/* ==========================================================================
   tw0h0ur3 — editorial / swiss-brutalist portfolio
   Design system: ui-ux-pro-max (Portfolio/Personal → Motion + Swiss,
   secondary Brutalism + Editorial Grid). Monochrome + single blue accent,
   sharp corners, visible rules, Archivo / Space Grotesk + CJK sans.
   ========================================================================== */

@font-face{font-family:"Archivo";src:url("/assets/fonts/archivo-400.woff2") format("woff2");font-weight:400;font-style:normal;font-display:swap}
@font-face{font-family:"Archivo";src:url("/assets/fonts/archivo-500.woff2") format("woff2");font-weight:500;font-style:normal;font-display:swap}
@font-face{font-family:"Archivo";src:url("/assets/fonts/archivo-700.woff2") format("woff2");font-weight:700;font-style:normal;font-display:swap}
@font-face{font-family:"Archivo";src:url("/assets/fonts/archivo-800.woff2") format("woff2");font-weight:800;font-style:normal;font-display:swap}
@font-face{font-family:"Space Grotesk";src:url("/assets/fonts/spacegrotesk-500.woff2") format("woff2");font-weight:500;font-style:normal;font-display:swap}
@font-face{font-family:"Space Grotesk";src:url("/assets/fonts/spacegrotesk-700.woff2") format("woff2");font-weight:700;font-style:normal;font-display:swap}

:root{
  --bg:#fafafa;
  --fg:#09090b;
  --card:#ffffff;
  --muted:#ececef;
  --muted-fg:#475569;
  --line:#dedee3;
  --edge:#18181b;
  --accent:#2563eb;
  --accent-fg:#ffffff;
  --chip:#f4f4f5;
  --sans:"Archivo","PingFang SC","Noto Sans SC","Microsoft YaHei","Hiragino Sans GB",sans-serif;
  --mono:"Space Grotesk","Archivo","PingFang SC","Microsoft YaHei",sans-serif;
  --wrap:1220px;
  --pad:28px;
  --ease:cubic-bezier(.2,.8,.2,1);
  --step:clamp(56px,7vw,96px);
}
:root[data-theme="dark"]{
  --bg:#09090b;
  --fg:#fafafa;
  --card:#111113;
  --muted:#1c1c1f;
  --muted-fg:#a1a1aa;
  --line:#27272a;
  --edge:#3f3f46;
  --accent:#60a5fa;
  --accent-fg:#09090b;
  --chip:#18181b;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:96px;-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--bg);color:var(--fg);
  font-family:var(--sans);font-size:16px;line-height:1.7;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  overflow-x:hidden;overflow-x:clip;
}
body::selection{background:var(--accent);color:var(--accent-fg)}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4,p,figure,dl,dd{margin:0}
h1,h2,h3,h4{font-weight:800;line-height:1.15;letter-spacing:-.02em}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
::selection{background:var(--accent);color:var(--accent-fg)}
.skip{
  position:fixed;left:12px;top:-60px;z-index:200;background:var(--fg);color:var(--bg);
  padding:10px 16px;font-size:13px;transition:top .18s var(--ease)
}
.skip:focus{top:12px}

.wrap{max-width:var(--wrap);margin:0 auto;padding:0 var(--pad)}
.eyebrow,.sec-no,.side-label,.tag,.pnum,.cat,.code-label{
  font-family:var(--mono);font-weight:500;letter-spacing:.14em;text-transform:uppercase
}
.dot{display:inline-block;width:8px;height:8px;background:var(--accent);margin-right:10px;vertical-align:1px}

/* ---------- progress ---------- */
.progress{
  position:fixed;left:0;top:0;height:3px;width:100%;transform-origin:0 50%;
  transform:scaleX(0);background:var(--accent);z-index:120;pointer-events:none
}

/* ---------- header ---------- */
.head{
  position:sticky;top:0;z-index:100;background:var(--bg);
  border-bottom:1px solid var(--line)
}
.head.is-stuck{border-bottom-color:var(--edge)}
.head-in{display:flex;align-items:center;gap:28px;height:72px}
.brand{display:flex;align-items:center;gap:12px;margin-right:auto;min-width:0}
.brand-avatar{width:34px;height:34px;border:1px solid var(--edge);object-fit:cover}
.brand-name{font-weight:800;font-size:17px;letter-spacing:-.01em}
.brand-sub{
  display:none;font-family:var(--mono);font-size:10.5px;letter-spacing:.16em;
  color:var(--muted-fg);border-left:1px solid var(--line);padding-left:12px
}
.nav{display:flex;align-items:center;gap:4px}
.nav a{
  position:relative;padding:10px 14px;font-size:14px;font-weight:500;
  transition:color .16s var(--ease)
}
.nav a::after{
  content:"";position:absolute;left:14px;right:14px;bottom:5px;height:2px;
  background:var(--fg);transform:scaleX(0);transform-origin:0 50%;
  transition:transform .2s var(--ease)
}
.nav a:hover::after,.nav a.is-active::after{transform:scaleX(1)}
.nav .nav-mail{
  margin-left:12px;background:var(--fg);color:var(--bg);padding:10px 18px;
  border:1px solid var(--fg);transition:background .16s,color .16s
}
.nav .nav-mail::after{display:none}
.nav .nav-mail:hover{background:var(--accent);border-color:var(--accent);color:var(--accent-fg)}
.theme{
  flex:none;width:40px;height:40px;display:grid;place-items:center;
  border:1px solid var(--edge);background:transparent;transition:background .16s,color .16s
}
.theme:hover{background:var(--fg);color:var(--bg)}
.theme svg{width:18px;height:18px}
.theme .i-sun{display:none}
:root[data-theme="dark"] .theme .i-moon{display:none}
:root[data-theme="dark"] .theme .i-sun{display:block}

/* ---------- hero ---------- */
.hero{padding:clamp(48px,7vw,92px) 0 0;border-bottom:1px solid var(--edge)}
.hero-grid{
  display:grid;grid-template-columns:minmax(0,8fr) minmax(280px,4fr);
  gap:clamp(28px,4vw,64px);padding-bottom:clamp(40px,5vw,64px)
}
.kicker{
  display:inline-flex;align-items:center;font-family:var(--mono);font-size:11.5px;
  letter-spacing:.18em;text-transform:uppercase;color:var(--muted-fg);
  border:1px solid var(--line);padding:8px 12px;margin-bottom:30px
}
.hero h1{
  font-size:clamp(42px,7.2vw,96px);line-height:1.03;letter-spacing:-.045em;
  margin:0 0 28px;max-width:13em
}
.hero h1 em{font-style:normal;color:var(--accent)}
.hero .lead{
  max-width:640px;font-size:clamp(15px,1.25vw,17px);line-height:1.85;color:var(--muted-fg)
}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:36px}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:48px;
  padding:0 22px;border:1px solid var(--fg);background:var(--fg);color:var(--bg);
  font-size:14px;font-weight:600;letter-spacing:.02em;
  transition:background .16s var(--ease),color .16s var(--ease),transform .16s var(--ease)
}
.btn:hover{background:var(--accent);border-color:var(--accent);color:var(--accent-fg)}
.btn:active{transform:translate(2px,2px)}
.btn.ghost{background:transparent;color:var(--fg)}
.btn.ghost:hover{background:var(--fg);color:var(--bg);border-color:var(--fg)}
.btn svg{width:16px;height:16px}

.hero-side{
  border-left:1px solid var(--edge);padding-left:clamp(20px,3vw,40px);
  display:flex;flex-direction:column;justify-content:space-between;gap:32px
}
.side-label{font-size:10.5px;color:var(--muted-fg);margin-bottom:2px}
.stats{display:flex;flex-direction:column}
.stats li{
  display:flex;align-items:baseline;justify-content:space-between;gap:16px;
  padding:16px 0;border-top:1px solid var(--line)
}
.stats li:first-child{border-top:1px solid var(--edge)}
.stats b{font-family:var(--mono);font-weight:700;font-size:clamp(22px,2vw,30px);letter-spacing:-.02em}
.stats span{font-size:12px;color:var(--muted-fg);text-align:right}
.side-note{font-size:12.5px;line-height:1.8;color:var(--muted-fg);border-top:1px solid var(--line);padding-top:16px}
.hero-foot{
  border-top:1px solid var(--edge);display:flex;align-items:center;justify-content:space-between;
  gap:20px;padding:14px 0;font-family:var(--mono);font-size:10.5px;
  letter-spacing:.16em;text-transform:uppercase;color:var(--muted-fg)
}
.hero-foot span:last-child{display:inline-flex;align-items:center;gap:8px}
.hero-foot svg{width:14px;height:14px}

/* ---------- blocks / section headers ---------- */
.block{padding:var(--step) 0;border-bottom:1px solid var(--line)}
.block:last-of-type{border-bottom:0}
.sec-head{
  display:grid;grid-template-columns:56px minmax(0,1fr) auto;align-items:end;
  gap:16px;border-bottom:1px solid var(--edge);padding-bottom:16px;margin-bottom:clamp(28px,4vw,44px)
}
.sec-no{font-size:12px;color:var(--accent);padding-bottom:6px}
.sec-head h2{font-size:clamp(28px,3.6vw,44px);letter-spacing:-.03em}
.sec-side{font-size:11.5px;color:var(--muted-fg);text-align:right;line-height:1.6;padding-bottom:6px}
.sec-intro{max-width:760px;font-size:14px;line-height:1.9;color:var(--muted-fg);margin:-16px 0 32px}

/* ---------- filters ---------- */
.filters{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 30px}
.pill{
  min-height:40px;padding:0 16px;border:1px solid var(--line);
  font-family:var(--mono);font-size:11.5px;letter-spacing:.1em;color:var(--muted-fg);
  transition:border-color .16s,background .16s,color .16s
}
.pill:hover{border-color:var(--edge);color:var(--fg)}
.pill.is-on{background:var(--fg);border-color:var(--fg);color:var(--bg)}

/* ---------- project cards ---------- */
.projects{
  display:grid;grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(16px,2.4vw,28px)
}
.pcard{
  position:relative;background:var(--card);border:1px solid var(--edge);
  display:flex;flex-direction:column;
  transition:transform .2s var(--ease),box-shadow .2s var(--ease)
}
.pcard:hover{transform:translate(-4px,-4px);box-shadow:5px 5px 0 var(--edge)}
.pcover{position:relative;aspect-ratio:4/3;overflow:hidden;border-bottom:1px solid var(--edge);background:var(--muted)}
.pcover img{
  width:100%;height:100%;object-fit:cover;
  filter:grayscale(1) contrast(1.04);
  transition:filter .45s var(--ease),transform .6s var(--ease)
}
.pcard:hover .pcover img,.pcard:focus-within .pcover img{filter:grayscale(0);transform:scale(1.035)}
.cat{
  position:absolute;left:0;top:0;background:var(--fg);color:var(--bg);
  padding:7px 10px;font-size:10px;letter-spacing:.14em
}
.pnum{
  position:absolute;right:12px;top:12px;background:var(--bg);color:var(--fg);
  border:1px solid var(--edge);padding:4px 8px;font-size:11px;letter-spacing:.08em
}
.pbody{padding:20px 20px 0;display:flex;flex-direction:column;flex:1}
.pbody h3{font-size:20px;line-height:1.35;letter-spacing:-.02em}
.pdesc{margin-top:12px;font-size:13.5px;line-height:1.75;color:var(--muted-fg)}
.pfoot{
  margin-top:auto;padding:16px 0;border-top:1px solid var(--line);
  display:flex;align-items:center;justify-content:space-between;gap:12px
}
.tags{display:flex;flex-wrap:wrap;gap:6px}
.tags li{border:1px solid var(--line);padding:2px 7px;font-size:10.5px;color:var(--muted-fg)}
.more{font-size:12px;font-weight:600;color:var(--accent);white-space:nowrap}
.stretch{position:absolute;inset:0;z-index:2}
.pcard.is-hidden{display:none}

/* ---------- about ---------- */
.about-grid{display:grid;grid-template-columns:minmax(0,7fr) minmax(260px,4fr);gap:clamp(28px,5vw,72px)}
.prose{font-size:16px;line-height:1.95}
.prose p + p{margin-top:18px}
.prose p:first-child::first-letter{
  float:left;font-family:var(--sans);font-weight:800;font-size:3.5em;line-height:.86;
  padding:6px 12px 0 0;color:var(--accent)
}
.about-side{border-top:1px solid var(--edge)}
.fact{display:flex;justify-content:space-between;gap:16px;padding:14px 0;border-bottom:1px solid var(--line);font-size:13px}
.fact dt{color:var(--muted-fg);font-family:var(--mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase}
.fact dd{text-align:right;font-weight:500}

/* ---------- contact ---------- */
.contact{display:grid;grid-template-columns:minmax(0,1fr) 220px;gap:32px;align-items:end}
.contact-label{font-family:var(--mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted-fg);margin-bottom:18px}
.mail{
  display:inline-block;font-family:var(--mono);font-weight:700;letter-spacing:-.02em;
  font-size:clamp(22px,4.2vw,52px);line-height:1.1;border-bottom:2px solid var(--edge);
  transition:color .16s,border-color .16s
}
.mail:hover{color:var(--accent);border-color:var(--accent)}
.copy{
  min-height:44px;padding:0 18px;border:1px solid var(--edge);
  font-size:13px;transition:background .16s,color .16s
}
.copy:hover{background:var(--fg);color:var(--bg)}
.contact .copy{justify-self:start}
.contact-note{margin-top:14px;font-size:12.5px;color:var(--muted-fg)}

/* ---------- footer ---------- */
.foot{border-top:1px solid var(--edge);padding:clamp(40px,5vw,64px) 0 128px;background:var(--bg)}
.foot-grid{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:32px;align-items:end}
.foot-mark{font-family:var(--mono);font-weight:700;font-size:clamp(34px,6vw,72px);letter-spacing:-.04em;line-height:1}
.foot-links{display:flex;flex-wrap:wrap;gap:8px 22px;margin-top:18px;font-size:13px;color:var(--muted-fg)}
.foot-links a{border-bottom:1px solid transparent}
.foot-links a:hover{color:var(--fg);border-color:var(--fg)}
.foot-meta{text-align:right;font-size:12px;line-height:1.9;color:var(--muted-fg)}
.sep{margin:0 8px;color:var(--line)}

/* ---------- player ---------- */
.player{
  position:fixed;right:20px;bottom:20px;z-index:110;display:flex;align-items:stretch;
  background:var(--fg);color:var(--bg);border:1px solid var(--fg);
  box-shadow:4px 4px 0 var(--edge)
}
.pbtn,.pnext{width:46px;min-height:46px;display:grid;place-items:center;flex:none}
.pbtn{border-right:1px solid color-mix(in srgb,var(--bg) 30%,transparent)}
.pnext{border-left:1px solid color-mix(in srgb,var(--bg) 30%,transparent)}
.pbtn:hover,.pnext:hover{background:var(--accent);color:var(--accent-fg)}
.pbtn svg,.pnext svg{width:17px;height:17px}
.player .i-pause{display:none}
.player[data-playing="true"] .i-play{display:none}
.player[data-playing="true"] .i-pause{display:block}
.player[data-playing="true"] .pbtn{background:var(--accent);color:var(--accent-fg)}
.ptrack{display:flex;flex-direction:column;justify-content:center;min-width:0;padding:0 14px;max-width:210px}
.plabel{font-family:var(--mono);font-size:9px;letter-spacing:.18em;opacity:.65}
.ptitle{font-size:12px;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;line-height:1.4}
.player-note{
  position:fixed;right:20px;bottom:78px;z-index:110;background:var(--bg);border:1px solid var(--edge);
  padding:6px 10px;font-size:11px;color:var(--muted-fg);opacity:0;transform:translateY(6px);
  pointer-events:none;transition:opacity .2s,transform .2s
}
.player-note.show{opacity:1;transform:none}

/* ---------- toast ---------- */
.toast{
  position:fixed;left:50%;bottom:28px;transform:translate(-50%,12px);z-index:140;
  background:var(--fg);color:var(--bg);border:1px solid var(--fg);padding:10px 16px;
  font-size:13px;opacity:0;pointer-events:none;transition:opacity .2s,transform .2s
}
.toast.show{opacity:1;transform:translate(-50%,0)}

/* ---------- project page ---------- */
.crumb{padding:30px 0 0;font-size:12px;color:var(--muted-fg);display:flex;gap:8px;flex-wrap:wrap}
.crumb a{border-bottom:1px solid transparent}
.crumb a:hover{border-color:var(--fg);color:var(--fg)}
.crumb i{font-style:normal;color:var(--line)}
.page-head{padding:28px 0 clamp(30px,4vw,48px);border-bottom:1px solid var(--edge)}
.cat-line{display:flex;align-items:center;font-family:var(--mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted-fg);margin-bottom:18px}
.page-head h1{font-size:clamp(40px,6.4vw,82px);line-height:1.04;letter-spacing:-.04em;max-width:16em}
.page-head .sub{margin-top:20px;max-width:720px;font-size:15.5px;line-height:1.85;color:var(--muted-fg)}
.page-meta{
  display:grid;grid-template-columns:repeat(4,minmax(0,1fr));
  border:1px solid var(--edge);margin-top:36px
}
.page-meta li{padding:18px 20px;border-right:1px solid var(--edge);display:flex;flex-direction:column;gap:6px}
.page-meta li:last-child{border-right:0}
.page-meta b{font-family:var(--mono);font-size:clamp(18px,2vw,26px);letter-spacing:-.02em;line-height:1.1}
.page-meta span{font-size:11.5px;color:var(--muted-fg)}
.page-cover{margin:clamp(28px,4vw,44px) 0 0;border:1px solid var(--edge);aspect-ratio:21/9;overflow:hidden}
.page-cover img{width:100%;height:100%;object-fit:cover}
.page-body{max-width:920px;margin:0 auto;padding-top:8px}
.page-body > section{counter-increment:sec}
.page-body{counter-reset:sec}
.sec-title{
  display:flex;align-items:baseline;gap:14px;margin:clamp(44px,5vw,64px) 0 20px;
  padding-top:14px;border-top:1px solid var(--edge);
  font-size:20px;font-weight:800;letter-spacing:-.02em
}
.sec-title::before{
  content:"0" counter(sec);font-family:var(--mono);font-size:11px;font-weight:500;
  letter-spacing:.12em;color:var(--accent)
}
.panel{background:var(--card);border:1px solid var(--edge);padding:clamp(20px,3vw,30px)}
.panel .prose{font-size:15.5px;line-height:1.95}
.credit{margin-top:16px;padding-top:14px;border-top:1px solid var(--line);font-size:12px;color:var(--muted-fg)}
.note{margin-top:18px;padding-left:12px;border-left:2px solid var(--accent);font-size:12.5px;line-height:1.8;color:var(--muted-fg)}
.kv{display:grid;grid-template-columns:1fr 1fr;border-top:1px solid var(--line);border-left:1px solid var(--line)}
.kv div{display:flex;justify-content:space-between;gap:16px;padding:13px 14px;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}
.kv dt{font-size:12px;color:var(--muted-fg);white-space:nowrap}
.kv dd{font-size:13px;text-align:right;font-weight:500}
.stack{display:flex;flex-wrap:wrap;gap:6px;margin-top:18px}
.stack li{border:1px solid var(--line);padding:4px 9px;font-size:11.5px;color:var(--muted-fg)}
.steps{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));border:1px solid var(--edge);counter-reset:st}
.steps li{padding:20px;border-right:1px solid var(--edge);counter-increment:st;position:relative}
.steps li:last-child{border-right:0}
.steps li::before{
  content:"0" counter(st);font-family:var(--mono);font-size:11px;color:var(--accent);
  display:block;margin-bottom:26px
}
.steps h3{font-size:15.5px;line-height:1.4;margin-bottom:8px}
.steps p{font-size:12.5px;line-height:1.75;color:var(--muted-fg)}
.pager{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:clamp(44px,5vw,64px) 0 0}
.pager a{border:1px solid var(--edge);padding:18px 20px;transition:background .16s,color .16s}
.pager a:hover{background:var(--fg);color:var(--bg)}
.pager small{display:block;font-family:var(--mono);font-size:10px;letter-spacing:.16em;text-transform:uppercase;opacity:.6}
.pager strong{display:block;margin-top:6px;font-size:15px;font-weight:600;line-height:1.5}
.pager .next{text-align:right}
.pager .next.solo{grid-column:2}
.pager .back{grid-column:1/-1;text-align:center}
.pager .back strong{color:var(--accent);font-size:13px}
.pager .back:hover strong{color:var(--accent-fg)}

/* ---------- book structure ---------- */
.bgroups{display:flex;flex-direction:column;gap:30px}
.bgroup + .bgroup{padding-top:26px;border-top:1px solid var(--line)}
.bgroup-head{display:flex;flex-wrap:wrap;align-items:baseline;gap:12px;margin-bottom:14px}
.bgroup-head h3{font-size:16px;font-weight:800}
.bgroup-meta{font-family:var(--mono);font-size:11px;color:var(--muted-fg)}
.bgroup-head p{flex-basis:100%;font-size:12px;color:var(--muted-fg);line-height:1.7}
.bparts{display:flex;flex-direction:column;gap:8px}
.bpart{border:1px solid var(--line);background:var(--card)}
.bpart[open]{border-color:var(--edge)}
.bpart summary{
  display:grid;grid-template-columns:44px minmax(0,1fr) auto 20px;align-items:center;
  gap:10px;padding:14px 16px;cursor:pointer;list-style:none
}
.bpart summary::-webkit-details-marker{display:none}
.bpart summary:hover{background:var(--muted)}
.bnum{font-family:var(--mono);font-size:11px;color:var(--accent);letter-spacing:.08em}
.btitle{font-size:14px;font-weight:600;line-height:1.5}
.bhot{margin-left:8px;font-size:9px;letter-spacing:.1em;color:#b45309;font-weight:400;white-space:nowrap}
:root[data-theme="dark"] .bhot{color:#fbbf24}
.bmeta{font-family:var(--mono);font-size:10.5px;color:var(--muted-fg);white-space:nowrap}
.bchev{width:8px;height:8px;border-right:1px solid var(--fg);border-bottom:1px solid var(--fg);transform:rotate(45deg);transition:transform .2s var(--ease)}
.bpart[open] .bchev{transform:rotate(-135deg)}
.btoc{display:grid;grid-template-columns:1fr 1fr;gap:0 28px;padding:10px 18px 16px 70px;border-top:1px solid var(--line)}
.btoc li{display:flex;justify-content:space-between;gap:12px;padding:7px 0;border-bottom:1px dotted var(--line);font-size:12.5px}
.btoc a{color:var(--muted-fg)}
.btoc a:hover{color:var(--accent)}
.btoc span{font-family:var(--mono);font-size:10.5px;color:var(--muted-fg)}
.bpart-foot{padding:0 16px 16px 70px}
.read-cta{display:inline-flex;align-items:center;gap:12px;flex-wrap:wrap;border:1px solid var(--edge);background:var(--fg);color:var(--bg);padding:12px 18px;font-size:13px;font-weight:600}
.read-cta:hover{background:var(--accent);border-color:var(--accent);color:var(--accent-fg)}
.read-cta span{font-family:var(--mono);font-size:10.5px;letter-spacing:.1em;opacity:.75}
.bread-link{border-bottom:1px solid transparent;color:var(--accent);font-size:13px}
.bread-link:hover{border-color:var(--accent)}

/* ---------- book reader ---------- */
.read-wrap{max-width:1180px}
.read-head{padding:28px 0 32px;border-bottom:1px solid var(--edge)}
.read-head h1{font-size:clamp(30px,4.4vw,52px);line-height:1.15;letter-spacing:-.03em}
.read-head .cat-line{margin-bottom:14px}
.read-head .sub{margin-top:14px;font-size:13px;line-height:1.9;color:var(--muted-fg)}
.read-tools{display:flex;flex-wrap:wrap;gap:16px;margin-top:18px;padding-top:14px;border-top:1px solid var(--line);font-size:12px;color:var(--muted-fg)}
.read-tools a{color:var(--muted-fg)}
.read-tools a:hover{color:var(--accent)}
.read-tools .rt-next{margin-left:auto}
.read-tools .rt-next a{color:var(--accent)}
.read-grid{display:grid;grid-template-columns:minmax(0,1fr) 264px;gap:clamp(28px,4vw,48px);padding:36px 0 0}
.read-body{font-size:16px;line-height:1.95;min-width:0}
.read-body h2{font-size:24px;margin:48px 0 16px;padding-top:16px;border-top:1px solid var(--edge);letter-spacing:-.02em}
.read-body h3{font-size:18px;margin:32px 0 10px;letter-spacing:-.01em}
.read-body h4{margin:22px 0 8px;font-size:15px}
.read-body p{margin:0 0 14px}
.read-body ul,.read-body ol{margin:0 0 18px;padding-left:1.4em;list-style:revert}
.read-body li{margin:4px 0}
.read-body li > p{margin:0 0 6px}
.read-body strong{font-weight:700}
.read-body a{color:var(--accent);border-bottom:1px solid color-mix(in srgb,var(--accent) 40%,transparent)}
.read-body blockquote{margin:18px 0;padding:14px 18px;border-left:3px solid var(--accent);background:var(--muted);font-size:14.5px;color:var(--muted-fg)}
.read-body blockquote p{margin:0}
.book-note{margin:16px 0;padding:12px 16px;border:1px solid var(--line);border-left:3px solid var(--accent);background:var(--card);font-size:13px}
.read-body code{font-family:var(--mono);font-size:.9em;background:var(--muted);padding:1px 5px}
.read-body img{margin:20px auto;border:1px solid var(--line);max-width:100%}
.table-wrap{overflow-x:auto;margin:18px 0;border:1px solid var(--line)}
.read-body table{border-collapse:collapse;width:100%;min-width:520px;font-size:13px}
.read-body th,.read-body td{border-bottom:1px solid var(--line);border-right:1px solid var(--line);padding:9px 11px;text-align:left;vertical-align:top}
.read-body th{background:var(--chip);font-weight:600;white-space:nowrap}
.read-body tr:last-child td{border-bottom:0}
.read-body th:last-child,.read-body td:last-child{border-right:0}
.read-aside{position:sticky;top:96px;align-self:start;border-left:1px solid var(--edge);padding-left:22px}
.ra-title{font-family:var(--mono);font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted-fg);margin-bottom:10px}
.ra-list li{border-top:1px solid var(--line)}
.ra-list li:first-child{border-top:0}
.ra-list a{display:block;padding:7px 0;font-size:12.5px;line-height:1.6;color:var(--muted-fg)}
.ra-list a:hover{color:var(--accent)}
.ra-back{display:inline-block;margin-top:12px;font-size:12px;color:var(--accent)}
.read-toc-m{display:none;margin:20px 0 0;padding:0 14px;border:1px solid var(--line);background:var(--card)}
.read-toc-m summary{padding:12px 0;font-size:13px;cursor:pointer}
.read-toc-m .ra-list a{padding:9px 0}
.read-pager{margin-top:48px}
.read-index .page-head{padding-top:20px}
.read-note{margin-top:20px;padding:12px 16px;border:1px solid var(--line);background:var(--card);font-size:12.5px;line-height:1.8;color:var(--muted-fg)}
.bk-groups{display:flex;flex-direction:column;gap:36px;margin-top:42px;max-width:960px}
.bk-group-head{display:flex;align-items:baseline;gap:12px;flex-wrap:wrap;padding-bottom:10px;border-bottom:1px solid var(--edge)}
.bk-group-head h2{font-size:18px}
.bk-group-head span{font-family:var(--mono);font-size:11px;color:var(--muted-fg)}
.bk-group-head p{flex-basis:100%;font-size:12px;color:var(--muted-fg);line-height:1.7}
.bk-list{display:flex;flex-direction:column}
.bk-card{border-bottom:1px solid var(--line);padding:14px 10px;display:grid;grid-template-columns:40px minmax(0,1fr) auto;align-items:center;gap:12px;transition:background .16s}
.bk-card:hover{background:var(--muted)}
.bk-num{font-family:var(--mono);font-size:11px;color:var(--accent)}
.bk-title{font-size:14px;font-weight:600;line-height:1.6}
.bk-hot{margin-left:6px;font-size:9px;letter-spacing:.1em;color:#b45309;font-weight:400}
:root[data-theme="dark"] .bk-hot{color:#fbbf24}
.bk-meta{font-family:var(--mono);font-size:10.5px;color:var(--muted-fg);white-space:nowrap}
.read-foot{margin-top:40px;padding-top:16px;border-top:1px solid var(--line);font-size:12px;color:var(--muted-fg);display:flex;gap:16px;flex-wrap:wrap}
.read-foot a{color:var(--accent)}

/* ---------- 404 ---------- */
.nf{min-height:78vh;display:grid;place-items:center;padding:60px 0}
.nf-box{border:1px solid var(--edge);padding:clamp(32px,6vw,64px);max-width:560px;text-align:left;background:var(--card)}
.nf-code{font-family:var(--mono);font-size:clamp(64px,14vw,140px);font-weight:700;line-height:.9;letter-spacing:-.06em;color:var(--accent)}
.nf-box h1{font-size:26px;margin:18px 0 8px}
.nf-box p:not(.nf-code){font-size:14px;color:var(--muted-fg);margin-bottom:24px}

/* ---------- motion ---------- */
/* base state stays visible: if the observer or JS ever fails, content is still readable */
.reveal{opacity:1}
.js .reveal.is-in{animation:revealUp .62s var(--ease) var(--d,0s) both}
@keyframes revealUp{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:none}}
@view-transition{navigation:auto}
::view-transition-old(root){animation:vt-out .16s var(--ease) both}
::view-transition-new(root){animation:vt-in .24s var(--ease) both}
@keyframes vt-out{to{opacity:0}}
@keyframes vt-in{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important}
  .js .reveal{opacity:1;transform:none}
  .pcard:hover{transform:none;box-shadow:none}
  .pcover img{filter:none}
}

/* ---------- responsive ---------- */
@media (max-width:1080px){
  .hero-grid{grid-template-columns:1fr}
  .hero-side{border-left:0;border-top:1px solid var(--edge);padding:24px 0 0;display:grid;grid-template-columns:1fr 1fr;gap:24px 32px}
  .hero-side .side-note{grid-column:1/-1}
  .stats{display:grid;grid-template-columns:1fr 1fr}
  .stats li{display:flex;flex-direction:column;align-items:flex-start;gap:4px;border-top:1px solid var(--line);padding:14px 0}
  .stats li:first-child{border-top:1px solid var(--line)}
  .stats span{text-align:left}
  .projects{grid-template-columns:repeat(2,minmax(0,1fr))}
  .about-grid{grid-template-columns:1fr;gap:36px}
  .steps{grid-template-columns:1fr 1fr}
  .steps li:nth-child(2){border-right:0}
  .steps li:nth-child(n+3){border-top:1px solid var(--edge)}
  .read-grid{grid-template-columns:1fr}
  .read-aside{display:none}
  .read-toc-m{display:block}
  .contact{grid-template-columns:1fr;align-items:start}
}

@media (max-width:720px){
  :root{--pad:20px;--step:56px}
  .head-in{height:62px;gap:10px}
  .brand-sub{display:none}
  .brand-name{font-size:15px}
  .nav a{padding:9px 9px;font-size:12.5px}
  .nav .nav-mail{margin-left:4px;padding:9px 12px}
  .theme{width:36px;height:36px}
  .hero{padding-top:36px}
  .hero h1{font-size:clamp(36px,11vw,54px);letter-spacing:-.035em}
  .kicker{font-size:10px;padding:7px 10px;margin-bottom:20px}
  .hero-actions .btn{flex:1;min-width:140px}
  .hero-side{grid-template-columns:1fr;gap:10px}
  .side-note{font-size:12px}
  .sec-head{grid-template-columns:36px minmax(0,1fr);gap:8px}
  .sec-side{grid-column:2;text-align:left;padding-bottom:0}
  .projects{grid-template-columns:1fr}
  .page-meta{grid-template-columns:1fr 1fr}
  .page-meta li:nth-child(2n){border-right:0}
  .page-meta li:nth-child(n+3){border-top:1px solid var(--edge)}
  .page-cover{aspect-ratio:4/3}
  .steps{grid-template-columns:1fr}
  .steps li{border-right:0;border-top:1px solid var(--edge)}
  .steps li:first-child{border-top:0}
  .kv{grid-template-columns:1fr}
  .contact .mail{font-size:clamp(18px,5.8vw,26px)}
  .foot-grid{grid-template-columns:1fr}
  .foot-meta{text-align:left}
  .pager{grid-template-columns:1fr}
  .pager .next{text-align:left}
  .pager .next.solo{grid-column:auto}
  .btoc{grid-template-columns:1fr;padding:8px 14px 12px 20px}
  .bpart summary{grid-template-columns:32px minmax(0,1fr) 16px;padding:12px 12px}
  .bmeta{display:none}
  .bpart-foot{padding:0 12px 14px 20px}
  .bgroup-head h3{font-size:15px}
  .read-head h1{font-size:26px}
  .read-body{font-size:15px;line-height:1.9}
  .read-body h2{font-size:20px;margin-top:36px}
  .read-body h3{font-size:16.5px;margin-top:26px}
  .read-body table{min-width:440px}
  .read-body th,.read-body td{padding:7px 8px;font-size:12px}
  .bk-card{grid-template-columns:32px minmax(0,1fr);padding:12px 4px}
  .bk-meta{grid-column:2;white-space:normal}
  .player{right:10px;bottom:10px;box-shadow:3px 3px 0 var(--edge)}
  .ptrack{max-width:120px;padding:0 10px}
  .ptitle{font-size:11px}
  .pbtn,.pnext{width:44px;min-height:44px}
  .player-note{right:10px;bottom:66px}
  .prose p:first-child::first-letter{float:none;font-size:inherit;line-height:inherit;padding:0;color:inherit;font-weight:inherit}
  .foot{padding-bottom:104px}
  .toast{left:10px;right:10px;bottom:80px;transform:translateY(12px);text-align:center}
  .toast.show{transform:none}
}

@media print{
  .head,.theme,.filters,.player,.player-note,.toast,.progress,.skip,.pager,.pcard:hover{display:none !important}
  body{background:#fff;color:#000}
  .block,.panel,.pcard{break-inside:avoid;box-shadow:none}
  .page-cover{aspect-ratio:auto}
}

/* ---------- v13 additions ---------- */
.ripple{position:absolute;border-radius:50%;background:currentColor;opacity:.18;transform:scale(0);animation:ripple .55s ease-out forwards;pointer-events:none}
@keyframes ripple{to{transform:scale(2.4);opacity:0}}
main.is-loading{opacity:.4;transition:opacity .18s var(--ease)}
.nav a.is-active:not(.nav-mail){color:var(--fg)}
.nav a.is-active::after{transform:scaleX(1)}
.gcards{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:40px}
.gcard{position:relative;display:block;overflow:hidden;background:#111;color:#fff;aspect-ratio:3/4}
.gcard-img img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .8s var(--ease)}
.gcard::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 40%,rgba(0,0,0,.76))}
.gcard:hover .gcard-img img{transform:scale(1.05)}
.gcard-txt{position:absolute;z-index:1;left:18px;right:18px;bottom:16px}
.gcard-txt b{display:block;font-family:"Noto Serif SC","Songti SC",serif;font-size:18px;font-weight:600;letter-spacing:.02em}
.gcard-txt i{display:block;margin-top:5px;font-style:normal;font-size:11px;opacity:.76;letter-spacing:.06em}
@media (max-width:960px){.gcards{grid-template-columns:1fr 1fr}}
@media (max-width:640px){.gcards{gap:10px}.gcard{aspect-ratio:4/5}.gcard-txt b{font-size:15px}}


.game-link{display:grid;grid-template-columns:auto 1fr auto;gap:18px;align-items:baseline;margin:26px 0 0;padding:20px 22px;border:1px solid var(--line);background:var(--card);transition:border-color .2s,transform .2s}
.game-link:hover{border-color:var(--fg);transform:translateY(-2px)}
.game-link span{font-family:var(--mono);font-size:10px;letter-spacing:.18em;text-transform:uppercase;color:var(--muted-fg)}
.game-link strong{font-family:"Noto Serif SC","Songti SC",serif;font-size:20px;font-weight:600}
.game-link i{font-style:normal;font-size:12px;color:var(--muted-fg)}
@media (max-width:640px){.game-link{grid-template-columns:1fr;gap:6px}.game-link i{display:none}}
/* ================= v17 · per-page interaction layer ================= */
.progress.fx-live{transform:scaleX(var(--p,0));transition:transform .08s linear}

/* --- shared click feedback --- */
.fx-ring{position:fixed;width:18px;height:18px;margin:-9px 0 0 -9px;border:1px solid var(--accent,#3f73ad);border-radius:50%;pointer-events:none;z-index:90;animation:fxRing .7s cubic-bezier(.2,.7,.2,1) forwards}
@keyframes fxRing{0%{opacity:.8;transform:scale(.35)}100%{opacity:0;transform:scale(5)}}

/* --- home: magnetic cards + pointer tilt --- */
body[data-page="home"] .pcard{transform:translate3d(var(--mx,0px),var(--my,0px),0)}
.pcard.fx-tilt,.ab-portrait.fx-tilt,.gprofile-img.fx-tilt{transition:transform .4s cubic-bezier(.2,.7,.2,1),box-shadow .4s ease;will-change:transform}
.pcard.fx-tilt:hover{box-shadow:0 28px 64px -36px rgba(18,28,42,.5)}

/* --- games index: cursor peek label --- */
.fx-peek{position:fixed;left:0;top:0;padding:6px 10px;background:#111;color:#fafafa;font-size:12px;letter-spacing:.05em;border-radius:2px;pointer-events:none;opacity:0;z-index:96;transition:opacity .18s ease}
.fx-peek.on{opacity:.94}
@media (hover:none){.fx-peek{display:none}}

/* --- project pages: image mask reveal + panel focus --- */
.fx-mask{clip-path:inset(0 0 100% 0);opacity:.001;transition:clip-path .95s cubic-bezier(.16,.8,.24,1),opacity .7s ease}
.fx-mask.is-masked{clip-path:inset(0 0 0 0);opacity:1}
body.fx-focus .panel{opacity:.48;transition:opacity .28s ease}
body.fx-focus .panel:hover{opacity:1}

/* --- book pages: right-side reading rail + paragraph highlight --- */
.fx-readbar{position:fixed;right:14px;top:50%;transform:translateY(-50%);width:2px;height:32vh;background:rgba(128,128,128,.18);z-index:60;pointer-events:none}
.fx-readbar-fill{position:absolute;left:0;bottom:0;width:100%;height:0;background:var(--accent,#3f73ad)}
.fx-readbar-num{position:absolute;right:12px;bottom:-3px;font-size:10px;letter-spacing:.08em;color:var(--fg-muted,#8a8f98)}
@media (max-width:900px){.fx-readbar{display:none}}
.read-body p.fx-hover,.toc-row.fx-hover{background:rgba(63,115,173,.07)}

/* --- about: link underline draw --- */
body[data-page="about"] .ab-body a,.ab-links a{background-image:linear-gradient(currentColor,currentColor);background-repeat:no-repeat;background-position:0 100%;background-size:0 1px;transition:background-size .3s ease}
body[data-page="about"] .ab-body a:hover,.ab-links a:hover{background-size:100% 1px}

@media (prefers-reduced-motion: reduce){
  .fx-ring,.fx-peek{display:none}
  .pcard.fx-tilt,.ab-portrait.fx-tilt,.gprofile-img.fx-tilt{transition:none}
  .fx-mask{clip-path:none;opacity:1}
}


/* ---------- v19：去掉口号后的首页留白 ---------- */
.hero-side{justify-content:flex-start}
.hero-side .stats{margin-top:0}
.hero-foot{justify-content:flex-end}
@media (max-width:900px){
  .hero-grid{padding-bottom:clamp(28px,4vw,44px)}
}


/* v23 mobile header: keep nav labels on one line */
@media (max-width: 520px) {
  .head-in { gap: 8px; }
  .brand-name { display: none; }
  .nav { gap: 2px; flex: none; }
  .nav a { padding: 7px 6px; font-size: 12px; white-space: nowrap; }
  .nav .nav-mail { margin-left: 2px; padding: 7px 10px; }
  .theme { width: 32px; height: 32px; flex: none; }
}