/* ═══════════════════════════════════════════════════════════════
   知缘 · 线上陪伴数字化运营平台 — 招商官网（ym.damei.host）
   视觉方案：《ym官网视觉方案_v1.md》· 深启浅承（Primary）
   配色：活力橙 #FF6B35 / 琥珀金 #FFB800 / 深空夜 #121317 / 荧光绿 #AAFF4B(点缀)
   动效点位：M1–M14 + G1(prefers-reduced-motion) + G2(平滑锚点)
   技术：纯 CSS，无框架；动效 CSS keyframes/transition，JS 仅补位
   ═══════════════════════════════════════════════════════════════ */

/* ---------- Design Tokens（§3.1） ---------- */
:root {
  --primary: #FF6B35;          /* 活力橙：主按钮/Hero关键词/Active */
  --gold: #FFB800;             /* 琥珀金：认证/权益/数字高亮/金色渐变尾 */
  --neon: #AAFF4B;             /* 荧光绿：仅动效点缀 ≤5% 面积 */
  --info: #4A90E2;             /* 功能蓝 */
  --success: #00BFA5;          /* 成功绿 */
  --accent: #7C4DFF;           /* 会员紫：合伙人权益 */
  --ink: #121317;              /* 深空底 */
  --ink-card: #1E1F24;         /* 深空卡片 */
  --ink-line: rgba(255,255,255,0.08);
  --ink-text: #E8EAED;         /* 深色区正文 */
  --ink-dim: #9AA0A9;          /* 深色区次要文字 */
  --bg: #F5F6FA;               /* 浅色背景 */
  --card: #FFFFFF;             /* 卡片白 */
  --title: #1A1A2E;            /* 浅色区标题/正文 */
  --muted: #667085;            /* 浅色区次要文字 */
  --line: #E5E7EB;             /* 浅色分隔线 */
  --grad: linear-gradient(135deg, #FF6B35 0%, #FFB800 100%);
  --hero-bg: radial-gradient(1200px 600px at 70% -10%, rgba(255,107,53,0.20), transparent 60%), #121317;
  --shadow-card: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-dark: 0 12px 32px rgba(0,0,0,0.35);
  --shadow-hover: 0 16px 40px rgba(255,107,53,0.18);
  --radius-btn: 999px;
  --radius-md: 12px;
  --radius-card: 16px;
  --radius-lg: 24px;
  --container: 1200px;
  --font: "PingFang SC","Noto Sans SC","Microsoft YaHei",-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-num: "Inter",-apple-system,"PingFang SC",sans-serif;
  --nav-h: 64px;
  --top-h: 30px;
}

/* ---------- Reset / Base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + var(--top-h) + 12px); } /* G2 */
body {
  font-family: var(--font);
  color: var(--title);
  background: var(--bg);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: var(--info); text-decoration: none; }
em, b { font-style: normal; }
ul, ol { list-style: none; }
h1,h2,h3 { line-height: 1.25; }
:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }

/* ---------- 通用组件 ---------- */
.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: var(--radius-btn); border: 0; cursor: pointer;
  font-family: inherit; font-weight: 600; text-align: center;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease, color .2s ease;
  -webkit-tap-highlight-color: transparent;
  min-height: 44px; /* 触控目标 ≥44px */
}
.btn-primary {
  background: var(--grad); color: #fff;
  box-shadow: 0 6px 18px rgba(255,107,53,0.30);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: var(--shadow-hover); }
.btn-primary:active { transform: translateY(0); }
.btn-ghost {
  background: transparent; color: var(--ink-text);
  border: 1px solid rgba(255,255,255,0.28);
}
.btn-ghost:hover { border-color: var(--gold); color: var(--gold); transform: translateY(-2px); }
.btn-sm { padding: 0 18px; min-height: 40px; font-size: 14px; }
.btn-lg { padding: 0 30px; min-height: 52px; font-size: 17px; }
.btn-block { width: 100%; }

.badge {
  display: inline-block; padding: 2px 10px; border-radius: 999px;
  font-size: 12px; font-weight: 600; vertical-align: middle;
}
.badge-success { background: rgba(0,191,165,.14); color: var(--success); }
.badge-warn { background: rgba(255,184,0,.15); color: var(--gold); }

.section { padding: 96px 0; }
.section-light { background: var(--bg); }
.section-white { background: var(--card); }
.section-dark {
  background:
    radial-gradient(900px 480px at 85% -10%, rgba(255,184,0,0.12), transparent 60%),
    radial-gradient(700px 420px at -10% 110%, rgba(255,107,53,0.12), transparent 60%),
    var(--ink);
  color: var(--ink-text);
}
.section-head { max-width: 820px; margin-bottom: 56px; }
.section-tag {
  display: inline-block; color: var(--primary); font-weight: 700; font-size: 14px;
  letter-spacing: 2px; margin-bottom: 12px;
}
.section-tag::before { content: "· "; color: var(--gold); }
.section-tag-light { color: var(--gold); }
.section-head h2 { font-size: 40px; font-weight: 800; color: var(--title); margin-bottom: 16px; }
.section-dark .section-head h2 { color: var(--ink-text); }
.section-head h2 em { color: var(--primary); background: linear-gradient(transparent 62%, rgba(255,107,53,.22) 62%); }
.section-dark .section-head h2 em { color: var(--gold); background: none; }
.section-lead { font-size: 17px; color: var(--muted); }
.section-dark .section-lead { color: var(--ink-dim); }

.chip {
  display: inline-block; padding: 4px 12px; border-radius: 999px;
  background: rgba(255,107,53,.08); color: var(--primary);
  font-size: 12px; font-weight: 600;
}
.chip-link { background: rgba(74,144,226,.12); color: var(--info); }

/* ---------- 顶部合规声明条（M1 500ms 淡入）+ 导航 ---------- */
.topstrip {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--top-h); display: flex; align-items: center; justify-content: center; gap: 8px;
  background: linear-gradient(90deg, #101114, #1a1b20); color: var(--ink-dim);
  font-size: 12px; border-bottom: 1px solid var(--ink-line);
  animation: stripIn .5s ease both;
}
.topstrip strong { color: var(--gold); }
.topstrip-dot {
  width: 6px; height: 6px; border-radius: 50%; background: var(--neon);
  box-shadow: 0 0 8px var(--neon); animation: pulseDot 2.4s ease-in-out infinite;
}
.topstrip-link { color: var(--gold); margin-left: 6px; }
@keyframes stripIn { from { opacity: 0; transform: translateY(-6px); } to { opacity: 1; transform: translateY(0); } }
@keyframes pulseDot { 0%,100% { opacity: .5; } 50% { opacity: 1; } }

/* 导航（fixed 毛玻璃 blur/8px，滚动后加深） */
.nav {
  position: fixed; top: var(--top-h); left: 0; right: 0; z-index: 90;
  height: var(--nav-h);
  background: rgba(18,19,23,.55);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid transparent;
  transition: background .3s ease, border-color .3s ease;
}
.nav.scrolled { background: rgba(18,19,23,.92); border-bottom-color: var(--ink-line); }
.nav-inner {
  max-width: var(--container); margin: 0 auto; padding: 0 24px;
  height: 100%; display: flex; align-items: center; gap: 24px;
}
.brand { display: inline-flex; align-items: center; gap: 8px; color: var(--ink-text); }
.brand-logo { filter: drop-shadow(0 0 6px rgba(170,255,75,.35)); }
.brand-name { font-weight: 800; font-size: 19px; letter-spacing: 1px; }
.brand-sub { font-size: 12px; color: var(--ink-dim); }
.nav-links { display: flex; gap: 4px; margin: 0 auto; }
.nav-links a {
  color: var(--ink-dim); font-size: 15px; padding: 8px 14px; border-radius: 999px;
  transition: color .2s ease, background .2s ease;
}
.nav-links a:hover, .nav-links a.active { color: var(--gold); background: rgba(255,184,0,.10); }
.nav-actions { display: flex; align-items: center; gap: 12px; }
.nav-burger {
  display: none; width: 44px; height: 44px; border: 0; border-radius: 10px;
  background: rgba(255,255,255,.08); cursor: pointer;
  flex-direction: column; align-items: center; justify-content: center; gap: 5px;
}
.nav-burger span { display: block; width: 20px; height: 2px; background: var(--ink-text); border-radius: 2px; transition: transform .25s ease, opacity .25s ease; }
.nav-burger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-burger.open span:nth-child(2) { opacity: 0; }
.nav-burger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* 移动端抽屉 */
.nav-drawer {
  position: fixed; top: calc(var(--top-h) + var(--nav-h)); right: 0; left: 0; z-index: 85;
  background: rgba(18,19,23,.98); border-bottom: 1px solid var(--ink-line);
  display: none; flex-direction: column; padding: 12px 24px 24px; gap: 4px;
}
.nav-drawer.open { display: flex; }
.nav-drawer a { color: var(--ink-text); font-size: 17px; padding: 14px 8px; border-bottom: 1px solid var(--ink-line); }
.nav-drawer .btn { border-bottom: 0; margin-top: 14px; }

/* ---------- ① HERO ---------- */
.hero {
  position: relative; overflow: hidden;
  background: var(--hero-bg); color: var(--ink-text);
  padding: calc(var(--top-h) + var(--nav-h) + 88px) 0 120px;
  min-height: 100vh; display: flex; align-items: center;
}
.hero::after { /* 底部荧光能量带（M4 视觉底座） */
  content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 2px;
  background: linear-gradient(90deg, transparent, var(--neon), transparent);
  opacity: .5;
}
.hero-inner {
  position: relative; z-index: 2;
  max-width: var(--container); margin: 0 auto; padding: 0 24px;
  display: grid; grid-template-columns: 1.15fr .85fr; gap: 48px; align-items: center;
}
.hero-eyebrow {
  display: flex; align-items: center; gap: 8px; color: var(--gold);
  font-weight: 600; font-size: 14px; letter-spacing: 1px; margin-bottom: 18px;
}
.hero-eyebrow-bar { width: 26px; height: 2px; background: var(--grad); border-radius: 2px; }
.hero-title {
  font-size: clamp(40px, 6vw, 68px); font-weight: 900; line-height: 1.15;
  letter-spacing: 2px; margin-bottom: 24px;
}
.hero-title em { color: #fff; background: linear-gradient(135deg, var(--primary), var(--gold)); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; text-shadow: none; }
.hero-sub { color: var(--ink-dim); font-size: 18px; margin-bottom: 32px; }
.hero-sub b { color: var(--ink-text); }
.hero-cta { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 22px; }
.hero-note { font-size: 13px; color: var(--ink-dim); }

/* Hero 文字逐行入场 M2 */
.hero-line { display: block; }
.reveal { opacity: 0; transform: translateY(24px); }
.reveal.in-view { animation: riseIn .6s ease forwards; }
@keyframes riseIn { from { opacity: 0; transform: translateY(24px); } to { opacity: 1; transform: translateY(0); } }
.hero-line-1 { animation-delay: .12s; }
.hero-line-2 { animation-delay: .24s; }
.hero-sub.in-view { animation-delay: .36s; }
.hero-cta.in-view { animation-delay: .48s; }
.hero-note.in-view { animation-delay: .6s; }

/* 数据浮卡 M3 */
.hero-card {
  background: rgba(30,31,36,.72); border: 1px solid var(--ink-line);
  border-radius: var(--radius-lg); padding: 24px;
  box-shadow: var(--shadow-dark); position: relative; overflow: hidden;
}
.hero-card::before { /* 金色渐变尾 */
  content: ""; position: absolute; inset: auto 0 0 0; height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--gold)); border-radius: 2px;
}
.hero-card-head {
  display: flex; align-items: center; gap: 8px;
  color: var(--gold); font-weight: 700; font-size: 15px; margin-bottom: 18px;
}
.pulse-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--neon); box-shadow: 0 0 10px var(--neon); animation: pulseDot 1.6s ease-in-out infinite; }
.hero-stats { display: grid; gap: 14px; }
.stat { display: flex; align-items: baseline; justify-content: space-between; border-bottom: 1px dashed var(--ink-line); padding-bottom: 10px; }
.stat dt { color: var(--ink-dim); font-size: 13px; }
.stat dd { color: var(--ink-text); font-size: 15px; }
.stat dd b { font-family: var(--font-num); font-size: 26px; font-weight: 800; color: #fff; }
.stat dd b.count { background: linear-gradient(135deg, var(--primary), var(--gold)); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.hero-card-note { font-size: 11px; color: var(--ink-dim); margin-top: 12px; }

/* 荧光粒子条 M4（CSS 光点循环上浮） */
.hero-particles { position: absolute; inset: 0; pointer-events: none; z-index: 1; }
.hero-particles i {
  position: absolute; bottom: -12px; width: 4px; height: 4px; border-radius: 50%;
  background: var(--neon); box-shadow: 0 0 8px var(--neon); opacity: 0;
  animation: particleUp 3s linear infinite;
}
.hero-particles i:nth-child(1) { left: 8%;  animation-delay: 0s; }
.hero-particles i:nth-child(2) { left: 22%; animation-delay: .6s; animation-duration: 3.6s; }
.hero-particles i:nth-child(3) { left: 37%; animation-delay: 1.1s; }
.hero-particles i:nth-child(4) { left: 51%; animation-delay: .4s; animation-duration: 3.2s; }
.hero-particles i:nth-child(5) { left: 63%; animation-delay: 1.5s; }
.hero-particles i:nth-child(6) { left: 74%; animation-delay: .9s; animation-duration: 3.8s; }
.hero-particles i:nth-child(7) { left: 82%; animation-delay: 1.9s; }
.hero-particles i:nth-child(8) { left: 90%; animation-delay: 2.3s; animation-duration: 3.4s; }
.hero-particles i:nth-child(9) { left: 47%; animation-delay: 2.6s; }
.hero-particles i:nth-child(10){ left: 68%; animation-delay: 2.9s; animation-duration: 3.5s; }
@keyframes particleUp {
  0% { transform: translateY(0); opacity: 0; }
  12% { opacity: .8; }
  100% { transform: translateY(-70vh); opacity: 0; }
}

/* 首屏滚动视差 M5：桌面 pointer:fine 由 JS 加类触发 */
.hero.parallax .hero-parallax { will-change: transform; }

/* ---------- ② 业务全景 ---------- */
.system-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.system-tools { margin-top: 56px; }
.system-tools-title { font-size: 22px; font-weight: 800; margin-bottom: 20px; position: relative; padding-left: 14px; }
.system-tools-title::before { content: ""; position: absolute; left: 0; top: 6px; bottom: 6px; width: 4px; border-radius: 2px; background: var(--grad); }
.grid-tools { grid-template-columns: repeat(3, 1fr); }

.card { width: 100%; }
.tile {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius-card);
  padding: 24px; box-shadow: var(--shadow-card);
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease; /* M7 200ms */
}
.tile:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: var(--primary); /* M7 hover 描边 */
}
.tile-icon {
  width: 46px; height: 46px; border-radius: 14px; margin-bottom: 16px;
  display: flex; align-items: center; justify-content: center;
  font-size: 15px; font-weight: 800; color: #fff; background: var(--ink-card);
  border: 1px solid rgba(255,107,53,.5);
  box-shadow: 0 0 0 0 rgba(170,255,75,0); /* 辉光描边兜底 */
  transition: box-shadow .2s ease;
}
.tile:hover .tile-icon { box-shadow: 0 0 14px rgba(170,255,75,.45); }
.ic-app { background: linear-gradient(135deg, #FF6B35, #FFB800); }
.ic-wx { background: linear-gradient(135deg, #2AAE67, #07C160); }
.ic-dy { background: linear-gradient(135deg, #1a1a2e, #3a3a5c); }
.ic-h5 { background: linear-gradient(135deg, #4A90E2, #7C4DFF); }
.ic-qq { background: linear-gradient(135deg, #4A90E2, #2f7fd0); }
.ic-link { background: linear-gradient(135deg, #FF6B35, #FFB800); }
.ic-ai { background: linear-gradient(135deg, #7C4DFF, #4A90E2); }
.tile-title { font-size: 18px; font-weight: 800; margin-bottom: 10px; color: var(--title); }
.tile-desc { font-size: 14px; color: var(--muted); margin-bottom: 16px; min-height: 66px; }
.tile .chip { margin-bottom: 14px; }

/* 产品截图占位（素材待老梁提供） */
.mock-screen {
  margin-top: 14px; aspect-ratio: 16/9; border-radius: 12px;
  background:
    linear-gradient(135deg, rgba(255,107,53,.12), rgba(255,184,0,.10)),
    repeating-linear-gradient(45deg, rgba(30,31,36,.06) 0 8px, transparent 8px 16px);
  border: 1px dashed var(--line);
  display: flex; align-items: center; justify-content: center;
}
.mock-label {
  font-size: 12px; color: var(--muted); background: rgba(255,255,255,.8);
  padding: 4px 12px; border-radius: 999px; border: 1px dashed var(--line);
}

/* ---------- ③ 客户解决方案 ---------- */
.solutions-list { display: grid; gap: 28px; }
.sol-card {
  display: grid; grid-template-columns: 1fr 260px; gap: 24px;
  background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius-lg);
  padding: 32px; box-shadow: var(--shadow-card);
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.sol-card:hover { box-shadow: var(--shadow-hover); border-color: rgba(255,107,53,.4); }
.sol-main { display: grid; gap: 20px; }
.sol-badge { display: flex; align-items: center; gap: 14px; }
.sol-badge h3 { font-size: 22px; font-weight: 800; }
.sol-badge-icon {
  width: 52px; height: 52px; border-radius: 16px; flex: none;
  display: flex; align-items: center; justify-content: center;
  font-size: 19px; font-weight: 800; color: #fff;
  box-shadow: 0 8px 20px rgba(255,107,53,.25);
}
.ic-s1 { background: linear-gradient(135deg, #FF6B35, #FFB800); }
.ic-s2 { background: linear-gradient(135deg, #1E1F24, #4a4a5c); }
.ic-s3 { background: linear-gradient(135deg, #7C4DFF, #4A90E2); }
.ic-s4 { background: linear-gradient(135deg, #FFB800, #FF6B35); }
.sol-sub { color: var(--muted); font-size: 13px; }
.sol-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.sol-block h4 {
  font-size: 13px; color: var(--primary); letter-spacing: 1px;
  margin-bottom: 10px; display: flex; align-items: center; gap: 6px;
}
.sol-block h4::before { content: ""; width: 6px; height: 6px; border-radius: 2px; background: var(--gold); }
.sol-block ul { display: grid; gap: 8px; }
.sol-block li { font-size: 14px; color: var(--title); padding-left: 16px; position: relative; }
.sol-block li::before { content: "›"; position: absolute; left: 0; color: var(--primary); font-weight: 700; }
.sol-gain {
  background: var(--ink); color: var(--ink-text); border-radius: var(--radius-card);
  padding: 24px; display: flex; flex-direction: column; justify-content: center; gap: 8px;
  position: relative; overflow: hidden;
}
.sol-gain::before { content: ""; position: absolute; inset: auto 0 0 0; height: 3px; background: var(--grad); }
.sol-gain-vip { background: linear-gradient(160deg, #1a1426, #121317); }
.sol-gain-vip::before { background: linear-gradient(90deg, var(--accent), var(--gold)); }
.gain-label { font-size: 12px; color: var(--ink-dim); letter-spacing: 1px; }
.sol-gain b { font-family: var(--font-num); font-size: 42px; font-weight: 900; }
.sol-gain b {
  background: linear-gradient(135deg, var(--primary), var(--gold));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.sol-gain-vip b { background: linear-gradient(135deg, var(--accent), var(--gold)); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.sol-gain p { font-size: 12px; color: var(--ink-dim); line-height: 1.5; }
/* M8 3D 微倾：仅桌面 */
@media (pointer: fine) and (min-width: 769px) {
  .sol-card.tilt { transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease; }
}

/* ---------- ④ 能力与数据 ---------- */
.ability-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px;
  margin-bottom: 56px;
}
.ability {
  background: var(--ink-card); border: 1px solid var(--ink-line); border-radius: var(--radius-card);
  padding: 18px; display: flex; flex-direction: column; gap: 6px;
  transition: transform .2s ease, border-color .2s ease;
}
.ability:hover { transform: translateY(-4px); border-color: rgba(170,255,75,.4); }
.ability-icon { width: 34px; height: 34px; border-radius: 10px; background: rgba(255,107,53,.16); border: 1px solid rgba(255,107,53,.35); }
.ability b { font-size: 15px; color: var(--ink-text); }
.ability i { font-size: 12px; color: var(--ink-dim); font-style: normal; }

.data-row {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px;
  position: relative;
}
.data-cell {
  background: var(--ink-card); border: 1px solid var(--ink-line); border-radius: var(--radius-card);
  padding: 28px 20px; text-align: center; position: relative; overflow: hidden;
}
.data-num { font-family: var(--font-num); font-size: 34px; font-weight: 900; display: block; margin-bottom: 6px; }
.data-num {
  background: linear-gradient(135deg, var(--primary), var(--gold));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.data-cell p { color: var(--ink-text); font-size: 14px; margin-bottom: 8px; }
.data-src { color: var(--ink-dim); font-size: 11px; }
.data-footnote { margin-top: 20px; text-align: center; font-size: 12px; color: var(--ink-dim); }

/* M11 微光扫过（data-cell / compliance-badge 共用） */
.shimmer::before {
  content: ""; position: absolute; top: 0; left: 0; height: 100%; width: 40%;
  background: linear-gradient(105deg, transparent, rgba(255,255,255,.10) 50%, transparent);
  transform: translateX(-120%) skewX(-12deg);
  animation: shimmer 1.5s ease-in-out infinite;
}
@keyframes shimmer {
  0% { transform: translateX(-120%) skewX(-12deg); }
  60%, 100% { transform: translateX(320%) skewX(-12deg); }
}
/* 荧光绿数据描边（M11 点缀） */
.data-cell .data-num { text-shadow: 0 0 22px rgba(170,255,75,.10); }

/* ---------- ⑤ 合作流程 ---------- */
.flow-steps {
  position: relative; display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px;
  counter-reset: step;
}
.flow-step {
  position: relative; background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius-card); padding: 28px 20px 22px; text-align: center;
  box-shadow: var(--shadow-card); transition: transform .2s ease, box-shadow .2s ease;
}
.flow-step:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.flow-step h3 { font-size: 16px; font-weight: 800; margin-bottom: 8px; }
.flow-step p { font-size: 13px; color: var(--muted); line-height: 1.6; }
.flow-node {
  width: 40px; height: 40px; margin: 0 auto 12px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  background: var(--bg); color: var(--muted); border: 2px solid var(--line);
  font-weight: 800; transition: all .4s ease;
}
.flow-line { position: absolute; top: 34px; left: 10%; right: 10%; height: 3px; background: var(--line); border-radius: 2px; z-index: 0; overflow: hidden; }
.flow-line i {
  display: block; height: 100%; width: 0;
  background: linear-gradient(90deg, var(--primary), var(--gold)); border-radius: 2px;
  transition: width .4s ease;
}
/* M12 步骤依次点亮（observer 触发 .lit，transition-delay 错峰） */
.flow-steps.lit .flow-line i { width: 100%; }
.flow-step.lit .flow-node {
  background: var(--grad); color: #fff; border-color: var(--gold);
  box-shadow: 0 0 16px rgba(255,184,0,.5);
}
.flow-step.lit h3 { color: var(--primary); }
.flow-step:nth-child(1) { transition-delay: 0s; }
.flow-step:nth-child(2) { transition-delay: .1s; }
.flow-step:nth-child(3) { transition-delay: .2s; }
.flow-step:nth-child(4) { transition-delay: .3s; }
.flow-step:nth-child(5) { transition-delay: .4s; }

/* ---------- ⑥ 资质合规与隐私 ---------- */
.badge-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-bottom: 32px; } /* 6 徽章：3+3 排布（v1.2 +主体资质营业执照） */
.compliance-badge {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius-card);
  padding: 24px; box-shadow: var(--shadow-card); position: relative; overflow: hidden;
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.compliance-badge:hover { transform: translateY(-4px); border-color: var(--gold); box-shadow: var(--shadow-hover); }
.cb-icon {
  width: 44px; height: 44px; border-radius: 14px; margin-bottom: 14px;
  display: flex; align-items: center; justify-content: center;
  background: rgba(0,191,165,.12); border: 1px solid rgba(0,191,165,.3);
  color: var(--success); font-weight: 800; font-size: 16px;
}
.compliance-badge h3 { font-size: 16px; font-weight: 800; margin-bottom: 8px; }
.compliance-badge p { font-size: 13px; color: var(--muted); margin-bottom: 10px; }
.compliant-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.compliant-card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius-card);
  padding: 24px; box-shadow: var(--shadow-card);
}
.compliant-card h3 { font-size: 16px; font-weight: 800; margin-bottom: 10px; }
.compliant-card p { font-size: 14px; color: var(--muted); }
.compliant-card b { color: var(--title); }

/* ⑥-a 第六徽章 · 主体资质营业执照（金色变体，v1.2：6 徽章 3+3 网格） */
.cb-icon.cb-gold {
  background: rgba(255,184,0,.14);
  border: 1px solid rgba(255,184,0,.35);
  color: #B8860B;
}
.compliance-badge p b { color: var(--title); font-weight: 700; } /* 信用代码 <b> 高亮为标题色 */

/* ⑥-b 备案主体信息公示（#license：widen 白卡 + DL 双列网格 + 经营范围核验小字） */
.compliant-wide { grid-column: 1 / -1; }
.license-intro { margin: 0 0 16px; }
.license-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px 40px;
  margin: 0 0 4px;
}
.license-item dt { font-size: 12px; color: var(--muted); letter-spacing: .4px; margin-bottom: 4px; }
.license-item dd { font-size: 15px; font-weight: 700; color: var(--title); line-height: 1.5; }
.license-note { font-size: 13px; color: var(--muted); line-height: 1.7; margin-top: 12px; }
.license-note b { color: var(--title); font-weight: 700; }

/* ---------- ⑦ 加入我们 ---------- */
.section-join { padding: 120px 0; }
.join-wrap {
  display: grid; grid-template-columns: 1.05fr .95fr; gap: 48px; align-items: start;
  background: var(--ink-card); border: 1px solid var(--ink-line); border-radius: var(--radius-lg);
  padding: 48px; box-shadow: var(--shadow-dark);
  position: relative; overflow: hidden;
}
/* M14 表单卡片入场光晕 */
.join-wrap::before {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(600px 300px at 80% -20%, rgba(255,107,53,.18), transparent 70%);
  opacity: 0; transition: opacity .6s ease;
  pointer-events: none;
}
.join-wrap.glow::before { opacity: 1; }
.join-copy h2 { font-size: 38px; font-weight: 900; color: var(--ink-text); margin-bottom: 18px; }
.join-copy h2 em { background: linear-gradient(135deg, var(--primary), var(--gold)); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.join-copy > p { color: var(--ink-dim); font-size: 15px; margin-bottom: 20px; }
.join-copy b { color: var(--gold); }
.join-points { display: grid; gap: 12px; }
.join-points li {
  color: var(--ink-text); font-size: 14px; padding-left: 22px; position: relative;
}
.join-points li::before { content: "✓"; position: absolute; left: 0; color: var(--neon); font-weight: 800; }
.join-form { display: grid; gap: 18px; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.field { display: grid; gap: 6px; }
.field span { font-size: 13px; color: var(--ink-dim); }
.field span em { color: var(--primary); font-style: normal; }
.field input, .field select, .field textarea {
  width: 100%; min-height: 44px; padding: 10px 14px;
  background: rgba(255,255,255,.06); border: 1px solid var(--ink-line);
  border-radius: var(--radius-md); color: var(--ink-text); font-size: 15px; font-family: inherit;
  transition: border-color .2s ease, background .2s ease;
}
.field textarea { resize: vertical; min-height: 84px; }
.field input::placeholder, .field textarea::placeholder { color: #5c626b; }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--primary); background: rgba(255,107,53,.07);
}
.field select { appearance: none; background-image: linear-gradient(45deg, transparent 50%, var(--gold) 50%), linear-gradient(135deg, var(--gold) 50%, transparent 50%); background-position: calc(100% - 20px) calc(50% - 2px), calc(100% - 15px) calc(50% - 2px); background-size: 5px 5px; background-repeat: no-repeat; }
.field select option { color: var(--title); }
.field-full { grid-column: 1 / -1; }
.form-privacy { font-size: 12px; color: var(--ink-dim); }
.form-status { font-size: 14px; min-height: 22px; color: var(--success); font-weight: 600; }
.form-status.error { color: #ff6b6b; }

/* ---------- 页脚 ---------- */
.footer {
  background: #0d0e11; color: var(--ink-dim);
  padding: 56px 0 40px; border-top: 1px solid var(--ink-line); font-size: 13px;
}
.footer-grid { display: grid; grid-template-columns: 1.2fr 1fr 1.6fr; gap: 32px; margin-bottom: 32px; }
.footer-brand .brand { color: var(--ink-text); margin-bottom: 10px; }
.footer-brand p { line-height: 1.7; }
.footer-nav { display: grid; grid-template-columns: 1fr 1fr; align-content: start; gap: 8px; }
.footer-nav a { color: var(--ink-dim); padding: 4px 0; transition: color .2s ease; }
.footer-nav a:hover { color: var(--gold); }
.footer-legal, .footer-legal b { color: var(--ink-dim); }
.footer-legal p { margin-bottom: 8px; line-height: 1.7; }
.footer-legal strong { color: var(--gold); }
.footer-icp {
  display: flex; flex-wrap: wrap; gap: 8px 24px; align-items: center;
  border-top: 1px solid var(--ink-line); padding-top: 20px; margin-bottom: 12px;
}
.footer-icp a { color: var(--ink-dim); }
.footer-icp a b { color: var(--ink-text); }
.footer-contact { line-height: 1.7; margin-bottom: 8px; }
.footer-contact b { color: var(--ink-text); }
.footer-note { font-size: 12px; color: #565b64; line-height: 1.7; }

/* ---------- 悬浮条 ---------- */
.floatbar {
  position: fixed; right: 20px; bottom: 24px; z-index: 80;
  display: flex; flex-direction: column; gap: 10px; align-items: flex-end;
}
.float-to-top {
  width: 44px; height: 44px; border-radius: 50%;
  background: rgba(18,19,23,.85); border: 1px solid var(--ink-line); color: var(--ink-text);
  cursor: pointer; font-size: 18px;
  opacity: 0; transform: translateY(8px); pointer-events: none;
  transition: opacity .25s ease, transform .25s ease;
}
.float-to-top.show { opacity: 1; transform: translateY(0); pointer-events: auto; }
.float-to-top:hover { background: var(--primary); color: #fff; }

/* ---------- 滚动出场（M6/M10/M12/M14 通用触发） ---------- */
.in-view { animation: riseIn .6s ease forwards; }

/* ---------- G1 全局动效兜底 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001s !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001s !important;
  }
  .reveal { opacity: 1; transform: none; }
  .hero-particles, .shimmer::before { display: none; }
  .stat dd b, .data-num, .sol-gain b { -webkit-text-fill-color: currentColor; background: none; color: var(--gold); }
  .hero-title em { -webkit-text-fill-color: currentColor; background: none; color: #fff; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .system-grid { grid-template-columns: repeat(2, 1fr); }
  .grid-tools { grid-template-columns: repeat(3, 1fr); }
  .data-row { grid-template-columns: repeat(2, 1fr); }
  .ability-grid { grid-template-columns: repeat(4, 1fr); }
  .sol-card { grid-template-columns: 1fr 200px; }
}

@media (max-width: 768px) {
  :root { --top-h: 28px; --nav-h: 58px; }
  .section { padding: 64px 0; }
  .container { padding: 0 16px; }
  .nav-links { display: none; }
  .nav-burger { display: flex; }
  .nav-cta { display: none; }
  .brand-sub { display: none; }

  .hero { padding-top: calc(var(--top-h) + var(--nav-h) + 56px); padding-bottom: 72px; min-height: auto; }
  .hero-inner { grid-template-columns: 1fr; gap: 32px; }
  .hero-title { font-size: clamp(34px, 11vw, 40px); }
  .hero-sub { font-size: 15px; }
  .hero-cta { flex-direction: column; }
  .hero-cta .btn { width: 100%; }

  .section-head h2 { font-size: 30px; }
  .system-grid { grid-template-columns: 1fr 1fr; gap: 14px; }
  .grid-tools { grid-template-columns: 1fr; }
  .tile { padding: 18px; }
  .tile-desc { min-height: 0; }

  .sol-card { grid-template-columns: 1fr; padding: 22px; }
  .sol-gain { padding: 18px; }
  .sol-gain b { font-size: 32px; }
  .sol-grid { grid-template-columns: 1fr; gap: 16px; }

  .ability-grid { grid-template-columns: repeat(2, 1fr); }
  .data-row { grid-template-columns: 1fr 1fr; gap: 14px; }

  .flow-steps { grid-template-columns: 1fr 1fr; }
  .flow-step:nth-child(5) { grid-column: 1 / -1; }
  .flow-line { display: none; }

  .badge-grid { grid-template-columns: 1fr 1fr; gap: 14px; }
  .compliant-grid { grid-template-columns: 1fr; }
  .license-grid { grid-template-columns: 1fr; } /* DL 公示区移动端降单列 */

  .join-wrap { grid-template-columns: 1fr; padding: 28px 20px; }
  .form-grid { grid-template-columns: 1fr; }
  .join-copy h2 { font-size: 30px; }

  .footer-grid { grid-template-columns: 1fr; gap: 24px; }

  .floatbar { right: 14px; bottom: 16px; }
  .float-to-top { display: none; } /* 移动端隐藏返回顶部 */
  .float-apply { min-height: 44px; }
}

@media (max-width: 420px) {
  .system-grid { grid-template-columns: 1fr; }
  .badge-grid { grid-template-columns: 1fr; }
  .data-row { grid-template-columns: 1fr; }
}
/* ═══════════════════════════════════════════════════════════════
   ⚙️ ③ 星媒引擎「知缘生态的 AI 底座」（v1.1 新增 · 深色反插段）
   M15 四卡错峰上浮 / M16 关系连线点亮 / M17 对外价值条金带微扫
   ═══════════════════════════════════════════════════════════════ */
.section-engine {
  background:
    radial-gradient(1000px 500px at 20% 0%, rgba(255,107,53,0.10), transparent 55%),
    radial-gradient(900px 480px at 85% 100%, rgba(124,77,255,0.08), transparent 60%),
    var(--ink);
  color: var(--ink-text);
}
.section-engine .section-head h2 { color: var(--ink-text); }
.section-engine .section-head h2 em { color: var(--neon); background: none; }
.section-engine .section-lead { color: var(--ink-dim); }
.section-engine .section-lead b { color: var(--gold); }

/* ② 业务全景块尾：引擎出处注脚（v1.1 §6） */
.system-tools-note {
  margin-top: 18px; padding: 12px 16px; font-size: 13px; color: var(--ink-dim);
  background: rgba(255,107,53,0.06); border: 1px dashed rgba(255,184,0,0.35);
  border-radius: var(--radius-md); line-height: 1.8;
}
.system-tools-note b { color: var(--gold); }

/* 能力四卡（M15） */
.engine-cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.e-card {
  position: relative; background: var(--ink-card); border: 1px solid var(--ink-line);
  border-radius: var(--radius-card); padding: 24px; color: var(--ink-text);
  box-shadow: var(--shadow-dark); display: flex; flex-direction: column; gap: 10px;
  transition: transform .25s ease, border-color .25s ease, box-shadow .25s ease;
}
.e-card:hover { transform: translateY(-6px); border-color: rgba(170,255,75,0.55); box-shadow: 0 16px 40px rgba(170,255,75,0.14); }
.e-icon {
  width: 44px; height: 44px; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 15px; color: #fff;
  background: linear-gradient(135deg, #FF6B35, #FFB800);
  box-shadow: 0 0 14px rgba(170,255,75,0.25);
}
.e-card h3 { font-size: 17px; font-weight: 800; }
.e-card p { font-size: 13px; color: var(--ink-dim); line-height: 1.7; min-height: 72px; }
.e-tag { display: inline-block; align-self: flex-start; padding: 2px 10px; border-radius: 999px; font-size: 12px; font-weight: 600; }
.e-tag-done { background: rgba(0,191,165,.14); color: var(--success); }   /* 已落地 */
.e-tag-saas { background: rgba(124,77,255,.16); color: #A78BFA; }         /* 可独立交付 */
.e-mech { font-style: normal; font-size: 12px; color: var(--ink-dim); border-top: 1px dashed var(--ink-line); padding-top: 8px; line-height: 1.6; }

/* 关系区（老梁核心诉求 · §7.3） */
.engine-relation { margin-top: 64px; }
.relation-head { text-align: center; max-width: 780px; margin: 0 auto 40px; }
.relation-head h3 { font-size: 30px; font-weight: 800; color: var(--ink-text); margin-bottom: 12px; }
.relation-head h3 em { color: var(--gold); }
.relation-head p { font-size: 15px; color: var(--ink-dim); }

.relation-map {
  position: relative; max-width: 980px; margin: 0 auto;
  display: grid; grid-template-columns: 1fr 1.3fr 1fr; grid-template-rows: 1fr 1fr;
  gap: 14px; align-items: stretch;
}
.rel-line { position: absolute; background: linear-gradient(90deg, transparent, var(--neon), transparent); opacity: 0; z-index: 0; }
.rel-line-v { top: 0; bottom: 0; left: 50%; width: 2px; margin-left: -1px; background: linear-gradient(180deg, transparent, var(--neon), transparent); }
.rel-line-h { left: 0; right: 0; top: 50%; height: 2px; margin-top: -1px; }
#relationMap.lit .rel-line-v { animation: relSparkV 1.1s ease .15s forwards; }
#relationMap.lit .rel-line-h { animation: relSparkH 1.1s ease .45s forwards; }
@keyframes relSparkV { 0% { opacity: 0; transform: scaleY(0); } 45% { opacity: .9; } 100% { opacity: .5; transform: scaleY(1); } }
@keyframes relSparkH { 0% { opacity: 0; transform: scaleX(0); } 45% { opacity: .9; } 100% { opacity: .5; transform: scaleX(1); } }

.rel-engine {
  grid-area: 1 / 2 / 3 / 3; align-self: center; justify-self: center; text-align: center;
  width: 100%; height: 100%; max-height: 150px;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 4px;
  background: var(--ink-card); border: 1px solid rgba(170,255,75,0.4); border-radius: var(--radius-lg);
  color: var(--ink-text); font-weight: 800; font-size: 20px; box-shadow: 0 0 26px rgba(170,255,75,0.12);
  z-index: 1;
}
.rel-engine small { font-size: 12px; color: var(--neon); font-weight: 600; line-height: 1.6; }
.rel-scene {
  background: var(--ink-card); border: 1px solid var(--ink-line); border-radius: var(--radius-card);
  padding: 16px 18px; display: flex; flex-direction: column; gap: 6px; z-index: 1;
  transition: border-color .2s ease, transform .2s ease;
}
.rel-scene:hover { border-color: var(--gold); transform: translateY(-3px); }
.rel-scene b { font-size: 14px; color: var(--ink-text); }
.rel-scene span { font-size: 12px; color: var(--ink-dim); line-height: 1.6; }
.rel-scene-1 { grid-area: 1 / 1; }
.rel-scene-2 { grid-area: 1 / 3; }
.rel-scene-3 { grid-area: 2 / 1; }
.rel-scene-4 { grid-area: 2 / 3; }
.relation-slogan { text-align: center; margin-top: 32px; font-size: 17px; color: var(--gold); font-weight: 700; }

/* 对外价值条（M17 金带微扫） */
.engine-external {
  margin-top: 48px; display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap;
  background: linear-gradient(135deg, rgba(255,184,0,0.10), rgba(255,107,53,0.06));
  border: 1px solid rgba(255,184,0,0.35); border-radius: var(--radius-lg);
  padding: 20px 24px; position: relative; overflow: hidden; color: var(--ink-text); z-index: 1;
}
.engine-external p { font-size: 14px; color: var(--ink-dim); line-height: 1.7; max-width: 840px; }
.engine-external p b { color: var(--gold); }
.shimmer-gold::before {
  content: ""; position: absolute; top: 0; left: 0; height: 100%; width: 34%;
  background: linear-gradient(105deg, transparent, rgba(255,184,0,0.20) 50%, transparent);
  transform: translateX(-120%) skewX(-12deg); animation: shimmer 1.5s ease-in-out infinite;
}

/* AI 内容合规声明（§7.5） */
.engine-compliance {
  margin-top: 36px; padding: 16px 20px; border: 1px dashed rgba(255,255,255,0.14);
  border-radius: var(--radius-md);
}
.engine-compliance h4 { font-size: 13px; color: var(--gold); margin-bottom: 10px; font-weight: 800; }
.engine-compliance li { font-size: 12px; color: var(--ink-dim); line-height: 1.8; padding-left: 14px; position: relative; }
.engine-compliance li::before { content: "·"; position: absolute; left: 0; color: var(--neon); }

/* ⑧ 表单旁合规（B 方案承接） */
.form-age { font-size: 12px; color: var(--ink-dim); line-height: 1.7; margin-top: 4px; }
.form-age strong { color: var(--gold); }
.link-inline { color: var(--info); text-decoration: underline; }

/* 页脚隐私要点（#privacy 完整化） */
.footer-privacy { border-top: 1px solid var(--ink-line); padding: 18px 0 12px; }
.footer-privacy h4 { font-size: 14px; color: var(--ink-text); font-weight: 800; margin-bottom: 10px; }
.footer-privacy li { font-size: 12.5px; color: var(--ink-dim); line-height: 1.8; padding-left: 14px; position: relative; }
.footer-privacy li::before { content: "·"; position: absolute; left: 0; color: var(--gold); }
.footer-privacy li b { color: var(--ink-text); }
.privacy-pending { font-size: 12px; color: #565b64; margin-top: 8px; }

/* ---------- 引擎区响应式 ---------- */
@media (max-width: 1024px) {
  .engine-cards { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .engine-cards { grid-template-columns: 1fr 1fr; gap: 14px; }
  .e-card:hover { transform: none; }
  .e-card p { min-height: 0; }
  .relation-map { display: flex; flex-direction: column; gap: 12px; }  /* 连线动效不可用时信息不丢（纵向四行） */
  .rel-line { display: none; }
  .rel-engine { max-height: none; height: auto; padding: 18px; }
  .relation-head h3 { font-size: 24px; }
  .relation-head h3 em { font-size: 24px; }
  .engine-external { padding: 16px; }
}
@media (max-width: 420px) {
  .engine-cards { grid-template-columns: 1fr; }
}

/* ---------- G1 兜底：引擎区动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .rel-line { opacity: .45; animation: none !important; }
  .shimmer-gold::before { display: none; }
  .e-card, .rel-scene { transition: none; }
}

/* M15 引擎四卡错峰上浮（300ms stagger） */
.engine-cards .e-card:nth-child(1).in-view { animation-delay: 0s; }
.engine-cards .e-card:nth-child(2).in-view { animation-delay: .06s; }
.engine-cards .e-card:nth-child(3).in-view { animation-delay: .12s; }
.engine-cards .e-card:nth-child(4).in-view { animation-delay: .18s; }