/* ============================================================
   WEEKUAI 官网设计系统
   深空墨蓝 × 蓝青渐变 · 高级 B2B 科技感
   ============================================================ */

:root {
  /* 色彩令牌 */
  --ink: #0A0E1A;
  --ink-2: #070B14;
  --surface-dark: #10182B;
  --surface-dark-2: #141D33;
  --light: #F6F8FB;
  --white: #FFFFFF;
  --text: #0B1220;
  --body: #3E4C61;
  --muted: #66748A;
  --on-dark: #F2F6FC;
  --on-dark-muted: #8E9BB3;
  --line: #E4EAF3;
  --line-dark: rgba(148, 163, 184, .16);
  --blue: #2E6BFF;
  --blue-deep: #1D4ED8;
  --cyan: #22D3EE;
  --blue-soft: rgba(46, 107, 255, .09);
  --grad: linear-gradient(120deg, #2E6BFF 0%, #22D3EE 100%);
  --grad-text: linear-gradient(100deg, #5B8CFF 0%, #38DFFF 100%);

  /* 圆角 / 阴影 */
  --r-lg: 18px;
  --r-md: 12px;
  --r-sm: 8px;
  --r-pill: 999px;
  --shadow-card: 0 10px 30px -12px rgba(15, 23, 42, .12);
  --shadow-pop: 0 24px 60px -18px rgba(46, 107, 255, .38);
  --shadow-dark: 0 20px 50px -20px rgba(0, 0, 0, .55);

  /* 字体 */
  --font-sans: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Cascadia Code", Menlo, Consolas, monospace;

  /* 节奏 */
  --container: 1200px;
  --sec-y: 104px;
}

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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.75;
  color: var(--body);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input, select, textarea { font-family: inherit; }

::selection { background: rgba(46, 107, 255, .22); }

.container { max-width: var(--container); margin: 0 auto; padding: 0 28px; }

/* ---------- 排版 ---------- */
h1, h2, h3, h4 { color: var(--text); font-weight: 700; line-height: 1.28; letter-spacing: .01em; }

.h1 { font-size: clamp(38px, 4.6vw, 60px); font-weight: 900; }
.h2 { font-size: clamp(28px, 3.2vw, 42px); font-weight: 800; }
.h3 { font-size: 22px; font-weight: 700; }
.lead { font-size: clamp(16px, 1.4vw, 19px); }

/* 等宽英文小标签（眉题） */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: .28em;
  text-transform: uppercase;
  color: var(--blue);
}
.eyebrow::before {
  content: "";
  width: 22px; height: 1px;
  background: var(--grad);
}
.eyebrow.on-dark { color: var(--cyan); }

.section { padding: var(--sec-y) 0; }
.section--light { background: var(--light); }
.section--dark { background: var(--ink); }

.sec-head { max-width: 720px; margin-bottom: 56px; }
.sec-head .eyebrow { margin-bottom: 18px; }
.sec-head .h2 { margin-bottom: 14px; }
.sec-head p { color: var(--muted); font-size: 17px; }
.sec-head--center { margin-left: auto; margin-right: auto; text-align: center; }
.sec-head--center .eyebrow::before { display: none; }
.sec-head--center .eyebrow::after,
.sec-head--center .eyebrow::before { content: none; }
.sec-head--center .eyebrow {
  gap: 14px;
}
.sec-head--center .eyebrow span { position: relative; }

/* 居中眉题左右短线 */
.sec-head--center .eyebrow {
  justify-content: center;
}
.sec-head--center .eyebrow::before,
.sec-head--center .eyebrow::after {
  content: "";
  display: block;
  width: 22px; height: 1px;
  background: var(--grad);
}

/* 暗色区排版 */
.on-dark .h2, .section--dark .h2 { color: var(--on-dark); }
.on-dark p, .section--dark p:not(.metric) { color: var(--on-dark-muted); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 14px 30px;
  border-radius: var(--r-pill);
  font-size: 16px;
  font-weight: 600;
  line-height: 1;
  transition: transform .25s ease, box-shadow .25s ease, background .25s ease, border-color .25s ease;
  white-space: nowrap;
}
.btn svg { width: 17px; height: 17px; }

.btn--primary {
  color: #fff;
  background: var(--grad);
  box-shadow: var(--shadow-pop);
}
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 30px 70px -18px rgba(46, 107, 255, .5); }

.btn--ghost {
  color: var(--on-dark);
  border: 1px solid rgba(255, 255, 255, .28);
  background: rgba(255, 255, 255, .04);
  backdrop-filter: blur(6px);
}
.btn--ghost:hover { border-color: rgba(255, 255, 255, .55); background: rgba(255, 255, 255, .09); transform: translateY(-2px); }

.btn--ghost-light {
  color: var(--text);
  border: 1px solid var(--line);
  background: #fff;
}
.btn--ghost-light:hover { border-color: var(--blue); color: var(--blue); transform: translateY(-2px); }

.btn--lg { padding: 17px 40px; font-size: 17px; }

/* 文字链接 */
.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--blue);
  font-size: 15.5px;
  font-weight: 600;
}
.link-arrow svg { width: 15px; height: 15px; transition: transform .25s ease; }
.link-arrow:hover svg { transform: translateX(4px); }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  height: 72px;
  background: rgba(7, 11, 20, .68);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--line-dark);
  transition: background .3s ease, box-shadow .3s ease;
}
.site-header.scrolled {
  background: rgba(7, 11, 20, .88);
  box-shadow: 0 12px 40px -16px rgba(0, 0, 0, .6);
}
.site-header .container {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.brand { display: inline-flex; align-items: center; gap: 11px; flex-shrink: 0; }
.brand-mark {
  width: 34px; height: 34px;
  border-radius: 9px;
  background: var(--grad);
  box-shadow: 0 6px 18px -6px rgba(46, 107, 255, .55);
  display: grid; place-items: center;
  color: #fff;
  font-weight: 800;
  font-size: 16px;
  letter-spacing: -.02em;
}
.brand-name {
  color: #fff;
  font-size: 19px;
  font-weight: 800;
  letter-spacing: .06em;
}
.brand-name small {
  display: block;
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 500;
  letter-spacing: .34em;
  color: var(--on-dark-muted);
  margin-top: 1px;
}

.main-nav { display: flex; align-items: center; gap: 6px; }
.main-nav a {
  padding: 9px 16px;
  border-radius: var(--r-pill);
  color: var(--on-dark-muted);
  font-size: 15.5px;
  font-weight: 500;
  transition: color .2s ease, background .2s ease;
}
.main-nav a:hover { color: #fff; background: rgba(255, 255, 255, .07); }
.main-nav a.active { color: #fff; background: rgba(46, 107, 255, .22); }

.header-cta { flex-shrink: 0; }
.header-cta .btn { padding: 11px 24px; font-size: 15px; }

.nav-toggle {
  display: none;
  width: 42px; height: 42px;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, .18);
  color: #fff;
  place-items: center;
}
.nav-toggle svg { width: 20px; height: 20px; }

/* ---------- 首屏 ---------- */
.hero {
  position: relative;
  background: var(--ink);
  padding: 200px 0 110px;
  overflow: hidden;
}
/* 氛围光晕 */
.hero::before, .dark-glow::before {
  content: "";
  position: absolute;
  width: 720px; height: 720px;
  top: -300px; left: -220px;
  background: radial-gradient(closest-side, rgba(46, 107, 255, .22), transparent);
  pointer-events: none;
}
.hero::after {
  content: "";
  position: absolute;
  width: 640px; height: 640px;
  bottom: -280px; right: -180px;
  background: radial-gradient(closest-side, rgba(34, 211, 238, .13), transparent);
  pointer-events: none;
}
/* 细网格底纹 */
.grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(148, 163, 184, .05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 163, 184, .05) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 30%, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 30%, #000 30%, transparent 75%);
  pointer-events: none;
}

.hero .container {
  position: relative;
  display: grid;
  grid-template-columns: 1.08fr .92fr;
  align-items: center;
  gap: 48px;
}

.hero-content .eyebrow { margin-bottom: 22px; }
.hero-title {
  color: #fff;
  font-size: clamp(36px, 4.5vw, 56px);
  font-weight: 900;
  line-height: 1.24;
  letter-spacing: .01em;
  margin-bottom: 24px;
  text-wrap: balance;
}
.hero-title .nowrap { white-space: nowrap; }
.hero-title .grad {
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}
.hero-sub {
  color: var(--on-dark-muted);
  font-size: clamp(16px, 1.5vw, 19px);
  max-width: 560px;
  margin-bottom: 40px;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 16px; }

/* 发光球体视觉 */
.hero-visual { position: relative; display: grid; place-items: center; min-height: 480px; }
.globe-glow {
  position: absolute;
  width: 88%; height: 88%;
  border-radius: 50%;
  background: radial-gradient(closest-side, rgba(46, 107, 255, .3), rgba(34, 211, 238, .08) 55%, transparent 72%);
  filter: blur(6px);
}
.globe {
  position: relative;
  width: min(420px, 82%);
  aspect-ratio: 1;
  border-radius: 50%;
  box-shadow: 0 40px 120px -30px rgba(46, 107, 255, .55), inset 0 0 80px rgba(34, 211, 238, .12);
  animation: float 7s ease-in-out infinite;
}
.globe img {
  width: 100%; height: 100%;
  object-fit: cover;
  border-radius: 50%;
}
/* 环绕轨道 */
.orbit {
  position: absolute;
  border: 1px solid rgba(120, 180, 255, .22);
  border-radius: 50%;
  pointer-events: none;
}
.orbit--1 { width: 108%; height: 108%; top: -4%; left: -4%; transform: rotateX(72deg) rotateZ(0); animation: spin 26s linear infinite; }
.orbit--2 { width: 122%; height: 122%; top: -11%; left: -11%; border-color: rgba(34, 211, 238, .16); transform: rotateX(76deg) rotateZ(40deg); animation: spin 38s linear infinite reverse; }
.orbit-dot {
  position: absolute;
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 14px rgba(34, 211, 238, .9);
}
.orbit--1 .orbit-dot { top: -3px; left: calc(50% - 3.5px); }
.orbit--2 .orbit-dot { bottom: 8%; right: 6%; background: var(--blue); box-shadow: 0 0 14px rgba(46, 107, 255, .9); }

/* 漂浮粒子 */
.particle {
  position: absolute;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 12px rgba(34, 211, 238, .8);
  animation: float 6s ease-in-out infinite;
}
.particle--1 { width: 8px; height: 8px; top: 12%; left: 6%; }
.particle--2 { width: 5px; height: 5px; top: 30%; right: 2%; background: var(--blue); box-shadow: 0 0 12px rgba(46, 107, 255, .8); animation-delay: -2.4s; }
.particle--3 { width: 6px; height: 6px; bottom: 18%; left: 10%; animation-delay: -1.2s; }
.particle--4 { width: 4px; height: 4px; top: 58%; right: 8%; animation-delay: -3.6s; }

@keyframes spin { to { transform: rotateX(72deg) rotateZ(360deg); } }
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-14px); } }

/* ---------- 业务卡片（Services） ---------- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.service-card {
  position: relative;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 36px 34px 32px;
  transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease;
  overflow: hidden;
}
.service-card::after {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--grad);
  opacity: 0;
  transition: opacity .3s ease;
}
.service-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 30px 60px -24px rgba(15, 23, 42, .22);
  border-color: rgba(46, 107, 255, .38);
}
.service-card:hover::after { opacity: 1; }

.service-icon {
  width: 58px; height: 58px;
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(46, 107, 255, .14), rgba(34, 211, 238, .16));
  border: 1px solid rgba(46, 107, 255, .2);
  display: grid;
  place-items: center;
  color: var(--blue);
  margin-bottom: 24px;
}
.service-icon svg { width: 27px; height: 27px; }
.service-card .h3 { margin-bottom: 12px; font-size: 21px; }
.service-card p { color: var(--muted); font-size: 15.5px; margin-bottom: 22px; min-height: 54px; }

/* ---------- 方法论（暗色五步） ---------- */
.method-section {
  position: relative;
  background: var(--ink);
  overflow: hidden;
}
.method-section::before {
  content: "";
  position: absolute;
  width: 700px; height: 700px;
  top: -320px; right: -260px;
  background: radial-gradient(closest-side, rgba(46, 107, 255, .16), transparent);
  pointer-events: none;
}
.method-track { position: relative; }
.method-track::before {
  content: "";
  position: absolute;
  top: 27px; left: 5%; right: 5%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(34, 211, 238, .5), rgba(46, 107, 255, .5), rgba(34, 211, 238, .5), transparent);
}
.method-grid {
  position: relative;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 18px;
}
.method-step { text-align: left; }
.method-num {
  position: relative;
  z-index: 1;
  display: inline-grid;
  place-items: center;
  width: 54px; height: 54px;
  margin-bottom: 22px;
  border-radius: 50%;
  background: var(--surface-dark);
  border: 1px solid rgba(34, 211, 238, .4);
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  color: var(--cyan);
  box-shadow: 0 0 24px rgba(34, 211, 238, .18);
}
.method-step .h3 { color: var(--on-dark); font-size: 17.5px; font-weight: 700; margin-bottom: 10px; }
.method-step p { color: var(--on-dark-muted); font-size: 14px; line-height: 1.65; }

/* ---------- 数据指标 ---------- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 96px;
}
.stat { text-align: left; padding: 8px 0 8px 22px; border-left: 1px solid var(--line); }
.stat:first-child { border-left: none; padding-left: 0; }
.stat .num {
  font-family: var(--font-mono);
  font-size: clamp(36px, 3.4vw, 50px);
  font-weight: 700;
  color: var(--text);
  letter-spacing: -.02em;
  line-height: 1.1;
}
.stat .num .suffix {
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.stat .label { color: var(--muted); font-size: 15px; margin-top: 8px; }

/* ---------- 案例卡片 ---------- */
.cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.case-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 30px 28px 26px;
  display: flex;
  flex-direction: column;
  transition: transform .3s ease, box-shadow .3s ease;
}
.case-card:hover { transform: translateY(-5px); box-shadow: 0 28px 56px -24px rgba(15, 23, 42, .2); }
.case-tag {
  align-self: flex-start;
  padding: 5px 14px;
  border-radius: var(--r-pill);
  background: var(--blue-soft);
  color: var(--blue);
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 20px;
}
.case-card .h3 { font-size: 19.5px; margin-bottom: 10px; }
.case-card > p { color: var(--muted); font-size: 15px; flex: 1; }
.case-metric {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px dashed var(--line);
  color: var(--blue);
  font-weight: 700;
  font-size: 16px;
}
.case-metric svg { width: 17px; height: 17px; flex-shrink: 0; }

/* ---------- FAQ 手风琴 ---------- */
.faq-list { max-width: 860px; margin: 0 auto; display: grid; gap: 14px; }
.faq-item {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
  transition: border-color .25s ease, box-shadow .25s ease;
}
.faq-item.open { border-color: rgba(46, 107, 255, .4); box-shadow: 0 18px 44px -22px rgba(46, 107, 255, .25); }
.faq-q {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 22px 26px;
  text-align: left;
  font-size: 16.5px;
  font-weight: 600;
  color: var(--text);
}
.faq-icon {
  flex-shrink: 0;
  width: 30px; height: 30px;
  border-radius: 50%;
  border: 1px solid var(--line);
  display: grid;
  place-items: center;
  color: var(--blue);
  transition: transform .3s ease, background .3s ease, border-color .3s ease;
}
.faq-icon svg { width: 14px; height: 14px; }
.faq-item.open .faq-icon {
  transform: rotate(45deg);
  background: var(--blue);
  border-color: var(--blue);
  color: #fff;
}
.faq-a {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows .38s ease;
}
.faq-a > div { overflow: hidden; }
.faq-item.open .faq-a { grid-template-rows: 1fr; }
.faq-a p {
  padding: 0 26px 24px;
  color: var(--muted);
  font-size: 15.5px;
  line-height: 1.8;
}

/* ---------- CTA 横幅 ---------- */
.cta-band {
  position: relative;
  background: var(--ink);
  padding: 108px 0;
  text-align: center;
  overflow: hidden;
}
.cta-band::before {
  content: "";
  position: absolute;
  width: 900px; height: 480px;
  top: -220px; left: 50%;
  transform: translateX(-50%);
  background: radial-gradient(closest-side, rgba(46, 107, 255, .24), transparent);
  pointer-events: none;
}
.cta-band .container { position: relative; }
.cta-rings {
  position: absolute;
  top: 50%; right: -140px;
  transform: translateY(-50%);
  width: 460px; height: 460px;
  border-radius: 50%;
  border: 1px solid rgba(120, 180, 255, .14);
  pointer-events: none;
}
.cta-rings::before, .cta-rings::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  border: 1px solid rgba(34, 211, 238, .12);
}
.cta-rings::before { inset: 56px; }
.cta-rings::after { inset: 118px; border-color: rgba(120, 180, 255, .1); }
.cta-band .h2 { color: #fff; font-size: clamp(28px, 3.4vw, 42px); margin-bottom: 16px; }
.cta-band p { color: var(--on-dark-muted); font-size: 18px; margin-bottom: 36px; }

/* ---------- 页脚 ---------- */
.site-footer {
  background: var(--ink-2);
  padding: 76px 0 0;
  color: var(--on-dark-muted);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr 1.15fr;
  gap: 40px;
  padding-bottom: 64px;
}
.footer-brand .brand { margin-bottom: 18px; }
.footer-brand p { font-size: 14.5px; max-width: 250px; }
.footer-col h4 {
  color: var(--on-dark);
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 18px;
  letter-spacing: .04em;
}
.footer-col li { margin-bottom: 11px; }
.footer-col a {
  font-size: 14.5px;
  color: var(--on-dark-muted);
  transition: color .2s ease;
}
.footer-col a:hover { color: #fff; }
.footer-col .contact-line {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 14.5px;
  margin-bottom: 13px;
}
.footer-col .contact-line svg { width: 15px; height: 15px; color: var(--cyan); flex-shrink: 0; }
.footer-bottom {
  border-top: 1px solid var(--line-dark);
  padding: 22px 0;
}
.footer-bottom .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 13.5px;
  color: rgba(142, 155, 179, .75);
}
.footer-bottom a:hover { color: #fff; }

/* ---------- 子页面首屏 ---------- */
.page-hero {
  position: relative;
  background: var(--ink);
  padding: 168px 0 88px;
  overflow: hidden;
}
.page-hero::before {
  content: "";
  position: absolute;
  width: 640px; height: 640px;
  top: -280px; right: -200px;
  background: radial-gradient(closest-side, rgba(46, 107, 255, .2), transparent);
  pointer-events: none;
}
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 26px;
  font-size: 14px;
  color: var(--on-dark-muted);
}
.breadcrumb a { color: var(--on-dark-muted); transition: color .2s ease; }
.breadcrumb a:hover { color: #fff; }
.breadcrumb .sep { opacity: .5; }
.page-hero .eyebrow { margin-bottom: 20px; }
.page-hero h1 {
  color: #fff;
  font-size: clamp(32px, 4vw, 50px);
  font-weight: 900;
  line-height: 1.24;
  margin-bottom: 20px;
  max-width: 720px;
}
.page-hero .page-sub {
  color: var(--on-dark-muted);
  font-size: clamp(16px, 1.4vw, 18.5px);
  max-width: 640px;
  margin-bottom: 36px;
}

/* ---------- 通用内容组件 ---------- */
/* 特性卡片 */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.feature-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 30px 28px;
  transition: transform .3s ease, box-shadow .3s ease;
}
.feature-card:hover { transform: translateY(-4px); box-shadow: 0 24px 50px -22px rgba(15, 23, 42, .18); }
.feature-card .service-icon { width: 50px; height: 50px; margin-bottom: 20px; }
.feature-card .service-icon svg { width: 24px; height: 24px; }
.feature-card .h3 { font-size: 18.5px; margin-bottom: 10px; }
.feature-card p { color: var(--muted); font-size: 15px; line-height: 1.7; }

/* 图文分栏 */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.split-media {
  position: relative;
  border-radius: var(--r-lg);
  overflow: hidden;
  box-shadow: 0 34px 80px -30px rgba(15, 23, 42, .35);
  aspect-ratio: 4 / 3;
}
.split-media img { width: 100%; height: 100%; object-fit: cover; }
.split-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(160deg, rgba(10, 14, 26, 0) 55%, rgba(10, 14, 26, .35));
}
.split-body .eyebrow { margin-bottom: 16px; }
.split-body .h2 { font-size: clamp(24px, 2.6vw, 34px); margin-bottom: 16px; }
.split-body > p { color: var(--muted); margin-bottom: 12px; font-size: 16px; }
.check-list { margin-top: 26px; display: grid; gap: 14px; }
.check-list li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  font-size: 15.5px;
  color: var(--body);
}
.check-list .check {
  flex-shrink: 0;
  width: 22px; height: 22px;
  margin-top: 2px;
  border-radius: 50%;
  background: var(--blue-soft);
  color: var(--blue);
  display: grid;
  place-items: center;
}
.check-list .check svg { width: 12px; height: 12px; }

/* 对比表 */
.compare-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}
.compare-table th, .compare-table td {
  padding: 18px 24px;
  text-align: left;
  font-size: 15px;
  border-bottom: 1px solid var(--line);
}
.compare-table th {
  background: var(--light);
  color: var(--text);
  font-weight: 700;
  font-size: 15.5px;
}
.compare-table tr:last-child td { border-bottom: none; }
.compare-table td:first-child { color: var(--text); font-weight: 600; white-space: nowrap; }
.compare-table td { color: var(--muted); }

/* 流程步骤（横向） */
.process-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  counter-reset: step;
}
.process-grid--5 { grid-template-columns: repeat(5, 1fr); }
.stats-grid--3 { grid-template-columns: repeat(3, 1fr); margin-bottom: 0; }
.process-step {
  position: relative;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 26px 24px;
  transition: transform .3s ease, box-shadow .3s ease;
}
.process-step:hover { transform: translateY(-4px); box-shadow: 0 24px 50px -22px rgba(15, 23, 42, .18); }
.process-step .step-no {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--blue);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
}
.process-step .step-no::after {
  content: "";
  width: 26px; height: 1px;
  background: var(--grad);
}
.process-step .h3 { font-size: 17px; margin-bottom: 8px; }
.process-step p { color: var(--muted); font-size: 14.5px; line-height: 1.7; }

/* 时间线 */
.timeline { position: relative; padding-left: 34px; }
.timeline::before {
  content: "";
  position: absolute;
  left: 7px; top: 6px; bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--blue), var(--cyan));
  border-radius: 2px;
  opacity: .35;
}
.timeline li { position: relative; padding-bottom: 34px; }
.timeline li:last-child { padding-bottom: 0; }
.timeline li::before {
  content: "";
  position: absolute;
  left: -33px; top: 7px;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--white);
  border: 3px solid var(--blue);
  box-shadow: 0 0 0 4px rgba(46, 107, 255, .14);
}
.timeline .year {
  font-family: var(--font-mono);
  color: var(--blue);
  font-weight: 700;
  font-size: 15px;
  margin-bottom: 4px;
}
.timeline .h3 { font-size: 18px; margin-bottom: 6px; }
.timeline p { color: var(--muted); font-size: 15px; }

/* ---------- 表单 ---------- */
.form-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 44px;
  box-shadow: var(--shadow-card);
}
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px 22px;
}
.form-field { display: grid; gap: 8px; }
.form-field--full { grid-column: 1 / -1; }
.form-field label {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
}
.form-field label em { color: var(--blue); font-style: normal; margin-left: 3px; }
.form-field input, .form-field select, .form-field textarea {
  padding: 13px 16px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  font-size: 15px;
  color: var(--text);
  background: var(--light);
  transition: border-color .2s ease, box-shadow .2s ease, background .2s ease;
  width: 100%;
}
.form-field textarea { min-height: 120px; resize: vertical; }
.form-field input:focus, .form-field select:focus, .form-field textarea:focus {
  outline: none;
  border-color: var(--blue);
  background: #fff;
  box-shadow: 0 0 0 4px rgba(46, 107, 255, .12);
}
.form-field input.invalid, .form-field textarea.invalid { border-color: #E5484D; box-shadow: 0 0 0 4px rgba(229, 72, 77, .1); }
.form-note { grid-column: 1 / -1; font-size: 13px; color: var(--muted); }
.form-success {
  text-align: center;
  padding: 56px 24px;
}
.form-success .success-icon {
  width: 68px; height: 68px;
  margin: 0 auto 22px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(46, 107, 255, .12), rgba(34, 211, 238, .14));
  display: grid;
  place-items: center;
  color: var(--blue);
}
.form-success .success-icon svg { width: 30px; height: 30px; }

/* ---------- 联系信息卡 ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  margin-top: 56px;
}
.contact-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 30px 28px;
  text-align: left;
  transition: transform .3s ease, box-shadow .3s ease;
}
.contact-card:hover { transform: translateY(-4px); box-shadow: 0 24px 50px -22px rgba(15, 23, 42, .18); }
.contact-card .service-icon { width: 48px; height: 48px; margin-bottom: 18px; }
.contact-card .service-icon svg { width: 22px; height: 22px; }
.contact-card .h3 { font-size: 17px; margin-bottom: 8px; }
.contact-card p { color: var(--muted); font-size: 15px; }

/* ---------- 洞察列表 ---------- */
.insight-grid { display: grid; gap: 18px; }
.insight-item {
  display: grid;
  grid-template-columns: 110px 1fr auto;
  gap: 28px;
  align-items: center;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 26px 30px;
  transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease;
}
.insight-item:hover {
  transform: translateY(-3px);
  box-shadow: 0 24px 50px -22px rgba(15, 23, 42, .18);
  border-color: rgba(46, 107, 255, .35);
}
.insight-meta {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--muted);
  display: grid;
  gap: 6px;
}
.insight-meta .cat {
  align-self: start;
  padding: 4px 12px;
  border-radius: var(--r-pill);
  background: var(--blue-soft);
  color: var(--blue);
  font-weight: 600;
  font-size: 12.5px;
  text-align: center;
}
.insight-body .h3 { font-size: 19px; margin-bottom: 8px; transition: color .25s ease; }
.insight-item:hover .h3 { color: var(--blue); }
.insight-body p { color: var(--muted); font-size: 15px; }

/* ---------- 动效 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity .7s cubic-bezier(.22, .61, .36, 1), transform .7s cubic-bezier(.22, .61, .36, 1);
  transition-delay: var(--d, 0s);
}
.reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
  .reveal { opacity: 1; transform: none; }
  html { scroll-behavior: auto; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  .hero .container { grid-template-columns: 1fr; gap: 24px; }
  .hero-visual { min-height: 380px; }
  .method-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
  .method-track::before { display: none; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 32px 20px; margin-bottom: 72px; }
  .stats-grid--3 { grid-template-columns: repeat(3, 1fr); gap: 32px 20px; }
  .stat:nth-child(3) { border-left: none; padding-left: 0; }
  .cases-grid { grid-template-columns: 1fr 1fr; }
  .feature-grid { grid-template-columns: 1fr 1fr; }
  .process-grid { grid-template-columns: 1fr 1fr; }
  .process-grid--5 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 900px) {
  :root { --sec-y: 72px; }
  .nav-toggle { display: grid; }
  .main-nav {
    position: fixed;
    top: 72px; left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 18px 24px 26px;
    background: rgba(7, 11, 20, .97);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--line-dark);
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    transition: transform .3s ease, opacity .3s ease, visibility .3s ease;
  }
  .main-nav.open { transform: none; opacity: 1; visibility: visible; }
  .main-nav a { padding: 13px 18px; font-size: 16px; }
  .header-cta { display: none; }
  .hero { padding: 156px 0 80px; }
  .services-grid { grid-template-columns: 1fr; }
  .split { grid-template-columns: 1fr; gap: 36px; }
  .compare-table th, .compare-table td { padding: 14px 16px; font-size: 14px; }
  .compare-table td:first-child { white-space: normal; }
  .form-card { padding: 30px 24px; }
  .form-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; margin-top: 36px; }
  .insight-item { grid-template-columns: 1fr; gap: 14px; padding: 24px; }
  .insight-meta { display: flex; gap: 12px; align-items: center; }
}

@media (max-width: 640px) {
  body { font-size: 16px; }
  .container { padding: 0 20px; }
  .hero { padding: 132px 0 64px; }
  .hero-title .nowrap { white-space: normal; }
  .hero-visual { min-height: 300px; }
  .hero-actions .btn { width: 100%; }
  .method-grid { grid-template-columns: 1fr; }
  .stats-grid, .stats-grid--3 { grid-template-columns: 1fr; gap: 24px; }
  .stat { border-left: none; padding-left: 0; border-top: 1px solid var(--line); padding-top: 20px; }
  .stat:first-child { border-top: none; padding-top: 0; }
  .cases-grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr; }
  .process-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom .container { justify-content: center; text-align: center; }
  .cta-band { padding: 80px 0; }
  .cta-rings { display: none; }
  .page-hero { padding: 140px 0 64px; }
  .btn--lg { width: 100%; }
}

/* ---------- 文章详情页（洞察「阅读」正文） ---------- */
.article-wrap { max-width: 820px; margin: 0 auto; }
.article-head { margin-bottom: 28px; }
.article-head .article-meta { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; color: var(--muted); font-size: 13.5px; margin-top: 12px; }
.article-head .cat { display: inline-block; background: #eef4ff; color: var(--blue, #3a7aff); padding: 3px 10px; border-radius: 6px; font-weight: 600; font-size: 12.5px; }
.article-body { line-height: 1.9; color: #2b3340; }
.article-body figure { margin: 26px 0; }
.article-body figure img { width: 100%; border-radius: 14px; box-shadow: 0 16px 40px rgba(11, 16, 30, .12); }
.article-body figure.article-hero img { max-height: 420px; object-fit: cover; }
.article-body figcaption { margin-top: 10px; text-align: center; color: var(--muted); font-size: 13px; }
.article-body h2 { font-size: 24px; margin: 34px 0 14px; color: #0d1b30; position: relative; padding-left: 14px; }
.article-body h2::before { content: ''; position: absolute; left: 0; top: 6px; bottom: 6px; width: 4px; border-radius: 2px; background: var(--blue, #3a7aff); }
.article-body p { margin: 14px 0; }
.article-body ul { margin: 14px 0 18px; padding-left: 4px; list-style: none; }
.article-body ul li { position: relative; padding-left: 22px; margin: 8px 0; }
.article-body ul li::before { content: ''; position: absolute; left: 2px; top: 11px; width: 7px; height: 7px; border-radius: 50%; background: var(--blue, #3a7aff); }
.article-notfound { text-align: center; padding: 60px 0; color: var(--muted); }
.article-nav { margin-top: 40px; padding-top: 22px; border-top: 1px solid var(--line); }
@media (max-width: 640px) {
  .article-body h2 { font-size: 20px; }
}