/* ==========================================================================
   信息蚁 Xinxiyi — Design System
   面向中小企业的 GEO / SEO 增长服务
   ========================================================================== */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

img, svg { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: 0; background: none; color: inherit; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, h5 { margin: 0; line-height: 1.25; font-weight: 700; letter-spacing: -0.01em; }
p { margin: 0; }
input, textarea, select { font: inherit; color: inherit; }

/* ---------- 2. Tokens ---------- */
:root {
  --ink:        #0B1B2B;
  --ink-2:      #33475C;
  --ink-3:      #64798F;
  --line:       #E3EAF2;
  --line-soft:  #EEF3F9;
  --bg:         #FFFFFF;
  --bg-soft:    #F6F9FD;
  --bg-deep:    #0A2540;

  --brand:      #0F9B6E;
  --brand-dk:   #0A7A57;
  --brand-lt:   #E8F7F1;
  --violet:     #2DD4A0;
  --amber:      #F47920;
  --amber-dk:   #D15A0C;
  --green:      #0F9B6E;

  --grad: linear-gradient(120deg, #0F9B6E 0%, #12B583 45%, #2DD4A0 100%);
  --grad-warm: linear-gradient(120deg, #F47920 0%, #FFB020 100%);

  --shadow-xs: 0 1px 2px rgba(11, 27, 43, .06);
  --shadow-sm: 0 2px 8px rgba(11, 27, 43, .06);
  --shadow-md: 0 10px 30px rgba(11, 27, 43, .08);
  --shadow-lg: 0 24px 60px rgba(11, 27, 43, .12);

  --r-sm: 8px;
  --r-md: 14px;
  --r-lg: 20px;
  --r-xl: 28px;

  --maxw: 1180px;
  --pad: 24px;
  --header-h: 72px;
}

/* ---------- 3. Layout ---------- */
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 var(--pad); }

.section { padding: 92px 0; }
.section--soft { background: var(--bg-soft); }
.section--tight { padding: 68px 0; }

.sec-head { max-width: 720px; margin: 0 auto 52px; text-align: center; }
.sec-head--left { margin-left: 0; text-align: left; }
.sec-head p { color: var(--ink-3); font-size: 17px; margin-top: 14px; }

.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase;
  color: var(--brand); background: var(--brand-lt);
  padding: 6px 14px; border-radius: 999px; margin-bottom: 18px;
}
.eyebrow--warm { color: var(--amber-dk); background: #FFF6E5; }
.eyebrow--ghost { color: rgba(255,255,255,.9); background: rgba(255,255,255,.12); }

h1 { font-size: clamp(32px, 4.4vw, 54px); }
h2 { font-size: clamp(26px, 3.2vw, 40px); }
h3 { font-size: clamp(19px, 2vw, 23px); }
.lead { font-size: 18px; color: var(--ink-2); }

.grad-text { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }

/* ---------- 4. Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 50px; padding: 0 26px; border-radius: 999px;
  font-size: 15.5px; font-weight: 600; white-space: nowrap;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease, color .18s ease, border-color .18s ease;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--grad); color: #fff; box-shadow: 0 8px 22px rgba(22, 87, 224, .28); }
.btn-primary:hover { box-shadow: 0 12px 30px rgba(22, 87, 224, .36); transform: translateY(-2px); }
.btn-ghost { border: 1.5px solid var(--line); color: var(--ink); background: #fff; }
.btn-ghost:hover { border-color: var(--brand); color: var(--brand); background: var(--brand-lt); }
.btn-light { background: #fff; color: var(--brand-dk); }
.btn-light:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-outline-light { border: 1.5px solid rgba(255,255,255,.45); color: #fff; }
.btn-outline-light:hover { background: rgba(255,255,255,.12); border-color: #fff; }
.btn-sm { height: 42px; padding: 0 20px; font-size: 14.5px; }
.btn-block { width: 100%; }

.link-arrow { display: inline-flex; align-items: center; gap: 6px; font-weight: 600; color: var(--brand); }
.link-arrow svg { transition: transform .18s ease; }
.link-arrow:hover svg { transform: translateX(4px); }

/* ---------- 5. Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 80;
  background: rgba(255,255,255,.86);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color .2s ease, box-shadow .2s ease;
}
.site-header.is-stuck { border-bottom-color: var(--line); box-shadow: 0 4px 20px rgba(11,27,43,.05); }
.header-inner { height: var(--header-h); display: flex; align-items: center; gap: 32px; }

.brand { display: flex; align-items: center; gap: 11px; font-weight: 800; font-size: 19px; letter-spacing: -.02em; }
.brand-mark { width: 38px; height: 38px; flex: none; }
.brand-sub { display: block; font-size: 11px; font-weight: 600; color: var(--ink-3); letter-spacing: .12em; line-height: 1; margin-top: 3px; }

.nav { margin-left: auto; display: flex; align-items: center; gap: 4px; }
.nav a {
  position: relative; padding: 9px 15px; border-radius: 999px;
  font-size: 15px; font-weight: 600; color: var(--ink-2);
  transition: color .16s ease, background .16s ease;
}
.nav a:hover { color: var(--brand); background: var(--brand-lt); }
.nav a[aria-current="page"] { color: var(--brand); }
.nav a[aria-current="page"]::after {
  content: ""; position: absolute; left: 50%; bottom: 1px; transform: translateX(-50%);
  width: 18px; height: 2.5px; border-radius: 2px; background: var(--grad);
}
.header-cta { display: flex; align-items: center; gap: 10px; }

.nav-toggle {
  display: none; width: 44px; height: 44px; margin-left: auto;
  border-radius: 12px; align-items: center; justify-content: center;
}
.nav-toggle:hover { background: var(--bg-soft); }
.nav-toggle span { display: block; width: 20px; height: 2px; background: var(--ink); border-radius: 2px; position: relative; }
.nav-toggle span::before, .nav-toggle span::after {
  content: ""; position: absolute; left: 0; width: 20px; height: 2px; background: var(--ink); border-radius: 2px;
  transition: transform .22s ease, top .22s ease;
}
.nav-toggle span::before { top: -6px; }
.nav-toggle span::after { top: 6px; }
.nav-open .nav-toggle span { background: transparent; }
.nav-open .nav-toggle span::before { top: 0; transform: rotate(45deg); }
.nav-open .nav-toggle span::after { top: 0; transform: rotate(-45deg); }

/* ---------- 6. Hero ---------- */
.hero { position: relative; overflow: hidden; padding: 76px 0 84px; }
.hero::before {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(720px 420px at 12% -8%, rgba(15,155,110,.10), transparent 62%),
    radial-gradient(620px 420px at 92% 6%, rgba(45,212,160,.10), transparent 60%),
    linear-gradient(180deg, var(--bg-soft), #fff 78%);
  z-index: -1;
}
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center; }
.hero h1 { margin-bottom: 20px; }
.hero .lead { font-size: 18.5px; max-width: 560px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.hero-note { display: flex; align-items: center; gap: 8px; margin-top: 18px; font-size: 13.5px; color: var(--ink-3); }

.hero-stats {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px;
  margin-top: 46px; padding-top: 30px; border-top: 1px dashed var(--line);
}
.hero-stats .n { font-size: 26px; font-weight: 800; letter-spacing: -.02em; }
.hero-stats .n em { font-style: normal; font-size: 15px; color: var(--brand); }
.hero-stats .t { font-size: 13px; color: var(--ink-3); margin-top: 2px; }

.hero-visual { position: relative; }
.hero-visual svg { width: 100%; height: auto; }

.hero-mascot {
  width: 100%; max-width: 460px; height: auto; margin: 0 auto;
  border-radius: var(--r-xl);
  box-shadow: var(--shadow-lg);
  background: linear-gradient(135deg, #0F9B6E 0%, #12B583 60%, #2DD4A0 100%);
}

/* floating answer card over hero visual */
.float-card {
  position: absolute; background: #fff; border: 1px solid var(--line);
  border-radius: var(--r-md); box-shadow: var(--shadow-lg); padding: 13px 16px;
  font-size: 13px; line-height: 1.5; animation: float 6s ease-in-out infinite;
}
.float-card b { color: var(--brand); }
.float-card--a { top: 6%; left: -4%; max-width: 210px; }
.float-card--b { bottom: 8%; right: -2%; max-width: 200px; animation-delay: -3s; }
@keyframes float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }

/* ---------- 7. Trust bar ---------- */
.trust { padding: 30px 0; border-top: 1px solid var(--line-soft); border-bottom: 1px solid var(--line-soft); background: #fff; }
.trust-inner { display: flex; align-items: center; gap: 40px; flex-wrap: wrap; justify-content: space-between; }
.trust-label { font-size: 13.5px; color: var(--ink-3); font-weight: 600; flex: none; }
.trust-items { display: flex; flex-wrap: wrap; gap: 34px; }
.trust-items span { font-size: 15.5px; font-weight: 700; color: var(--ink-3); opacity: .72; letter-spacing: .02em; }

/* ---------- 8. Cards / Grids ---------- */
.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(--r-lg);
  padding: 30px 28px; transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: #D3E0F0; }
.card h3 { margin-bottom: 10px; }
.card p { color: var(--ink-2); font-size: 15.5px; }
.card .card-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
.card .card-tags span { font-size: 12.5px; font-weight: 600; color: var(--ink-3); background: var(--bg-soft); border: 1px solid var(--line); padding: 4px 11px; border-radius: 999px; }

.icon-box {
  width: 52px; height: 52px; border-radius: 14px; display: grid; place-items: center;
  background: var(--brand-lt); color: var(--brand); margin-bottom: 20px;
}
.icon-box--warm { background: #FFF6E5; color: var(--amber-dk); }
.icon-box--green { background: #E6F7F1; color: var(--green); }
.icon-box--violet { background: #F0ECFF; color: var(--violet); }
.icon-box svg { width: 26px; height: 26px; }

.card-num {
  font-size: 13px; font-weight: 800; color: var(--brand);
  letter-spacing: .1em; margin-bottom: 14px; display: block;
}

/* ---------- 9. Split feature ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.split--rev .split-media { order: -1; }
.checklist { display: grid; gap: 14px; margin-top: 26px; }
.checklist li { display: flex; gap: 12px; align-items: flex-start; font-size: 15.5px; color: var(--ink-2); }
.checklist svg { flex: none; width: 18px; height: 18px; margin-top: 4px; color: var(--green); }

.panel {
  background: #fff; border: 1px solid var(--line); border-radius: var(--r-lg);
  padding: 26px; box-shadow: var(--shadow-sm);
}
.panel-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding-bottom: 16px; border-bottom: 1px solid var(--line-soft); margin-bottom: 16px; }
.panel-head b { font-size: 15px; }
.panel-head span { font-size: 12.5px; color: var(--ink-3); }
/* 仅作用于面板内作为主体的示意插图（如首页 SEO/GEO 对比图），
   不能写成 `.panel svg`，否则会覆盖清单里的对勾图标尺寸 */
.panel > svg { width: 100%; height: auto; }

/* ---------- 10. Steps ---------- */
.steps { display: grid; grid-template-columns: repeat(5, 1fr); gap: 18px; counter-reset: step; }
.step { position: relative; padding-top: 26px; }
.step::before {
  content: ""; position: absolute; top: 9px; left: 0; right: 0; height: 2px; background: var(--line);
}
.step:first-child::before { left: 50%; }
.step:last-child::before { right: 50%; }
.step::after {
  content: ""; position: absolute; top: 3px; left: 0; width: 14px; height: 14px;
  border-radius: 50%; background: #fff; border: 3px solid var(--brand); z-index: 1;
}
.step-n { font-size: 12.5px; font-weight: 800; letter-spacing: .12em; color: var(--brand); }
.step h3 { font-size: 17px; margin: 8px 0 8px; }
.step p { font-size: 14.5px; color: var(--ink-3); }

/* ---------- 11. Case cards ---------- */
.case-card {
  display: flex; flex-direction: column; background: #fff;
  border: 1px solid var(--line); border-radius: var(--r-lg); overflow: hidden;
  transition: transform .2s ease, box-shadow .2s ease;
}
.case-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.case-cover { height: 128px; background: var(--grad); position: relative; display: grid; place-items: center; }
.case-cover--warm { background: var(--grad-warm); }
.case-cover--deep { background: linear-gradient(120deg, #0A2540, #0F9B6E); }
.case-cover--green { background: linear-gradient(120deg, #0A7A57, #0F9B6E); }
.case-cover--violet { background: linear-gradient(120deg, #5B3DF5, #9B7CFF); }
.case-cover--slate { background: linear-gradient(120deg, #33475C, #64798F); }
.case-cover span { color: #fff; font-weight: 800; font-size: 17px; letter-spacing: .04em; }
.case-body { padding: 24px; flex: 1; display: flex; flex-direction: column; }
.case-industry { font-size: 12.5px; font-weight: 700; color: var(--brand); letter-spacing: .06em; }
.case-body h3 { font-size: 18.5px; margin: 8px 0 10px; }
.case-body p { font-size: 14.8px; color: var(--ink-2); }
.case-metrics { display: flex; gap: 24px; margin-top: 20px; padding-top: 18px; border-top: 1px dashed var(--line); }
.case-metrics .n { font-size: 22px; font-weight: 800; color: var(--brand); letter-spacing: -.02em; }
.case-metrics .t { font-size: 12.5px; color: var(--ink-3); }

.filters { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin-bottom: 40px; }
.filter-btn {
  padding: 9px 20px; border-radius: 999px; border: 1px solid var(--line);
  font-size: 14.5px; font-weight: 600; color: var(--ink-2); background: #fff;
  transition: all .18s ease;
}
.filter-btn:hover { border-color: var(--brand); color: var(--brand); }
.filter-btn.is-active { background: var(--grad); color: #fff; border-color: transparent; box-shadow: 0 6px 18px rgba(15,155,110,.26); }
.is-hidden { display: none !important; }

/* ---------- 12. Stats band ---------- */
.band { background: var(--bg-deep); color: #fff; position: relative; overflow: hidden; }
.band::before {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(560px 320px at 10% 0%, rgba(15,155,110,.5), transparent 62%),
    radial-gradient(520px 320px at 90% 100%, rgba(45,212,160,.38), transparent 62%);
}
.band .container { position: relative; }
.band h2 { color: #fff; }
.band p { color: rgba(255,255,255,.72); }
.stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 28px; }
.stat-grid .n { font-size: clamp(30px, 3.6vw, 44px); font-weight: 800; letter-spacing: -.03em; background: linear-gradient(120deg,#fff,#9CC0FF); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat-grid .t { font-size: 14.5px; color: rgba(255,255,255,.68); margin-top: 6px; }

/* ---------- 13. Testimonials ---------- */
.quote {
  background: #fff; border: 1px solid var(--line); border-radius: var(--r-lg); padding: 30px 28px;
  display: flex; flex-direction: column; height: 100%;
}
.quote-mark { font-size: 44px; line-height: 1; color: var(--brand-lt); font-weight: 800; }
.quote p { font-size: 15.8px; color: var(--ink-2); margin: 6px 0 22px; flex: 1; }
.quote-who { display: flex; align-items: center; gap: 12px; padding-top: 18px; border-top: 1px solid var(--line-soft); }
.avatar { width: 42px; height: 42px; border-radius: 50%; background: var(--grad); color: #fff; display: grid; place-items: center; font-weight: 700; font-size: 15px; flex: none; }
.quote-who b { display: block; font-size: 14.5px; }
.quote-who span { font-size: 13px; color: var(--ink-3); }

/* ---------- 14. FAQ ---------- */
.faq { max-width: 820px; margin: 0 auto; }
.faq-group-title { font-size: 20px; color: var(--ink); margin: 40px 0 6px; }
.faq-group-title:first-of-type { margin-top: 0; }
.faq-group-sub { font-size: 13.5px; color: var(--ink-3); margin-bottom: 8px; max-width: 820px; margin-left: auto; margin-right: auto; }
.brand .reg { font-size: 10px; font-weight: 600; vertical-align: super; margin-left: 1px; line-height: 1; }
.footer-tm { max-width: 1200px; margin: 0 auto; padding-top: 18px; font-size: 12.5px; color: rgba(255,255,255,.55); line-height: 1.7; }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-q {
  width: 100%; display: flex; align-items: center; gap: 18px; text-align: left;
  padding: 22px 4px; font-size: 17px; font-weight: 600; color: var(--ink);
}
.faq-q:hover { color: var(--brand); }
.faq-q .chev { margin-left: auto; flex: none; color: var(--ink-3); transition: transform .24s ease; }
.faq-item.is-open .faq-q { color: var(--brand); }
.faq-item.is-open .chev { transform: rotate(180deg); color: var(--brand); }
.faq-a { overflow: hidden; max-height: 0; transition: max-height .3s ease; }
.faq-a p { padding: 0 46px 24px 4px; color: var(--ink-2); font-size: 15.6px; }

/* ---------- 15. CTA band ---------- */
.cta-band { background: var(--grad); color: #fff; border-radius: var(--r-xl); padding: 62px 56px; position: relative; overflow: hidden; }
.cta-band::after {
  content: ""; position: absolute; right: -80px; top: -80px; width: 340px; height: 340px;
  border-radius: 50%; background: rgba(255,255,255,.12);
}
.cta-band h2 { color: #fff; max-width: 620px; }
.cta-band p { color: rgba(255,255,255,.85); margin-top: 14px; max-width: 560px; }
.cta-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; position: relative; }

/* ---------- 16. Footer ---------- */
.site-footer { background: #071A2B; color: rgba(255,255,255,.72); padding: 66px 0 28px; margin-top: 0; }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 44px; }
.site-footer .brand { color: #fff; }
.site-footer .brand-sub { color: rgba(255,255,255,.5); }
.footer-about { font-size: 14.5px; margin-top: 18px; max-width: 300px; color: rgba(255,255,255,.6); }
.footer-col h4 { font-size: 14.5px; color: #fff; margin-bottom: 16px; }
.footer-col li { margin-bottom: 11px; }
.footer-col a { font-size: 14.5px; color: rgba(255,255,255,.66); }
.footer-col a:hover { color: #fff; }
.footer-bottom {
  margin-top: 48px; padding-top: 24px; border-top: 1px solid rgba(255,255,255,.1);
  display: flex; flex-wrap: wrap; gap: 14px 28px; justify-content: space-between;
  font-size: 13.5px; color: rgba(255,255,255,.5);
}
.footer-bottom a:hover { color: #fff; }

/* ---------- 17. Page hero (inner pages) ---------- */
.page-hero { padding: 62px 0 58px; background: var(--bg-soft); border-bottom: 1px solid var(--line-soft); }
.page-hero h1 { font-size: clamp(30px, 3.6vw, 46px); max-width: 820px; }
.page-hero p { color: var(--ink-3); font-size: 17.5px; margin-top: 16px; max-width: 700px; }
.crumb { font-size: 13.5px; color: var(--ink-3); margin-bottom: 16px; }
.crumb a:hover { color: var(--brand); }
.crumb span { margin: 0 8px; opacity: .5; }

/* ---------- 18. Forms ---------- */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.field { display: flex; flex-direction: column; gap: 8px; }
.field--full { grid-column: 1 / -1; }
.field label { font-size: 14px; font-weight: 600; color: var(--ink-2); }
.field label em { color: #E5484D; font-style: normal; }
.field input, .field select, .field textarea {
  border: 1px solid var(--line); border-radius: var(--r-sm); background: #fff;
  padding: 13px 15px; font-size: 15px; transition: border-color .16s ease, box-shadow .16s ease;
}
.field textarea { min-height: 128px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--brand); box-shadow: 0 0 0 3px rgba(22,87,224,.12);
}
.form-hint { font-size: 13px; color: var(--ink-3); margin-top: 16px; }
.form-ok {
  display: none; align-items: center; gap: 10px; margin-top: 18px;
  background: #E8F7F1; color: #0A7A57; border-radius: var(--r-sm);
  padding: 13px 16px; font-size: 14.5px; font-weight: 600;
}
.form-ok.is-on { display: flex; }

/* ---------- 19. Contact info list ---------- */
.info-list { display: grid; gap: 22px; }
.info-item { display: flex; gap: 16px; }
.info-item .icon-box { width: 44px; height: 44px; border-radius: 12px; margin: 0; }
.info-item .icon-box svg { width: 21px; height: 21px; }
.qr-code {
  width: 132px; height: auto; margin-top: 10px;
  border-radius: var(--r-sm); border: 1px solid var(--line);
}
.info-item b { display: block; font-size: 15.5px; margin-bottom: 3px; }
.info-item span, .info-item a { font-size: 15px; color: var(--ink-2); }
.info-item a:hover { color: var(--brand); }

/* ---------- 20. Timeline ---------- */
.timeline { position: relative; padding-left: 30px; }
.timeline::before { content: ""; position: absolute; left: 6px; top: 8px; bottom: 8px; width: 2px; background: var(--line); }
.tl-item { position: relative; padding-bottom: 34px; }
.tl-item:last-child { padding-bottom: 0; }
.tl-item::before {
  content: ""; position: absolute; left: -30px; top: 6px; width: 14px; height: 14px;
  border-radius: 50%; background: #fff; border: 3px solid var(--brand);
}
.tl-year { font-size: 13px; font-weight: 800; letter-spacing: .1em; color: var(--brand); }
.tl-item h3 { font-size: 17.5px; margin: 6px 0 6px; }
.tl-item p { font-size: 15px; color: var(--ink-3); }

/* ---------- 21. Value tiles ---------- */
.value-tile { padding: 28px 26px; border-radius: var(--r-lg); background: #fff; border: 1px solid var(--line); }
.value-tile h3 { font-size: 17.5px; margin-bottom: 9px; }
.value-tile p { font-size: 15px; color: var(--ink-3); }

/* ---------- 22. Reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .6s ease, transform .6s ease; }
.reveal.is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .float-card { animation: none; }
  html { scroll-behavior: auto; }
}

/* ---------- 23. Utilities ---------- */
.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; }
.mb-40 { margin-bottom: 40px; }
.center { text-align: center; }
.mx-auto { margin-left: auto; margin-right: auto; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* ---------- 24. Responsive ---------- */
@media (max-width: 1024px) {
  .section { padding: 76px 0; }
  .hero-grid { grid-template-columns: 1fr; gap: 44px; }
  .hero-visual { max-width: 620px; }
  .split { grid-template-columns: 1fr; gap: 40px; }
  .split--rev .split-media { order: 0; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(3, 1fr); row-gap: 34px; }
  .step:nth-child(4)::before { left: 50%; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 34px; }
  .stat-grid { grid-template-columns: repeat(2, 1fr); gap: 34px; }
  .nav, .header-cta { display: none; }
  .nav-toggle { display: flex; }

  .nav-open .nav {
    display: flex; flex-direction: column; align-items: stretch; gap: 2px;
    position: absolute; left: 0; right: 0; top: var(--header-h);
    background: #fff; border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow-md); padding: 14px var(--pad) 22px;
  }
  .nav-open .nav a { padding: 13px 14px; border-radius: 10px; font-size: 16px; }
  .nav-open .nav a[aria-current="page"]::after { display: none; }
  .nav-open .nav a[aria-current="page"] { background: var(--brand-lt); }
}

@media (max-width: 768px) {
  :root { --pad: 20px; }
  .section { padding: 62px 0; }
  .sec-head { margin-bottom: 38px; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 20px; }
  .steps { grid-template-columns: 1fr; gap: 0; }
  .step { padding: 0 0 26px 34px; }
  .step::before { top: 0; bottom: 0; left: 6px; right: auto; width: 2px; height: auto; }
  .step:first-child::before, .step:last-child::before { left: 6px; }
  .step:last-child::before { bottom: auto; height: 12px; }
  .step::after { top: 2px; left: 0; }
  .cta-band { padding: 42px 26px; border-radius: var(--r-lg); }
  .form-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
  .footer-about { max-width: none; }
  .float-card { display: none; }
  .trust-inner { gap: 18px; }
  .trust-items { gap: 20px; }
  .trust-items span { font-size: 14px; }
}

@media (max-width: 480px) {
  .btn { height: 47px; padding: 0 20px; font-size: 15px; }
  .hero-actions .btn { width: 100%; }
  .case-metrics { gap: 18px; }
  .case-metrics .n { font-size: 19px; }
}

/* ---------- 16. 资讯前沿 / 文章页 ---------- */
.post-list { display: grid; gap: 18px; max-width: 860px; }
.post-card {
  display: block; background: #fff; border: 1px solid var(--line);
  border-radius: var(--r-lg); padding: 26px 28px; box-shadow: var(--shadow-sm);
  transition: border-color .18s ease, transform .18s ease;
}
.post-card:hover { border-color: var(--brand); transform: translateY(-2px); }
.post-meta { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; font-size: 12.5px; color: var(--ink-3); margin-bottom: 10px; }
.post-tag { padding: 3px 10px; border-radius: 999px; background: var(--brand-lt); color: var(--brand-dk); font-size: 12px; }
.post-card h3 { font-size: 18px; margin-bottom: 8px; color: var(--ink); }
.post-card p { font-size: 14.5px; color: var(--ink-2); }
.post-more { font-size: 13.5px; color: var(--brand); margin-top: 12px; display: inline-flex; align-items: center; gap: 6px; }
.post-more svg { transition: transform .18s ease; }
.post-card:hover .post-more svg { transform: translateX(4px); }

.article { max-width: 780px; margin: 0 auto; }
.article-head h1 { font-size: clamp(25px, 3.4vw, 33px); line-height: 1.35; }
.article-lead { margin-top: 14px; font-size: 16px; color: var(--ink-3); line-height: 1.8; }
.article-body { margin-top: 36px; display: grid; gap: 16px; font-size: 15.5px; line-height: 1.9; color: var(--ink-2); }
.article-body h2 { font-size: 21px; color: var(--ink); margin-top: 26px; line-height: 1.5; }
.article-body h3 { font-size: 17px; color: var(--ink); margin-top: 16px; }
.article-body ul, .article-body ol { padding-left: 22px; display: grid; gap: 8px; }
.article-body li::marker { color: var(--brand); }
.article-body b { color: var(--ink); }
.article-answer {
  background: var(--brand-lt); border-left: 3px solid var(--brand);
  border-radius: var(--r-sm); padding: 18px 20px; font-size: 15.5px; line-height: 1.85; color: var(--ink);
}
.article-answer b { color: var(--brand-dk); }
.article-note { font-size: 13px; color: var(--ink-3); border-top: 1px dashed var(--line); padding-top: 14px; margin-top: 12px; line-height: 1.8; }
.article-cta { margin-top: 44px; }
.article-nav { display: grid; gap: 12px; margin-top: 36px; }

/* ---------- 17. 资讯前沿：分类筛选 / 文章 FAQ / 表单反馈 ---------- */
.filter-bar { display: flex; flex-wrap: wrap; gap: 9px; margin-bottom: 20px; max-width: 980px; }
.filter-bar .filter-btn { height: 34px; padding: 0 15px; }
.filter-btn em { font-style: normal; opacity: .6; margin-left: 5px; font-size: 12px; font-weight: 700; }
.filter-btn.is-active em { opacity: .92; }
.post-stat { font-size: 13.5px; color: var(--ink-3); margin: 0 0 22px; max-width: 860px; }
.post-stat b { color: var(--brand-dk); font-size: 15px; }
.post-more-wrap { margin-top: 28px; display: flex; justify-content: center; }
.btn-outline { border: 1.5px solid var(--line); background: #fff; color: var(--ink-2); }
.btn-outline:hover { border-color: var(--brand); color: var(--brand); }
.post-card[hidden] { display: none; }

/* 文章底部 FAQ */
.article-faq { margin-top: 42px; }
.article-faq h2 { font-size: 21px; color: var(--ink); margin-bottom: 4px; }
.faq-q .faq-sign { margin-left: auto; flex: none; width: 14px; height: 14px; position: relative; color: var(--ink-3); }
.faq-q .faq-sign::before, .faq-q .faq-sign::after { content: ''; position: absolute; background: currentColor; border-radius: 1px; }
.faq-q .faq-sign::before { left: 0; top: 6px; width: 14px; height: 2px; }
.faq-q .faq-sign::after { left: 6px; top: 0; width: 2px; height: 14px; transition: transform .24s ease; }
.faq-item.is-open .faq-sign { color: var(--brand); }
.faq-item.is-open .faq-sign::after { transform: scaleY(0); }

/* 正文内的图片 / 表格 / 引用 */
.article-body img { max-width: 100%; height: auto; border-radius: var(--r); margin: 6px 0; }
.article-body blockquote { margin: 6px 0; padding: 16px 20px; background: var(--brand-lt); border-left: 3px solid var(--brand); border-radius: var(--r-sm); }
.article-body blockquote p { margin: 0; }
.article-body table { width: 100%; border-collapse: collapse; font-size: 14.5px; margin: 8px 0; }
.article-body th, .article-body td { border: 1px solid var(--line); padding: 10px 12px; text-align: left; }
.article-body th { background: var(--line-soft, #F1F5F8); font-weight: 700; color: var(--ink); }
.article-body a { color: var(--brand); text-decoration: underline; text-underline-offset: 3px; }

/* 表单提交反馈 */
.form-err { display: none; align-items: flex-start; gap: 10px; margin-top: 14px; padding: 14px 16px; background: #FDEEEE; color: #A62B2B; border-radius: var(--r-sm); font-size: 14px; line-height: 1.7; }
.form-err.is-on { display: flex; }

@media (max-width: 768px) {
  .post-card { padding: 20px; }
  .filter-bar { gap: 7px; }
  .filter-bar .filter-btn { height: 32px; padding: 0 12px; font-size: 13px; }
}