:root{
  --bg:#f4f6f9;
  --paper:#ffffff;
  --paper-soft:#fafbfd;
  --text:#172033;
  --muted:#667286;
  --line:#dde3ec;
  --line-dark:#cbd4e1;
  --accent:#315fce;
  --accent-dark:#244ca8;
  --accent-soft:#eaf1ff;
  --accent-pale:#f2f6ff;
  --green:#28765b;
  --green-soft:#eaf6f1;
  --amber:#8b611f;
  --amber-soft:#fff7e8;
  --rose:#a34a56;
  --rose-soft:#fceff1;
  --shadow:0 14px 40px rgba(24,40,70,.07);
  --max:1160px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  color:var(--text);
  background:
    radial-gradient(circle at 8% 0%,rgba(49,95,206,.05),transparent 30rem),
    var(--bg);
  font-family:Inter,"SF Pro Text","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  line-height:1.66;
  letter-spacing:.003em;
}
body.lock{overflow:hidden}
a{color:inherit;text-decoration:none}
button,input,textarea{font:inherit}
button{cursor:pointer}
button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible{
  outline:3px solid rgba(49,95,206,.22);
  outline-offset:2px;
}
.shell{width:min(calc(100% - 40px),var(--max));margin-inline:auto}
.topbar{
  position:sticky;top:0;z-index:60;
  border-bottom:1px solid rgba(203,212,225,.82);
  background:rgba(244,246,249,.9);
  backdrop-filter:blur(18px);
}
.topbar-inner{height:62px;display:flex;align-items:center;justify-content:space-between;gap:22px}
.brand{display:flex;align-items:center;gap:10px;font-weight:750;letter-spacing:-.025em}
.brand-mark{width:33px;height:33px;border-radius:10px;display:grid;place-items:center;background:var(--accent);color:#fff;font-size:12px}
.brand-path{font-size:13px;color:var(--muted);font-weight:560;letter-spacing:0}
.nav{display:flex;align-items:center;gap:5px}
.nav a,.nav button{
  padding:8px 10px;border:1px solid transparent;border-radius:9px;
  background:transparent;color:var(--muted);font-size:13px;
}
.nav a.active{background:var(--paper);border-color:var(--line);color:var(--text)}
.nav button{background:var(--paper);border-color:var(--line)}
.progress{position:fixed;top:62px;left:0;z-index:62;height:2px;width:0;background:var(--accent)}
.page-hero{padding:38px 0 24px}
.eyebrow{display:flex;align-items:center;gap:8px;color:var(--accent);font-size:12px;font-weight:760;letter-spacing:.1em;text-transform:uppercase}
.eyebrow::before{content:"";width:7px;height:7px;border-radius:999px;background:var(--accent)}
h1{
  margin:9px 0 0;
  max-width:820px;
  font-size:clamp(30px,4vw,42px);
  line-height:1.16;
  letter-spacing:-.042em;
  font-weight:760;
}
.hero-meta{display:flex;flex-wrap:wrap;align-items:center;gap:7px;margin-top:12px;color:var(--muted);font-size:13px}
.meta-dot{width:3px;height:3px;border-radius:50%;background:#a7b0bf}
.hero-desc{max-width:760px;margin:10px 0 0;color:#4e5b70;font-size:15px}
.demo-note{display:inline-flex;align-items:center;gap:8px;margin-top:14px;color:var(--amber);font-size:12px}
.demo-note strong{padding:2px 7px;border-radius:999px;background:var(--amber-soft);font-size:10px;letter-spacing:.08em}
.brief{
  margin:0 0 36px;
  padding:20px 22px 21px;
  border:1px solid #d4e0f7;
  border-radius:17px;
  background:linear-gradient(145deg,#f4f7ff,#edf3ff);
}
.brief-head{display:flex;align-items:baseline;justify-content:space-between;gap:16px;margin-bottom:14px}
.brief-head h2{margin:0;font-size:20px;letter-spacing:-.025em}
.brief-head span{color:var(--muted);font-size:12px}
.brief-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.brief-item{
  display:grid;grid-template-columns:27px 1fr;gap:9px;align-items:start;
  padding-right:12px;border-right:1px solid rgba(49,95,206,.13);
}
.brief-item:last-child{border-right:0;padding-right:0}
.brief-no{
  width:25px;height:25px;border-radius:999px;display:grid;place-items:center;
  color:var(--accent);background:var(--paper);border:1px solid #d5e1f8;
  font-size:10px;font-weight:760;
}
.brief-item p{margin:0;color:#344259;font-size:13px}
.section-head{display:flex;align-items:end;justify-content:space-between;gap:18px;margin-bottom:14px}
.section-head h2{margin:0;font-size:25px;line-height:1.25;letter-spacing:-.035em}
.section-head p{margin:4px 0 0;color:var(--muted);font-size:13px}
.section-kicker{color:var(--accent);font-size:11px;font-weight:760;letter-spacing:.11em;text-transform:uppercase}
.featured{margin-bottom:42px}
.feature-layout{display:grid;grid-template-columns:minmax(0,1.45fr) minmax(280px,.78fr);gap:14px}
.feature-main,.feature-small{
  border:1px solid var(--line);
  border-radius:17px;
  background:var(--paper);
  transition:transform .18s ease,border-color .18s ease,box-shadow .18s ease;
}
.feature-main:hover,.feature-small:hover{transform:translateY(-2px);border-color:#b9c7dc;box-shadow:var(--shadow)}
.feature-main{
  min-height:330px;padding:25px;
  display:flex;flex-direction:column;
  border-color:#cfdcf4;background:linear-gradient(145deg,#f3f7ff,#eaf1ff);
}
.feature-side{display:grid;gap:14px}
.feature-small{min-height:158px;padding:19px;display:flex;flex-direction:column}
.feature-rank{display:flex;align-items:center;gap:8px;color:var(--accent);font-size:11px;font-weight:770;letter-spacing:.08em}
.feature-rank .pill{padding:3px 7px;border-radius:999px;background:var(--paper)}
.feature-main h3{margin:31px 0 8px;font-size:25px;line-height:1.4;letter-spacing:-.026em}
.feature-small h3{margin:17px 0 7px;font-size:17px;line-height:1.42;letter-spacing:-.018em}
.feature-summary{margin:0;color:#415069;font-size:14px}
.feature-why{margin:16px 0 0;padding-top:14px;border-top:1px solid rgba(49,95,206,.16);color:#33435d;font-size:13px}
.feature-meta{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:auto;padding-top:18px;color:var(--muted);font-size:12px}
.feature-link{color:var(--accent);font-weight:680}
.mobile-category-bar{
  display:none;position:sticky;top:64px;z-index:45;
  padding:9px 0;background:linear-gradient(var(--bg) 72%,rgba(244,246,249,0));
}
.mobile-category-scroll{display:flex;gap:7px;overflow-x:auto;padding:1px 1px 9px;scrollbar-width:none}
.mobile-category-scroll::-webkit-scrollbar{display:none}
.mobile-category-link{flex:0 0 auto;padding:7px 11px;border:1px solid var(--line);border-radius:999px;background:var(--paper);color:var(--muted);font-size:12px}
.mobile-category-link.active{background:var(--accent);border-color:var(--accent);color:#fff}
.content-layout{display:grid;grid-template-columns:minmax(0,1fr) 220px;gap:38px;align-items:start}
.feed{min-width:0}
.category-section{scroll-margin-top:96px;margin-bottom:39px}
.category-header{
  display:flex;align-items:flex-start;justify-content:space-between;gap:15px;
  padding-bottom:12px;border-bottom:1px solid var(--line-dark);
}
.category-title{display:flex;align-items:flex-start;gap:12px}
.category-index{
  width:29px;height:29px;border-radius:8px;display:grid;place-items:center;
  background:var(--accent-soft);color:var(--accent);font-size:11px;font-weight:760;
}
.category-header h2{margin:0;font-size:21px;line-height:1.35;letter-spacing:-.024em}
.category-header p{margin:3px 0 0;color:var(--muted);font-size:12px}
.category-count{padding-top:4px;color:var(--muted);font-size:12px;white-space:nowrap}
.story-stack{
  margin-top:13px;
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:15px;
  background:var(--paper);
}
.story{border-bottom:1px solid var(--line)}
.story:last-child{border-bottom:0}
.story-main{padding:18px 19px}
.story-top{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:9px}
.story-tags{display:flex;flex-wrap:wrap;gap:6px}
.tag{
  padding:3px 8px;border-radius:999px;
  background:var(--paper-soft);border:1px solid var(--line);
  color:var(--muted);font-size:10px;
}
.tag.evidence{background:var(--green-soft);border-color:transparent;color:var(--green)}
.tag.important{background:var(--rose-soft);border-color:transparent;color:var(--rose)}
.story-time{color:var(--muted);font-size:11px;white-space:nowrap}
.story h3{margin:0;font-size:17px;line-height:1.48;letter-spacing:-.016em}
.story-original{margin:5px 0 0;color:#7a8495;font-size:11px;line-height:1.52}
.story-summary{margin:10px 0 0;color:#46536a;font-size:13px}
.story-footer{
  display:flex;align-items:center;justify-content:space-between;gap:14px;
  margin-top:14px;padding-top:12px;border-top:1px solid #edf0f4;
}
.source-line{display:flex;align-items:center;gap:7px;color:var(--muted);font-size:11px;min-width:0}
.source-dot{width:6px;height:6px;border-radius:50%;background:var(--green);flex:0 0 auto}
.actions{display:flex;align-items:center;gap:9px}
.link-btn,.source-link{
  padding:4px 1px;border:0;background:transparent;color:var(--accent);
  font-size:11px;font-weight:680;
}
.source-link{color:var(--muted)}
.ask-btn{
  padding:7px 10px;border:1px solid var(--accent);border-radius:8px;
  background:var(--accent);color:#fff;font-size:11px;font-weight:690;
}
.story-detail{display:none;padding:17px 19px;border-top:1px solid var(--line);background:var(--paper-soft)}
.story.open .story-detail{display:block}
.interpretation{display:grid;gap:11px}
.interpret-row{display:grid;grid-template-columns:105px 1fr;gap:14px}
.interpret-label{color:var(--accent);font-size:11px;font-weight:740}
.interpret-row p{margin:0;font-size:13px}
.research-nav{display:flex;flex-wrap:wrap;gap:7px;margin:13px 0 9px}
.research-chip{padding:6px 9px;border:1px solid var(--line);border-radius:999px;background:var(--paper);color:var(--muted);font-size:11px}
.research-chip strong{color:var(--text)}
.research-groups{display:grid;gap:13px}
.research-group{scroll-margin-top:100px}
.research-group-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:0 0 7px;padding-left:2px}
.research-group-head h3{margin:0;font-size:14px;letter-spacing:-.01em}
.research-group-head span{color:var(--muted);font-size:11px}
.empty-subgroup{
  padding:10px 12px;border:1px dashed var(--line-dark);border-radius:11px;
  color:var(--muted);background:rgba(255,255,255,.5);font-size:12px;
}
.toc{position:sticky;top:91px}
.toc-inner{padding-left:17px;border-left:1px solid var(--line-dark)}
.toc-label{display:block;margin-bottom:11px;color:var(--muted);font-size:11px;font-weight:730;letter-spacing:.09em;text-transform:uppercase}
.toc-list{display:grid;gap:4px}
.toc-link{
  display:grid;grid-template-columns:24px 1fr;gap:7px;
  padding:7px 8px;border-radius:8px;color:var(--muted);font-size:12px;
}
.toc-link span:first-child{color:#9aa4b3;font-size:10px;padding-top:2px}
.toc-link:hover,.toc-link.active{background:var(--accent-soft);color:var(--accent)}
.toc-note{margin:15px 8px 0;color:#8a94a3;font-size:10px}
.date-nav{
  display:grid;grid-template-columns:1fr auto 1fr;gap:12px;align-items:center;
  margin:42px 0 64px;padding-top:19px;border-top:1px solid var(--line);
}
.date-nav a,.date-nav .disabled{
  padding:11px 13px;border:1px solid var(--line);border-radius:11px;background:var(--paper);font-size:12px;
}
.date-nav a:last-child,.date-nav .disabled{text-align:right}
.date-nav .current{color:var(--muted);font-size:12px;text-align:center}
.date-nav .disabled{color:#a3abb7;background:#f7f8fa;cursor:not-allowed}
.footer{padding:26px 0 38px;border-top:1px solid var(--line);color:var(--muted);font-size:12px}
.footer-row{display:flex;align-items:center;justify-content:space-between;gap:18px}
.chat-toggle{
  position:fixed;right:20px;bottom:20px;z-index:70;
  display:flex;align-items:center;gap:8px;
  padding:10px 14px;border:1px solid var(--accent-dark);border-radius:999px;
  background:var(--accent);color:#fff;box-shadow:0 12px 30px rgba(49,95,206,.24);
}
.chat-panel{
  position:fixed;right:20px;bottom:72px;z-index:69;
  width:min(390px,calc(100vw - 28px));height:520px;
  display:none;grid-template-rows:auto 1fr auto;
  overflow:hidden;border:1px solid var(--line);border-radius:17px;
  background:var(--paper);box-shadow:0 24px 70px rgba(22,38,68,.19);
}
.chat-panel.open{display:grid}
.chat-head{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;padding:14px 15px;border-bottom:1px solid var(--line)}
.chat-head strong{display:block;font-size:14px}
.context-chip{
  display:none;max-width:305px;margin-top:6px;padding:5px 8px;border-radius:8px;
  background:var(--accent-soft);color:var(--accent);font-size:10px;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.context-chip.show{display:block}
.chat-close{border:0;background:transparent;color:var(--muted);font-size:18px}
.chat-messages{overflow:auto;padding:14px;display:grid;align-content:start;gap:9px;background:var(--paper-soft)}
.msg{max-width:87%;padding:9px 11px;border-radius:12px;font-size:12px}
.msg.bot{justify-self:start;background:var(--paper);border:1px solid var(--line)}
.msg.user{justify-self:end;background:var(--accent);color:#fff}
.chat-form{padding:11px;border-top:1px solid var(--line);background:var(--paper)}
.chat-form textarea{width:100%;min-height:68px;resize:none;padding:9px 10px;border:1px solid var(--line);border-radius:10px;background:var(--paper);color:var(--text)}
.chat-form-row{display:flex;align-items:center;justify-content:space-between;gap:9px;margin-top:7px}
.chat-hint{color:var(--muted);font-size:10px}
.chat-send{padding:7px 12px;border:0;border-radius:8px;background:var(--accent);color:#fff;font-size:11px}
.modal{position:fixed;inset:0;z-index:80;display:none;align-items:center;justify-content:center;padding:22px;background:rgba(24,34,51,.36)}
.modal.open{display:flex}
.modal-card{width:min(900px,100%);max-height:82vh;overflow:auto;padding:20px;border:1px solid var(--line);border-radius:17px;background:var(--paper);box-shadow:0 30px 80px rgba(19,34,63,.22)}
.modal-head{display:flex;align-items:center;justify-content:space-between;gap:18px;margin-bottom:12px}
.modal-head h2{margin:0;font-size:20px}
.modal-close{width:35px;height:35px;border:1px solid var(--line);border-radius:9px;background:var(--paper-soft);color:var(--text)}
.source-table{width:100%;border-collapse:collapse;font-size:12px}
.source-table th,.source-table td{padding:10px 8px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
.source-table th{position:sticky;top:0;background:var(--paper-soft);color:var(--muted);font-weight:650}
.status{padding:3px 7px;border-radius:999px;font-size:10px}
.status.ok{background:var(--green-soft);color:var(--green)}
.status.warn{background:var(--amber-soft);color:var(--amber)}
.status.bad{background:var(--rose-soft);color:var(--rose)}
.archive-hero{padding:48px 0 27px}
.archive-hero h1{font-size:clamp(30px,4vw,42px)}
.today-entry{
  display:grid;grid-template-columns:1.15fr .85fr;gap:17px;
  padding:23px;margin:5px 0 35px;border:1px solid #cfdbf3;border-radius:17px;
  background:linear-gradient(145deg,#f3f7ff,#ebf2ff);
}
.today-entry h2{margin:7px 0 7px;font-size:27px;letter-spacing:-.032em}
.today-entry p{margin:0;color:var(--muted);font-size:14px}
.today-entry-actions{display:flex;gap:8px;margin-top:17px}
.primary-link,.secondary-link{display:inline-flex;align-items:center;justify-content:center;padding:9px 13px;border-radius:9px;font-size:12px;font-weight:680}
.primary-link{background:var(--accent);color:#fff}
.secondary-link{background:var(--paper);border:1px solid var(--line);color:var(--accent)}
.today-brief{padding:16px;border:1px solid #d7e2f6;border-radius:13px;background:var(--paper)}
.today-brief strong{font-size:13px}
.today-brief ol{margin:9px 0 0;padding-left:19px;color:#46536a;font-size:12px}
.intro-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:0 0 38px}
.intro-card{padding:17px;border:1px solid var(--line);border-radius:13px;background:var(--paper)}
.intro-card strong{display:block;margin-bottom:5px;font-size:14px}
.intro-card p{margin:0;color:var(--muted);font-size:12px}
.archive-toolbar{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-bottom:13px}
.archive-toolbar h2{margin:0;font-size:24px}
.archive-search{width:min(320px,100%);padding:9px 11px;border:1px solid var(--line);border-radius:10px;background:var(--paper)}
.archive-list{display:grid;gap:9px;margin-bottom:62px}
.archive-item{display:grid;grid-template-columns:105px 1fr auto;gap:17px;align-items:center;padding:15px 17px;border:1px solid var(--line);border-radius:13px;background:var(--paper)}
.archive-date{font-weight:700}
.archive-summary{color:var(--muted);font-size:12px}
.archive-tags{display:flex;flex-wrap:wrap;gap:5px;margin-top:6px}
.archive-meta{color:var(--muted);font-size:11px;text-align:right}
@media (max-width:920px){
  .content-layout{grid-template-columns:1fr}
  .toc{display:none}
  .mobile-category-bar{display:block}
  .feature-layout{grid-template-columns:1fr}
  .feature-main{min-height:280px}
  .feature-side{grid-template-columns:1fr 1fr}
}
@media (max-width:720px){
  .shell{width:min(calc(100% - 28px),var(--max))}
  .topbar-inner{height:57px}
  .progress{top:57px}
  .brand-path,.nav a:not(.active){display:none}
  .page-hero{padding:29px 0 21px}
  h1{font-size:31px}
  .brief{padding:17px}
  .brief-head{align-items:flex-start;flex-direction:column;gap:3px}
  .brief-grid{grid-template-columns:1fr;gap:10px}
  .brief-item{padding:0 0 10px;border-right:0;border-bottom:1px solid rgba(49,95,206,.13)}
  .brief-item:last-child{padding-bottom:0;border-bottom:0}
  .feature-side{grid-template-columns:1fr}
  .feature-main h3{font-size:21px}
  .section-head{align-items:flex-start;flex-direction:column}
  .mobile-category-bar{top:58px}
  .story-top,.story-footer{align-items:flex-start;flex-direction:column}
  .actions{width:100%;justify-content:flex-end}
  .interpret-row{grid-template-columns:1fr;gap:2px}
  .date-nav{grid-template-columns:1fr}
  .date-nav .current{order:-1}
  .date-nav a:last-child,.date-nav .disabled{text-align:left}
  .footer-row{align-items:flex-start;flex-direction:column}
  .chat-toggle{right:14px;bottom:14px}
  .chat-panel{right:14px;bottom:66px;height:min(520px,73vh)}
  .source-table{min-width:710px}
  .archive-item{grid-template-columns:1fr}
  .archive-meta{text-align:left}
  .today-entry{grid-template-columns:1fr}
  .intro-grid{grid-template-columns:1fr}
  .archive-toolbar{align-items:flex-start;flex-direction:column}
}