/* Dash-U /insights/ shared styles. Tokens mirror the main site (see integration spec) */
:root{
  --bg:#050608; --bg2:#0A0F1A;
  --ink:#EDF3F7; --muted:#E6ECF4; --faint:#C2CCDA;
  --line:rgba(255,255,255,.08);
  --glass:rgba(255,255,255,.035);
  --cyan:#22D3EE; --teal:#2DD4BF; --blue:#3B82F6;
  --r:20px;
  --maxw:1180px;
  --prose:720px;
  --disp:'Sora',-apple-system,'PingFang TC','Noto Sans TC','Microsoft JhengHei',sans-serif;
  --body:'Sora',-apple-system,BlinkMacSystemFont,'PingFang TC','Noto Sans TC','Microsoft JhengHei',sans-serif;
  --mono:'Geist Mono','Courier New',monospace;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--ink);font-family:var(--body);font-size:16px;line-height:1.9;letter-spacing:.02em;-webkit-font-smoothing:antialiased}
::selection{background:rgba(34,211,238,.25)}
a{color:inherit;text-decoration:none}

/* background: same nebula + star layers as the homepage (static, no parallax JS;
   the WebGL beams are deliberately not carried over) */
.bg-nebula{position:fixed;inset:-8% -4%;z-index:-1;pointer-events:none;
  background:
    radial-gradient(40% 46% at 22% 16%, rgba(150,120,245,.55), rgba(130,100,225,.18) 50%, transparent 70%),
    radial-gradient(56% 70% at 40% 52%, rgba(168,108,222,.48), rgba(132,86,200,.16) 54%, transparent 82%),
    radial-gradient(46% 44% at 66% 36%, rgba(214,112,196,.40), rgba(180,90,170,.12) 50%, transparent 74%),
    radial-gradient(52% 58% at 16% 94%, rgba(244,168,108,.46), rgba(224,120,152,.18) 44%, transparent 74%),
    radial-gradient(48% 50% at 84% 78%, rgba(236,150,96,.30), transparent 70%),
    radial-gradient(52% 62% at 90% 26%, rgba(82,104,196,.34), transparent 72%),
    radial-gradient(72% 92% at 50% 48%, rgba(5,6,12,0), rgba(5,6,12,.42) 90%);
  transform:scale(1.12);transform-origin:center;filter:saturate(1.12)}
@media(prefers-reduced-motion:reduce){.bg-nebula{transform:none}}
.bg-stars{position:fixed;inset:-20% 0 -120% 0;z-index:0;pointer-events:none;background-repeat:repeat}
.bg-stars.far{opacity:.7;animation:starTwinkle 8s ease-in-out infinite;
  background-image:
    radial-gradient(1.2px 1.2px at 15% 22%,rgba(255,255,255,.85),transparent 60%),
    radial-gradient(1px 1px at 62% 8%,rgba(210,225,255,.7),transparent 60%),
    radial-gradient(1.2px 1.2px at 84% 44%,rgba(255,255,255,.8),transparent 60%),
    radial-gradient(1px 1px at 33% 66%,rgba(225,235,255,.72),transparent 60%),
    radial-gradient(1.2px 1.2px at 51% 90%,rgba(255,255,255,.7),transparent 60%),
    radial-gradient(1px 1px at 9% 84%,rgba(235,225,255,.7),transparent 60%),
    radial-gradient(1.2px 1.2px at 73% 74%,rgba(255,245,235,.72),transparent 60%);
  background-size:110px 110px,130px 130px,95px 95px,120px 120px,105px 105px,140px 140px,115px 115px}
.bg-stars.mid{animation:starTwinkle 5.5s ease-in-out infinite;
  background-image:
    radial-gradient(2.4px 2.4px at 12% 58%,rgba(255,255,255,1) 0%,rgba(205,225,255,.55) 45%,transparent 72%),
    radial-gradient(2.2px 2.2px at 62% 34%,rgba(220,235,255,1) 0%,rgba(180,210,255,.5) 45%,transparent 72%),
    radial-gradient(2.6px 2.6px at 33% 14%,rgba(255,250,245,1) 0%,rgba(230,205,235,.5) 45%,transparent 72%),
    radial-gradient(2.2px 2.2px at 73% 88%,rgba(255,255,255,1) 0%,rgba(200,200,255,.5) 45%,transparent 72%),
    radial-gradient(2.4px 2.4px at 90% 30%,rgba(255,255,255,1) 0%,rgba(210,225,255,.5) 45%,transparent 72%),
    radial-gradient(2.2px 2.2px at 6% 86%,rgba(255,240,230,1) 0%,rgba(235,200,180,.5) 45%,transparent 72%);
  background-size:230px 230px,260px 260px,210px 210px,250px 250px,280px 280px,200px 200px}
.bg-stars.near{animation:starTwinkle 4.5s ease-in-out infinite;
  background-image:
    radial-gradient(7px 7px at 18% 24%,rgba(255,255,255,1) 0%,rgba(175,215,255,.8) 20%,rgba(120,180,255,.3) 44%,transparent 70%),
    radial-gradient(8px 8px at 78% 16%,rgba(235,245,255,1) 0%,rgba(155,205,255,.78) 20%,rgba(110,175,255,.28) 44%,transparent 70%),
    radial-gradient(6px 6px at 46% 82%,rgba(255,250,250,1) 0%,rgba(235,180,210,.7) 20%,rgba(200,130,180,.26) 44%,transparent 70%),
    radial-gradient(9px 9px at 88% 64%,rgba(215,238,255,1) 0%,rgba(140,200,255,.78) 20%,rgba(100,170,255,.26) 44%,transparent 70%),
    radial-gradient(6px 6px at 30% 54%,rgba(255,255,255,1) 0%,rgba(180,218,255,.75) 20%,rgba(120,185,255,.26) 44%,transparent 70%);
  background-size:360px 360px,320px 320px,400px 400px,340px 340px,380px 380px}
.bg-stars.front{animation:starTwinkle 3.6s ease-in-out infinite;
  background-image:
    radial-gradient(11px 11px at 14% 30%,rgba(255,255,255,1) 0%,rgba(185,220,255,.85) 16%,rgba(120,180,255,.32) 40%,transparent 66%),
    radial-gradient(13px 13px at 70% 22%,rgba(255,252,250,1) 0%,rgba(245,190,215,.8) 16%,rgba(210,130,180,.3) 40%,transparent 66%),
    radial-gradient(12px 12px at 40% 78%,rgba(235,245,255,1) 0%,rgba(150,205,255,.82) 16%,rgba(110,175,255,.3) 40%,transparent 66%),
    radial-gradient(14px 14px at 90% 60%,rgba(255,255,255,1) 0%,rgba(200,225,255,.82) 16%,rgba(140,190,255,.3) 40%,transparent 66%);
  background-size:560px 560px,620px 620px,520px 520px,580px 580px}
@keyframes starTwinkle{0%,100%{opacity:.82}50%{opacity:1}}
@media(prefers-reduced-motion:reduce){.bg-stars{animation:none}}
.bg-veil{position:fixed;inset:0;z-index:0;pointer-events:none;
  background:
    radial-gradient(42% 65% at 3% 42%,rgba(34,211,238,.16),transparent 62%),
    radial-gradient(55% 45% at 82% 6%,rgba(59,130,246,.10),transparent 60%),
    linear-gradient(180deg,transparent 0%,rgba(5,6,8,.4) 46%,var(--bg) 82%)}
main,nav,footer{position:relative;z-index:2}

/* nav capsule (same recipe as main site) */
nav{position:sticky;top:0;z-index:50;padding-top:16px}
.nav-in{width:min(var(--maxw),92vw);margin-inline:auto;display:flex;align-items:center;gap:26px;height:66px;
  padding:0 22px 0 26px;border-radius:999px;
  background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.10);
  -webkit-backdrop-filter:blur(20px) saturate(1.3);backdrop-filter:blur(20px) saturate(1.3);
  box-shadow:0 10px 34px rgba(0,0,0,.4),inset 0 1px 0 rgba(255,255,255,.06)}
.logo{display:flex;align-items:center;gap:9px}
.logo .mark{height:31px;width:auto;display:block;filter:drop-shadow(0 4px 12px rgba(45,212,191,.28))}
.logo .word{height:19px;width:auto;display:block}
.logo:hover .mark{filter:drop-shadow(0 4px 16px rgba(45,212,191,.55))}
.nav-links{display:flex;gap:26px;margin-left:auto;font-size:13px;color:var(--muted);text-transform:uppercase;letter-spacing:.1em}
.nav-links a{transition:color .3s ease}
.nav-links a:hover,.nav-links a[aria-current="page"]{color:var(--ink)}
.nav-in .btn{padding:10px 20px;font-size:13px}
.cta-ic{width:16px;height:16px;display:block}
@media (max-width:1080px){.nav-links .hide-sm{display:none}}
@media (max-width:640px){.nav-links{gap:18px}.nav-in .btn span{display:none}.nav-in .btn{padding:10px 13px}}

/* layout */
.wrap{width:min(var(--maxw),92vw);margin-inline:auto}
.prose-wrap{width:min(var(--maxw),92vw);margin-inline:auto}

/* index hero */
.hero{padding:96px 0 30px}
.eyebrow{font-family:var(--mono);font-size:12px;letter-spacing:.22em;text-transform:uppercase;color:var(--cyan);margin-bottom:18px}
.hero h1{font-family:var(--disp);font-size:clamp(30px,5vw,46px);font-weight:700;line-height:1.35;letter-spacing:.01em}
.hero .sub{margin-top:18px;max-width:640px;color:var(--faint);font-size:16px}

/* article list */
.list{display:flex;flex-direction:column;gap:18px;padding:42px 0 80px}
.post-card{display:flex;align-items:center;gap:30px;background:var(--glass);border:1px solid var(--line);border-radius:var(--r);
  padding:26px 30px;transition:border-color .3s ease,background .3s ease}
.post-card:hover{border-color:rgba(45,212,191,.4);background:rgba(255,255,255,.05)}
.pc-thumb{flex:0 0 320px;aspect-ratio:16/9;border-radius:14px;overflow:hidden;border:1px solid var(--line)}
.pc-thumb img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .4s ease}
.post-card:hover .pc-thumb img{transform:scale(1.04)}
.pc-body{min-width:0;flex:1}
@media (max-width:760px){
  .post-card{flex-direction:column;align-items:stretch;gap:18px;padding:22px}
  .pc-thumb{flex:none;width:100%}
}
.post-card .meta{font-family:var(--mono);font-size:12px;letter-spacing:.12em;color:var(--faint);margin-bottom:10px;display:flex;gap:14px;flex-wrap:wrap}
.post-card h2{font-family:var(--disp);font-size:clamp(19px,2.6vw,23px);font-weight:600;line-height:1.5;letter-spacing:.01em}
.post-card p{margin-top:10px;color:var(--faint);font-size:14.5px}
.post-card .more{margin-top:14px;font-family:var(--mono);font-size:12.5px;letter-spacing:.14em;color:var(--cyan)}

/* article page */
article{padding:88px 0 40px}
.a-head .meta{font-family:var(--mono);font-size:12.5px;letter-spacing:.12em;color:var(--faint);display:flex;gap:14px;flex-wrap:wrap;margin:20px 0 0}
.a-head h1{font-family:var(--disp);font-size:clamp(26px,4.2vw,38px);font-weight:700;line-height:1.5;letter-spacing:.01em}
.a-head .lead{margin-top:26px;font-size:17.5px;color:var(--muted);line-height:2.0}
.a-body{margin-top:44px}
.a-body h2{font-family:var(--disp);font-size:clamp(20px,3vw,24px);font-weight:600;line-height:1.6;margin:56px 0 18px;padding-top:26px;border-top:1px solid var(--line);letter-spacing:.01em}
.a-body h3{font-family:var(--disp);font-size:17px;font-weight:600;margin:34px 0 12px;color:var(--ink)}
.a-body p{margin:0 0 22px;color:var(--muted)}
.a-body strong{color:var(--ink);font-weight:600}
.a-body ul,.a-body ol{margin:0 0 22px;padding-left:26px;color:var(--muted)}
.a-body li{margin-bottom:10px}
.a-body li::marker{color:var(--cyan)}
.a-body blockquote{margin:28px 0;padding:20px 26px;border-left:2px solid var(--teal);
  background:var(--glass);border-radius:0 14px 14px 0;color:var(--muted);font-size:15.5px}

/* boxes */
.takeaway{border:1px solid rgba(45,212,191,.3);border-radius:var(--r);padding:26px 30px;margin:34px 0;background:var(--glass)}
.takeaway .tag{font-family:var(--mono);font-size:11.5px;letter-spacing:.2em;text-transform:uppercase;margin-bottom:12px;color:var(--teal)}
.takeaway p{color:var(--muted);font-size:15px;margin:0 0 12px}
.takeaway p:last-child{margin-bottom:0}
/* source caveats — plain footnote, deliberately unboxed (盒子密度控管，2026-07-31) */
.note{margin:44px 0 0;padding:0;border:0;background:none}
.note .tag{font-family:var(--mono);font-size:11px;letter-spacing:.2em;text-transform:uppercase;margin-bottom:10px;color:var(--faint)}
.note p{color:var(--faint);font-size:13.5px;line-height:1.9;margin:0 0 10px}
.note p:last-child{margin-bottom:0}
.takeaway ol{margin:0;padding-left:24px;color:var(--muted);font-size:15px}
.takeaway ol li{margin-bottom:10px}

/* data table */
.a-body table{width:100%;border-collapse:collapse;margin:26px 0;font-size:14.5px}
.a-body th{font-family:var(--mono);font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--faint);text-align:left;padding:10px 14px;border-bottom:1px solid var(--line)}
.a-body td{padding:12px 14px;border-bottom:1px solid var(--line);color:var(--muted);vertical-align:top}

/* CTA band */
.cta-band{margin:64px 0 0;border:1px solid var(--line);border-radius:var(--r);padding:36px;background:linear-gradient(180deg,rgba(255,255,255,.05),rgba(255,255,255,.02));text-align:center}
.cta-band h2{font-family:var(--disp);font-size:21px;font-weight:600;line-height:1.6}
.cta-band p{margin:12px auto 22px;color:var(--faint);font-size:15px;max-width:520px}
.btn{display:inline-flex;align-items:center;gap:9px;border:0;border-radius:999px;padding:13px 26px;
  font-family:var(--disp);font-size:14px;font-weight:600;letter-spacing:.04em;color:#fff;cursor:pointer;
  background:linear-gradient(122deg,#7C5CE6,#4E72E8,#27C2E6);background-clip:padding-box;transition:box-shadow 1s ease,opacity .3s ease}
.btn:hover{box-shadow:0 0 34px rgba(255,255,255,.28)}

/* breadcrumbs */
.crumbs{font-family:var(--mono);font-size:12.5px;letter-spacing:.1em;color:var(--faint);margin-bottom:38px;display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.crumbs a{transition:color .3s ease}
.crumbs a:hover{color:var(--cyan)}
.crumbs .sep{color:rgba(255,255,255,.25)}
.crumbs .here{color:var(--muted)}

/* article hero cover */
.hero-fig{margin:34px 0 0}
.hero-fig img{width:100%;height:auto;display:block;border-radius:var(--r);border:1px solid var(--line)}
.hero-fig figcaption{font-family:var(--mono);font-size:11.5px;letter-spacing:.12em;color:var(--faint);margin-top:10px;text-align:right}

/* figures (inline SVG diagrams) */
.fig{margin:32px 0;border:1px solid var(--line);border-radius:var(--r);background:var(--glass);padding:26px 22px 16px;overflow-x:auto}
.fig svg{display:block;width:100%;min-width:640px;height:auto}
.fig figcaption{font-family:var(--mono);font-size:12px;letter-spacing:.12em;color:var(--faint);margin-top:12px;text-align:center}

/* FAQ */
.faq{margin:56px 0 0;padding-top:26px;border-top:1px solid var(--line)}
.faq>.tag{font-family:var(--mono);font-size:11.5px;letter-spacing:.2em;text-transform:uppercase;color:var(--cyan);margin-bottom:18px}
.faq-item{border:1px solid var(--line);border-radius:16px;background:var(--glass);padding:22px 26px;margin-bottom:14px}
.faq-item h3{font-family:var(--disp);font-size:16px;font-weight:600;margin:0 0 10px;color:var(--ink)}
.faq-item p{margin:0;color:var(--muted);font-size:15px}

/* related reading — navigation tier, deliberately lighter than FAQ content cards */
.related{margin:52px 0 0;padding-top:24px;border-top:1px solid var(--line);display:flex;flex-direction:column;gap:16px}
.related a{display:block}
.related .rel-tag{font-family:var(--mono);font-size:11.5px;letter-spacing:.16em;color:var(--faint);display:block;margin-bottom:6px}
.related .rel-title{font-family:var(--disp);font-size:16px;font-weight:600;color:var(--muted);transition:color .3s ease}
.related .rel-title::after{content:"→";margin-left:10px;color:var(--cyan);font-weight:400}
.related a:hover .rel-title{color:var(--cyan)}

/* prev/next + back link */
.back-link{font-family:var(--mono);font-size:12.5px;letter-spacing:.14em;color:var(--faint);display:inline-block;margin-bottom:34px;transition:color .3s ease}
.back-link:hover{color:var(--cyan)}

/* footer — same 4-column grid as the homepage (zh text hardcoded, no JS i18n here) */
footer{border-top:1px solid var(--line);margin-top:70px;padding:44px 0 30px}
.foot-grid{display:flex;justify-content:space-between;gap:30px;flex-wrap:wrap;color:var(--muted);font-size:13px}
@media(max-width:860px){
  .foot-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:32px 20px}
  .foot-grid > .foot-col:first-child{grid-column:1/-1;max-width:46ch!important}
  .foot-grid > .foot-col:last-child{grid-column:1/-1}
}
@media(min-width:861px) and (max-width:1029px){
  .foot-grid{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);
             gap:38px 48px;align-items:start}
  .foot-grid > .foot-col:first-child{grid-column:1;grid-row:1;max-width:40ch!important}
  .foot-grid > .foot-col:nth-child(2){grid-column:1;grid-row:2}
  .foot-grid > .foot-col:nth-child(3){grid-column:2;grid-row:2}
  .foot-grid > .foot-col:last-child{grid-column:2;grid-row:1}
}
.foot-col a.faint-link{color:var(--faint)}
.foot-grid a:hover{color:var(--cyan)}
.foot-col h4{font-family:var(--disp);font-size:13px;color:var(--ink);margin-bottom:12px;letter-spacing:.02em}
.foot-col p,.foot-col a{display:block;margin-bottom:8px;color:var(--muted);transition:color .3s ease}
.social-row{display:flex;align-items:center;gap:28px;margin-top:18px}
.social-row a{display:inline-flex;color:var(--faint);transition:color .25s ease,transform .25s ease}
.social-row a:hover,.social-row a:focus-visible{color:var(--cyan)}
.social-row svg{width:23px;height:23px;display:block;fill:currentColor}
.copy{margin-top:36px;padding-top:22px;border-top:1px solid var(--line);font-family:var(--mono);font-size:11px;color:var(--faint);letter-spacing:.06em;text-align:center}