:root{--bg:#f6f7fb;--bg2:#fff;--ink:#12141f;--mut:#5b6178;--line:#e3e6f0;--acc:#6366f1;--acc2:#06b6d4;--ok:#16a34a;--bad:#dc2626;--warn:#d97706;--shadow:0 8px 30px rgba(30,40,90,.10);--r:16px}
:root[data-theme=dark]{--bg:#0b0d17;--bg2:#141829;--ink:#eef0fa;--mut:#9aa2c0;--line:#252a42;--shadow:0 8px 30px rgba(0,0,0,.45)}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]){--bg:#0b0d17;--bg2:#141829;--ink:#eef0fa;--mut:#9aa2c0;--line:#252a42;--shadow:0 8px 30px rgba(0,0,0,.45)}}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.55 Inter,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;min-height:100vh;display:flex;flex-direction:column}
a{color:var(--acc);text-decoration:none}a:hover{text-decoration:underline}
h1,h2,h3{line-height:1.2;margin:0 0 .5em}h1{font-size:clamp(2rem,5vw,3.2rem)}h2{font-size:1.6rem}
main{flex:1;outline:none}.wrap{max-width:1180px;margin:0 auto;padding:24px 20px}
.top{position:sticky;top:0;z-index:50;display:flex;gap:14px;align-items:center;padding:10px 20px;background:color-mix(in srgb,var(--bg) 82%,transparent);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.brand{font-weight:800;color:var(--ink);display:flex;align-items:center;gap:8px;white-space:nowrap}.brand:hover{text-decoration:none}
.logo{display:inline-grid;place-items:center;width:30px;height:30px;border-radius:9px;background:linear-gradient(135deg,var(--acc),var(--acc2));color:#fff;font:700 14px monospace}
nav{display:flex;gap:4px;margin-left:8px}nav a{color:var(--mut);padding:6px 11px;border-radius:9px;font-weight:600;font-size:.92rem}nav a:hover,nav a.on{background:var(--bg2);color:var(--ink);text-decoration:none;box-shadow:0 0 0 1px var(--line)}
.search{position:relative;margin-left:auto;width:min(340px,34vw)}
.search input{width:100%;padding:9px 14px;border-radius:12px;border:1px solid var(--line);background:var(--bg2);color:var(--ink);font:inherit;font-size:.92rem}
.search input:focus{outline:2px solid var(--acc);border-color:transparent}
.suggest{position:absolute;top:calc(100% + 6px);left:0;right:0;min-width:320px;background:var(--bg2);border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow);overflow:hidden;max-height:70vh;overflow-y:auto}
.suggest a{display:block;padding:9px 14px;color:var(--ink);border-bottom:1px solid var(--line)}.suggest a small{display:block;color:var(--mut)}
.suggest a.sel,.suggest a:hover{background:color-mix(in srgb,var(--acc) 12%,transparent);text-decoration:none}
.grp{position:relative}.gb{background:none;border:0;font:inherit;color:var(--mut);padding:6px 11px;border-radius:9px;font-weight:600;font-size:.92rem;cursor:pointer}.grp:hover .gb,.grp:focus-within .gb,.grp.on .gb{background:var(--bg2);color:var(--ink);box-shadow:0 0 0 1px var(--line)}
.menu{display:none;position:absolute;top:100%;left:0;min-width:150px;padding:6px;background:var(--bg2);border:1px solid var(--line);border-radius:12px;box-shadow:0 8px 24px #0003;z-index:20;flex-direction:column}.grp:hover .menu,.grp:focus-within .menu{display:flex}.menu a{white-space:nowrap}
.icon-btn{border:1px solid var(--line);background:var(--bg2);color:var(--ink);border-radius:10px;width:36px;height:36px;cursor:pointer;font-size:1rem}.burger{display:none}
.foot{text-align:center;color:var(--mut);padding:30px 20px;font-size:.85rem}
.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 18px;border-radius:12px;border:1px solid var(--line);background:var(--bg2);color:var(--ink);font:600 .95rem inherit;font-family:inherit;cursor:pointer;transition:.15s}
.btn:hover{transform:translateY(-1px);text-decoration:none;box-shadow:var(--shadow)}
.btn.pri{background:linear-gradient(135deg,var(--acc),#8b5cf6);color:#fff;border:0}.btn.sm{padding:6px 12px;font-size:.85rem}.btn:disabled{opacity:.5;cursor:not-allowed;transform:none}
.card{background:var(--bg2);border:1px solid var(--line);border-radius:var(--r);padding:20px;box-shadow:var(--shadow)}
.grid{display:grid;gap:16px;grid-template-columns:repeat(auto-fill,minmax(250px,1fr))}
.chip{display:inline-block;padding:2px 10px;border-radius:99px;font-size:.75rem;font-weight:700;background:var(--bg);border:1px solid var(--line);color:var(--mut)}
.chip.b{color:#16a34a}.chip.i{color:#d97706}.chip.a{color:#dc2626}
.muted{color:var(--mut)}.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.sp{flex:1}
/* hero */
.hero{position:relative;overflow:hidden;color:#fff;background:#0b0d17;min-height:520px}
.hero canvas.bg{position:absolute;inset:0;width:100%;height:100%}
.slides{position:relative;max-width:1180px;margin:0 auto;height:520px}
.slide{position:absolute;inset:0;display:grid;grid-template-columns:1.1fr 1fr;gap:30px;align-items:center;padding:30px 24px 60px;opacity:0;transform:translateX(40px);transition:.6s;pointer-events:none}
.slide.on{opacity:1;transform:none;pointer-events:auto}.slide.out{transform:translateX(-40px)}
.slide h1{background:linear-gradient(90deg,#fff,#a5b4fc,#67e8f9);-webkit-background-clip:text;background-clip:text;color:transparent}
.slide p{color:#c3c9e6;font-size:1.1rem;max-width:520px}.slide .btn{border-color:#ffffff33;background:#ffffff14;color:#fff}.slide .btn.pri{background:linear-gradient(135deg,#6366f1,#06b6d4)}
.hero-vis{display:grid;place-items:center;min-height:300px}
.hnav{position:absolute;bottom:18px;left:0;right:0;display:flex;justify-content:center;gap:10px;align-items:center;z-index:3}
.dot{width:34px;height:5px;border-radius:9px;background:#ffffff33;border:0;padding:0;cursor:pointer;overflow:hidden;position:relative}
.dot.on::after{content:"";position:absolute;inset:0;background:#fff;transform-origin:left;animation:fill var(--dur,6s) linear forwards}
.hero.paused .dot.on::after{animation-play-state:paused}
@keyframes fill{from{transform:scaleX(0)}to{transform:scaleX(1)}}
.arrow{position:absolute;top:50%;z-index:3;background:#ffffff18;color:#fff;border:1px solid #ffffff30;width:42px;height:42px;border-radius:50%;cursor:pointer;font-size:1.2rem}.arrow.l{left:12px}.arrow.r{right:12px}
.bigstat{display:flex;gap:28px;margin-top:22px;flex-wrap:wrap}.bigstat b{display:block;font-size:2rem;color:#fff}.bigstat span{color:#9aa6d6;font-size:.85rem}
.mini-bars{display:flex;align-items:flex-end;gap:8px;height:230px}.mini-bars i{width:22px;border-radius:6px 6px 0 0;background:linear-gradient(#67e8f9,#6366f1);animation:bob 2.4s ease-in-out infinite}
@keyframes bob{50%{transform:scaleY(.45)}}.mini-bars i{transform-origin:bottom}
.glass{background:#ffffff12;border:1px solid #ffffff26;border-radius:18px;padding:22px;backdrop-filter:blur(10px);color:#fff;width:min(380px,100%)}
.glass .opt{padding:10px 14px;border:1px solid #ffffff2a;border-radius:11px;margin:8px 0;animation:pulse 4s infinite}.glass .opt:nth-child(3){background:#16a34a55;border-color:#4ade80}
@keyframes pulse{50%{background:#ffffff1c}}
.orbit{position:relative;width:260px;height:260px}.orbit span{position:absolute;inset:0;border:1px dashed #ffffff44;border-radius:50%;animation:spin 14s linear infinite}.orbit span:nth-child(2){inset:35px;animation-duration:9s;animation-direction:reverse}.orbit span:nth-child(3){inset:70px;animation-duration:6s}
.orbit span::after{content:"";position:absolute;top:-6px;left:50%;width:12px;height:12px;border-radius:50%;background:#67e8f9;box-shadow:0 0 14px #67e8f9}
.orbit b{position:absolute;inset:0;display:grid;place-items:center;font-size:2.4rem}@keyframes spin{to{transform:rotate(360deg)}}
.fakesearch{background:#fff;color:#12141f;border-radius:14px;padding:14px;width:min(380px,100%);font-family:monospace}.fakesearch div{padding:7px 4px;border-top:1px solid #eee;opacity:0;animation:rise .6s forwards}.fakesearch div:nth-child(2){animation-delay:.3s}.fakesearch div:nth-child(3){animation-delay:.6s}.fakesearch div:nth-child(4){animation-delay:.9s}.fakesearch div:nth-child(5){animation-delay:1.2s}
@keyframes rise{from{transform:translateY(10px)}to{opacity:1;transform:none}}
.caret{border-right:2px solid #6366f1;animation:blink 1s steps(1) infinite}@keyframes blink{50%{border-color:transparent}}
/* areas */
.area{display:block;color:var(--ink);position:relative;overflow:hidden;transition:.2s}.area:hover{transform:translateY(-4px);text-decoration:none}
.area::before{content:"";position:absolute;inset:0 0 auto 0;height:4px;background:var(--c)}
.area .ic{font-size:1.8rem}.bar{height:6px;border-radius:9px;background:var(--line);overflow:hidden}.bar i{display:block;height:100%;background:var(--c,var(--acc));transition:width .6s}
.tabs{display:flex;gap:8px;margin:14px 0;flex-wrap:wrap}.tab{padding:7px 14px;border-radius:99px;border:1px solid var(--line);background:var(--bg2);color:var(--ink);cursor:pointer;font:600 .9rem inherit;font-family:inherit}.tab.on{background:var(--acc);color:#fff;border-color:var(--acc)}
.tlist{display:grid;gap:8px;grid-template-columns:repeat(auto-fill,minmax(300px,1fr))}
.trow{display:flex;gap:10px;align-items:flex-start;padding:11px 14px;border:1px solid var(--line);border-radius:12px;background:var(--bg2);color:var(--ink)}.trow:hover{border-color:var(--acc);text-decoration:none;transform:translateX(3px)}.trow small{color:var(--mut);display:block}.trow .ck{color:var(--ok);font-weight:800}
.section-h{display:flex;align-items:end;justify-content:space-between;margin:34px 0 14px;gap:10px}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:14px}.stat{text-align:center}.stat b{font-size:2rem;display:block;background:linear-gradient(90deg,var(--acc),var(--acc2));-webkit-background-clip:text;background-clip:text;color:transparent}
/* topic */
.crumbs{font-size:.88rem;color:var(--mut);margin-bottom:8px}.two{display:grid;grid-template-columns:2fr 1fr;gap:20px}
.lead{font-size:1.2rem}.qa{border:1px solid var(--line);border-radius:12px;margin:8px 0;background:var(--bg2)}.qa summary{padding:12px 16px;cursor:pointer;font-weight:600}.qa div{padding:0 16px 14px;color:var(--mut)}
.vizbox{background:var(--bg2);border:1px solid var(--line);border-radius:var(--r);padding:16px}
.viz-ctl{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin-bottom:12px}.viz-ctl select,.viz-ctl input[type=text],.viz-ctl input[type=number]{padding:7px 10px;border-radius:9px;border:1px solid var(--line);background:var(--bg);color:var(--ink);font:inherit;max-width:140px}
.viz-note{color:var(--mut);font-size:.9rem;min-height:1.4em;margin-top:8px}
.stage{display:flex;align-items:flex-end;gap:3px;height:260px;padding:6px;background:var(--bg);border-radius:12px}.stage i{flex:1;background:var(--acc);border-radius:4px 4px 0 0;transition:height .12s}
.stage i.cmp{background:#f59e0b}.stage i.swp{background:#ef4444}.stage i.ok{background:#22c55e}.stage i.pv{background:#a855f7}
.cells{display:flex;gap:6px;flex-wrap:wrap;margin:10px 0}.cell{min-width:46px;padding:10px 6px;text-align:center;border:2px solid var(--line);border-radius:10px;background:var(--bg);font:600 .95rem monospace;transition:.2s}
.cell.hi{border-color:#f59e0b;background:#f59e0b22}.cell.fnd{border-color:#22c55e;background:#22c55e22}.cell.dim{opacity:.3}.cell.new{animation:pop .4s}@keyframes pop{from{transform:scale(.3);opacity:0}}
svg.vz{width:100%;height:auto;background:var(--bg);border-radius:12px}svg.vz text{fill:var(--ink);font:600 13px monospace;text-anchor:middle;dominant-baseline:central}
svg.vz .n circle{fill:var(--bg2);stroke:var(--acc);stroke-width:2.5;transition:.25s}svg.vz .n.vis circle{fill:#22c55e55;stroke:#22c55e}svg.vz .n.cur circle{fill:#f59e0b66;stroke:#f59e0b}svg.vz line,svg.vz .e{stroke:var(--line);stroke-width:2.5;transition:.25s}svg.vz .e.hot{stroke:#22c55e}
canvas.chart{width:100%;height:300px;display:block}
.bits{display:flex;gap:6px;flex-wrap:wrap}.bit{width:46px;padding:10px 0;text-align:center;border-radius:10px;border:2px solid var(--acc);font:700 1.2rem monospace;cursor:pointer;user-select:none;background:var(--bg)}.bit.on{background:var(--acc);color:#fff}.bit small{display:block;font-size:.65rem;opacity:.7}
.gate{display:flex;gap:12px;align-items:center;flex-wrap:wrap}.led{width:26px;height:26px;border-radius:50%;background:#555;display:inline-block;transition:.2s}.led.on{background:#22c55e;box-shadow:0 0 14px #22c55e}
table.dp{border-collapse:collapse;font:600 .85rem monospace}.dp td,.dp th{border:1px solid var(--line);padding:6px 9px;text-align:center;transition:.2s}.dp td.cur{background:#f59e0b55}.dp td.done{background:#22c55e22}
/* quiz */
.qcard{max-width:760px;margin:0 auto}.qopt{display:block;width:100%;text-align:left;margin:9px 0;padding:13px 16px;border-radius:12px;border:2px solid var(--line);background:var(--bg2);color:var(--ink);font:inherit;cursor:pointer;transition:.12s}
.qopt:hover:not(:disabled){border-color:var(--acc)}.qopt.ok{border-color:var(--ok);background:#16a34a22}.qopt.bad{border-color:var(--bad);background:#dc262622}.qopt.sel{border-color:var(--acc);background:#6366f122}
.prog{height:8px;background:var(--line);border-radius:9px;overflow:hidden;margin:14px 0}.prog i{display:block;height:100%;background:linear-gradient(90deg,var(--acc),var(--acc2));transition:width .3s}
.form{display:grid;gap:14px;max-width:560px}.form label{display:grid;gap:5px;font-weight:600}.form select{padding:10px;border-radius:10px;border:1px solid var(--line);background:var(--bg2);color:var(--ink);font:inherit}
.score{font-size:3.4rem;font-weight:800;text-align:center;background:linear-gradient(90deg,var(--acc),var(--acc2));-webkit-background-clip:text;background-clip:text;color:transparent}
.timer{font:700 1.1rem monospace;color:var(--warn)}
mark{background:#fde04755;color:inherit;border-radius:3px}
.pgn{display:flex;gap:8px;justify-content:center;margin:20px 0}
@media(max-width:860px){nav{display:none;position:absolute;top:100%;left:0;right:0;flex-direction:column;background:var(--bg2);padding:10px;border-bottom:1px solid var(--line)}nav.open{display:flex}.gb{display:block;width:100%;text-align:left;cursor:default}.menu{display:flex;position:static;box-shadow:none;border:0;padding:0 0 4px 12px;background:none}.burger{display:block}.search{width:auto;flex:1}.slide{grid-template-columns:1fr;padding-top:20px}.hero-vis{display:none}.slides{height:480px}.hero{min-height:480px}.two{grid-template-columns:1fr}.arrow{display:none}}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}

.detail{display:grid;gap:12px;margin-top:22px}.detail section{background:var(--bg2);border:1px solid var(--line);border-left:4px solid var(--acc);border-radius:12px;padding:4px 18px 12px}
.detail section.warn{border-left-color:var(--warn)}.detail h3{font-size:1rem;margin:12px 0 4px}.detail p{margin:0;color:var(--ink)}