/* ==========================================================================
   梯木科技 官网样式表
   风格：明亮专业（靛蓝 + 亮蓝点缀，浅色主视觉）
   ========================================================================== */

:root {
  --indigo-900: #0F1638;
  --indigo: #1B2559;
  --indigo-600: #2B3A7E;
  --indigo-400: #6B7BC4;

  --blue: #3B7CF6;
  --blue-deep: #2A62D6;
  --blue-soft: #8FB4FA;
  --blue-tint: #EEF3FE;

  --ink: #10173A;
  --text: #3A4560;
  --muted: #6E7893;
  --line: #E4E8F2;
  --line-strong: #C9D2E8;
  --bg: #FFFFFF;
  --bg-soft: #F5F7FC;
  --bg-tint: #EEF3FE;
  --bg-deep: #1B2559;
  --ok: #1F8A5F;
  --err: #C0392B;

  --container: 1180px;
  --radius-sm: 4px;
  --radius: 6px;
  --radius-lg: 10px;

  --shadow-sm: 0 1px 2px rgba(16, 23, 58, .05);
  --shadow: 0 4px 16px rgba(16, 23, 58, .07);
  --shadow-lg: 0 14px 40px rgba(16, 23, 58, .10);

  --font: "Inter", -apple-system, BlinkMacSystemFont, "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  --font-mono: "SFMono-Regular", "JetBrains Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; }

h1, h2, h3, h4 {
  color: var(--ink);
  margin: 0;
  line-height: 1.3;
  font-weight: 600;
  letter-spacing: -.01em;
}

h1 { font-size: 44px; }
h2 { font-size: 30px; }
h3 { font-size: 19px; }
h4 { font-size: 16px; }

p { margin: 0; }

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 28px;
}

.section { padding: 88px 0; }
.section--tight { padding: 64px 0; }
.section--soft { background: var(--bg-soft); }
.section--tint { background: var(--bg-tint); }
.section--deep { background: var(--indigo); color: rgba(255,255,255,.78); }
.section--deep h2,
.section--deep h3 { color: #fff; }

.eyebrow {
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--blue);
  font-weight: 600;
  margin-bottom: 18px;
}

.section-head { max-width: 720px; margin-bottom: 52px; }
.section-head p { margin-top: 16px; font-size: 17px; color: var(--muted); }
.section-head--center { margin-left: auto; margin-right: auto; text-align: center; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 46px;
  padding: 0 24px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  transition: background .18s ease, color .18s ease, border-color .18s ease;
  white-space: nowrap;
}
.btn--primary { background: var(--indigo); color: #fff; }
.btn--primary:hover { background: var(--indigo-600); }
.btn--accent { background: var(--blue); color: #fff; }
.btn--accent:hover { background: var(--blue-deep); }
.btn--ghost { border-color: var(--line-strong); color: var(--indigo); background: transparent; }
.btn--ghost:hover { border-color: var(--indigo); background: rgba(27,37,89,.04); }
.btn--sm { height: 38px; padding: 0 16px; font-size: 14px; }
.btn--block { width: 100%; }

/* ---------- 顶栏 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,.92);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
  gap: 24px;
}
.brand { display: flex; align-items: center; gap: 11px; }
.brand-mark { width: 34px; height: 34px; flex: none; }
.brand-mark .mark-bg { fill: var(--blue); }
.brand-mark .mark-bar { fill: #FFFFFF; }
.brand-mark .mark-bar--soft { fill: rgba(255,255,255,.62); }
.brand-name { display: flex; flex-direction: column; line-height: 1.15; }
.brand-name strong { font-size: 17px; font-weight: 600; color: var(--ink); letter-spacing: .02em; }
.brand-name em {
  font-style: normal;
  font-size: 10px;
  letter-spacing: .18em;
  color: var(--muted);
  text-transform: uppercase;
}

.nav { display: flex; align-items: center; gap: 34px; }
.nav > a,
.nav-item > a {
  font-size: 15px;
  color: var(--text);
  padding: 6px 0;
  border-bottom: 2px solid transparent;
  transition: color .18s, border-color .18s;
}
.nav > a:hover,
.nav-item > a:hover { color: var(--indigo); }
.nav > a.is-active,
.nav-item > a.is-active { color: var(--indigo); border-bottom-color: var(--blue); font-weight: 500; }

/* ---------- 导航下拉菜单 ---------- */
.nav-item { position: relative; display: flex; align-items: center; gap: 1px; }
.nav-caret {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px; height: 22px;
  padding: 0;
  border: 0;
  background: transparent;
  border-radius: 4px;
  color: var(--muted);
  cursor: pointer;
  transition: background .18s, color .18s, transform .18s;
}
.nav-caret svg {
  width: 11px; height: 11px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.nav-caret:hover { background: var(--bg-tint); color: var(--indigo); }
.nav-item.is-open .nav-caret { color: var(--blue); transform: rotate(180deg); }

.nav-menu {
  position: absolute;
  top: calc(100% + 14px);
  left: -16px;
  min-width: 324px;
  display: grid;
  gap: 2px;
  padding: 10px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity .18s ease, transform .18s ease, visibility .18s;
  z-index: 60;
}
/* 悬停桥接区：让鼠标从导航项移入菜单时不中断 */
.nav-menu::before {
  content: "";
  position: absolute;
  left: 0; right: 0;
  top: -14px;
  height: 14px;
}
.nav-item.is-open .nav-menu { opacity: 1; visibility: visible; transform: none; }

.nav-menu--wide { min-width: 600px; grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: 6px; }
.nav-menu a { font-size: inherit; color: inherit; padding: 0; border-bottom: 0; }
.nav-menu-item {
  display: block;
  padding: 12px 14px;
  border-radius: var(--radius);
  transition: background .16s ease;
}
.nav-menu-item:hover,
.nav-menu-item.is-active { background: var(--bg-tint); }
.nav-menu-item strong { display: block; font-size: 15px; font-weight: 600; color: var(--ink); }
.nav-menu-item.is-active strong { color: var(--blue); }
.nav-menu-item em { display: block; font-style: normal; font-size: 12.5px; color: var(--muted); margin-top: 3px; }

.header-actions { display: flex; align-items: center; gap: 14px; }
.lang-switch {
  height: 34px;
  padding: 0 12px;
  border: 1px solid var(--line-strong);
  background: #fff;
  border-radius: var(--radius-sm);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--indigo);
  cursor: pointer;
  font-weight: 500;
}
.lang-switch:hover { border-color: var(--indigo); }

.nav-toggle {
  display: none;
  width: 40px; height: 40px;
  border: 1px solid var(--line-strong);
  background: #fff;
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: 11px 10px;
}
.nav-toggle span { display: block; height: 1.5px; background: var(--indigo); margin: 4px 0; }

/* ---------- Hero ---------- */
.hero {
  background: var(--bg-tint);
  color: var(--text);
  padding: 96px 0 88px;
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(27,37,89,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(27,37,89,.05) 1px, transparent 1px);
  background-size: 64px 64px;
  pointer-events: none;
}
.hero-inner { position: relative; z-index: 1; max-width: 640px; }
.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 48px;
  align-items: center;
}
.hero-media { position: relative; z-index: 1; }
.hero-media img { width: 100%; height: auto; }
.hero h1 { color: var(--ink); font-size: 46px; margin-bottom: 22px; }
.hero .lead { font-size: 18px; line-height: 1.8; color: var(--muted); max-width: 620px; }
.hero-actions { display: flex; gap: 14px; margin-top: 38px; flex-wrap: wrap; }
.hero .btn--ghost { border-color: var(--line-strong); color: var(--indigo); background: rgba(255,255,255,.7); }
.hero .btn--ghost:hover { border-color: var(--indigo); background: #fff; }

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  margin-top: 72px;
  border-top: 1px solid var(--line-strong);
  position: relative;
  z-index: 1;
}
.hero-stats div { padding: 26px 0 0; }
.hero-stats b { display: block; font-size: 30px; font-weight: 600; color: var(--indigo); line-height: 1.2; }
.hero-stats span { font-size: 13px; color: var(--muted); }

/* ---------- 卡片网格 ---------- */
.grid { display: grid; gap: 22px; }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: border-color .18s, box-shadow .18s, transform .18s;
}
.card:hover { border-color: var(--line-strong); box-shadow: var(--shadow); transform: translateY(-2px); }
.card h3 { margin-bottom: 12px; }
.card p { font-size: 15px; color: var(--muted); line-height: 1.8; }
.card-index {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--blue);
  letter-spacing: .1em;
  margin-bottom: 18px;
  display: block;
}

/* ---------- 图标 ---------- */
.card-icon {
  width: 48px; height: 48px;
  border-radius: 12px;
  background: var(--blue-tint);
  color: var(--blue-deep);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 18px;
  transition: background .18s, color .18s;
}
.card:hover .card-icon { background: var(--blue); color: #fff; }
.card-icon svg {
  width: 24px; height: 24px;
  fill: none; stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round; stroke-linejoin: round;
}
.card--icon h3 { margin-bottom: 10px; font-size: 17px; }
.card--icon p { font-size: 14.5px; line-height: 1.75; }

.tag-card { display: flex; align-items: center; gap: 14px; padding: 20px 22px; }
.tag-card .card-icon { margin-bottom: 0; width: 42px; height: 42px; border-radius: 10px; flex: none; }
.tag-card .card-icon svg { width: 21px; height: 21px; }
.tag-card h3 { font-size: 15.5px; font-weight: 500; line-height: 1.5; }

.flow-ico {
  width: 34px; height: 34px;
  border-radius: 9px;
  background: var(--blue-tint);
  color: var(--blue-deep);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 12px;
}
.flow-ico svg {
  width: 18px; height: 18px;
  fill: none; stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round; stroke-linejoin: round;
}

.panel-ico {
  width: 38px; height: 38px; flex: none;
  border-radius: 10px;
  background: var(--blue-tint);
  color: var(--blue-deep);
  display: flex; align-items: center; justify-content: center;
}
.panel-ico svg {
  width: 20px; height: 20px;
  fill: none; stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round; stroke-linejoin: round;
}
.panel-head { display: flex; align-items: center; gap: 12px; }
.panel--deep .panel-ico { background: rgba(255,255,255,.14); color: #fff; }

.stat-card { text-align: center; padding: 30px 20px; }
.stat-card b { display: block; font-size: 34px; font-weight: 600; color: var(--indigo); line-height: 1.2; }
.stat-card span { font-size: 14px; color: var(--muted); }

.dt-ico { width: 20px; height: 20px; flex: none; color: var(--blue); display: inline-flex; }
.dt-ico svg {
  width: 100%; height: 100%;
  fill: none; stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round; stroke-linejoin: round;
}

/* 可点击卡片（整卡跳转） */
.card--link { display: block; }
.card-more {
  display: inline-block;
  margin-top: 18px;
  font-size: 14px;
  font-weight: 500;
  color: var(--blue);
  transition: color .18s;
}
.card-more::after { content: "→"; margin-left: 6px; }
.card--link:hover .card-more { color: var(--blue-deep); }

/* 标签块 */
.chips { display: flex; flex-wrap: wrap; gap: 10px; }
.chips span {
  padding: 8px 18px;
  background: #fff;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-size: 14px;
  color: var(--ink);
}

/* ---------- 特性列表 ---------- */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.split--reverse .split-media { order: 2; }

.checklist { list-style: none; padding: 0; margin: 28px 0 0; display: grid; gap: 16px; }
.checklist--2 { grid-template-columns: 1fr 1fr; gap: 18px 32px; }
.checklist li { display: flex; gap: 12px; font-size: 15.5px; }
.checklist li::before {
  content: "";
  flex: none;
  width: 18px; height: 18px;
  margin-top: 5px;
  border-radius: 50%;
  background: rgba(59,124,246,.12);
  border: 1px solid rgba(59,124,246,.45);
  background-image: linear-gradient(45deg, transparent 46%, var(--blue) 46%, var(--blue) 54%, transparent 54%);
  background-size: 8px 8px;
  background-position: center;
  background-repeat: no-repeat;
}

.panel {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 34px;
}
.panel--deep { background: var(--indigo); border-color: transparent; color: rgba(255,255,255,.75); }
.panel--deep h3 { color: #fff; }
.panel-rows { display: grid; gap: 0; }
.panel-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 20px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
  font-size: 15px;
}
.panel-row:last-child { border-bottom: 0; }
.panel-row b { color: var(--ink); font-weight: 600; font-size: 18px; }
.panel--deep .panel-row { border-bottom-color: rgba(255,255,255,.14); }
.panel--deep .panel-row b { color: #fff; }

  content: "";
  position: absolute;
  left: -5px; top: 9px;
  width: 9px; height: 9px;
  border-radius: 50%;
  background: #fff;
  border: 2px solid var(--blue);
}
.timeline .tl-year { font-size: 13px; font-weight: 600; color: var(--blue); letter-spacing: .06em; }
.timeline h4 { margin: 6px 0 6px; }
.timeline p { font-size: 15px; color: var(--muted); }

/* ---------- 表单 ---------- */
.agree-row {
  display: flex;
  gap: 9px;
  align-items: flex-start;
  font-size: 13.5px;
  color: var(--text);
  cursor: pointer;
  max-width: 430px;
  line-height: 1.6;
}
.agree-row input { margin-top: 4px; flex: none; }

.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.field { display: flex; flex-direction: column; gap: 8px; }
.field--full { grid-column: 1 / -1; }
.field label { font-size: 14px; font-weight: 500; color: var(--ink); }
.field label .req { color: var(--err); margin-left: 4px; }
.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 12px 14px;
  font-size: 15px;
  font-family: inherit;
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  outline: none;
  transition: border-color .18s, box-shadow .18s;
}
.field textarea { resize: vertical; min-height: 132px; line-height: 1.7; }
.field input:focus,
.field select:focus,
.field textarea:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(59,124,246,.16);
}
.field .hint { font-size: 12.5px; color: var(--muted); }
.field .err-msg { font-size: 12.5px; color: var(--err); display: none; }
.field.has-error input,
.field.has-error textarea,
.field.has-error select { border-color: var(--err); }
.field.has-error .err-msg { display: block; }

.form-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-top: 26px;
  flex-wrap: wrap;
}
.form-note { font-size: 13px; color: var(--muted); max-width: 460px; }

.form-alert {
  display: none;
  align-items: flex-start;
  gap: 10px;
  padding: 14px 16px;
  border-radius: var(--radius);
  font-size: 14.5px;
  margin-bottom: 24px;
}
.form-alert.is-visible { display: flex; }
.form-alert--ok { background: rgba(31,138,95,.08); border: 1px solid rgba(31,138,95,.3); color: #176A4B; }
.form-alert--err { background: rgba(192,57,43,.07); border: 1px solid rgba(192,57,43,.3); color: #8E332C; }

/* ---------- 联系信息 ---------- */

/* ---------- CTA ---------- */
.cta {
  background: var(--indigo);
  border-radius: var(--radius-lg);
  padding: 56px 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}
.cta h2 { color: #fff; font-size: 26px; }
.cta p { color: rgba(255,255,255,.72); margin-top: 10px; max-width: 520px; }

/* ---------- 页脚 ---------- */
.site-footer {
  background: var(--bg-soft);
  border-top: 1px solid var(--line);
  color: var(--text);
  padding: 64px 0 30px;
  font-size: 14.5px;
}
.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1.95fr);
  gap: 68px;
  padding-bottom: 46px;
  border-bottom: 1px solid var(--line);
  align-items: start;
}

/* --- 品牌区 --- */
.footer-brand { display: flex; align-items: center; gap: 11px; margin-bottom: 16px; }
.footer-brand .brand-mark { width: 34px; height: 34px; flex: none; }
.footer-brand strong { color: var(--ink); font-size: 17px; font-weight: 600; letter-spacing: .01em; }
.footer-about {
  max-width: 330px;
  margin: 0;
  font-size: 14px;
  color: var(--muted);
  line-height: 1.9;
}

/* --- 导航分栏 --- */
.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 40px 30px;
}
.footer-col h4 {
  margin: 0 0 7px;
  color: var(--ink);
  font-size: 13.5px;
  font-weight: 600;
  letter-spacing: .04em;
}
.footer-col h4::after {
  content: "";
  display: block;
  width: 20px;
  height: 2px;
  margin-top: 10px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--blue), rgba(59,124,246,.12));
}
.site-footer a { color: var(--muted); }
.site-footer a:hover { color: var(--blue); }
.footer-links { list-style: none; padding: 0; margin: 14px 0 0; display: grid; gap: 11px; }
.footer-links a { display: inline-block; font-size: 14px; transition: color .16s ease, transform .16s ease; }
.footer-links a:hover { transform: translateX(3px); }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  padding-top: 28px;
  font-size: 13px;
  color: var(--muted);
  flex-wrap: wrap;
}

.footer-icp { display: inline-flex; align-items: center; flex-wrap: wrap; }
.icp-link {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .16s ease, border-color .16s ease;
}
.icp-link:hover { color: var(--blue); border-bottom-color: currentColor; }

/* ---------- 页面头 ---------- */
.page-head {
  background: var(--bg-tint);
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  padding: 56px 0 48px;
}
.page-head h1 { color: var(--ink); font-size: 38px; }
.page-head p { margin-top: 16px; font-size: 17px; max-width: 680px; }
.breadcrumb { font-size: 13px; color: var(--muted); margin-bottom: 18px; }
.breadcrumb span { color: var(--text); }
.page-head-grid {
  display: grid;
  grid-template-columns: 1fr 400px;
  gap: 48px;
  align-items: center;
}
.page-head-media img { width: 100%; height: auto; }

/* ---------- 业务线标签 ---------- */
.card-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--blue);
  border: 1px solid rgba(59,124,246,.45);
  border-radius: 3px;
  padding: 3px 8px;
  margin-bottom: 16px;
}

/* ---------- 服务客户 ---------- */
.clients {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.clients > div {
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 999px;
  padding: 13px 24px;
  font-size: 15px;
  font-weight: 500;
  color: var(--ink);
  transition: border-color .18s, color .18s, background .18s;
}
.clients > div:hover { border-color: var(--blue); color: var(--indigo); background: var(--bg-tint); }

/* ---------- 提示框 ---------- */
.note {
  border-left: 2px solid var(--blue);
  background: rgba(59,124,246,.05);
  padding: 18px 22px;
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 15px;
  color: var(--text);
  line-height: 1.85;
}

/* ---------- 解决方案 ---------- */
.solution {
  border-top: 1px solid var(--line);
  padding-top: 56px;
  margin-top: 56px;
}
.solution:first-of-type { border-top: 0; padding-top: 0; margin-top: 0; }
.solution[id] { scroll-margin-top: 96px; }
.solution-lead {
  font-size: 16.5px;
  color: var(--muted);
  margin-top: 14px;
  max-width: 760px;
  line-height: 1.8;
}
.sub-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  margin: 46px 0 20px;
  letter-spacing: .02em;
}

/* ---------- 产品模块卡（解决方案内） ---------- */
.module-card { padding: 28px 26px; }
.module-card .card-icon { margin-bottom: 16px; }
.module-card .card-tag { margin-bottom: 10px; }
.module-card h3 { font-size: 17px; margin-bottom: 0; }
.checklist--sm { margin-top: 14px; gap: 10px; }
.checklist--sm li { font-size: 14.5px; line-height: 1.7; color: var(--muted); }
.checklist--sm li::before { width: 15px; height: 15px; margin-top: 4px; background-size: 7px 7px; }

/* ---------- 技术底座 ---------- */
.base-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px 28px;
  margin-top: 26px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}
.base-item b { display: block; font-size: 14.5px; font-weight: 600; color: var(--ink); margin-bottom: 4px; }
.base-item span { font-size: 13.5px; color: var(--muted); line-height: 1.65; }

/* ---------- 业务流程条 ---------- */
.flow {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.flow li { background: #fff; padding: 20px 16px; }
.flow li b {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 7px;
}
.flow li span { font-size: 12.5px; color: var(--muted); line-height: 1.65; }
.flow--4 { grid-template-columns: repeat(4, 1fr); }

/* ---------- 案例框 ---------- */
.case-box {
  border: 1px solid var(--line);
  border-left: 2px solid var(--blue);
  border-radius: var(--radius-lg);
  background: var(--bg-soft);
  padding: 26px 30px;
}
.case-box strong {
  display: block;
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 8px;
}
.case-box p { font-size: 15px; color: var(--muted); }
.case-box .case-meta {
  font-size: 13.5px;
  color: var(--blue);
  line-height: 1.7;
  margin-bottom: 14px;
}
.case-box p + p { margin-top: 0; }
.case-box .case-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  margin: 24px 0 14px;
  letter-spacing: .02em;
}
.case-box .case-list { margin: 0; gap: 14px 28px; }
.case-box .case-list li { font-size: 14.5px; line-height: 1.75; color: var(--text); }
.case-box .case-src {
  font-size: 13px;
  color: var(--muted);
  margin-top: 22px;
  padding-top: 14px;
  border-top: 1px dashed var(--line-strong);
}

/* ---------- 应用案例 · 简洁机构卡 ---------- */
.case-group {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: .02em;
  margin: 30px 0 16px;
}
.case-group::before {
  content: "";
  width: 3px;
  height: 15px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--blue), var(--indigo));
}
.sub-title + .case-group { margin-top: 0; }
.case-mini { padding: 22px 24px; }
.case-mini strong {
  display: block;
  font-size: 16.5px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 8px;
}
.case-mini span { font-size: 13.5px; color: var(--blue); font-weight: 500; line-height: 1.7; }
.case-note { margin-top: 22px; font-size: 13px; color: var(--muted); }


/* ---------- 通用工具 ---------- */
.mt-0 { margin-top: 0; }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mt-40 { margin-top: 40px; }
.mt-56 { margin-top: 56px; }
.text-center { text-align: center; }

/* ---------- 响应式 ---------- */
@media (max-width: 1120px) and (min-width: 861px) {
  .nav { gap: 20px; }
  .header-actions { gap: 10px; }
  .header-actions .btn--sm { padding: 0 12px; }
}

@media (max-width: 1024px) {
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; gap: 40px; }
  .footer-about { max-width: 560px; }
  .hero h1 { font-size: 38px; }
}

@media (max-width: 860px) {
  .section { padding: 64px 0; }
  .nav, .header-actions .btn { display: none; }
  .nav-toggle { display: block; }
  .site-header.is-open .nav {
    display: flex;
    position: absolute;
    top: 74px; left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: #fff;
    border-bottom: 1px solid var(--line);
    padding: 8px 28px 20px;
    box-shadow: var(--shadow);
  }
  .site-header.is-open .nav > a,
  .site-header.is-open .nav-item > a { padding: 14px 0; border-bottom: 1px solid var(--line); }
  .site-header.is-open .nav > a.is-active,
  .site-header.is-open .nav-item > a.is-active { border-bottom-color: var(--line); color: var(--blue); }

  .nav-item { width: 100%; flex-direction: column; align-items: stretch; gap: 0; }
  .nav-caret { position: absolute; right: 0; top: 12px; width: 36px; height: 36px; }
  .nav-caret:hover { background: transparent; }
  .nav-item.is-open .nav-caret { transform: none; }
  .nav-menu {
    position: static;
    min-width: 0;
    padding: 0 0 10px 10px;
    border: 0;
    border-radius: 0;
    box-shadow: none;
    background: transparent;
    opacity: 1;
    visibility: visible;
    transform: none;
    display: none;
  }
  .nav-item.is-open .nav-menu { display: grid; }
  .nav-menu--wide { grid-template-columns: 1fr; }
  .nav-menu::before { display: none; }
  .nav-menu-item { padding: 10px 12px; }

  .split { grid-template-columns: 1fr; gap: 40px; }
  .split--reverse .split-media { order: 0; }
  .hero-grid, .page-head-grid { grid-template-columns: 1fr; gap: 36px; }
  .hero-media img, .page-head-media img { max-width: 460px; margin: 0 auto; }
  .clients { gap: 10px; }
  .clients > div { padding: 11px 18px; font-size: 14px; }
  .checklist--2 { grid-template-columns: 1fr; }
  .flow { grid-template-columns: repeat(3, 1fr); }
  .flow--4 { grid-template-columns: repeat(2, 1fr); }
  .grid--2, .grid--3 { grid-template-columns: 1fr; }
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .base-list { grid-template-columns: repeat(2, 1fr); }
  .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 0; }
  .hero-stats div { padding: 22px 0; border-bottom: 1px solid var(--line); }
  .form-grid { grid-template-columns: 1fr; }
  .cta { padding: 40px 28px; }
  .cta h2 { font-size: 22px; }
}

@media (max-width: 560px) {
  .container { padding: 0 20px; }
  h1 { font-size: 32px; }
  .hero h1 { font-size: 30px; }
  h2 { font-size: 24px; }
  .grid--4 { grid-template-columns: 1fr; }
  .base-list { grid-template-columns: 1fr; gap: 16px; }
  .module-card { padding: 24px 22px; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-nav { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 32px 24px; }
  .hero { padding: 72px 0 64px; }
  .hero-stats { grid-template-columns: 1fr 1fr; }
  .flow { grid-template-columns: repeat(2, 1fr); }
  .case-box { padding: 22px 20px; }
  .chat-invite { padding: 40px 24px; }
}

/* ==========================================================================
   联系页 · 智能客服引导
   ========================================================================== */
.chat-invite {
  max-width: 680px;
  margin: 0 auto;
  text-align: center;
  padding: 58px 44px 52px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: linear-gradient(180deg, var(--blue-tint) 0%, #fff 72%);
}
.chat-invite-ico {
  width: 66px;
  height: 66px;
  margin: 0 auto;
  border-radius: 50%;
  background: linear-gradient(140deg, var(--blue), var(--blue-deep));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: 0 12px 28px rgba(43, 98, 214, .28);
}
.chat-invite-ico svg {
  width: 32px;
  height: 32px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.chat-invite h2 { margin-top: 24px; font-size: 27px; }
.chat-invite p {
  margin-top: 15px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
}
.chat-invite .btn { margin-top: 30px; }
.chat-invite-foot {
  margin-top: 26px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  font-size: 14px;
  color: var(--muted);
}
.chat-invite-foot a {
  color: var(--blue);
  border-bottom: 1px solid var(--line-strong);
  transition: border-color .18s;
}
.chat-invite-foot a:hover { border-bottom-color: var(--blue); }

/* button 形态的 .btn（用于唤起客服） */
button.btn {
  border: 0;
  font-family: inherit;
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
}

/* ==========================================================================
   AI 智能客服 · 全站悬浮球
   ========================================================================== */
.ai-chat { position: fixed; right: 26px; bottom: 26px; z-index: 120; }

.ai-launcher {
  position: relative;
  width: 58px;
  height: 58px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: linear-gradient(140deg, var(--blue), var(--blue-deep));
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 10px 26px rgba(43, 98, 214, .34);
  transition: transform .2s, box-shadow .2s;
}
.ai-launcher:hover { transform: translateY(-2px); box-shadow: 0 14px 32px rgba(43, 98, 214, .42); }
.ai-launcher:focus-visible { outline: 2px solid var(--blue); outline-offset: 3px; }
.ai-launcher svg {
  width: 26px;
  height: 26px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.ai-ico-close { display: none; }
.ai-chat.is-open .ai-ico-chat { display: none; }
.ai-chat.is-open .ai-ico-close { display: block; }
.ai-launcher::after {
  content: "";
  position: absolute;
  right: 1px;
  top: 1px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #22C55E;
  border: 2.5px solid #fff;
}
.ai-chat.is-open .ai-launcher::after { display: none; }

.ai-panel {
  position: absolute;
  right: 0;
  bottom: 74px;
  width: 378px;
  height: min(592px, calc(100vh - 150px));
  display: flex;
  flex-direction: column;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: 0 20px 56px rgba(16, 23, 58, .18);
  overflow: hidden;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px) scale(.985);
  transform-origin: bottom right;
  transition: opacity .2s ease, transform .2s ease, visibility .2s;
}
.ai-chat.is-open .ai-panel { opacity: 1; visibility: visible; transform: none; }

.ai-panel-head {
  display: flex;
  align-items: center;
  gap: 11px;
  padding: 15px 16px;
  background: var(--blue-tint);
  border-bottom: 1px solid var(--line);
}
.ai-avatar {
  width: 38px;
  height: 38px;
  flex: none;
  border-radius: 50%;
  background: linear-gradient(140deg, var(--blue), var(--blue-deep));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
}
.ai-avatar svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.ai-id { flex: 1; min-width: 0; }
.ai-id strong { display: block; font-size: 15px; font-weight: 600; color: var(--ink); line-height: 1.45; }
.ai-id em {
  display: flex;
  align-items: center;
  gap: 5px;
  font-style: normal;
  font-size: 12px;
  color: var(--muted);
}
.ai-id em::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: #22C55E; }
.ai-panel-close {
  width: 30px;
  height: 30px;
  flex: none;
  padding: 0;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background .16s, color .16s;
}
.ai-panel-close:hover { background: rgba(16, 23, 58, .06); color: var(--ink); }
.ai-panel-close svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; }

.ai-body {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 18px 16px 8px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: #fff;
  scrollbar-width: thin;
}
.ai-body::-webkit-scrollbar { width: 6px; }
.ai-body::-webkit-scrollbar-thumb { background: var(--line-strong); border-radius: 3px; }

.ai-msg { display: flex; }
.ai-msg--user { justify-content: flex-end; }
.ai-bubble {
  max-width: 82%;
  padding: 10px 13px;
  font-size: 14px;
  line-height: 1.68;
  border-radius: 13px 13px 13px 5px;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  color: var(--text);
  white-space: pre-wrap;
  word-break: break-word;
}
.ai-msg--user .ai-bubble {
  background: linear-gradient(140deg, var(--blue), var(--blue-deep));
  border-color: transparent;
  color: #fff;
  border-radius: 13px 13px 5px 13px;
}

.ai-typing { display: flex; gap: 4px; align-items: center; padding: 4px 2px; }
.ai-typing i {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--blue-soft);
  animation: ai-blink 1.3s infinite ease-in-out;
}
.ai-typing i:nth-child(2) { animation-delay: .18s; }
.ai-typing i:nth-child(3) { animation-delay: .36s; }
@keyframes ai-blink {
  0%, 60%, 100% { opacity: .35; transform: translateY(0); }
  30% { opacity: 1; transform: translateY(-3px); }
}
@media (prefers-reduced-motion: reduce) {
  .ai-typing i { animation: none; opacity: .6; }
}

.ai-quick { padding: 4px 16px 12px; display: flex; flex-wrap: wrap; gap: 8px; }
.ai-quick-title { width: 100%; font-size: 12px; color: var(--muted); }
.ai-quick button {
  font-family: inherit;
  font-size: 12.5px;
  line-height: 1;
  padding: 8px 12px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: #fff;
  color: var(--blue);
  cursor: pointer;
  transition: background .16s, border-color .16s;
}
.ai-quick button:hover { background: var(--blue-tint); border-color: var(--blue-soft); }
.ai-quick[hidden] { display: none; }

.ai-form {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 12px 14px 10px;
  border-top: 1px solid var(--line);
  background: #fff;
}
.ai-form input {
  flex: 1;
  min-width: 0;
  height: 42px;
  padding: 0 16px;
  font-family: inherit;
  font-size: 14px;
  color: var(--ink);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: var(--bg-soft);
  outline: none;
  transition: border-color .16s, box-shadow .16s, background .16s;
}
.ai-form input::placeholder { color: var(--muted); }
.ai-form input:focus {
  background: #fff;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(59, 124, 246, .14);
}
.ai-form button {
  width: 42px;
  height: 42px;
  flex: none;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: linear-gradient(140deg, var(--blue), var(--blue-deep));
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity .16s, transform .16s;
}
.ai-form button:hover { transform: scale(1.05); }
.ai-form button:disabled { opacity: .45; cursor: default; transform: none; }
.ai-form button svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.ai-foot {
  padding: 0 16px 12px;
  font-size: 11.5px;
  line-height: 1.65;
  color: var(--muted);
  text-align: center;
  background: #fff;
}
.ai-foot a { color: var(--blue); }
.ai-foot a:hover { text-decoration: underline; }
.ai-foot-mail { display: block; margin-bottom: 3px; }

@media (max-width: 560px) {
  .ai-chat { right: 16px; bottom: 16px; }
  .ai-chat.is-open .ai-launcher { display: none; }
  .ai-panel {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    max-height: none;
    border: 0;
    border-radius: 0;
    box-shadow: none;
  }
  .ai-bubble { max-width: 86%; }
}


/* ==========================================================================
   辅助图形元素（浅色装饰层）
   全部使用 background-image 实现，位于背景层，不影响内容层级、对比度与点击
   ========================================================================== */

/* --- 内页头部：同心圆环 + 点阵 + 弧线 + 柔光 --- */
.page-head {
  position: relative;
  overflow: hidden;
  background-color: var(--bg-tint);
  background-image:
    linear-gradient(90deg, rgba(59,124,246,0), rgba(59,124,246,.55), rgba(59,124,246,0)),
    url("data:image/svg+xml,%3Csvg%20xmlns=%27http://www.w3.org/2000/svg%27%20width=%27340%27%20height=%27340%27%20viewBox=%270%200%20340%20340%27%20fill=%27none%27%3E%3Cg%20stroke=%27%233B7CF6%27%20stroke-opacity=%270.2%27%3E%3Ccircle%20cx=%27170.0%27%20cy=%27170.0%27%20r=%27168.0%27/%3E%3Ccircle%20cx=%27170.0%27%20cy=%27170.0%27%20r=%27125.8%27%20stroke-dasharray=%275%208%27/%3E%3Ccircle%20cx=%27170.0%27%20cy=%27170.0%27%20r=%2785.0%27/%3E%3Ccircle%20cx=%27170.0%27%20cy=%27170.0%27%20r=%2742.5%27%20stroke-opacity=%270.12%27/%3E%3C/g%3E%3C/svg%3E"),
    url("data:image/svg+xml,%3Csvg%20xmlns=%27http://www.w3.org/2000/svg%27%20width=%27420%27%20height=%27210%27%20viewBox=%270%200%20420%20210%27%20fill=%27none%27%3E%3Cpath%20d=%27M8%20202%20a202.000000%20202.000000%200%200%201%20404%200%27%20stroke=%27%233B7CF6%27%20stroke-opacity=%270.18%27/%3E%3Cpath%20d=%27M52%20202%20a158.000000%20158.000000%200%200%201%20316%200%27%20stroke=%27%233B7CF6%27%20stroke-opacity=%270.153%27%20stroke-dasharray=%274%209%27/%3E%3C/svg%3E"),
    url("data:image/svg+xml,%3Csvg%20xmlns=%27http://www.w3.org/2000/svg%27%20width=%27126%27%20height=%27126%27%20viewBox=%270%200%20126%20126%27%3E%3Cg%20fill=%27%233B7CF6%27%20fill-opacity=%270.32%27%3E%3Ccircle%20cx=%2718%27%20cy=%2718%27%20r=%271.9%27/%3E%3Ccircle%20cx=%2736%27%20cy=%2718%27%20r=%271.9%27/%3E%3Ccircle%20cx=%2754%27%20cy=%2718%27%20r=%271.9%27/%3E%3Ccircle%20cx=%2772%27%20cy=%2718%27%20r=%271.9%27/%3E%3Ccircle%20cx=%2790%27%20cy=%2718%27%20r=%271.9%27/%3E%3Ccircle%20cx=%27108%27%20cy=%2718%27%20r=%271.9%27/%3E%3Ccircle%20cx=%2718%27%20cy=%2736%27%20r=%271.9%27/%3E%3Ccircle%20cx=%2736%27%20cy=%2736%27%20r=%271.9%27/%3E%3Ccircle%20cx=%2754%27%20cy=%2736%27%20r=%271.9%27/%3E%3Ccircle%20cx=%2772%27%20cy=%2736%27%20r=%271.9%27/%3E%3Ccircle%20cx=%2790%27%20cy=%2736%27%20r=%271.9%27/%3E%3Ccircle%20cx=%27108%27%20cy=%2736%27%20r=%271.9%27/%3E%3Ccircle%20cx=%2718%27%20cy=%2754%27%20r=%271.9%27/%3E%3Ccircle%20cx=%2736%27%20cy=%2754%27%20r=%271.9%27/%3E%3Ccircle%20cx=%2754%27%20cy=%2754%27%20r=%271.9%27/%3E%3Ccircle%20cx=%2772%27%20cy=%2754%27%20r=%271.9%27/%3E%3Ccircle%20cx=%2790%27%20cy=%2754%27%20r=%271.9%27/%3E%3Ccircle%20cx=%27108%27%20cy=%2754%27%20r=%271.9%27/%3E%3Ccircle%20cx=%2718%27%20cy=%2772%27%20r=%271.9%27/%3E%3Ccircle%20cx=%2736%27%20cy=%2772%27%20r=%271.9%27/%3E%3Ccircle%20cx=%2754%27%20cy=%2772%27%20r=%271.9%27/%3E%3Ccircle%20cx=%2772%27%20cy=%2772%27%20r=%271.9%27/%3E%3Ccircle%20cx=%2790%27%20cy=%2772%27%20r=%271.9%27/%3E%3Ccircle%20cx=%27108%27%20cy=%2772%27%20r=%271.9%27/%3E%3Ccircle%20cx=%2718%27%20cy=%2790%27%20r=%271.9%27/%3E%3Ccircle%20cx=%2736%27%20cy=%2790%27%20r=%271.9%27/%3E%3Ccircle%20cx=%2754%27%20cy=%2790%27%20r=%271.9%27/%3E%3Ccircle%20cx=%2772%27%20cy=%2790%27%20r=%271.9%27/%3E%3Ccircle%20cx=%2790%27%20cy=%2790%27%20r=%271.9%27/%3E%3Ccircle%20cx=%27108%27%20cy=%2790%27%20r=%271.9%27/%3E%3Ccircle%20cx=%2718%27%20cy=%27108%27%20r=%271.9%27/%3E%3Ccircle%20cx=%2736%27%20cy=%27108%27%20r=%271.9%27/%3E%3Ccircle%20cx=%2754%27%20cy=%27108%27%20r=%271.9%27/%3E%3Ccircle%20cx=%2772%27%20cy=%27108%27%20r=%271.9%27/%3E%3Ccircle%20cx=%2790%27%20cy=%27108%27%20r=%271.9%27/%3E%3Ccircle%20cx=%27108%27%20cy=%27108%27%20r=%271.9%27/%3E%3C/g%3E%3C/svg%3E"),
    radial-gradient(circle at 94% 6%, rgba(59,124,246,.16), rgba(59,124,246,0) 46%),
    radial-gradient(circle at 6% 102%, rgba(107,123,196,.13), rgba(107,123,196,0) 42%);
  background-repeat: no-repeat;
  background-position:
    top left,
    right -120px top -130px,
    right 40px bottom -34px,
    left 16px bottom 10px,
    center, center;
  background-size: 100% 2px, 340px 340px, 300px 150px, 126px 126px, auto, auto;
}
.page-head-grid { position: relative; z-index: 1; }

/* 各页头部装饰位置差异化（按 body[data-page] 分组） */
body[data-page="business-ai"] .page-head,
body[data-page="business-ai-medbuddy"] .page-head,
body[data-page="business-medical-geo"] .page-head {
  background-position:
    top left,
    left -130px top -140px,
    left 30px bottom -30px,
    right 20px top 18px,
    center, center;
}
body[data-page="about"] .page-head,
body[data-page="contact"] .page-head,
body[data-page="business-ai-sentinel"] .page-head {
  background-position:
    top left,
    right -130px bottom -150px,
    left -60px bottom -40px,
    right 26px top 20px,
    center, center;
}

/* --- 首页首屏：大圆环 + 双层柔光 --- */
.hero {
  background-color: var(--bg-tint);
  background-image:
    url("data:image/svg+xml,%3Csvg%20xmlns=%27http://www.w3.org/2000/svg%27%20width=%27200%27%20height=%27200%27%20viewBox=%270%200%20200%20200%27%20fill=%27none%27%3E%3Cg%20stroke=%27%233B7CF6%27%20stroke-opacity=%270.22%27%3E%3Ccircle%20cx=%27100.0%27%20cy=%27100.0%27%20r=%2798.0%27/%3E%3Ccircle%20cx=%27100.0%27%20cy=%27100.0%27%20r=%2750.0%27/%3E%3Ccircle%20cx=%27100.0%27%20cy=%27100.0%27%20r=%2725.0%27%20stroke-opacity=%270.132%27/%3E%3C/g%3E%3C/svg%3E"),
    radial-gradient(circle at 88% 4%, rgba(59,124,246,.17), rgba(59,124,246,0) 44%),
    radial-gradient(circle at 2% 96%, rgba(143,180,250,.30), rgba(143,180,250,0) 40%);
  background-repeat: no-repeat;
  background-position: right -60px bottom -90px, center, center;
  background-size: 260px 260px, auto, auto;
}

/* --- 浅色区块：细点阵纹理 --- */
.section--soft {
  background-color: var(--bg-soft);
  background-image: radial-gradient(rgba(27,37,89,.055) 1px, transparent 1.5px);
  background-size: 22px 22px;
}
.section--tint {
  background-color: var(--bg-tint);
  background-image: radial-gradient(rgba(59,124,246,.10) 1px, transparent 1.5px);
  background-size: 22px 22px;
}

/* --- 卡片：右上柔光角 --- */
.card {
  background-color: #fff;
  background-image: radial-gradient(circle at 100% 0%, rgba(59,124,246,.11), rgba(59,124,246,0) 46%);
  background-repeat: no-repeat;
  background-size: 250px 180px;
  background-position: top right;
  transition: border-color .18s, box-shadow .18s, transform .18s, background-size .25s ease;
}
.card:hover { background-size: 330px 230px; }

/* --- 图标容器：渐变底 + 内描边 --- */
.card-icon,
.flow-ico,
.panel-ico {
  background-image: linear-gradient(140deg, rgba(59,124,246,.18), rgba(143,180,250,.05));
  box-shadow: inset 0 0 0 1px rgba(59,124,246,.16);
}
.card:hover .card-icon {
  background-image: linear-gradient(140deg, var(--blue), var(--blue-deep));
  box-shadow: none;
}

/* --- 小标题：渐变短线 --- */
.eyebrow { display: inline-flex; align-items: center; gap: 9px; }
.eyebrow::before {
  content: "";
  width: 20px;
  height: 2px;
  flex: none;
  border-radius: 2px;
  background: linear-gradient(90deg, rgba(59,124,246,0), var(--blue));
}

/* --- 统计卡：顶部柔光 --- */
.stat-card {
  background-image: radial-gradient(circle at 50% -10%, rgba(59,124,246,.11), rgba(59,124,246,0) 62%);
  background-repeat: no-repeat;
}

/* --- 咨询 CTA：白色圆环 + 柔光 --- */
.cta {
  position: relative;
  overflow: hidden;
  background-color: var(--indigo);
  background-image:
    url("data:image/svg+xml,%3Csvg%20xmlns=%27http://www.w3.org/2000/svg%27%20width=%27300%27%20height=%27300%27%20viewBox=%270%200%20300%20300%27%20fill=%27none%27%3E%3Cg%20stroke=%27%23FFFFFF%27%20stroke-opacity=%270.14%27%3E%3Ccircle%20cx=%27150.0%27%20cy=%27150.0%27%20r=%27148.0%27/%3E%3Ccircle%20cx=%27150.0%27%20cy=%27150.0%27%20r=%27111.0%27%20stroke-dasharray=%275%208%27/%3E%3Ccircle%20cx=%27150.0%27%20cy=%27150.0%27%20r=%2775.0%27/%3E%3Ccircle%20cx=%27150.0%27%20cy=%27150.0%27%20r=%2737.5%27%20stroke-opacity=%270.084%27/%3E%3C/g%3E%3C/svg%3E"),
    radial-gradient(circle at 92% 0%, rgba(59,124,246,.34), rgba(59,124,246,0) 56%),
    radial-gradient(circle at 4% 104%, rgba(143,180,250,.22), rgba(143,180,250,0) 52%);
  background-repeat: no-repeat;
  background-position: right -80px top -100px, center, center;
  background-size: 300px 300px, auto, auto;
}
.cta > * { position: relative; z-index: 1; }

/* --- 客服引导卡（联系页） --- */
.chat-invite {
  position: relative;
  overflow: hidden;
  background-image:
    url("data:image/svg+xml,%3Csvg%20xmlns=%27http://www.w3.org/2000/svg%27%20width=%2796%27%20height=%2796%27%20viewBox=%270%200%2096%2096%27%3E%3Cg%20fill=%27%236B7BC4%27%20fill-opacity=%270.3%27%3E%3Ccircle%20cx=%2716%27%20cy=%2716%27%20r=%271.7%27/%3E%3Ccircle%20cx=%2732%27%20cy=%2716%27%20r=%271.7%27/%3E%3Ccircle%20cx=%2748%27%20cy=%2716%27%20r=%271.7%27/%3E%3Ccircle%20cx=%2764%27%20cy=%2716%27%20r=%271.7%27/%3E%3Ccircle%20cx=%2780%27%20cy=%2716%27%20r=%271.7%27/%3E%3Ccircle%20cx=%2716%27%20cy=%2732%27%20r=%271.7%27/%3E%3Ccircle%20cx=%2732%27%20cy=%2732%27%20r=%271.7%27/%3E%3Ccircle%20cx=%2748%27%20cy=%2732%27%20r=%271.7%27/%3E%3Ccircle%20cx=%2764%27%20cy=%2732%27%20r=%271.7%27/%3E%3Ccircle%20cx=%2780%27%20cy=%2732%27%20r=%271.7%27/%3E%3Ccircle%20cx=%2716%27%20cy=%2748%27%20r=%271.7%27/%3E%3Ccircle%20cx=%2732%27%20cy=%2748%27%20r=%271.7%27/%3E%3Ccircle%20cx=%2748%27%20cy=%2748%27%20r=%271.7%27/%3E%3Ccircle%20cx=%2764%27%20cy=%2748%27%20r=%271.7%27/%3E%3Ccircle%20cx=%2780%27%20cy=%2748%27%20r=%271.7%27/%3E%3Ccircle%20cx=%2716%27%20cy=%2764%27%20r=%271.7%27/%3E%3Ccircle%20cx=%2732%27%20cy=%2764%27%20r=%271.7%27/%3E%3Ccircle%20cx=%2748%27%20cy=%2764%27%20r=%271.7%27/%3E%3Ccircle%20cx=%2764%27%20cy=%2764%27%20r=%271.7%27/%3E%3Ccircle%20cx=%2780%27%20cy=%2764%27%20r=%271.7%27/%3E%3Ccircle%20cx=%2716%27%20cy=%2780%27%20r=%271.7%27/%3E%3Ccircle%20cx=%2732%27%20cy=%2780%27%20r=%271.7%27/%3E%3Ccircle%20cx=%2748%27%20cy=%2780%27%20r=%271.7%27/%3E%3Ccircle%20cx=%2764%27%20cy=%2780%27%20r=%271.7%27/%3E%3Ccircle%20cx=%2780%27%20cy=%2780%27%20r=%271.7%27/%3E%3C/g%3E%3C/svg%3E"),
    radial-gradient(circle at 88% 0%, rgba(59,124,246,.14), rgba(59,124,246,0) 55%),
    linear-gradient(180deg, var(--blue-tint) 0%, #fff 72%);
  background-repeat: no-repeat;
  background-position: right 22px top 20px, center, center;
  background-size: 96px 96px, auto, auto;
}
.chat-invite > * { position: relative; z-index: 1; }

/* --- 页脚：顶部渐变线 + 点阵 --- */
.site-footer {
  background-color: var(--bg-soft);
  background-image:
    linear-gradient(90deg, rgba(59,124,246,0), rgba(59,124,246,.5), rgba(59,124,246,0)),
    radial-gradient(rgba(27,37,89,.05) 1px, transparent 1.5px);
  background-repeat: no-repeat, repeat;
  background-position: top left, 0 0;
  background-size: 100% 1px, 22px 22px;
}

/* --- 小屏收敛装饰尺寸 --- */
@media (max-width: 860px) {
  .page-head {
    background-position:
      top left,
      right -110px top -120px,
      right 10px bottom -30px,
      left 12px bottom 8px,
      center, center;
    background-size: 100% 2px, 240px 240px, 220px 110px, 96px 96px, auto, auto;
  }
  .hero { background-size: 200px 200px, auto, auto; }
  .site-footer { background-size: 100% 1px, 20px 20px; }
}

/* --- 导航下拉项：左侧渐变指示条 --- */
.nav-menu-item { position: relative; }
.nav-menu-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  bottom: 14px;
  width: 3px;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--blue), rgba(59,124,246,0));
  opacity: 0;
  transition: opacity .16s ease;
}
.nav-menu-item:hover::before,
.nav-menu-item.is-active::before { opacity: 1; }

/* ==========================================================================
   GEO：常见问题（FAQ）
   问答式内容便于生成式引擎（AI 搜索 / 智能问答）摘录与引用
   ========================================================================== */
.faq-lead { color: var(--muted); max-width: 760px; margin: 10px 0 0; }

.faq-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 26px;
}

.faq-item {
  position: relative;
  overflow: hidden;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 22px 24px 24px;
  box-shadow: var(--shadow-sm);
}
.faq-item::after {
  content: "";
  position: absolute;
  right: -48px;
  top: -48px;
  width: 150px;
  height: 150px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(59, 124, 246, .10), rgba(59, 124, 246, 0) 70%);
  pointer-events: none;
}

.faq-item h3 {
  display: flex;
  gap: 10px;
  margin: 0 0 10px;
  font-size: 16px;
  line-height: 1.5;
  color: var(--ink);
}
.faq-item h3::before {
  content: "Q";
  flex: none;
  width: 22px;
  height: 22px;
  margin-top: 1px;
  border-radius: var(--radius);
  background: var(--blue-tint);
  color: var(--blue-deep);
  font: 700 12px/22px var(--font);
  text-align: center;
}

.faq-item p {
  margin: 0;
  color: var(--text);
  font-size: 14.5px;
  line-height: 1.78;
}

.faq-ask {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 24px;
  padding: 0;
  border: 0;
  background: none;
  cursor: pointer;
  color: var(--blue);
  font: 600 14.5px/1.5 var(--font);
}
.faq-ask::after { content: "→"; font-weight: 700; }
.faq-ask:hover { color: var(--blue-deep); text-decoration: underline; }

@media (max-width: 860px) {
  .faq-list { grid-template-columns: 1fr; gap: 14px; }
  .faq-item { padding: 18px 18px 20px; }
}