/* ============================================================
   擎数智搜 2.0 官网 · 全站样式表
   品牌色：科技蓝 #4F46E5 / 琥珀橙 #F59E0B / 信任绿 #10B981
   背景：#F8FAFC  深色：#1E1B4B
   ============================================================ */

:root {
  --c-primary: #4F46E5;
  --c-primary-dark: #4338CA;
  --c-primary-light: #EEF2FF;
  --c-accent: #F59E0B;
  --c-accent-dark: #D97706;
  --c-success: #10B981;
  --c-success-light: #ECFDF5;
  --c-danger: #EF4444;
  --c-text: #1E293B;
  --c-text-light: #64748B;
  --c-text-muted: #94A3B8;
  --c-border: #E2E8F0;
  --c-bg: #F8FAFC;
  --c-white: #FFFFFF;
  --c-dark: #1E1B4B;
  --c-dark-2: #312E81;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow-sm: 0 1px 3px rgba(30, 27, 75, .06);
  --shadow: 0 8px 24px rgba(30, 27, 75, .08);
  --shadow-lg: 0 16px 48px rgba(30, 27, 75, .14);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Roboto, sans-serif;
  --max-w: 1180px;
}

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

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

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

img { max-width: 100%; height: auto; display: block; }
a { color: var(--c-primary); text-decoration: none; }
a:hover { color: var(--c-primary-dark); }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

h1, h2, h3, h4 { font-weight: 800; line-height: 1.35; color: var(--c-dark); }
h1 { font-size: 2.2rem; }
h2 { font-size: 1.7rem; }
h3 { font-size: 1.25rem; }
p { color: #334155; }

.container { max-width: var(--max-w); margin: 0 auto; padding: 0 20px; }
.section { padding: 72px 0; }
.section--bg { background: var(--c-bg); }
.section--dark { background: linear-gradient(135deg, var(--c-dark) 0%, var(--c-dark-2) 100%); color: #E0E7FF; }
.section--dark h2, .section--dark h3 { color: #fff; }
.section--dark p { color: #C7D2FE; }

.section-head { text-align: center; max-width: 720px; margin: 0 auto 48px; }
.section-head .eyebrow {
  display: inline-block; font-size: .85rem; font-weight: 700; color: var(--c-primary);
  background: var(--c-primary-light); padding: 4px 14px; border-radius: 999px; margin-bottom: 14px;
  letter-spacing: .05em;
}
.section-head h2 { margin-bottom: 12px; }
.section-head p { color: var(--c-text-light); font-size: 1.02rem; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 28px; border-radius: 999px; font-size: 1rem; font-weight: 700;
  transition: all .2s ease; min-height: 48px; white-space: nowrap;
}
.btn:active { transform: scale(.96); }
.btn--primary { background: linear-gradient(135deg, var(--c-primary), var(--c-primary-dark)); color: #fff; box-shadow: 0 6px 18px rgba(79, 70, 229, .35); }
.btn--primary:hover { color: #fff; box-shadow: 0 10px 26px rgba(79, 70, 229, .45); transform: translateY(-2px); }
.btn--accent { background: linear-gradient(135deg, var(--c-accent), var(--c-accent-dark)); color: #fff; box-shadow: 0 6px 18px rgba(245, 158, 11, .35); }
.btn--accent:hover { color: #fff; transform: translateY(-2px); }
.btn--ghost { background: transparent; color: var(--c-primary); border: 2px solid var(--c-primary); }
.btn--ghost:hover { background: var(--c-primary-light); }
.btn--white { background: #fff; color: var(--c-primary); }
.btn--white:hover { color: var(--c-primary-dark); transform: translateY(-2px); }
.btn--sm { padding: 8px 18px; min-height: 38px; font-size: .9rem; }
.btn--block { width: 100%; }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, .92); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--c-border);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.nav-logo { display: flex; align-items: center; gap: 12px; font-weight: 900; font-size: 1.6rem; color: var(--c-dark); letter-spacing: .04em; }
.nav-logo:hover { color: var(--c-dark); }
.nav-logo .logo-img { height: 52px; width: auto; flex-shrink: 0; display: block; }
.nav-logo .logo-text { white-space: nowrap; line-height: 1.1; }
.footer-brand .nav-logo .logo-img { height: 46px; }
.nav-menu { display: flex; align-items: center; gap: 4px; }
.nav-menu a {
  padding: 8px 14px; border-radius: 8px; color: #475569; font-weight: 600; font-size: .95rem;
  transition: all .15s;
}
.nav-menu a:hover { color: var(--c-primary); background: var(--c-primary-light); }
.nav-menu a.active { color: var(--c-primary); }
.nav-cta { margin-left: 12px; background: #DBEAFE !important; color: #1E40AF !important; font-weight: 800 !important; box-shadow: 0 2px 10px rgba(59, 130, 246, .25) !important; border: 1px solid #BFDBFE; }
.nav-cta:hover { background: #BFDBFE !important; color: #1E3A8A !important; transform: none !important; box-shadow: 0 4px 14px rgba(59, 130, 246, .35) !important; }
.nav-toggle { display: none; width: 44px; height: 44px; align-items: center; justify-content: center; }
.nav-toggle span { display: block; width: 24px; height: 2px; background: var(--c-dark); position: relative; border-radius: 2px; }
.nav-toggle span::before, .nav-toggle span::after { content: ""; position: absolute; left: 0; width: 24px; height: 2px; background: var(--c-dark); border-radius: 2px; }
.nav-toggle span::before { top: -8px; }
.nav-toggle span::after { top: 8px; }

/* ---------- 首屏 Hero ---------- */
.hero { background: linear-gradient(160deg, #EEF2FF 0%, #F8FAFC 55%, #FFF7ED 100%); padding: 80px 0 90px; overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 48px; align-items: center; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px; background: #fff; border: 1px solid var(--c-border);
  padding: 7px 16px; border-radius: 999px; font-size: .88rem; font-weight: 600; color: var(--c-primary-dark);
  box-shadow: var(--shadow-sm); margin-bottom: 22px;
}
.hero-badge .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--c-success); }
.hero h1 { font-size: 2.6rem; margin-bottom: 20px; letter-spacing: -.01em; }
.hero h1 .hl { background: linear-gradient(120deg, var(--c-primary), #9333EA); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero .lead { font-size: 1.12rem; color: var(--c-text-light); margin-bottom: 30px; max-width: 560px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 34px; }
.hero-trust { display: flex; gap: 26px; flex-wrap: wrap; font-size: .9rem; color: var(--c-text-light); }
.hero-trust li { display: flex; align-items: center; gap: 7px; }
.hero-trust .check { color: var(--c-success); font-weight: 900; }
.hero-visual { position: relative; }
.hero-visual img { border-radius: var(--radius); box-shadow: var(--shadow-lg); }
.hero-float {
  position: absolute; background: #fff; border-radius: var(--radius-sm); box-shadow: var(--shadow);
  padding: 12px 18px; font-size: .85rem; font-weight: 700; display: flex; align-items: center; gap: 10px;
}
.hero-float .ico { width: 34px; height: 34px; border-radius: 9px; display: flex; align-items: center; justify-content: center; font-size: 1.05rem; }
.hero-float small { display: block; font-weight: 500; color: var(--c-text-muted); font-size: .75rem; }
.hero-float--tl { top: -20px; left: -24px; }
.hero-float--br { bottom: -20px; right: -16px; }

/* ---------- 证据数字 ---------- */
.evidence-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.evidence-card {
  background: #fff; border: 1px solid var(--c-border); border-radius: var(--radius);
  padding: 26px 22px; text-align: center; position: relative; overflow: hidden;
}
.evidence-card::before { content: ""; position: absolute; top: 0; left: 0; right: 0; height: 4px; background: linear-gradient(90deg, var(--c-primary), var(--c-accent)); }
.evidence-card .num { font-size: 2.1rem; font-weight: 900; color: var(--c-primary); line-height: 1.1; }
.evidence-card .num em { font-style: normal; font-size: 1.2rem; color: var(--c-accent-dark); }
.evidence-card .label { font-weight: 700; margin: 6px 0 4px; color: var(--c-dark); }
.evidence-card .desc { font-size: .82rem; color: var(--c-text-muted); }

/* 事实库/营销表达库分区标记 */
.zone-tag {
  display: inline-block; font-size: .72rem; font-weight: 700; padding: 2px 10px; border-radius: 6px;
  letter-spacing: .04em; vertical-align: middle; margin-left: 8px;
}
.zone-fact { background: var(--c-success-light); color: #047857; border: 1px solid #A7F3D0; }
.zone-view { background: #EFF6FF; color: #1D4ED8; border: 1px solid #BFDBFE; }
.zone-mkt { background: #FFFBEB; color: #B45309; border: 1px solid #FDE68A; }

/* ---------- 卡片通用 ---------- */
.card-grid { display: grid; gap: 24px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.card {
  background: #fff; border: 1px solid var(--c-border); border-radius: var(--radius);
  padding: 30px 26px; transition: all .25s ease; display: flex; flex-direction: column;
}
.card:hover { transform: translateY(-5px); box-shadow: var(--shadow); border-color: #C7D2FE; }
.card .card-ico {
  width: 52px; height: 52px; border-radius: 13px; display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem; margin-bottom: 18px; background: var(--c-primary-light);
}
.card h3 { margin-bottom: 10px; }
.card p { font-size: .94rem; color: var(--c-text-light); flex: 1; }
.card .card-link { margin-top: 16px; font-weight: 700; font-size: .92rem; display: inline-flex; align-items: center; gap: 6px; }
.card--accent .card-ico { background: #FEF3C7; }
.card--green .card-ico { background: var(--c-success-light); }

/* ---------- 大模型适配 ---------- */
.model-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px; }
.model-chip {
  background: #fff; border: 1px solid var(--c-border); border-radius: var(--radius-sm);
  padding: 18px 10px; text-align: center; font-weight: 700; font-size: .92rem; color: var(--c-dark);
  transition: all .2s;
}
.model-chip:hover { border-color: var(--c-primary); background: var(--c-primary-light); transform: translateY(-3px); }
.model-chip .m-ico { font-size: 1.5rem; display: block; margin-bottom: 6px; }

/* ---------- 对比区块 ---------- */
.vs-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.vs-col { border-radius: var(--radius); padding: 32px 28px; }
.vs-col--old { background: #F1F5F9; border: 1px solid var(--c-border); }
.vs-col--new { background: linear-gradient(150deg, #EEF2FF, #fff); border: 1px solid #C7D2FE; box-shadow: var(--shadow); }
.vs-col h3 { margin-bottom: 18px; display: flex; align-items: center; gap: 10px; }
.vs-col li { padding: 9px 0 9px 30px; position: relative; font-size: .95rem; color: #475569; border-bottom: 1px dashed var(--c-border); }
.vs-col li:last-child { border-bottom: none; }
.vs-col--old li::before { content: "✕"; position: absolute; left: 2px; color: var(--c-danger); font-weight: 800; }
.vs-col--new li::before { content: "✓"; position: absolute; left: 2px; color: var(--c-success); font-weight: 800; }

/* ---------- 流程步骤 ---------- */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; counter-reset: step; }
.step { background: #fff; border: 1px solid var(--c-border); border-radius: var(--radius); padding: 28px 24px; position: relative; }
.step::after {
  content: counter(step); counter-increment: step;
  position: absolute; top: -18px; left: 24px; width: 38px; height: 38px; border-radius: 50%;
  background: linear-gradient(135deg, var(--c-primary), #7C3AED); color: #fff;
  display: flex; align-items: center; justify-content: center; font-weight: 900; font-size: 1.05rem;
  box-shadow: 0 4px 12px rgba(79, 70, 229, .35);
}
.step h3 { font-size: 1.05rem; margin: 12px 0 8px; }
.step p { font-size: .9rem; color: var(--c-text-light); }
.step .deliver { margin-top: 12px; font-size: .8rem; color: var(--c-primary-dark); background: var(--c-primary-light); padding: 6px 12px; border-radius: 8px; display: inline-block; }

/* ---------- 时间轴 ---------- */
.timeline { position: relative; max-width: 820px; margin: 0 auto; padding-left: 36px; }
.timeline::before { content: ""; position: absolute; left: 10px; top: 6px; bottom: 6px; width: 3px; background: linear-gradient(var(--c-primary), var(--c-accent)); border-radius: 3px; }
.tl-item { position: relative; margin-bottom: 38px; }
.tl-item::before {
  content: ""; position: absolute; left: -33px; top: 6px; width: 15px; height: 15px; border-radius: 50%;
  background: #fff; border: 4px solid var(--c-primary);
}
.tl-date { font-weight: 900; color: var(--c-primary); font-size: 1.02rem; }
.tl-item h3 { font-size: 1.1rem; margin: 4px 0 8px; }
.tl-item p { font-size: .93rem; color: var(--c-text-light); }

/* ---------- FAQ ---------- */
.faq-list { max-width: 860px; margin: 0 auto; }
.faq-item { background: #fff; border: 1px solid var(--c-border); border-radius: var(--radius-sm); margin-bottom: 14px; overflow: hidden; }
.faq-q {
  width: 100%; display: flex; justify-content: space-between; align-items: center; gap: 16px;
  padding: 20px 24px; font-size: 1.02rem; font-weight: 700; color: var(--c-dark); text-align: left; min-height: 44px;
}
.faq-q .faq-icon { flex-shrink: 0; width: 26px; height: 26px; border-radius: 50%; background: var(--c-primary-light); color: var(--c-primary); display: flex; align-items: center; justify-content: center; font-size: 1.1rem; transition: transform .25s; }
.faq-item.open .faq-icon { transform: rotate(45deg); background: var(--c-primary); color: #fff; }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .3s ease; }
.faq-a-inner { padding: 0 24px 22px; color: var(--c-text-light); font-size: .95rem; }
.faq-a-inner strong { color: var(--c-dark); }

/* ---------- 表单 ---------- */
.form-card { background: #fff; border: 1px solid var(--c-border); border-radius: var(--radius); padding: 36px; box-shadow: var(--shadow-sm); }
.jinshuju-wrapper { padding: 0; overflow: hidden; }
.jinshuju-frame { display: block; width: 100%; min-height: 640px; border: none; background: #fff; }
.jinshuju-fallback { text-align: center; padding: 24px; background: var(--c-bg); border-top: 1px solid var(--c-border); }
.jinshuju-fallback p { font-size: .9rem; color: var(--c-text-light); margin: 0; }
.jinshuju-fallback a { color: var(--c-primary); font-weight: 700; }
.form-row { margin-bottom: 20px; }
.form-row label { display: block; font-weight: 700; margin-bottom: 7px; font-size: .94rem; color: var(--c-dark); }
.form-row label .req { color: var(--c-danger); }
.form-row input, .form-row select, .form-row textarea {
  width: 100%; padding: 12px 14px; border: 1.5px solid var(--c-border); border-radius: var(--radius-sm);
  font-size: 1rem; font-family: inherit; color: var(--c-text); background: #fff; transition: border-color .15s;
  min-height: 48px;
}
.form-row textarea { min-height: 120px; resize: vertical; }
.form-row input:focus, .form-row select:focus, .form-row textarea:focus { outline: none; border-color: var(--c-primary); box-shadow: 0 0 0 3px rgba(79, 70, 229, .12); }
.form-check { display: flex; gap: 10px; align-items: flex-start; font-size: .88rem; color: var(--c-text-light); }
.form-check input { width: 18px; height: 18px; margin-top: 4px; flex-shrink: 0; min-height: 0; }
.form-toast {
  display: none; margin-top: 16px; padding: 14px 18px; border-radius: var(--radius-sm);
  background: var(--c-success-light); color: #047857; font-weight: 600; border: 1px solid #A7F3D0;
}
.form-toast.show { display: block; }

/* ---------- 面包屑 ---------- */
.breadcrumb { padding: 18px 0; font-size: .88rem; color: var(--c-text-muted); }
.breadcrumb ol { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.breadcrumb li::after { content: "/"; margin-left: 8px; color: var(--c-border); }
.breadcrumb li:last-child::after { content: ""; }
.breadcrumb li:last-child { color: var(--c-text-light); font-weight: 600; }

/* ---------- 页面横幅（内页） ---------- */
.page-hero { background: linear-gradient(135deg, var(--c-dark), var(--c-dark-2)); color: #fff; padding: 64px 0 56px; text-align: center; }
.page-hero h1 { color: #fff; font-size: 2.1rem; margin-bottom: 14px; }
.page-hero p { color: #C7D2FE; max-width: 680px; margin: 0 auto; font-size: 1.05rem; }

/* ---------- 案例 ---------- */
.case-card { background: #fff; border: 1px solid var(--c-border); border-radius: var(--radius); overflow: hidden; transition: all .25s; display: flex; flex-direction: column; }
.case-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); }
.case-card .case-body { padding: 26px; flex: 1; display: flex; flex-direction: column; }
.case-tag { display: inline-block; font-size: .78rem; font-weight: 700; color: var(--c-primary-dark); background: var(--c-primary-light); padding: 3px 12px; border-radius: 999px; margin-bottom: 12px; align-self: flex-start; }
.case-card h3 { font-size: 1.12rem; margin-bottom: 10px; }
.case-metrics { display: flex; gap: 18px; margin: 16px 0; flex-wrap: wrap; }
.case-metrics .m { flex: 1; min-width: 90px; background: var(--c-bg); border-radius: var(--radius-sm); padding: 12px; text-align: center; }
.case-metrics .m b { display: block; font-size: 1.35rem; font-weight: 900; color: var(--c-primary); }
.case-metrics .m span { font-size: .75rem; color: var(--c-text-muted); }
.case-note { font-size: .78rem; color: var(--c-text-muted); margin-top: auto; padding-top: 12px; border-top: 1px dashed var(--c-border); }

/* ---------- 表格/参数 ---------- */
.data-table { width: 100%; border-collapse: collapse; background: #fff; border-radius: var(--radius-sm); overflow: hidden; font-size: .93rem; }
.data-table caption { text-align: left; font-weight: 700; padding: 12px 16px; background: var(--c-primary-light); color: var(--c-dark); }
.data-table th, .data-table td { padding: 13px 16px; border: 1px solid var(--c-border); text-align: left; }
.data-table th { background: var(--c-bg); font-weight: 700; color: var(--c-dark); white-space: nowrap; }

/* ---------- 引用/来源 ---------- */
.source-note { font-size: .82rem; color: var(--c-text-muted); padding: 10px 14px; background: var(--c-bg); border-left: 3px solid var(--c-accent); border-radius: 0 8px 8px 0; margin: 14px 0; }
.source-note cite { font-style: normal; font-weight: 600; color: var(--c-text-light); }
.disclaimer { font-size: .85rem; color: var(--c-text-muted); background: #FFFBEB; border: 1px solid #FDE68A; border-radius: var(--radius-sm); padding: 14px 18px; margin: 20px 0; }

/* ---------- CTA 横幅 ---------- */
.cta-banner {
  background: linear-gradient(120deg, var(--c-primary), #7C3AED 60%, var(--c-accent));
  border-radius: var(--radius); padding: 52px 40px; text-align: center; color: #fff;
}
.cta-banner h2 { color: #fff; font-size: 1.8rem; margin-bottom: 12px; }
.cta-banner p { color: rgba(255,255,255,.9); margin-bottom: 26px; font-size: 1.05rem; }
.cta-banner .btn { margin: 0 8px 10px; }
.cta-phone { font-size: 1.5rem; font-weight: 900; letter-spacing: .02em; }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--c-dark); color: #C7D2FE; padding: 60px 0 0; font-size: .9rem; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 36px; padding-bottom: 40px; }
.footer-brand .nav-logo { color: #fff; margin-bottom: 16px; }
.footer-brand p { color: #A5B4FC; font-size: .88rem; margin-bottom: 14px; }
.footer-col h4 { color: #fff; font-size: .98rem; margin-bottom: 16px; }
.footer-col li { margin-bottom: 10px; }
.footer-col a { color: #A5B4FC; font-size: .88rem; }
.footer-col a:hover { color: #fff; }
.footer-contact li { display: flex; gap: 9px; color: #A5B4FC; font-size: .88rem; margin-bottom: 10px; align-items: flex-start; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.1); padding: 22px 0; }
.footer-bottom .inner { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; font-size: .8rem; color: #818CF8; }
.footer-bottom a { color: #818CF8; }
.compliance { font-size: .78rem; color: #818CF8; line-height: 1.8; margin-top: 14px; padding-top: 14px; border-top: 1px dashed rgba(255,255,255,.12); }
.compliance p { color: #818CF8; }

/* ---------- 智能问答助手（Agent RAG） ---------- */
.assistant-fab {
  position: fixed; right: 24px; bottom: 24px; z-index: 200;
  width: 60px; height: 60px; border-radius: 50%;
  background: linear-gradient(135deg, var(--c-primary), #7C3AED);
  color: #fff; font-size: 1.6rem; display: flex; align-items: center; justify-content: center;
  box-shadow: 0 10px 30px rgba(79, 70, 229, .45); transition: transform .2s;
}
.assistant-fab:hover { transform: scale(1.08); }
.assistant-fab .fab-dot { position: absolute; top: 4px; right: 4px; width: 14px; height: 14px; border-radius: 50%; background: var(--c-accent); border: 2px solid #fff; }
.assistant-panel {
  position: fixed; right: 24px; bottom: 96px; z-index: 201;
  width: min(400px, calc(100vw - 32px)); height: 580px; max-height: calc(100vh - 140px);
  background: #fff; border-radius: var(--radius); box-shadow: var(--shadow-lg);
  display: none; flex-direction: column; overflow: hidden; border: 1px solid var(--c-border);
}
.assistant-panel.open { display: flex; }
.assistant-head { background: linear-gradient(135deg, var(--c-dark), var(--c-primary)); color: #fff; padding: 16px 18px; display: flex; align-items: center; gap: 12px; }
.assistant-head .a-avatar { width: 40px; height: 40px; border-radius: 11px; background: rgba(255,255,255,.18); display: flex; align-items: center; justify-content: center; font-size: 1.25rem; }
.assistant-head h3 { color: #fff; font-size: 1rem; }
.assistant-head p { font-size: .75rem; color: #C7D2FE; }
.assistant-head .a-close { margin-left: auto; color: #C7D2FE; font-size: 1.3rem; width: 36px; height: 36px; border-radius: 8px; }
.assistant-head .a-close:hover { background: rgba(255,255,255,.12); color: #fff; }
.assistant-body { flex: 1; overflow-y: auto; padding: 18px; background: var(--c-bg); }
.a-msg { margin-bottom: 14px; display: flex; gap: 9px; }
.a-msg .bubble { max-width: 82%; padding: 11px 15px; border-radius: 14px; font-size: .9rem; line-height: 1.65; }
.a-msg.bot .bubble { background: #fff; border: 1px solid var(--c-border); border-top-left-radius: 4px; }
.a-msg.user { flex-direction: row-reverse; }
.a-msg.user .bubble { background: var(--c-primary); color: #fff; border-top-right-radius: 4px; }
.a-msg .rec-links { margin-top: 8px; display: flex; flex-direction: column; gap: 6px; }
.a-msg .rec-links a { font-size: .82rem; font-weight: 700; background: var(--c-primary-light); padding: 5px 11px; border-radius: 8px; display: inline-block; }
.a-quick { display: flex; flex-wrap: wrap; gap: 8px; padding: 10px 18px 0; background: var(--c-bg); }
.a-quick button { font-size: .8rem; padding: 6px 13px; border-radius: 999px; border: 1px solid var(--c-border); background: #fff; color: var(--c-primary-dark); font-weight: 600; min-height: 34px; }
.a-quick button:hover { background: var(--c-primary-light); border-color: var(--c-primary); }
.assistant-input { display: flex; gap: 8px; padding: 12px 14px; border-top: 1px solid var(--c-border); background: #fff; }
.assistant-input input { flex: 1; border: 1.5px solid var(--c-border); border-radius: 999px; padding: 10px 16px; font-size: .92rem; min-height: 44px; font-family: inherit; }
.assistant-input input:focus { outline: none; border-color: var(--c-primary); }
.assistant-input button { width: 46px; height: 44px; border-radius: 50%; background: var(--c-primary); color: #fff; font-size: 1.05rem; flex-shrink: 0; }
.assistant-input button:active { transform: scale(.94); }
.a-typing { color: var(--c-text-muted); font-size: .85rem; padding: 4px 2px; }
.a-foot-note { font-size: .7rem; color: var(--c-text-muted); text-align: center; padding: 6px; background: var(--c-bg); }

/* ---------- 文章正文 ---------- */
.article { max-width: 820px; margin: 0 auto; }
.article-meta { display: flex; gap: 18px; flex-wrap: wrap; color: var(--c-text-muted); font-size: .88rem; margin-bottom: 26px; padding-bottom: 18px; border-bottom: 1px solid var(--c-border); }
.article h2 { font-size: 1.45rem; margin: 36px 0 14px; }
.article h3 { font-size: 1.15rem; margin: 26px 0 10px; }
.article p { margin-bottom: 16px; }
.article ul, .article ol { margin: 0 0 16px 4px; }
.article ul li { padding-left: 22px; position: relative; margin-bottom: 8px; }
.article ul li::before { content: "•"; position: absolute; left: 4px; color: var(--c-primary); font-weight: 900; }
.article ol { counter-reset: ol; }
.article ol li { padding-left: 30px; position: relative; margin-bottom: 10px; counter-increment: ol; }
.article ol li::before { content: counter(ol); position: absolute; left: 0; top: 2px; width: 21px; height: 21px; border-radius: 50%; background: var(--c-primary-light); color: var(--c-primary-dark); font-size: .78rem; font-weight: 800; display: flex; align-items: center; justify-content: center; }

/* ---------- 团队 ---------- */
.team-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.team-card { background: #fff; border: 1px solid var(--c-border); border-radius: var(--radius); padding: 32px 26px; text-align: center; }
.team-avatar { width: 84px; height: 84px; margin: 0 auto 18px; border-radius: 50%; background: linear-gradient(135deg, var(--c-primary-light), #FEF3C7); display: flex; align-items: center; justify-content: center; font-size: 2rem; }
.team-card h3 { font-size: 1.08rem; }
.team-card .pos { color: var(--c-primary); font-weight: 700; font-size: .9rem; margin-bottom: 10px; }
.team-card p { font-size: .88rem; color: var(--c-text-light); text-align: left; }

/* ---------- 工具类 ---------- */
.text-center { text-align: center; }
.mt-20 { margin-top: 20px; } .mt-30 { margin-top: 30px; } .mt-40 { margin-top: 40px; }
.mb-20 { margin-bottom: 20px; } .mb-30 { margin-bottom: 30px; } .mb-40 { margin-bottom: 40px; }
.badge { display: inline-block; padding: 3px 12px; border-radius: 999px; font-size: .78rem; font-weight: 700; }
.badge--green { background: var(--c-success-light); color: #047857; }
.badge--blue { background: var(--c-primary-light); color: var(--c-primary-dark); }
.badge--amber { background: #FEF3C7; color: #B45309; }
.contact-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.contact-item { background: #fff; border: 1px solid var(--c-border); border-radius: var(--radius); padding: 26px; text-align: center; }
.contact-item .c-ico { font-size: 1.7rem; margin-bottom: 10px; }
.contact-item h3 { font-size: 1rem; margin-bottom: 6px; }
.contact-item p { color: var(--c-primary-dark); font-weight: 700; word-break: break-all; }
.sitemap-list { list-style: none; margin: 12px 0 0; }
.sitemap-list li { margin-bottom: 10px; }
.sitemap-list a { color: var(--c-text-light); font-size: .92rem; }
.sitemap-list a:hover { color: var(--c-primary); }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .evidence-grid { grid-template-columns: repeat(2, 1fr); }
  .model-grid { grid-template-columns: repeat(3, 1fr); }
  .team-grid, .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero h1 { font-size: 2.1rem; }
}
@media (max-width: 768px) {
  .section { padding: 52px 0; }
  h1 { font-size: 1.75rem; }
  h2 { font-size: 1.4rem; }
  .hero { padding: 48px 0 60px; }
  .hero h1 { font-size: 1.75rem; }
  .hero-grid, .vs-grid, .grid-2, .grid-3, .team-grid, .steps, .contact-grid, .footer-grid { grid-template-columns: 1fr; }
  .model-grid { grid-template-columns: repeat(2, 1fr); }
  .evidence-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .evidence-card { padding: 20px 14px; }
  .evidence-card .num { font-size: 1.6rem; }
  .nav-menu {
    position: fixed; top: 72px; left: 0; right: 0; background: #fff; flex-direction: column;
    align-items: stretch; padding: 12px 20px 24px; gap: 2px; border-bottom: 1px solid var(--c-border);
    box-shadow: var(--shadow); display: none;
  }
  .nav-menu.open { display: flex; }
  .nav-menu a { padding: 13px 14px; font-size: 1rem; min-height: 48px; display: flex; align-items: center; }
  .nav-cta { margin: 10px 0 0; }
  .nav-toggle { display: flex; }
  .nav-logo { font-size: 1.3rem; gap: 8px; }
  .nav-logo .logo-img { height: 38px; }
  .hero-float--tl { left: 0; }
  .hero-float--br { right: 0; }
  .cta-banner { padding: 38px 22px; }
  .cta-banner h2 { font-size: 1.4rem; }
  .form-card { padding: 24px 18px; }
  .footer-grid { gap: 26px; }
  .footer-bottom .inner { flex-direction: column; }
  .assistant-fab { right: 16px; bottom: 16px; }
  .assistant-panel { right: 16px; bottom: 88px; }
}