/* ============================================================
   Design system — "living system" · dark-first
   ============================================================ */
:root{
  --bg:#0a0c10;
  --bg-raise:#10131a;
  --bg-inset:#0d1016;
  --ink:#e8ebf2;
  --ink-2:#9aa3b5;
  --ink-3:#5f6879;
  --line:#1d2331;
  --line-soft:#161b26;
  --accent:#ffb454;
  --accent-ink:#ffc57a;
  --accent-soft:rgba(255,180,84,.09);
  --ok:#5fd39a;
  --ok-soft:rgba(95,211,154,.12);
  --shadow:0 1px 2px rgba(0,0,0,.4),0 12px 32px -12px rgba(0,0,0,.55);
  --shadow-lg:0 2px 4px rgba(0,0,0,.45),0 32px 64px -24px rgba(0,0,0,.7);
  --glow:0 0 24px rgba(255,180,84,.12);
  color-scheme:dark;
}
[data-theme="light"]{
  --bg:#faf9f6;
  --bg-raise:#ffffff;
  --bg-inset:#f2f0ea;
  --ink:#191c22;
  --ink-2:#4e5563;
  --ink-3:#878e9c;
  --line:#e3e0d8;
  --line-soft:#eceadeb0;
  --accent:#b06a10;
  --accent-ink:#8f5408;
  --accent-soft:rgba(176,106,16,.08);
  --ok:#1c8f5c;
  --ok-soft:rgba(28,143,92,.1);
  --shadow:0 1px 2px rgba(25,28,34,.05),0 10px 28px -12px rgba(25,28,34,.13);
  --shadow-lg:0 2px 4px rgba(25,28,34,.06),0 28px 56px -20px rgba(25,28,34,.2);
  --glow:none;
  color-scheme:light;
}

/* cross-document view transitions (progressive) */
@view-transition{ navigation:auto }

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:76px}
@media (prefers-reduced-motion:reduce){ html{scroll-behavior:auto} }
body{
  font-family:"Inter",system-ui,-apple-system,sans-serif;
  background:var(--bg);color:var(--ink);
  line-height:1.65;font-size:16px;
  -webkit-font-smoothing:antialiased;
  transition:background .3s ease,color .3s ease;
}
::selection{background:var(--accent);color:#0a0c10}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
button{font:inherit;color:inherit}
.serif{font-family:"Instrument Serif",Georgia,serif;font-style:italic;font-weight:400}
.mono{font-family:"JetBrains Mono",ui-monospace,monospace}

.wrap{max-width:1100px;margin:0 auto;padding:0 24px}
section{padding:96px 0;position:relative}
@media(max-width:640px){section{padding:64px 0}}

.skip{position:absolute;left:-9999px;top:0;background:var(--accent);color:#0a0c10;padding:10px 16px;border-radius:0 0 10px 0;z-index:999;font-weight:600}
.skip:focus{left:0}

/* faint grid texture */
.grid-bg{
  position:fixed;inset:0;pointer-events:none;z-index:-1;
  background-image:
    linear-gradient(var(--line-soft) 1px,transparent 1px),
    linear-gradient(90deg,var(--line-soft) 1px,transparent 1px);
  background-size:56px 56px;
  mask-image:radial-gradient(ellipse 90% 70% at 50% 0%,#000 0%,transparent 75%);
  -webkit-mask-image:radial-gradient(ellipse 90% 70% at 50% 0%,#000 0%,transparent 75%);
  opacity:.5;
}

/* ---------- section labels ---------- */
.sec-label{
  font-family:"JetBrains Mono",monospace;font-size:12.5px;letter-spacing:.1em;
  color:var(--accent);font-weight:500;
  display:flex;align-items:center;gap:14px;margin-bottom:22px;
}
.sec-label::after{content:"";height:1px;flex:0 0 56px;background:linear-gradient(90deg,var(--accent),transparent)}
.sec-label .idx{color:var(--ink-3)}
h2{font-size:clamp(27px,3.8vw,36px);font-weight:650;letter-spacing:-.022em;margin-bottom:14px}
.section-intro{color:var(--ink-2);max-width:58ch;margin-bottom:48px}

/* ---------- status chip ---------- */
.status{
  display:inline-flex;align-items:center;gap:9px;
  font-family:"JetBrains Mono",monospace;font-size:12.5px;letter-spacing:.02em;
  color:var(--ink-2);border:1px solid var(--line);background:var(--bg-raise);
  padding:7px 14px;border-radius:99px;
}
.status .dot{width:7px;height:7px;border-radius:50%;background:var(--ok);box-shadow:0 0 0 4px var(--ok-soft);animation:pulse 2.4s ease infinite}
@keyframes pulse{0%,100%{box-shadow:0 0 0 3px var(--ok-soft)}50%{box-shadow:0 0 0 6px transparent}}
@media (prefers-reduced-motion:reduce){.status .dot{animation:none}}

/* ============ Nav ============ */
header.site{
  position:sticky;top:0;z-index:60;
  backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
  background:color-mix(in srgb,var(--bg) 78%,transparent);
  border-bottom:1px solid var(--line-soft);
}
.nav{display:flex;align-items:center;justify-content:space-between;height:62px}
.brand{display:flex;align-items:center;gap:10px;font-family:"JetBrains Mono",monospace;font-size:14px;font-weight:500;letter-spacing:-.01em}
.brand .sig{color:var(--accent)}
.brand .cursor{display:inline-block;width:8px;height:16px;background:var(--accent);animation:blink 1.1s steps(1) infinite;vertical-align:-2px}
@keyframes blink{50%{opacity:0}}
@media (prefers-reduced-motion:reduce){.brand .cursor{animation:none}}
.nav-links{display:flex;gap:2px;align-items:center;list-style:none}
.nav-links a{
  font-size:13.5px;font-weight:500;color:var(--ink-2);
  padding:7px 12px;border-radius:8px;transition:color .2s,background .2s;
}
.nav-links a:hover{color:var(--ink);background:var(--bg-raise)}
.nav-links a.active{color:var(--accent)}
@media(max-width:720px){.nav-links a{display:none}}
.nav-btn{
  cursor:pointer;border:1px solid var(--line);background:var(--bg-raise);
  height:34px;border-radius:9px;display:inline-flex;align-items:center;gap:7px;
  color:var(--ink-2);padding:0 10px;transition:border-color .2s,color .2s;
  font-family:"JetBrains Mono",monospace;font-size:12px;
}
.nav-btn:hover{border-color:var(--accent);color:var(--accent)}
.nav-btn svg{width:14px;height:14px}
.nav-ctl{display:flex;gap:8px;align-items:center;margin-left:10px}
.kbd{
  font-family:"JetBrains Mono",monospace;font-size:10.5px;color:var(--ink-3);
  border:1px solid var(--line);border-bottom-width:2px;border-radius:5px;padding:1px 5px;background:var(--bg);
}

/* ============ Hero ============ */
.hero{padding:88px 0 84px;position:relative;overflow:hidden;min-height:78vh;display:flex;align-items:center}
#systemCanvas,.hero-fallback{position:absolute;inset:0;pointer-events:none}
.hero-fallback{display:none}
.hero-veil{
  position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(90deg,var(--bg) 0%,color-mix(in srgb,var(--bg) 86%,transparent) 46%,transparent 100%);
}
@media(max-width:800px){.hero-veil{background:linear-gradient(180deg,color-mix(in srgb,var(--bg) 70%,transparent),var(--bg) 88%)}}
.hero-inner{position:relative;width:100%}
.hero h1{
  font-size:clamp(40px,6.4vw,68px);font-weight:700;letter-spacing:-.04em;
  line-height:1.03;margin:26px 0 20px;
}
.hero h1 .thin{color:var(--ink-2);font-weight:500}
.hero .tagline{
  font-size:clamp(19px,2.5vw,24px);color:var(--ink-2);line-height:1.5;
  max-width:44ch;margin-bottom:16px;letter-spacing:-.012em;
}
.tagline .serif{color:var(--accent-ink);font-size:1.07em}
.hero p.lede{color:var(--ink-2);max-width:58ch;margin-bottom:34px}
.hero p.lede strong{color:var(--ink);font-weight:600}
.hero-tip{margin-top:26px;font-family:"JetBrains Mono",monospace;font-size:12px;color:var(--ink-3)}
.hero-tip .kbd{margin:0 2px}

.actions{display:flex;flex-wrap:wrap;gap:12px;align-items:center}
.btn{
  display:inline-flex;align-items:center;gap:9px;cursor:pointer;
  font-size:14px;font-weight:600;padding:11px 20px;border-radius:10px;
  border:1px solid var(--line);background:var(--bg-raise);color:var(--ink);
  transition:transform .15s ease,box-shadow .2s,border-color .2s,background .2s,color .2s;
}
.btn:hover{transform:translateY(-1px);box-shadow:var(--shadow);border-color:var(--ink-3)}
.btn.primary{background:var(--accent);color:#141005;border-color:var(--accent)}
.btn.primary:hover{box-shadow:var(--shadow),var(--glow)}
.btn svg{width:15px;height:15px;flex-shrink:0}

/* ============ Metrics ============ */
.metrics{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--bg-inset);padding:46px 0}
.metrics-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:22px}
@media(max-width:940px){.metrics-grid{grid-template-columns:repeat(3,1fr);gap:30px}}
@media(max-width:560px){.metrics-grid{grid-template-columns:repeat(2,1fr)}}
.metric .num{
  font-family:"JetBrains Mono",monospace;font-size:clamp(23px,3vw,31px);
  font-weight:500;letter-spacing:-.035em;color:var(--ink);
}
.metric .num b{color:var(--accent);font-weight:500}
.metric .lbl{font-size:12.5px;color:var(--ink-3);margin-top:5px;line-height:1.45}

/* ============ Cards / work ============ */
.work-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
@media(max-width:760px){.work-grid{grid-template-columns:1fr}}
.card{
  background:var(--bg-raise);border:1px solid var(--line);border-radius:16px;
  padding:28px;transition:transform .2s ease,box-shadow .25s,border-color .25s;
  display:flex;flex-direction:column;gap:12px;position:relative;
}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg);border-color:color-mix(in srgb,var(--accent) 45%,var(--line))}
.card.flag{grid-column:1/-1;background:linear-gradient(135deg,var(--bg-raise),color-mix(in srgb,var(--accent-soft) 60%,var(--bg-raise)))}
.card .kind{
  font-family:"JetBrains Mono",monospace;font-size:11px;letter-spacing:.12em;
  text-transform:uppercase;color:var(--accent);font-weight:500;
  display:flex;align-items:center;gap:10px;
}
.card .kind .wip{
  color:var(--ok);border:1px solid color-mix(in srgb,var(--ok) 35%,transparent);
  background:var(--ok-soft);padding:2px 8px;border-radius:99px;text-transform:none;letter-spacing:.02em;
}
.card h3{font-size:19px;font-weight:600;letter-spacing:-.015em}
.card h3 a::after{content:"";position:absolute;inset:0}
.card p{font-size:14.5px;color:var(--ink-2)}
.card .impact{
  font-size:13.5px;font-weight:600;color:var(--ink);
  padding:10px 14px;background:var(--bg-inset);border-radius:10px;border-left:2px solid var(--accent);
}
.tags{display:flex;flex-wrap:wrap;gap:7px;margin-top:auto}
.tag{
  font-family:"JetBrains Mono",monospace;font-size:11.5px;color:var(--ink-2);
  border:1px solid var(--line);padding:4px 10px;border-radius:99px;background:var(--bg);
}
.card .ext{position:absolute;top:26px;right:26px;color:var(--ink-3);transition:color .2s,transform .2s;font-family:"JetBrains Mono",monospace;font-size:11.5px;display:flex;align-items:center;gap:6px}
.card:hover .ext{color:var(--accent)}
.card .ext svg{width:14px;height:14px}
.gh-stars{font-family:"JetBrains Mono",monospace;font-size:11.5px;color:var(--ink-3)}

.cs-link{
  display:inline-flex;align-items:center;gap:7px;margin-top:2px;
  font-size:13.5px;font-weight:600;color:var(--accent-ink);position:relative;z-index:1;
}
.cs-link svg{width:14px;height:14px;transition:transform .2s}
.cs-link:hover svg{transform:translateX(3px)}

/* ============ Experience ============ */
.xp{border-left:1px solid var(--line);margin-left:6px}
.xp-item{position:relative;padding:0 0 48px 36px}
.xp-item:last-child{padding-bottom:8px}
.xp-item::before{
  content:"";position:absolute;left:-6.5px;top:6px;width:12px;height:12px;border-radius:50%;
  background:var(--bg);border:2px solid var(--ink-3);
}
.xp-item.current::before{border-color:var(--ok);background:var(--ok);box-shadow:0 0 0 4px var(--ok-soft)}
.xp-head{display:flex;flex-wrap:wrap;align-items:baseline;gap:6px 14px;margin-bottom:4px}
.xp-head h3{font-size:18.5px;font-weight:600;letter-spacing:-.015em}
.xp-co{color:var(--accent-ink);font-weight:600;font-size:15px}
.xp-meta{font-family:"JetBrains Mono",monospace;font-size:12px;color:var(--ink-3);margin-bottom:14px}
.xp ul{list-style:none;display:flex;flex-direction:column;gap:9px;max-width:68ch}
.xp li{font-size:14.5px;color:var(--ink-2);padding-left:18px;position:relative}
.xp li::before{content:"—";position:absolute;left:0;color:var(--accent);font-size:12px;top:2px}
.xp li strong{color:var(--ink);font-weight:600}
.xp .award{
  display:inline-flex;align-items:center;gap:8px;margin-top:14px;
  font-size:12.5px;font-weight:600;color:var(--accent-ink);
  background:var(--accent-soft);border:1px solid color-mix(in srgb,var(--accent) 25%,transparent);
  padding:6px 12px;border-radius:8px;
}

/* ============ Skills ============ */
.skills-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
@media(max-width:900px){.skills-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:520px){.skills-grid{grid-template-columns:1fr}}
.skill-group{background:var(--bg-raise);border:1px solid var(--line);border-radius:16px;padding:24px}
.skill-group h3{
  font-family:"JetBrains Mono",monospace;font-size:11.5px;letter-spacing:.12em;
  text-transform:uppercase;color:var(--ink-3);font-weight:500;margin-bottom:16px;
}
.skill-group ul{list-style:none;display:flex;flex-direction:column;gap:8px}
.skill-group li{font-size:14px;color:var(--ink-2);display:flex;align-items:center;gap:10px}
.skill-group li::before{content:"";width:5px;height:5px;border-radius:50%;background:var(--accent);flex-shrink:0}
.skill-group li.hl{color:var(--ink);font-weight:600}

/* ============ Quick facts ============ */
.facts{background:var(--bg-inset);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.facts-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:start}
@media(max-width:800px){.facts-grid{grid-template-columns:1fr}}
.facts dl{display:grid;grid-template-columns:max-content 1fr;gap:12px 24px;font-size:14.5px}
.facts dt{font-family:"JetBrains Mono",monospace;font-size:12px;color:var(--ink-3);padding-top:2px;letter-spacing:.04em}
.facts dd{color:var(--ink-2)}
.facts dd strong{color:var(--ink);font-weight:600}
.now-card{background:var(--bg-raise);border:1px solid var(--line);border-radius:16px;padding:26px}
.now-card h3{font-size:16px;font-weight:600;margin-bottom:14px;display:flex;align-items:center;gap:10px}
.now-card h3 .dot{width:7px;height:7px;border-radius:50%;background:var(--ok);box-shadow:0 0 0 4px var(--ok-soft)}
.now-card ul{list-style:none;display:flex;flex-direction:column;gap:10px}
.now-card li{font-size:14px;color:var(--ink-2);padding-left:18px;position:relative}
.now-card li::before{content:"▸";position:absolute;left:0;color:var(--accent);font-size:11px;top:3px}

/* ============ Education ============ */
.edu-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin-bottom:22px}
@media(max-width:700px){.edu-grid{grid-template-columns:1fr}}
.edu{background:var(--bg-raise);border:1px solid var(--line);border-radius:16px;padding:26px}
.edu .deg{font-size:17px;font-weight:600;letter-spacing:-.01em;margin-bottom:2px}
.edu .inst{color:var(--accent-ink);font-weight:500;font-size:14.5px}
.edu .yrs{font-family:"JetBrains Mono",monospace;font-size:12px;color:var(--ink-3);margin:8px 0 10px}
.edu p{font-size:13.5px;color:var(--ink-2)}
.awards{display:flex;flex-wrap:wrap;gap:10px}
.awards span{
  font-size:13px;font-weight:500;color:var(--ink-2);
  border:1px solid var(--line);background:var(--bg-raise);
  padding:8px 14px;border-radius:99px;
}
.awards span b{color:var(--ink);font-weight:600}

/* ============ Contact ============ */
.contact{text-align:center}
.contact h2{font-size:clamp(30px,5vw,48px);letter-spacing:-.03em}
.contact h2 .serif{color:var(--accent-ink);font-size:1.05em}
.contact>.wrap>p{color:var(--ink-2);max-width:54ch;margin:0 auto 34px}
.contact .actions{justify-content:center}
.contact .fineprint{font-size:13px;color:var(--ink-3);margin-top:26px}
.contact .fineprint a{color:var(--ink-2);border-bottom:1px solid var(--line)}
.contact .fineprint a:hover{color:var(--accent);border-color:var(--accent)}

footer.site{border-top:1px solid var(--line);padding:28px 0}
footer.site .wrap{display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;align-items:center}
footer.site p{font-size:13px;color:var(--ink-3)}
footer.site a{color:var(--ink-2);border-bottom:1px solid transparent}
footer.site a:hover{color:var(--accent)}
footer.site button{background:none;border:none;cursor:pointer;font-size:13px;color:var(--ink-2);padding:0}
footer.site button:hover{color:var(--accent)}

/* ============ Reveal ============ */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s ease}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
  .btn,.card{transition:none}
}

/* ============ Toast ============ */
#toast{
  position:fixed;bottom:28px;left:50%;transform:translate(-50%,20px);
  background:var(--ink);color:var(--bg);font-size:13.5px;font-weight:500;
  padding:10px 18px;border-radius:10px;opacity:0;pointer-events:none;
  transition:opacity .3s,transform .3s;z-index:120;
}
#toast.show{opacity:1;transform:translate(-50%,0)}

/* ============================================================
   Command palette
   ============================================================ */
.palette-veil{
  position:fixed;inset:0;z-index:100;background:rgba(4,6,10,.6);
  backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px);
  display:none;align-items:flex-start;justify-content:center;padding:14vh 20px 20px;
}
.palette-veil.open{display:flex}
.palette{
  width:min(560px,100%);background:var(--bg-raise);border:1px solid var(--line);
  border-radius:16px;box-shadow:var(--shadow-lg);overflow:hidden;
  animation:pal-in .16s ease;
}
@keyframes pal-in{from{opacity:0;transform:translateY(-8px) scale(.98)}}
@media (prefers-reduced-motion:reduce){.palette{animation:none}}
.palette input{
  width:100%;background:none;border:none;outline:none;color:var(--ink);
  font:500 15px/1 "Inter",sans-serif;padding:18px 20px;
  border-bottom:1px solid var(--line);
}
.palette input::placeholder{color:var(--ink-3)}
.palette-list{max-height:46vh;overflow-y:auto;padding:8px}
.palette-item{
  display:flex;align-items:center;gap:12px;width:100%;text-align:left;
  padding:11px 12px;border-radius:10px;border:none;background:none;cursor:pointer;
  font-size:14px;color:var(--ink-2);
}
.palette-item svg{width:15px;height:15px;color:var(--ink-3);flex-shrink:0}
.palette-item .hint{margin-left:auto;font-family:"JetBrains Mono",monospace;font-size:11px;color:var(--ink-3)}
.palette-item.sel{background:var(--accent-soft);color:var(--ink)}
.palette-item.sel svg{color:var(--accent)}
.palette-empty{padding:22px;text-align:center;color:var(--ink-3);font-size:13.5px}
.palette-foot{
  display:flex;gap:16px;padding:10px 16px;border-top:1px solid var(--line);
  font-family:"JetBrains Mono",monospace;font-size:11px;color:var(--ink-3);
}

/* ============================================================
   Terminal
   ============================================================ */
.term-veil{
  position:fixed;inset:0;z-index:110;background:rgba(4,6,10,.55);
  backdrop-filter:blur(3px);-webkit-backdrop-filter:blur(3px);
  display:none;align-items:center;justify-content:center;padding:20px;
}
.term-veil.open{display:flex}
.term{
  width:min(680px,100%);height:min(440px,80vh);display:flex;flex-direction:column;
  background:#0b0e13;border:1px solid #232a38;border-radius:14px;overflow:hidden;
  box-shadow:var(--shadow-lg);
  font-family:"JetBrains Mono",ui-monospace,monospace;font-size:13px;
}
.term-bar{
  display:flex;align-items:center;gap:8px;padding:10px 14px;
  background:#10141c;border-bottom:1px solid #232a38;flex-shrink:0;
}
.term-bar .tl{width:11px;height:11px;border-radius:50%}
.term-bar .r{background:#ff5f57}.term-bar .y{background:#febc2e}.term-bar .g{background:#28c840}
.term-bar span{margin-left:8px;color:#5f6879;font-size:11.5px}
.term-bar button{margin-left:auto;background:none;border:none;color:#5f6879;cursor:pointer;font-size:15px;line-height:1}
.term-bar button:hover{color:#e8ebf2}
.term-body{flex:1;overflow-y:auto;padding:14px 16px;color:#c9d1e0;line-height:1.7}
.term-body .ps1{color:#5fd39a}
.term-body .cmd{color:#e8ebf2}
.term-body .dim{color:#5f6879}
.term-body .acc{color:#ffb454}
.term-body a{color:#7cb8ff;text-decoration:underline}
.term-body pre{font:inherit;white-space:pre-wrap;word-break:break-word}
.term-input-row{display:flex;gap:8px;padding:4px 16px 14px;flex-shrink:0}
.term-input-row .ps1{color:#5fd39a}
.term-input-row input{
  flex:1;background:none;border:none;outline:none;color:#e8ebf2;
  font:inherit;caret-color:#ffb454;
}

/* ============================================================
   Case-study pages
   ============================================================ */
.cs-hero{padding:72px 0 48px}
.cs-hero .back{
  display:inline-flex;align-items:center;gap:8px;font-family:"JetBrains Mono",monospace;
  font-size:12.5px;color:var(--ink-3);margin-bottom:34px;transition:color .2s;
}
.cs-hero .back:hover{color:var(--accent)}
.cs-hero .back svg{width:14px;height:14px}
.cs-kicker{
  font-family:"JetBrains Mono",monospace;font-size:12.5px;letter-spacing:.1em;
  text-transform:uppercase;color:var(--accent);margin-bottom:16px;
}
.cs-hero h1{font-size:clamp(30px,4.6vw,46px);font-weight:700;letter-spacing:-.03em;line-height:1.12;max-width:22ch}
.cs-hero .sub{font-size:17px;color:var(--ink-2);max-width:60ch;margin-top:18px}
.cs-meta{
  display:flex;flex-wrap:wrap;gap:26px;margin-top:32px;padding-top:26px;border-top:1px solid var(--line);
}
.cs-meta div{font-size:13.5px}
.cs-meta .k{font-family:"JetBrains Mono",monospace;font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-3);margin-bottom:3px}
.cs-meta .v{color:var(--ink);font-weight:600}

.cs-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin:14px 0 8px}
@media(max-width:640px){.cs-stats{grid-template-columns:1fr}}
.cs-stat{background:var(--bg-raise);border:1px solid var(--line);border-radius:14px;padding:22px}
.cs-stat .n{font-family:"JetBrains Mono",monospace;font-size:27px;font-weight:500;letter-spacing:-.03em;color:var(--accent-ink)}
.cs-stat .l{font-size:12.5px;color:var(--ink-3);margin-top:4px;line-height:1.4}

.cs-body{padding:24px 0 96px}
.cs-body .wrap{max-width:820px}
.cs-body h2{font-size:22px;margin:52px 0 14px;display:flex;align-items:baseline;gap:12px}
.cs-body h2 .n{font-family:"JetBrains Mono",monospace;font-size:13px;color:var(--accent);font-weight:500}
.cs-body p{color:var(--ink-2);margin-bottom:16px;max-width:68ch}
.cs-body p strong,.cs-body li strong{color:var(--ink);font-weight:600}
.cs-body ul{list-style:none;display:flex;flex-direction:column;gap:10px;margin:0 0 16px}
.cs-body li{font-size:15px;color:var(--ink-2);padding-left:20px;position:relative}
.cs-body li::before{content:"—";position:absolute;left:0;color:var(--accent);font-size:12px;top:2px}
.cs-diagram{
  background:var(--bg-inset);border:1px solid var(--line);border-radius:16px;
  padding:28px;margin:24px 0;overflow-x:auto;
}
.cs-diagram svg{min-width:560px;width:100%;height:auto;display:block}
.cs-diagram .cap{font-family:"JetBrains Mono",monospace;font-size:11.5px;color:var(--ink-3);margin-top:14px;text-align:center}
.cs-note{
  font-size:13px;color:var(--ink-3);border-left:2px solid var(--line);
  padding:4px 0 4px 16px;margin:28px 0;
}
.cs-next{
  display:flex;flex-wrap:wrap;gap:14px;justify-content:space-between;align-items:center;
  margin-top:64px;padding:26px;background:var(--bg-raise);border:1px solid var(--line);border-radius:16px;
}
.cs-next p{margin:0;font-size:14px}
.cs-next .t{font-weight:600;color:var(--ink)}

/* diagram SVG shared classes */
.d-box{fill:var(--bg-raise);stroke:var(--line);rx:10}
.d-box-acc{fill:var(--accent-soft);stroke:var(--accent)}
.d-label{font:500 12px "JetBrains Mono",monospace;fill:var(--ink)}
.d-sub{font:400 10px "JetBrains Mono",monospace;fill:var(--ink-3)}
.d-edge{stroke:var(--ink-3);stroke-width:1.2;fill:none;marker-end:url(#arr)}
.d-edge-acc{stroke:var(--accent);stroke-width:1.4;fill:none;marker-end:url(#arrAcc)}

/* ============ 404 ============ */
.nf{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px}