 13.4px; color: var(--gray-2);
}
.stack-note svg { width: 15px; height: 15px; vertical-align: -2px; stroke: var(--gray-2); margin-right: 5px; }

/* 六大特性 */
.feat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.feat {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px 22px; transition: transform .18s ease, box-shadow .18s ease;
}
.feat:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.feat-n { font-size: 12.5px; font-weight: 700; color: var(--blue); letter-spacing: .06em; margin-bottom: 10px; }
.feat h3 { font-size: 17.5px; margin-bottom: 9px; }
.feat h3 em { font-style: normal; font-size: 12.2px; color: var(--gray-2); font-weight: 500; margin-left: 7px; }
.feat p { margin: 0; font-size: 14.2px; color: var(--gray); line-height: 1.75; }
.feat .ex {
  margin-top: 13px; padding: 11px 13px; background: var(--bg-soft);
  border-radius: var(--radius-sm); border-left: 3px solid var(--blue);
  font-size: 13.2px; color: var(--navy-2); line-height: 1.7;
}

/* 交付闭环 */
.loop { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.loop-step {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px 20px; position: relative;
}
.loop-step::after {
  content: ""; position: absolute; right: -16px; top: 46px;
  width: 16px; height: 2px; background: var(--line);
}
.loop-step:last-child::after { display: none; }
.loop-n {
  width: 30px; height: 30px; border-radius: 9px; background: rgba(72,116,203,.1);
  color: var(--blue); display: grid; place-items: center;
  font-weight: 800; font-size: 13.5px; margin-bottom: 13px;
}
.loop-step h3 { font-size: 16.5px; margin-bottom: 7px; }
.loop-step p { margin: 0; font-size: 13.8px; color: var(--gray); line-height: 1.72; }
.loop-step .ok {
  margin-top: 13px; padding-top: 12px; border-top: 1px dashed var(--line);
  font-size: 13px; color: var(--navy-2); line-height: 1.65;
}
.loop-step .ok b { color: var(--blue); font-size: 12.2px; letter-spacing: .05em; display: block; margin-bottom: 3px; }

/* 交付保障内嵌深色卡 */
.gate-card {
  margin-top: 40px; border-radius: var(--radius); padding: 32px 30px;
  color: #C3D2E8;
  background-image:
    linear-gradient(var(--grid-b) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-b) 1px, transparent 1px),
    radial-gradient(620px 280px at 92% 0%, rgba(62,155,214,.30), transparent 68%),
    linear-gradient(150deg, var(--dark), #1B355E);
  background-size: var(--grid-size) var(--grid-size), var(--grid-size) var(--grid-size), auto, auto;
}
.gate-card h3 { color: #fff; font-size: 19px; margin-bottom: 6px; }
.gate-card > p { font-size: 14.6px; color: #A9BBD6; margin: 0 0 26px; }
.gate-col { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.gate-item { border-top: 2px solid rgba(255,255,255,.16); padding-top: 16px; }
.gate-item b { display: block; color: #fff; font-size: 15px; margin-bottom: 9px; }
.gate-item ul { margin: 0; padding: 0; list-style: none; }
.gate-item li {
  font-size: 13.6px; color: #A9BBD6; line-height: 1.72; padding-left: 15px; position: relative;
}
.gate-item li::before {
  content: ""; position: absolute; left: 0; top: .66em;
  width: 5px; height: 5px; border-radius: 50%; background: var(--cyan);
}

/* 趋势区块的三阶段 */
.eras { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 30px; }
.era {
  border-radius: var(--radius); padding: 26px 24px; border: 1px solid var(--line);
  background: #fff; position: relative;
}
.era.now { background: linear-gradient(155deg, #1F3864, #2C5896); border-color: transparent; }
.era-year { font-size: 12.5px; font-weight: 700; letter-spacing: .06em; color: var(--gray-2); margin-bottom: 10px; }
.era.now .era-year { color: #8FD0EE; }
.era h3 { font-size: 20px; margin-bottom: 9px; }
.era.now h3 { color: #fff; }
.era p { margin: 0; font-size: 14.4px; color: var(--gray); line-height: 1.75; }
.era.now p { color: #BFD2EC; }
.era .verdict {
  margin-top: 15px; padding-top: 13px; border-top: 1px dashed var(--line);
  font-size: 13.4px; color: var(--navy-2); font-weight: 600;
}
.era.now .verdict { border-top-color: rgba(255,255,255,.2); color: #7FD3F5; }

/* ---------- 页脚 ---------- */
.footer {
  background-color: var(--dark-2); color: #93A9C9; padding: 54px 0 28px; font-size: 14px;
  background-image:
    linear-gradient(var(--grid-b) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-b) 1px, transparent 1px),
    radial-gradient(820px 380px at 88% 0%, rgba(62,155,214,.14), transparent 68%);
  background-size: var(--grid-size) var(--grid-size), var(--grid-size) var(--grid-size), auto;
}
.footer-top { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 34px; padding-bottom: 32px; border-bottom: 1px solid rgba(255,255,255,.09); }
.footer .logo { margin-bottom: 14px; }
.footer p { margin: 0 0 8px; line-height: 1.8; }
.footer h4 { color: #fff; font-size: 14.5px; margin-bottom: 14px; }
.footer ul { margin: 0; padding: 0; list-style: none; }
.footer li { margin-bottom: 9px; }
.footer a { color: #93A9C9; }
.footer a:hover { color: #fff; }
.footer-bot {
  display: flex; flex-wrap: wrap; gap: 10px 22px; justify-content: space-between;
  padding-top: 22px; font-size: 13px; color: #6E86A8;
}

/* 备案信息（工信部要求：底部展示 + 链接至备案系统） */
.footer-record {
  display: flex; flex-wrap: wrap; align-items: center; gap: 10px;
  padding-top: 16px; margin-top: 16px;
  border-top: 1px solid rgba(255,255,255,.08);
  font-size: 13px; color: #6E86A8;
}
.footer-record a { color: #93A9C9; text-decoration: none; transition: color .2s; }
.footer-record a:hover { color: #fff; text-decoration: underline; }
.footer-record-sep { color: rgba(255,255,255,.2); }
.footer-record-txt { color: #6E86A8; }
.footer-record-todo { color: #5A7096; }

/* ---------- 移动端 ---------- */
@media (max-width: 1024px) {
  .team-grid { grid-template-columns: repeat(3, 1fr); }
  .result-grid { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .step-axis::before { display: none; }
  .dims { grid-template-columns: repeat(2, 1fr); }
  .stage-row { grid-template-columns: repeat(2, 1fr); }
  .feat-grid { grid-template-columns: repeat(2, 1fr); }
  .feat-grid.four { grid-template-columns: repeat(2, 1fr); }
  .loop { grid-template-columns: repeat(2, 1fr); }
  .loop-step::after { display: none; }
  .ladder { grid-template-columns: repeat(2, 1fr); }
  .eras { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .wrap { padding: 0 18px; }
  .sec { padding: 56px 0; }
  h1 { font-size: 30px; }
  h2 { font-size: 25px; }
  h3 { font-size: 17px; }
  .lede { font-size: 15.5px; }
  .sec-head { margin-bottom: 30px; }

  .nav-links { display: none; }
  .nav-toggle { display: block; }
  .nav-cta .btn { display: none; }
  .nav.open .nav-links {
    display: flex; flex-direction: column; align-items: stretch; gap: 0;
    position: absolute; left: 0; right: 0; top: 66px;
    background: #0E1B36; border-bottom: 1px solid rgba(255,255,255,.1);
    padding: 8px 18px 18px;
  }
  .nav.open .nav-links a { padding: 14px 0; border-bottom: 1px solid rgba(255,255,255,.07); font-size: 16px; }

  .hero { padding: 46px 0 0; }
  .hero-art { display: none; }
  .sec-art { display: none; }
  .hero-grid { grid-template-columns: 1fr; gap: 28px; }
  .hero-sub { font-size: 16px; }
  .hero-duo { gap: 11px; }
  .hd-card { padding: 18px 18px 15px; }
  .hd-card h3 { font-size: 17.5px; }
  .hd-list li { font-size: 13.4px; padding: 6px 0; }
  .hd-foot { font-size: 12.6px; }
  .hd-bar { margin-top: 11px; padding: 10px 14px; }
  .hd-bar b { font-size: 14.2px; }
  .hero-cta .btn { width: 100%; }

  .strip { padding-bottom: 40px; }
  .strip-in { grid-template-columns: 1fr; }
  .strip-item {
    border-left: 0; border-top: 1px solid rgba(255,255,255,.09);
    padding: 20px 0 0;
  }
  .strip-item:first-child { padding-top: 24px; }
  .strip-num { font-size: 26px; }
  .strip-num em { font-size: 14px; }
  .strip-cap { font-size: 12.8px; }

  .g2, .g3, .g4 { grid-template-columns: 1fr; }
  .result-grid, .team-grid { grid-template-columns: 1fr 1fr; }
  .steps { grid-template-columns: 1fr; gap: 26px; }
  .dims, .stage-row { grid-template-columns: 1fr; }
  .check-strip { grid-template-columns: 1fr 1fr; }
  .duo { grid-template-columns: 1fr; }
  .cta-grid { grid-template-columns: 1fr; gap: 28px; }
  .scene-top { grid-template-columns: 1fr; }
  .scene-metrics { border-left: 0; border-top: 1px solid var(--line); }
  .metric .mv { font-size: 21px; }
  .model-hero { padding: 26px 20px; }
  .model-hero .mline { font-size: 22px; }
  .model-hero .mtimes { font-size: 17px; padding: 0 4px; }
  .model-hero .mres { font-size: 16.5px; }
  .costbar-track { height: 38px; }
  .costbar-seg { font-size: 12px; }
  .footer-top { grid-template-columns: 1fr; gap: 26px; }
  .tab { padding: 0 15px; font-size: 14px; }
  .scene-txt { padding: 22px 20px; }
  .scene-metrics { padding: 22px 20px; }
  .scene-foot { padding: 14px 20px; }
  .field-2 { grid-template-columns: 1fr; }
  .qr-inline img { width: 84px; height: auto; }
  .result .rn { font-size: 26px; }
  .result .rn em { font-size: 14px; }
  .member-body { padding: 14px 12px 16px; }
  .member-body h3 { font-size: 15.5px; }
  .member-role { font-size: 12.4px; min-height: 46px; }
  .card { padding: 22px 20px; }
  body { padding-bottom: env(safe-area-inset-bottom); }

  /* 新组件移动端 */
  .diverge { grid-template-columns: 1fr; }
  .feat-grid { grid-template-columns: 1fr; }
  .loop { grid-template-columns: 1fr; }
  .ladder { grid-template-columns: 1fr; }
  .gate-col { grid-template-columns: 1fr; gap: 20px; }
  .gate-card { padding: 24px 20px; }
  .chain { gap: 8px; }
  .chain-node { font-size: 13.4px; padding: 8px 12px; }
  .chain-arrow { display: none; }
  .dv-card, .era { padding: 22px 20px; }
  .stack-layer { padding: 18px 18px; }
  .stack-chip { font-size: 13px; padding: 6px 11px; }

  /* V3 新组件移动端 */
  .strip-lead { padding: 32px 0 22px; font-size: 14.6px; }
  .chg-grid { grid-template-columns: 1fr; }
  .chg-head { padding: 14px 18px 12px; }
  .chg-col { padding: 13px 18px 16px; }
  .chg-col p { font-size: 13.4px; }
  .cycle { grid-template-columns: 1fr; }
  .cy-node { padding: 18px 18px 16px; }
  .cy-node b { font-size: 17px; }
  .cy-arrow { width: 100%; height: 30px; }
  .cy-arrow::before {
    left: 50%; right: auto; top: 2px; bottom: 11px;
    width: 2px; height: auto; margin-top: 0; margin-left: -1px;
  }
  .cy-arrow::after {
    left: 50%; right: auto; top: auto; bottom: 5px;
    margin-top: 0; margin-left: -5px; transform: rotate(45deg);
  }
  .cy-loop { flex-direction: column; text-align: center; gap: 8px; font-size: 13.2px; }
  .cycle-legend { grid-template-columns: 1fr; gap: 12px; }
  .feat-grid.four { grid-template-columns: 1fr; }

  /* 对比表窄屏改堆叠卡片 */
  .cmp-row { grid-template-columns: 1fr; }
  .cmp-row.head { display: none; }
  .cmp-cell { padding: 12px 16px; font-size: 14px; }
  .cmp-cell + .cmp-cell { border-left: 0; border-top: 1px solid var(--line); }
  .cmp-cell.k { font-size: 14.6px; padding-bottom: 8px; }
  .cmp-cell.c2::before { content: "PC 桌面工具 ｜ "; color: var(--gray-2); font-weight: 700; }
  .cmp-cell.c3::before { content: "企业级 AI ｜ "; color: var(--blue); font-weight: 700; }
}

@media (max-width: 360px) {
  .result-grid, .check-strip { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
}

/* 锚点滚动补偿（顶部固定导航） */
section[id] { scroll-margin-top: 74px; }

/* ---------- 浮动快跳：一键置顶 / 一键到底 ----------
   长页必备。整组在滚动超过一屏后淡入；两个方向各自到达端点时转为"禁用态"
   （用 opacity 变淡而不是 display:none —— 保住占位，按钮不会上下跳动）。 */
.quickjump {
  position: fixed; right: 26px; bottom: 32px; z-index: 55;
  display: flex; flex-direction: column; gap: 10px;
  opacity: 0; visibility: hidden; transform: translateY(10px);
  transition: opacity .26s ease, transform .26s ease, visibility .26s;
}
.quickjump.on { opacity: 1; visibility: visible; transform: none; }

.qj-btn {
  width: 46px; height: 46px; padding: 0; margin: 0;
  display: grid; place-items: center;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,.16);
  background: rgba(14,27,54,.92);
  color: #CBDCF2; cursor: pointer;
  box-shadow: 0 6px 20px rgba(11,23,48,.30);
  transition: background .2s ease, color .2s ease,
              border-color .2s ease, transform .2s ease, opacity .2s ease;
}
.qj-btn svg { width: 22px; height: 22px; }
.qj-btn:hover { background: var(--blue); border-color: var(--blue); color: #fff; }
.qj-btn:active { transform: scale(.93); }
.qj-btn:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; }
.qj-btn[aria-disabled="true"] { opacity: .32; cursor: default; }
.qj-btn[aria-disabled="true"]:hover {
  background: rgba(14,27,54,.92); border-color: rgba(255,255,255,.16); color: #CBDCF2;
}

/* 视口宽度不足以让按钮落在内容栏（1180px）右侧时，页脚末行右侧留白避让。
   临界点：内容栏右缘 = vw/2 + 566；按钮左缘 = vw - 72 → vw < 1276 起重叠。
   取 1300 留余量。 */
@media (min-width: 769px) and (max-width: 1300px) {
  .footer-bot { padding-right: 96px; }
}

@media (max-width: 768px) {
  .quickjump {
    right: 16px; bottom: calc(20px + env(safe-area-inset-bottom));
    gap: 9px;
  }
  .qj-btn { width: 48px; height: 48px; }
  .qj-btn svg { width: 22px; height: 22px; }
  /* 底部预留浮动按钮空间，避免压住页脚文字（按钮组高约 105px + 下边距 20px） */
  .footer { padding-bottom: 152px; }
  .footer-bot { padding-right: 0; }
}