/* ============================================================
   d96529 · personal site
   hand-written CSS, no frameworks, no external fonts
   ============================================================ */

/* ---------- tokens ---------- */
:root{
  --bg:#07070b;
  --bg-soft:#0b0b12;
  --panel:rgba(255,255,255,.035);
  --panel-hover:rgba(255,255,255,.06);
  --border:rgba(255,255,255,.08);
  --border-strong:rgba(255,255,255,.15);
  --text:#ecedf3;
  --muted:#9b9bab;
  --dim:#6e6e80;
  --accent:#8b7bff;
  --accent-2:#2dd4bf;
  --accent-3:#f472b6;
  --grad:linear-gradient(115deg,var(--accent) 0%,var(--accent-2) 100%);
  --shadow:0 18px 50px -18px rgba(0,0,0,.8);
  --radius:18px;
  --radius-sm:12px;
  --maxw:1100px;
  --nav-h:64px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;
  color-scheme:dark;
}

[data-theme="light"]{
  --bg:#f6f5f1;
  --bg-soft:#ffffff;
  --panel:rgba(20,18,30,.033);
  --panel-hover:rgba(20,18,30,.06);
  --border:rgba(20,18,30,.09);
  --border-strong:rgba(20,18,30,.18);
  --text:#15141b;
  --muted:#5d5c6b;
  --dim:#8a8998;
  --accent:#6d5bff;
  --accent-2:#0d9488;
  --accent-3:#db2777;
  --shadow:0 18px 50px -22px rgba(30,20,60,.25);
  color-scheme:light;
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--bg);color:var(--text);
  font-family:var(--font);font-size:15.5px;line-height:1.68;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
img,svg{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer;background:none;border:0;padding:0}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4,p,dl,dd,dt,ul,ol{margin:0;padding:0}
ul,ol{list-style:none}
::selection{background:rgba(139,123,255,.35);color:#fff}

.sprite{position:absolute;width:0;height:0;overflow:hidden}
.ico{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round;flex:none}
.dim{color:var(--dim)}
.muted-sm{color:var(--muted);font-size:13.5px;line-height:1.7}

.wrap{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:24px}

/* ---------- background ---------- */
.bg{position:fixed;inset:0;z-index:-2;overflow:hidden;pointer-events:none}
.blob{position:absolute;border-radius:50%;filter:blur(90px);opacity:.5;will-change:transform}
.blob-a{width:52vw;height:52vw;left:-14vw;top:-16vw;background:radial-gradient(circle at 30% 30%,#6d5bff,transparent 65%);animation:drift-a 26s ease-in-out infinite}
.blob-b{width:46vw;height:46vw;right:-12vw;top:6vh;background:radial-gradient(circle at 60% 40%,#0ea5a4,transparent 65%);opacity:.38;animation:drift-b 32s ease-in-out infinite}
.blob-c{width:40vw;height:40vw;left:26vw;bottom:-22vw;background:radial-gradient(circle at 50% 50%,#db2777,transparent 65%);opacity:.22;animation:drift-c 38s ease-in-out infinite}
[data-theme="light"] .blob{opacity:.13;filter:blur(110px)}

.grain{
  position:fixed;inset:0;z-index:-1;pointer-events:none;opacity:.035;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  mix-blend-mode:overlay;
}
[data-theme="light"] .grain{opacity:.05;mix-blend-mode:multiply}

.cursor-glow{
  position:fixed;left:0;top:0;width:460px;height:460px;border-radius:50%;
  pointer-events:none;z-index:0;opacity:0;transition:opacity .4s;
  background:radial-gradient(circle,rgba(139,123,255,.16),transparent 62%);
  transform:translate(-50%,-50%);
}
[data-theme="light"] .cursor-glow{background:radial-gradient(circle,rgba(109,91,255,.12),transparent 62%)}

.progress{position:fixed;top:0;left:0;height:2px;width:0;z-index:60;background:var(--grad);box-shadow:0 0 12px rgba(139,123,255,.6)}

@keyframes drift-a{0%,100%{transform:translate3d(0,0,0) scale(1)}50%{transform:translate3d(6vw,4vh,0) scale(1.08)}}
@keyframes drift-b{0%,100%{transform:translate3d(0,0,0) scale(1)}50%{transform:translate3d(-5vw,6vh,0) scale(1.1)}}
@keyframes drift-c{0%,100%{transform:translate3d(0,0,0) scale(1)}50%{transform:translate3d(4vw,-6vh,0) scale(1.06)}}

/* ---------- nav ---------- */
.nav{position:fixed;top:0;left:0;right:0;z-index:50;height:var(--nav-h);transition:background .3s,border-color .3s,backdrop-filter .3s;border-bottom:1px solid transparent}
.nav.is-stuck{background:color-mix(in srgb,var(--bg) 78%,transparent);backdrop-filter:blur(14px) saturate(160%);border-bottom-color:var(--border)}
.nav-inner{height:100%;display:flex;align-items:center;gap:18px}
.brand{display:flex;align-items:center;gap:10px;font-weight:600;letter-spacing:-.02em}
.brand-mark{
  display:grid;place-items:center;width:30px;height:30px;border-radius:9px;
  background:var(--grad);color:#08080d;font-family:var(--mono);font-size:12.5px;font-weight:700;letter-spacing:-.04em;
}
.brand-mark.small{width:24px;height:24px;border-radius:7px;font-size:10.5px}
.brand-text{font-size:15px}
.nav-links{display:flex;gap:4px;margin-left:auto}
.nav-links a{position:relative;padding:7px 12px;border-radius:9px;font-size:13.5px;color:var(--muted);transition:color .2s,background .2s}
.nav-links a:hover{color:var(--text);background:var(--panel)}
.nav-actions{display:flex;gap:8px;align-items:center}
.icon-btn{
  display:inline-flex;align-items:center;gap:7px;height:34px;padding:0 10px;border-radius:10px;
  border:1px solid var(--border);background:var(--panel);color:var(--muted);
  transition:color .2s,border-color .2s,background .2s;font-size:12.5px;
}
.icon-btn:hover{color:var(--text);border-color:var(--border-strong);background:var(--panel-hover)}
.icon-btn kbd{font-family:var(--mono);font-size:10.5px;color:var(--dim);border:1px solid var(--border);border-radius:5px;padding:1px 5px}
#themeBtn{padding:0;width:34px;justify-content:center}
.ico-sun{display:none}
[data-theme="light"] .ico-sun{display:block}
[data-theme="light"] .ico-moon{display:none}

/* ---------- hero ---------- */
.hero{min-height:calc(100vh - var(--nav-h));margin-top:var(--nav-h);display:flex;flex-direction:column;justify-content:center;padding-block:72px 48px;position:relative}
.eyebrow{display:inline-flex;align-items:center;gap:9px;font-family:var(--mono);font-size:11.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin-bottom:22px}
.eyebrow .dot{width:6px;height:6px;border-radius:50%;background:var(--accent-2);box-shadow:0 0 0 4px rgba(45,212,191,.14);animation:pulse 2.6s ease-in-out infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.35}}

.hero h1{font-size:clamp(2.5rem,7.2vw,4.8rem);line-height:1.04;letter-spacing:-.04em;font-weight:640;margin-bottom:14px}
.grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.typed-line{font-family:var(--mono);font-size:clamp(14px,2.1vw,17px);color:var(--muted);min-height:1.8em;margin-bottom:18px;display:flex;align-items:center}
.caret{display:inline-block;width:8px;height:1.05em;margin-left:2px;background:var(--accent-2);animation:blink 1.1s steps(1) infinite}
@keyframes blink{50%{opacity:0}}

.lead{max-width:620px;color:var(--muted);font-size:clamp(14.5px,1.5vw,16.5px);margin-bottom:34px}
.hero-cta{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:52px}
.btn{
  display:inline-flex;align-items:center;gap:9px;height:44px;padding:0 20px;border-radius:12px;
  font-size:14px;font-weight:550;letter-spacing:-.01em;transition:transform .18s,box-shadow .25s,border-color .2s,background .2s;
}
.btn:active{transform:translateY(1px) scale(.99)}
.btn-primary{background:var(--grad);color:#08080d;box-shadow:0 10px 30px -12px rgba(139,123,255,.8)}
.btn-primary:hover{box-shadow:0 14px 38px -12px rgba(139,123,255,.95);transform:translateY(-1px)}
.btn-ghost{border:1px solid var(--border);color:var(--text);background:var(--panel)}
.btn-ghost:hover{border-color:var(--border-strong);background:var(--panel-hover);transform:translateY(-1px)}
.btn-sm{height:34px;padding:0 12px;font-size:12.5px;border-radius:9px}

.hero-meta{display:flex;gap:36px;flex-wrap:wrap;margin:0}
.hero-meta div{display:flex;flex-direction:column;gap:2px}
.hero-meta dt{font-family:var(--mono);font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--dim)}
.hero-meta dd{font-size:15px;font-weight:550}

.scroll-hint{position:absolute;left:50%;bottom:18px;translate:-50% 0;width:22px;height:34px;border:1px solid var(--border-strong);border-radius:11px;display:grid;place-items:center}
.scroll-hint span{width:3px;height:7px;border-radius:2px;background:var(--muted);animation:wheel 1.8s ease-in-out infinite}
@keyframes wheel{0%{transform:translateY(-4px);opacity:0}40%{opacity:1}100%{transform:translateY(5px);opacity:0}}

/* ---------- sections ---------- */
.section{padding-block:96px;scroll-margin-top:calc(var(--nav-h) + 12px)}
.section-head{display:flex;align-items:center;gap:14px;margin-bottom:14px}
.section-head .idx{font-family:var(--mono);font-size:11.5px;color:var(--accent-2);letter-spacing:.1em}
.section-head h2{font-size:clamp(1.5rem,3vw,2rem);letter-spacing:-.03em;font-weight:620}
.section-head .rule{flex:1;height:1px;background:linear-gradient(90deg,var(--border),transparent)}
.section-sub{color:var(--muted);max-width:620px;margin-bottom:32px}

/* ---------- cards ---------- */
.bento{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
.card{
  position:relative;padding:24px;border-radius:var(--radius);
  background:var(--panel);border:1px solid var(--border);
  transition:border-color .25s,background .25s,transform .25s,box-shadow .3s;
  overflow:hidden;
}
.card::after{
  content:"";position:absolute;inset:0;border-radius:inherit;pointer-events:none;
  background:radial-gradient(600px circle at var(--mx,50%) var(--my,0%),rgba(139,123,255,.10),transparent 45%);
  opacity:0;transition:opacity .35s;
}
.card:hover{border-color:var(--border-strong);background:var(--panel-hover);transform:translateY(-2px);box-shadow:var(--shadow)}
.card:hover::after{opacity:1}
.card--wide{grid-column:span 2}
.card--tall{grid-row:span 2}
.card-title{font-size:15.5px;font-weight:600;letter-spacing:-.01em;margin-bottom:12px}
.card-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:12px}
.card-head .card-title{margin:0}
.card p{color:var(--muted);font-size:14px;margin-bottom:10px}
.card p:last-child{margin-bottom:0}
.card--wide.card--tall p{font-size:14.5px}

.tags{display:flex;flex-wrap:wrap;gap:6px}
.tags li{font-family:var(--mono);font-size:11.5px;color:var(--muted);border:1px solid var(--border);border-radius:6px;padding:3px 8px;background:var(--bg-soft)}

.stats{display:flex;gap:34px;flex-wrap:wrap;margin-top:6px}
.stat{display:flex;flex-direction:column}
.stat-num{font-size:clamp(1.6rem,3.4vw,2.2rem);font-weight:600;letter-spacing:-.03em;line-height:1.1;font-variant-numeric:tabular-nums}
.stat-label{font-size:12px;color:var(--dim);margin-top:2px}
.contact{display:flex;flex-direction:column;gap:8px;font-size:13.5px}
.contact a{display:inline-flex;align-items:center;gap:8px;color:var(--muted);transition:color .2s;word-break:break-all}
.contact a:hover{color:var(--text)}
.inline-link{color:var(--accent-2);border-bottom:1px solid color-mix(in srgb,var(--accent-2) 40%,transparent)}
.inline-link:hover{border-bottom-color:var(--accent-2)}

.principles{display:grid;gap:9px;margin-top:20px;padding-top:18px;border-top:1px solid var(--border)}
.principles li{display:grid;grid-template-columns:22px 1fr;gap:10px;font-size:13.5px;color:var(--muted);line-height:1.55}
.principles b{font-family:var(--mono);font-size:12px;color:var(--accent-2);font-weight:600;padding-top:1px}

/* ---------- tool & game cards ---------- */
.grid-cards{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}
.grid-cards--3{grid-template-columns:repeat(3,minmax(0,1fr))}

.tool-card{
  display:flex;flex-direction:column;align-items:flex-start;gap:4px;text-align:left;
  padding:20px 18px;border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--panel);
  transition:transform .22s,border-color .22s,background .22s,box-shadow .25s;
}
.tool-card:hover{transform:translateY(-3px);border-color:var(--border-strong);background:var(--panel-hover);box-shadow:var(--shadow)}
.tool-ico{
  display:grid;place-items:center;width:34px;height:34px;border-radius:9px;margin-bottom:10px;
  background:color-mix(in srgb,var(--accent) 16%,transparent);color:var(--accent);
  border:1px solid color-mix(in srgb,var(--accent) 26%,transparent);
}
.tool-name{font-size:14px;font-weight:560}
.tool-desc{font-size:12px;color:var(--dim)}

.game-card{
  display:flex;flex-direction:column;text-align:left;border-radius:var(--radius);border:1px solid var(--border);
  background:var(--panel);overflow:hidden;transition:transform .25s,border-color .25s,box-shadow .3s;
}
.game-card:hover{transform:translateY(-4px);border-color:var(--border-strong);box-shadow:var(--shadow)}
.game-visual{display:block;height:118px;position:relative;overflow:hidden;border-bottom:1px solid var(--border)}
.game-body{display:flex;flex-direction:column;gap:3px;padding:16px 18px 18px}
.game-name{font-size:15px;font-weight:600}
.game-desc{font-size:13px;color:var(--muted)}
.game-meta{font-family:var(--mono);font-size:10.5px;color:var(--dim);margin-top:6px;letter-spacing:.04em}

.visual-2048{display:grid;grid-template-columns:repeat(2,44px);grid-template-rows:repeat(2,44px);gap:6px;place-content:center;background:radial-gradient(circle at 50% 120%,rgba(139,123,255,.18),transparent 70%)}
.visual-2048 span{display:grid;place-items:center;border-radius:8px;font-family:var(--mono);font-size:13px;font-weight:600;color:#0a0a10;background:linear-gradient(150deg,#b9a8ff,#8b7bff)}
.visual-2048 span:nth-child(2){background:linear-gradient(150deg,#8ee7dc,#2dd4bf)}
.visual-2048 span:nth-child(3){background:linear-gradient(150deg,#f9a8d4,#f472b6)}
.visual-2048 span:nth-child(4){background:linear-gradient(150deg,#fcd34d,#f59e0b)}

.visual-snake{display:grid;grid-template-columns:repeat(6,14px);gap:5px;place-content:center;background:radial-gradient(circle at 50% 120%,rgba(45,212,191,.16),transparent 70%)}
.visual-snake i{width:14px;height:14px;border-radius:4px;background:color-mix(in srgb,var(--accent-2) 30%,transparent)}
.visual-snake i:nth-child(1){background:var(--accent-2)}
.visual-snake i:nth-child(5){background:var(--accent-3);border-radius:50%}

.visual-react{display:grid;place-items:center;background:radial-gradient(circle at 50% 120%,rgba(244,114,182,.14),transparent 70%)}
.visual-react i{width:46px;height:46px;border-radius:50%;background:var(--accent-3);box-shadow:0 0 0 10px color-mix(in srgb,var(--accent-3) 16%,transparent);animation:beat 1.6s ease-in-out infinite}
@keyframes beat{0%,100%{transform:scale(.82)}50%{transform:scale(1)}}

/* ---------- lab ---------- */
.lab-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:14px;align-items:start}
.badge{font-family:var(--mono);font-size:10px;letter-spacing:.08em;text-transform:uppercase;color:var(--accent-2);border:1px solid color-mix(in srgb,var(--accent-2) 30%,transparent);border-radius:6px;padding:2px 7px}

.keys{display:grid;grid-template-columns:repeat(8,1fr);gap:5px;margin:16px 0 18px;height:112px}
.key{
  position:relative;border-radius:8px;border:1px solid var(--border);
  background:linear-gradient(180deg,var(--panel-hover),var(--panel));
  display:flex;align-items:flex-end;justify-content:center;padding-bottom:8px;
  font-family:var(--mono);font-size:10.5px;color:var(--dim);
  transition:transform .08s,background .15s,border-color .15s,color .15s;
}
.key:hover{border-color:var(--border-strong);color:var(--muted)}
.key.is-down{transform:translateY(2px) scale(.97);background:var(--grad);border-color:transparent;color:#08080d}
.key.is-down span{color:#08080d}

.synth-bar{display:flex;align-items:center;gap:16px;flex-wrap:wrap;font-size:12.5px;color:var(--muted)}
.field-inline{display:inline-flex;align-items:center;gap:8px}
select,input[type="range"]{accent-color:var(--accent)}
select{background:var(--bg-soft);border:1px solid var(--border);border-radius:7px;padding:5px 8px;font-size:12.5px;color:var(--text)}
input[type="range"]{width:96px}

.kv{display:grid;gap:0;margin:4px 0 12px}
.kv > div{display:grid;grid-template-columns:84px 1fr;gap:12px;padding:8px 0;border-bottom:1px solid var(--border);font-size:13px}
.kv > div:last-child{border-bottom:0}
.kv dt{color:var(--dim);font-size:12px}
.kv dd{color:var(--text);word-break:break-word;font-family:var(--mono);font-size:12px}

/* ---------- home network ---------- */
.net-grid{display:grid;grid-template-columns:1.55fr 1fr;gap:14px;align-items:start}
.topo{width:100%;height:auto;margin:4px 0 14px;overflow:visible}
.topo-lane{font-family:var(--mono);font-size:10px;font-weight:600;letter-spacing:.16em;text-transform:uppercase;fill:var(--dim)}
.topo-t{font-family:var(--font);font-size:13px;font-weight:500;fill:var(--text)}
.topo-s{font-family:var(--mono);font-size:10.5px;fill:var(--muted)}
.topo-lbl{font-family:var(--mono);font-size:9.5px;letter-spacing:.06em;fill:var(--accent-2)}

.devices{display:grid;gap:0}
.devices li{display:grid;grid-template-columns:7px 108px 1fr;align-items:center;gap:10px;padding:9px 0;border-bottom:1px solid var(--border);font-size:13px}
.devices li:last-child{border-bottom:0}
.devices i{width:6px;height:6px;border-radius:50%;background:var(--accent-2);box-shadow:0 0 0 3px color-mix(in srgb,var(--accent-2) 16%,transparent)}
.devices b{font-weight:550}
.devices em{font-style:normal;color:var(--dim);font-size:11.5px;font-family:var(--mono)}

.net-rules{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:14px}
.net-rules > div{padding:16px 18px;border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--panel)}
.net-rules b{display:block;font-size:13px;margin-bottom:6px}
.net-rules span{font-size:12.5px;color:var(--muted);line-height:1.6}

/* ---------- terminal ---------- */
.term{border-radius:var(--radius);border:1px solid var(--border);background:color-mix(in srgb,var(--bg-soft) 92%,transparent);overflow:hidden;box-shadow:var(--shadow)}
.term-bar{display:flex;align-items:center;gap:12px;padding:11px 16px;border-bottom:1px solid var(--border);background:var(--panel)}
.term-dots{display:flex;gap:6px}
.term-dots i{width:10px;height:10px;border-radius:50%;background:color-mix(in srgb,var(--text) 18%,transparent)}
.term-dots i:nth-child(1){background:#ff5f57}
.term-dots i:nth-child(2){background:#febc2e}
.term-dots i:nth-child(3){background:#28c840}
.term-title{font-family:var(--mono);font-size:11.5px;color:var(--dim)}
.term-out{font-family:var(--mono);font-size:12.8px;line-height:1.66;padding:18px 18px 6px;max-height:420px;overflow-y:auto;color:var(--muted);white-space:pre-wrap;word-break:break-word}
.term-out::-webkit-scrollbar{width:8px}
.term-out::-webkit-scrollbar-thumb{background:var(--border-strong);border-radius:4px}
.term-line{min-height:1.66em}
.term-line .ok{color:var(--accent-2)}
.term-line .warn{color:#f59e0b}
.term-line .err{color:#f87171}
.term-line .hl{color:var(--text)}
.term-input-row{display:flex;align-items:center;gap:8px;padding:10px 18px 16px;font-family:var(--mono);font-size:12.8px}
.prompt{color:var(--accent-2);white-space:nowrap}
.term-input{flex:1;background:none;border:0;outline:none;font-family:var(--mono);font-size:12.8px;color:var(--text);caret-color:var(--accent-2)}

/* ---------- footer ---------- */
.footer{border-top:1px solid var(--border);margin-top:40px;padding-block:28px}
.footer-inner{display:flex;align-items:center;gap:16px;flex-wrap:wrap;font-size:12.5px;color:var(--muted)}
.footer-left{display:flex;align-items:center;gap:9px}
.footer-mid{margin-inline:auto;text-align:center}
.footer-right a{border-bottom:1px solid transparent;transition:border-color .2s,color .2s}
.footer-right a:hover{color:var(--text);border-bottom-color:var(--border-strong)}

/* ---------- overlay / panel ---------- */
.overlay{
  position:fixed;inset:0;z-index:80;display:grid;place-items:center;padding:24px;
  background:rgba(4,4,8,.72);backdrop-filter:blur(8px);
  opacity:0;transition:opacity .2s;
}
.overlay[hidden]{display:none}
.overlay.is-open{opacity:1}
.panel{
  width:100%;max-width:720px;max-height:calc(100vh - 48px);display:flex;flex-direction:column;
  background:var(--bg-soft);border:1px solid var(--border-strong);border-radius:var(--radius);
  box-shadow:0 40px 90px -30px rgba(0,0,0,.9);
  transform:translateY(10px) scale(.985);opacity:0;transition:transform .24s cubic-bezier(.2,.7,.2,1),opacity .2s;
}
.overlay.is-open .panel{transform:none;opacity:1}
.panel-head{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:18px 20px;border-bottom:1px solid var(--border)}
.panel-title{font-size:15px;font-weight:600}
.panel-head .icon-btn{height:30px;width:30px;padding:0;justify-content:center}
.panel-body{padding:20px;overflow-y:auto}
.panel-body::-webkit-scrollbar{width:8px}
.panel-body::-webkit-scrollbar-thumb{background:var(--border-strong);border-radius:4px}

/* tool UI inside panel */
.tool-ui{display:flex;flex-direction:column;gap:12px}
.tool-ui label{font-size:12px;color:var(--dim);font-family:var(--mono);letter-spacing:.04em;text-transform:uppercase}
.tool-row{display:flex;gap:10px;flex-wrap:wrap}
.tool-row > *{flex:1;min-width:150px}
/* 只作用于面板内的表单，避免污染终端输入框和命令面板 */
.panel-body textarea,
.panel-body input[type="text"],
.panel-body input[type="number"]{
  width:100%;background:var(--bg);border:1px solid var(--border);border-radius:10px;
  padding:11px 13px;font-family:var(--mono);font-size:12.8px;line-height:1.6;outline:none;resize:vertical;
  transition:border-color .2s;
}
.panel-body textarea:focus,
.panel-body input[type="text"]:focus,
.panel-body input[type="number"]:focus{border-color:color-mix(in srgb,var(--accent) 55%,transparent)}
.panel-body textarea{min-height:130px}
.out-box{background:var(--bg);border:1px solid var(--border);border-radius:10px;padding:11px 13px;font-family:var(--mono);font-size:12.8px;line-height:1.65;white-space:pre-wrap;word-break:break-all;max-height:240px;overflow:auto;color:var(--muted)}
.hint{font-size:12px;color:var(--dim)}
.err-text{color:#f87171;font-size:12.5px;font-family:var(--mono)}
.swatch{width:44px;height:44px;border-radius:10px;border:1px solid var(--border-strong);flex:none!important}

/* games */
.game-shell{display:flex;flex-direction:column;align-items:center;gap:14px}
.game-top{display:flex;align-items:center;gap:18px;width:100%;justify-content:center;font-family:var(--mono);font-size:12px;color:var(--muted)}
.game-top b{color:var(--text);font-weight:600}
.board2048{
  position:relative;width:min(340px,80vw);aspect-ratio:1;border-radius:14px;
  background:color-mix(in srgb,var(--bg) 70%,transparent);border:1px solid var(--border);padding:10px;
  touch-action:none;
}
.board2048 .cellgrid{position:absolute;inset:10px;display:grid;grid-template-columns:repeat(4,1fr);grid-template-rows:repeat(4,1fr);gap:8px}
.board2048 .cellgrid i{background:var(--panel);border-radius:8px}
.tile-layer{position:absolute;inset:10px}
.tile{
  position:absolute;width:25%;height:25%;padding:5px;
  transition:transform .13s cubic-bezier(.3,.8,.4,1);
  will-change:transform;
}
.tile span{
  display:grid;place-items:center;width:100%;height:100%;border-radius:8px;
  font-family:var(--mono);font-weight:700;font-size:clamp(15px,4.4vw,22px);
  background:var(--panel-hover);color:var(--text);
}
.tile.new span{animation:pop .15s ease-out}
.tile.merged span{animation:merge .18s ease-out}
@keyframes pop{from{transform:scale(.6);opacity:.4}to{transform:scale(1);opacity:1}}
@keyframes merge{0%{transform:scale(1)}45%{transform:scale(1.16)}100%{transform:scale(1)}}

.v2 span{background:linear-gradient(150deg,#cfc6ff,#b9a8ff);color:#0a0a10}
.v4 span{background:linear-gradient(150deg,#b9a8ff,#8b7bff);color:#0a0a10}
.v8 span{background:linear-gradient(150deg,#8ee7dc,#2dd4bf);color:#062a26}
.v16 span{background:linear-gradient(150deg,#5eead4,#14b8a6);color:#052e2a}
.v32 span{background:linear-gradient(150deg,#f9a8d4,#f472b6);color:#3b0a22}
.v64 span{background:linear-gradient(150deg,#f472b6,#db2777);color:#fff}
.v128 span{background:linear-gradient(150deg,#fcd34d,#f59e0b);color:#2c1a00;font-size:clamp(13px,3.8vw,19px)}
.v256 span{background:linear-gradient(150deg,#fbbf24,#d97706);color:#2c1a00;font-size:clamp(13px,3.8vw,19px)}
.v512 span{background:linear-gradient(150deg,#fb7185,#e11d48);color:#fff;font-size:clamp(13px,3.8vw,19px)}
.v1024 span{background:linear-gradient(150deg,#a78bfa,#7c3aed);color:#fff;font-size:clamp(11px,3.2vw,16px)}
.v2048 span{background:linear-gradient(150deg,#22d3ee,#0891b2);color:#fff;font-size:clamp(11px,3.2vw,16px);box-shadow:0 0 26px rgba(34,211,238,.6)}
.vbig span{background:linear-gradient(150deg,#f43f5e,#9f1239);color:#fff;font-size:clamp(10px,2.8vw,14px)}

canvas.game-canvas{width:min(380px,84vw);aspect-ratio:1;border-radius:14px;border:1px solid var(--border);background:color-mix(in srgb,var(--bg) 80%,transparent);touch-action:none}
.react-area{
  width:min(420px,86vw);height:min(320px,54vh);border-radius:14px;display:grid;place-items:center;
  border:1px solid var(--border);background:var(--panel);cursor:pointer;user-select:none;
  font-size:15px;color:var(--muted);transition:background .12s,color .12s;
}
.react-area.ready{background:linear-gradient(150deg,#34d399,#059669);color:#04120d;font-weight:600;font-size:20px}
.react-area.early{background:linear-gradient(150deg,#f87171,#dc2626);color:#fff}
.react-area .big{font-family:var(--mono);font-size:36px;font-weight:700}
.game-actions{display:flex;gap:8px;flex-wrap:wrap;justify-content:center}

/* palette */
.palette{position:fixed;inset:0;z-index:90;display:grid;align-items:start;justify-items:center;padding:12vh 20px 20px;background:rgba(4,4,8,.6);backdrop-filter:blur(6px)}
.palette[hidden]{display:none}
.palette-box{width:100%;max-width:560px;background:var(--bg-soft);border:1px solid var(--border-strong);border-radius:16px;box-shadow:0 40px 90px -30px rgba(0,0,0,.9);overflow:hidden}
.palette-input{width:100%;border:0;border-bottom:1px solid var(--border);background:none;padding:16px 18px;font-size:14px;outline:none}
.palette-list{max-height:46vh;overflow-y:auto;padding:6px}
.palette-item{display:flex;align-items:center;gap:10px;padding:9px 12px;border-radius:9px;font-size:13.5px;color:var(--muted);cursor:pointer}
.palette-item[aria-selected="true"]{background:var(--panel-hover);color:var(--text)}
.palette-item .k{margin-left:auto;font-family:var(--mono);font-size:10.5px;color:var(--dim)}
.palette-foot{display:flex;gap:8px;align-items:center;padding:9px 14px;border-top:1px solid var(--border);font-size:11px;color:var(--dim)}
.palette-foot kbd{font-family:var(--mono);font-size:10px;border:1px solid var(--border);border-radius:4px;padding:0 4px}

/* toast */
.toast{
  position:fixed;left:50%;bottom:28px;translate:-50% 12px;z-index:100;
  background:var(--text);color:var(--bg);padding:9px 16px;border-radius:10px;font-size:12.5px;font-weight:550;
  opacity:0;pointer-events:none;transition:opacity .2s,translate .2s;box-shadow:var(--shadow);
}
.toast.is-on{opacity:1;translate:-50% 0}

.noscript{position:fixed;left:0;right:0;bottom:0;background:#f59e0b;color:#1a1200;padding:10px 20px;font-size:13px;text-align:center;z-index:200}

/* ---------- reveal ---------- */
.js .reveal{opacity:0;transform:translateY(16px);transition:opacity .7s cubic-bezier(.2,.7,.2,1),transform .7s cubic-bezier(.2,.7,.2,1)}
.js .reveal.in{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media (max-width:960px){
  .nav-links{display:none}
  .grid-cards{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid-cards--3{grid-template-columns:1fr}
  .lab-grid{grid-template-columns:1fr}
  .net-grid{grid-template-columns:1fr}
  .net-rules{grid-template-columns:1fr}
  .bento{grid-template-columns:1fr}
  .card--wide,.card--tall{grid-column:auto;grid-row:auto}
  .br-d{display:none}
  .hero-meta{gap:26px}
  .hero-cta{margin-bottom:36px}
  .footer-mid{margin-inline:0;order:3;width:100%;text-align:left}
}
@media (max-width:560px){
  .wrap{padding-inline:18px}
  .section{padding-block:68px}
  .hero{padding-block:40px 32px}
  .stats{gap:22px}
  .synth-bar{gap:10px}
  .keys{height:92px}
  .palette-foot{display:none}
  .icon-btn kbd{display:none}
  .game-visual{height:96px}
}
@media (hover:none){
  .cursor-glow{display:none}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important;scroll-behavior:auto!important}
  .js .reveal{opacity:1;transform:none}
}