/* =========================================================
   询盘云 · RAG SEO 宣传站  —  设计系统
   商务靛蓝 + 橙色 CTA / 现代互联网公司风
   ========================================================= */

:root {
  /* 品牌色 */
  --indigo-900: #1e1b4b;
  --indigo-800: #312e81;
  --indigo-700: #3730a3;
  --indigo-600: #4f46e5;
  --indigo-500: #6366f1;
  --indigo-100: #e0e7ff;
  --indigo-50:  #eef2ff;

  /* 橙色 CTA */
  --orange-600: #ea580c;
  --orange-500: #f97316;
  --orange-400: #fb923c;

  /* 中性 */
  --ink:        #0f172a;
  --slate-700:  #334155;
  --slate-500:  #64748b;
  --slate-400:  #94a3b8;
  --slate-200:  #e2e8f0;
  --slate-100:  #f1f5f9;
  --slate-50:   #f8fafc;
  --white:      #ffffff;

  /* 语义 */
  --bg:         #ffffff;
  --bg-soft:    #f8fafc;
  --text:       #0f172a;
  --text-soft:  #475569;
  --border:     #e7e9f3;

  --radius-sm: 10px;
  --radius:    16px;
  --radius-lg: 24px;
  --radius-xl: 32px;

  --shadow-sm: 0 1px 2px rgba(15,23,42,.06), 0 1px 3px rgba(15,23,42,.08);
  --shadow:    0 10px 30px -12px rgba(30,27,75,.18);
  --shadow-lg: 0 30px 60px -24px rgba(30,27,75,.30);

  --maxw: 1180px;
  --gutter: clamp(20px, 5vw, 40px);

  --font: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", -apple-system,
          BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  --grad-brand: linear-gradient(135deg, #4f46e5 0%, #6366f1 45%, #7c3aed 100%);
  --grad-cta:   linear-gradient(135deg, #fb923c 0%, #f97316 50%, #ea580c 100%);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
h1, h2, h3, h4 { line-height: 1.25; font-weight: 800; letter-spacing: -0.01em; color: var(--ink); }

/* ---------- Layout helpers ---------- */
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding-inline: var(--gutter); }
.section { padding-block: clamp(64px, 9vw, 120px); }
.section--soft { background: var(--bg-soft); }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase;
  color: var(--indigo-600);
  background: var(--indigo-50);
  border: 1px solid var(--indigo-100);
  padding: 6px 14px; border-radius: 999px;
}
.section-head { max-width: 720px; margin: 0 auto 56px; text-align: center; }
.section-head h2 { font-size: clamp(28px, 4vw, 44px); margin: 18px 0 16px; }
.section-head p { color: var(--text-soft); font-size: clamp(16px, 2vw, 18px); }
.text-grad {
  background: var(--grad-brand);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-weight: 700; font-size: 15px; padding: 13px 26px;
  border-radius: 999px; transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn--cta {
  background: var(--grad-cta); color: #fff;
  box-shadow: 0 10px 24px -8px rgba(234,88,12,.55);
}
.btn--cta:hover { transform: translateY(-2px); box-shadow: 0 16px 34px -10px rgba(234,88,12,.6); }
.btn--primary { background: var(--indigo-600); color: #fff; box-shadow: 0 10px 24px -10px rgba(79,70,229,.55); }
.btn--primary:hover { transform: translateY(-2px); background: var(--indigo-700); }
.btn--ghost { background: #fff; color: var(--indigo-700); border: 1.5px solid var(--indigo-100); }
.btn--ghost:hover { border-color: var(--indigo-600); background: var(--indigo-50); }
.btn--light { background: rgba(255,255,255,.12); color: #fff; border: 1.5px solid rgba(255,255,255,.35); }
.btn--light:hover { background: rgba(255,255,255,.2); }
.btn--lg { padding: 16px 34px; font-size: 16px; }

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.72);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color .25s ease, box-shadow .25s ease, background .25s ease;
}
.site-header.scrolled { border-color: var(--border); box-shadow: var(--shadow-sm); }
.nav { display: flex; align-items: center; justify-content: space-between; height: 70px; gap: 24px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 20px; color: var(--ink); }
.brand .logo-mark {
  width: 34px; height: 34px; border-radius: 9px; background: var(--grad-brand);
  display: grid; place-items: center; color: #fff; font-size: 18px; box-shadow: var(--shadow-sm);
}
.brand .logo-mark svg { width: 20px; height: 20px; }
.brand-logo { height: 30px; width: auto; display: block; }
@media (max-width: 480px) { .brand-logo { height: 26px; } }
/* 深色页脚上反白显示 logo */
.site-footer .brand-logo { height: 28px; filter: brightness(0) invert(1); }
.nav-links { display: flex; align-items: center; gap: 30px; }
.nav-links a { font-size: 15px; font-weight: 600; color: var(--slate-700); transition: color .15s ease; }
.nav-links a:hover { color: var(--indigo-600); }
.nav-actions { display: flex; align-items: center; gap: 14px; }
.nav-toggle { display: none; width: 42px; height: 42px; border-radius: 10px; color: var(--ink); }
.nav-toggle svg { width: 24px; height: 24px; }

/* ---------- Hero ---------- */
.hero { position: relative; overflow: hidden; padding-top: clamp(56px, 8vw, 96px); padding-bottom: clamp(64px, 9vw, 110px); }
.hero::before {
  content: ""; position: absolute; inset: 0; z-index: -2;
  background:
    radial-gradient(60% 50% at 15% 0%, rgba(99,102,241,.16), transparent 60%),
    radial-gradient(50% 50% at 92% 12%, rgba(249,115,22,.14), transparent 60%),
    linear-gradient(180deg, #fbfbff 0%, #ffffff 70%);
}
.hero::after {
  content: ""; position: absolute; inset: 0; z-index: -1; opacity: .5;
  background-image:
    linear-gradient(var(--slate-100) 1px, transparent 1px),
    linear-gradient(90deg, var(--slate-100) 1px, transparent 1px);
  background-size: 44px 44px;
  -webkit-mask-image: radial-gradient(70% 60% at 50% 20%, #000 30%, transparent 75%);
  mask-image: radial-gradient(70% 60% at 50% 20%, #000 30%, transparent 75%);
}
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: clamp(32px, 5vw, 72px); align-items: center; }
.hero h1 { font-size: clamp(34px, 5.2vw, 60px); line-height: 1.12; margin: 22px 0 20px; }
.hero p.lead { font-size: clamp(17px, 2.2vw, 20px); color: var(--text-soft); max-width: 560px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 34px; }
.hero-trust { display: flex; flex-wrap: wrap; gap: 22px 30px; margin-top: 38px; color: var(--slate-500); font-size: 14px; }
.hero-trust b { color: var(--ink); font-weight: 800; font-size: 22px; display: block; }

/* Hero visual card */
.hero-visual { position: relative; }
.flow-card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg); padding: 26px; position: relative;
}
.flow-card h4 { font-size: 15px; color: var(--slate-500); font-weight: 700; margin-bottom: 18px; display:flex; align-items:center; gap:8px; }
.flow-step { display: flex; align-items: center; gap: 14px; padding: 14px 16px; border-radius: var(--radius); background: var(--slate-50); margin-bottom: 12px; border: 1px solid var(--border); }
.flow-step:last-child { margin-bottom: 0; }
.flow-step .idx { flex: 0 0 32px; width: 32px; height: 32px; border-radius: 9px; background: var(--grad-brand); color: #fff; font-weight: 800; display: grid; place-items: center; font-size: 14px; }
.flow-step .meta strong { display: block; font-size: 15px; color: var(--ink); }
.flow-step .meta span { font-size: 13px; color: var(--slate-500); }
.flow-badge {
  position: absolute; right: -14px; top: -16px; background: var(--grad-cta); color: #fff;
  font-weight: 800; font-size: 13px; padding: 10px 16px; border-radius: 999px;
  box-shadow: 0 12px 26px -10px rgba(234,88,12,.6); transform: rotate(3deg);
}

/* ---------- Logos / marquee ---------- */
.investors { padding-block: 40px; border-block: 1px solid var(--border); background: #fff; }
.investors p { text-align: center; color: var(--slate-400); font-size: 13px; font-weight: 600; letter-spacing: .05em; margin-bottom: 20px; }
.investor-row { display: flex; flex-wrap: wrap; justify-content: center; gap: 14px 28px; }
.investor-row span { color: var(--slate-500); font-weight: 700; font-size: clamp(14px,1.6vw,17px); opacity: .8; }

/* ---------- Pain points ---------- */
.pain-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.pain-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; box-shadow: var(--shadow-sm); }
.pain-card .q { font-size: 17px; font-weight: 800; color: var(--ink); margin-bottom: 10px; }
.pain-card .q::before { content: "“"; color: var(--orange-500); font-size: 30px; font-weight: 800; margin-right: 4px; vertical-align: -8px; }
.pain-card p { color: var(--text-soft); font-size: 15px; }

/* ---------- Feature cards ---------- */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.feature-card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 32px 28px;
  box-shadow: var(--shadow-sm); transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
  position: relative; overflow: hidden;
}
.feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: var(--indigo-100); }
.feature-card .ico { width: 52px; height: 52px; border-radius: 14px; background: var(--indigo-50); color: var(--indigo-600); display: grid; place-items: center; margin-bottom: 20px; }
.feature-card .ico svg { width: 26px; height: 26px; }
.feature-card h3 { font-size: 19px; margin-bottom: 10px; }
.feature-card p { color: var(--text-soft); font-size: 15px; }

/* ---------- Steps (process) ---------- */
.steps { display: grid; grid-template-columns: repeat(5, 1fr); gap: 18px; counter-reset: step; }
.step {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 26px 22px;
  position: relative; box-shadow: var(--shadow-sm);
}
.step .num {
  width: 40px; height: 40px; border-radius: 11px; background: var(--grad-brand); color: #fff;
  font-weight: 800; display: grid; place-items: center; margin-bottom: 16px; font-size: 16px;
}
.step h4 { font-size: 16px; margin-bottom: 8px; }
.step p { font-size: 14px; color: var(--text-soft); }

/* ---------- Why-trust (split) ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(32px,5vw,64px); align-items: center; }
.trust-list { display: grid; gap: 18px; }
.trust-item { display: flex; gap: 16px; padding: 22px; background: #fff; border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow-sm); }
.trust-item .check { flex: 0 0 28px; width: 28px; height: 28px; border-radius: 50%; background: var(--indigo-600); color: #fff; display: grid; place-items: center; }
.trust-item .check svg { width: 16px; height: 16px; }
.trust-item h4 { font-size: 17px; margin-bottom: 6px; }
.trust-item p { font-size: 14.5px; color: var(--text-soft); }
.panel-quote {
  background: var(--indigo-900); color: #fff; border-radius: var(--radius-lg); padding: 40px;
  box-shadow: var(--shadow-lg); position: relative; overflow: hidden;
}
.panel-quote::before { content:""; position:absolute; right:-60px; top:-60px; width:200px; height:200px; border-radius:50%; background:radial-gradient(circle,rgba(99,102,241,.5),transparent 70%); }
.panel-quote .mark { font-size: 56px; line-height: 1; color: var(--orange-400); font-weight: 800; }
.panel-quote blockquote { font-size: 20px; font-weight: 600; line-height: 1.6; margin: 8px 0 22px; }
.panel-quote cite { color: var(--indigo-100); font-style: normal; font-size: 14px; }

/* ---------- Stats ---------- */
.stats-band { background: var(--grad-brand); color: #fff; border-radius: var(--radius-xl); padding: clamp(36px,5vw,56px); box-shadow: var(--shadow-lg); position: relative; overflow:hidden; }
.stats-band::after { content:""; position:absolute; inset:0; background:radial-gradient(60% 80% at 90% 0,rgba(255,255,255,.16),transparent 60%); }
.stats-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 28px; position: relative; }
.stat .v { font-size: clamp(30px,4.5vw,46px); font-weight: 800; letter-spacing: -.02em; }
.stat .v .u { font-size: .5em; font-weight: 700; margin-left: 2px; }
.stat .l { color: rgba(255,255,255,.82); font-size: 14.5px; margin-top: 6px; }

/* ---------- Case cards ---------- */
.case-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 24px; }
.case-card { background:#fff; border:1px solid var(--border); border-radius: var(--radius-lg); padding: 30px; box-shadow: var(--shadow-sm); transition: transform .2s,box-shadow .2s; }
.case-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); }
.case-card .metric { font-size: clamp(26px,3.6vw,38px); font-weight: 800; color: var(--indigo-600); }
.case-card .metric .text-grad { display:inline; }
.case-card h4 { font-size: 16px; margin: 12px 0 8px; }
.case-card p { font-size: 14.5px; color: var(--text-soft); }

/* ---------- FAQ ---------- */
.faq { max-width: 820px; margin: 0 auto; display: grid; gap: 14px; }
.faq-item { background:#fff; border:1px solid var(--border); border-radius: var(--radius); overflow:hidden; box-shadow: var(--shadow-sm); }
.faq-q { width: 100%; text-align: left; display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 22px 24px; font-size: 16.5px; font-weight: 700; color: var(--ink); }
.faq-q .icn { flex:0 0 auto; width: 26px; height: 26px; border-radius: 50%; background: var(--indigo-50); color: var(--indigo-600); display: grid; place-items: center; transition: transform .25s ease, background .2s; font-size: 18px; font-weight: 700; }
.faq-item.open .faq-q .icn { transform: rotate(45deg); background: var(--indigo-600); color:#fff; }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .3s ease; }
.faq-a p { padding: 0 24px 22px; color: var(--text-soft); font-size: 15px; }

/* ---------- CTA / lead form ---------- */
.cta-section { position: relative; }
.cta-wrap { background: var(--indigo-900); border-radius: var(--radius-xl); padding: clamp(36px,5vw,60px); box-shadow: var(--shadow-lg); position: relative; overflow: hidden; }
.cta-wrap::before { content:""; position:absolute; left:-80px; bottom:-80px; width:280px; height:280px; border-radius:50%; background:radial-gradient(circle,rgba(249,115,22,.35),transparent 65%); }
.cta-wrap::after { content:""; position:absolute; right:-60px; top:-60px; width:240px; height:240px; border-radius:50%; background:radial-gradient(circle,rgba(99,102,241,.5),transparent 65%); }
.cta-grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(28px,4vw,52px); align-items: center; position: relative; }
.cta-copy h2 { color: #fff; font-size: clamp(26px,3.6vw,40px); margin-bottom: 16px; }
.cta-copy p { color: var(--indigo-100); font-size: 16.5px; margin-bottom: 24px; }
.contact-extra { display: grid; gap: 14px; margin-top: 8px; }
.contact-row { display: flex; align-items: center; gap: 14px; color: #fff; }
.contact-row .ci { width: 42px; height: 42px; border-radius: 11px; background: rgba(255,255,255,.12); display: grid; place-items: center; flex:0 0 auto; }
.contact-row .ci svg { width: 20px; height: 20px; }
.contact-row small { display: block; color: var(--indigo-100); font-size: 12.5px; }
.contact-row b { font-size: 15px; font-weight: 700; }
.qr-box { display:flex; gap:16px; align-items:center; background: rgba(255,255,255,.08); border:1px solid rgba(255,255,255,.15); border-radius: var(--radius); padding: 14px; margin-top: 16px; }
.qr-box .qr-img { width: 92px; height: 92px; border-radius: 10px; background:#fff; display:grid; place-items:center; flex:0 0 auto; }
.qr-box .qr-img svg { width: 76px; height: 76px; }
.qr-box .qr-text { color:#fff; } .qr-box .qr-text b{ font-size:15px;} .qr-box .qr-text small{ color: var(--indigo-100); font-size: 12.5px; }

/* Form */
.lead-form { background: #fff; border-radius: var(--radius-lg); padding: clamp(24px,3vw,34px); box-shadow: var(--shadow-lg); }
.lead-form h3 { font-size: 21px; margin-bottom: 4px; }
.lead-form .sub { color: var(--slate-500); font-size: 14px; margin-bottom: 22px; }
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 13.5px; font-weight: 700; color: var(--slate-700); margin-bottom: 7px; }
.field input, .field select, .field textarea {
  width: 100%; padding: 13px 15px; font-size: 15px; font-family: inherit; color: var(--ink);
  background: var(--slate-50); border: 1.5px solid var(--border); border-radius: var(--radius-sm);
  transition: border-color .15s, box-shadow .15s, background .15s;
}
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--indigo-500); background: #fff;
  box-shadow: 0 0 0 4px rgba(99,102,241,.12);
}
.field textarea { resize: vertical; min-height: 84px; }
.form-note { font-size: 12.5px; color: var(--slate-400); margin-top: 12px; text-align: center; }
.form-success { display:none; text-align:center; padding: 30px 10px; }
.form-success .ok { width:64px; height:64px; border-radius:50%; background: var(--indigo-50); color: var(--indigo-600); display:grid; place-items:center; margin: 0 auto 16px; }
.form-success .ok svg { width: 34px; height:34px; }
.form-success h3 { margin-bottom: 8px; }
.form-success p { color: var(--slate-500); font-size: 14.5px; }
.lead-form.sent form { display: none; }
.lead-form.sent .form-success { display: block; }

/* ---------- Footer ---------- */
.site-footer { background: #0c0a26; color: #cbd5e1; padding-top: 64px; }
.footer-top { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 36px; padding-bottom: 44px; border-bottom: 1px solid rgba(255,255,255,.08); }
.footer-brand .brand { color:#fff; margin-bottom: 14px; }
.footer-brand p { font-size: 14px; color: var(--slate-400); max-width: 320px; }
.footer-col h5 { color: #fff; font-size: 14px; margin-bottom: 16px; letter-spacing: .03em; }
.footer-col a { display: block; font-size: 14px; color: var(--slate-400); margin-bottom: 11px; transition: color .15s; }
.footer-col a:hover { color: #fff; }
.footer-bottom { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; padding: 22px 0 30px; font-size: 13px; color: var(--slate-500); }

/* ---------- Reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }

/* =========================================================
   博客 / 文章中心
   ========================================================= */
.page-hero { background: linear-gradient(180deg,#fbfbff,#fff); border-bottom: 1px solid var(--border); padding-block: clamp(48px,7vw,80px); text-align:center; }
.page-hero h1 { font-size: clamp(30px,4.5vw,48px); margin-bottom: 14px; }
.page-hero p { color: var(--text-soft); font-size: 18px; max-width: 640px; margin: 0 auto; }

.blog-toolbar { display:flex; flex-wrap:wrap; gap: 16px; justify-content: space-between; align-items:center; margin-bottom: 30px; }
.cat-filters { display:flex; flex-wrap:wrap; gap: 10px; }
.cat-chip { font-size: 14px; font-weight: 700; color: var(--slate-700); background:#fff; border:1.5px solid var(--border); padding: 8px 16px; border-radius: 999px; transition: all .15s; }
.cat-chip:hover { border-color: var(--indigo-300, #a5b4fc); }
.cat-chip.active { background: var(--indigo-600); color:#fff; border-color: var(--indigo-600); }
.search-box { position: relative; }
.search-box input { padding: 10px 14px 10px 38px; border:1.5px solid var(--border); border-radius: 999px; font-size: 14px; min-width: 220px; background:#fff; }
.search-box input:focus { outline:none; border-color: var(--indigo-500); box-shadow: 0 0 0 4px rgba(99,102,241,.12); }
.search-box svg { position:absolute; left: 13px; top: 50%; transform: translateY(-50%); width: 17px; height:17px; color: var(--slate-400); }

.post-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 26px; }
.post-card { display:flex; flex-direction: column; background:#fff; border:1px solid var(--border); border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-sm); transition: transform .2s, box-shadow .2s; }
.post-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.post-thumb { aspect-ratio: 16/9; background: var(--grad-brand); position: relative; display:grid; place-items:center; overflow:hidden; }
.post-thumb.alt { background: linear-gradient(135deg,#0ea5e9,#6366f1); }
.post-thumb.alt2 { background: linear-gradient(135deg,#f97316,#ea580c); }
.post-thumb.alt3 { background: linear-gradient(135deg,#10b981,#0ea5e9); }
.post-thumb .tag-ico { color:rgba(255,255,255,.9); }
.post-thumb .tag-ico svg { width: 54px; height: 54px; }
.post-body { padding: 24px; display:flex; flex-direction: column; flex:1; }
.post-cat { font-size: 12.5px; font-weight: 800; color: var(--indigo-600); letter-spacing:.04em; text-transform: uppercase; }
.post-card h3 { font-size: 18px; margin: 10px 0 10px; line-height: 1.4; }
.post-card h3 a:hover { color: var(--indigo-600); }
.post-excerpt { font-size: 14.5px; color: var(--text-soft); flex:1; }
.post-meta { display:flex; align-items:center; gap: 10px; margin-top: 18px; font-size: 13px; color: var(--slate-400); }
.empty-state { text-align:center; color: var(--slate-400); padding: 60px 0; font-size: 16px; }

/* =========================================================
   文章详情页 (article)
   ========================================================= */
.article-wrap { max-width: 760px; margin: 0 auto; padding-block: clamp(36px,5vw,60px); }
.breadcrumb { font-size: 13.5px; color: var(--slate-400); margin-bottom: 22px; }
.breadcrumb a:hover { color: var(--indigo-600); }
.article-head h1 { font-size: clamp(28px,4vw,42px); line-height: 1.25; margin: 12px 0 18px; }
.article-meta { display:flex; flex-wrap:wrap; align-items:center; gap: 14px; color: var(--slate-500); font-size: 14px; padding-bottom: 28px; border-bottom: 1px solid var(--border); margin-bottom: 36px; }
.article-meta .pill { background: var(--indigo-50); color: var(--indigo-600); font-weight:700; padding: 4px 12px; border-radius: 999px; font-size: 12.5px; }
.prose { font-size: 17px; line-height: 1.85; color: var(--slate-700); }
.prose h2 { font-size: 26px; margin: 40px 0 16px; color: var(--ink); }
.prose h3 { font-size: 20px; margin: 30px 0 12px; color: var(--ink); }
.prose p { margin-bottom: 20px; }
.prose ul, .prose ol { margin: 0 0 20px 22px; }
.prose li { margin-bottom: 10px; }
.prose strong { color: var(--ink); font-weight: 700; }
.prose blockquote { border-left: 4px solid var(--indigo-500); background: var(--indigo-50); padding: 16px 22px; border-radius: 0 var(--radius-sm) var(--radius-sm) 0; margin: 0 0 24px; color: var(--slate-700); }
.prose a { color: var(--indigo-600); text-decoration: underline; text-underline-offset: 3px; }
.prose .callout { background: var(--slate-50); border:1px solid var(--border); border-radius: var(--radius); padding: 22px 24px; margin: 0 0 24px; }
.prose .callout strong { color: var(--indigo-700); }
.source-note { margin-top: 40px; padding-top: 24px; border-top: 1px solid var(--border); font-size: 13.5px; color: var(--slate-400); }
.article-cta { margin-top: 44px; background: var(--grad-brand); color:#fff; border-radius: var(--radius-lg); padding: 32px; text-align:center; box-shadow: var(--shadow); }
.article-cta h3 { color:#fff; font-size: 22px; margin-bottom: 10px; }
.article-cta p { color: var(--indigo-100); margin-bottom: 20px; }

/* =========================================================
   响应式
   ========================================================= */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-visual { max-width: 460px; }
  .split { grid-template-columns: 1fr; }
  .cta-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: repeat(2,1fr); }
  .stats-grid { grid-template-columns: repeat(2,1fr); }
  .footer-top { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 760px) {
  .nav-links, .nav-actions .btn { display: none; }
  .nav-toggle { display: grid; place-items: center; }
  .site-header.menu-open .nav-links {
    display: flex; flex-direction: column; align-items: stretch; gap: 4px;
    position: absolute; top: 70px; left: 0; right: 0; background:#fff;
    padding: 16px var(--gutter) 24px; border-bottom: 1px solid var(--border); box-shadow: var(--shadow);
  }
  .site-header.menu-open .nav-links a { padding: 12px 4px; border-bottom: 1px solid var(--slate-100); }
  .pain-grid, .feature-grid, .case-grid, .post-grid { grid-template-columns: 1fr; }
  .steps, .stats-grid { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr 1fr; gap: 28px; }
}
@media (max-width: 480px) {
  .footer-top { grid-template-columns: 1fr; }
  .hero-trust { gap: 16px; }
}