@font-face{font-family:"Bitter";src:url(/assets/fonts/bitter-latin-600-normal.woff2) format("woff2");font-weight:600;font-display:swap}
@font-face{font-family:"Bitter";src:url(/assets/fonts/bitter-latin-800-normal.woff2) format("woff2");font-weight:800;font-display:swap}
@font-face{font-family:"Rethink Sans";src:url(/assets/fonts/rethink-sans-latin-400-normal.woff2) format("woff2");font-weight:400;font-display:swap}
@font-face{font-family:"Rethink Sans";src:url(/assets/fonts/rethink-sans-latin-600-normal.woff2) format("woff2");font-weight:600;font-display:swap}
@font-face{font-family:"Rethink Sans";src:url(/assets/fonts/rethink-sans-latin-700-normal.woff2) format("woff2");font-weight:700;font-display:swap}

:root{
  --bg:#faf7f0;--card:#ffffff;--ink:#102a33;--soft:#4a5d63;--rule:#dfd8c8;--tint:#e9f1ef;
  --teal:#0e5e66;--teal-ink:#f4fbfa;--coral:#e2603c;--coral-ink:#b23f1f;--link:#0b6670;
  --warn-bg:#fff2d6;--warn:#7a4b00;--bad-bg:#fde4dc;--bad:#a02c10;
  --serif:"Bitter",Georgia,"Times New Roman",serif;
  --sans:"Rethink Sans",system-ui,-apple-system,"Segoe UI",sans-serif;
}
@media (prefers-color-scheme:dark){:root{
  --bg:#0b1d22;--card:#11282e;--ink:#e6efed;--soft:#a6b8b8;--rule:#24414a;--tint:#14323a;
  --teal:#0d4d55;--coral:#f07a55;--coral-ink:#ff9a78;--link:#7fd3d6;
  --warn-bg:#3a2e12;--warn:#ffd88a;--bad-bg:#40201a;--bad:#ffb4a0;
}}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:400 1.0625rem/1.65 var(--sans);overflow-x:hidden}
a{color:var(--link);text-underline-offset:.2em}
:focus-visible{outline:3px solid var(--coral);outline-offset:2px}
.skip{position:absolute;left:-9999px}
.skip:focus{left:12px;top:12px;z-index:9;background:var(--card);color:var(--ink);padding:8px 12px}
main:focus{outline:none}
h1,h2,h3{font-family:var(--serif);line-height:1.2;margin:0}
button{font:inherit}

/* header band */
.band{background:var(--teal);color:var(--teal-ink)}
.band-in{max-width:1200px;margin:0 auto;padding:0 20px;display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:64px}
.brand{display:inline-flex;align-items:center;gap:9px;color:inherit;text-decoration:none;font:800 1.3rem/1 var(--serif);margin:0}
.brand em{font-style:normal;color:#ffc9b5}
.tabs{display:flex;gap:2px;align-self:stretch}
.tabs a{display:flex;align-items:center;padding:0 14px;color:var(--teal-ink);text-decoration:none;font-weight:600;font-size:.95rem;border-bottom:4px solid transparent}
.tabs a:hover{background:rgba(255,255,255,.08)}
.tabs a[aria-current]{border-bottom-color:var(--coral)}
.tabs a:focus-visible{outline-color:#fff;outline-offset:-3px}

/* hero */
.hero{background:var(--teal);color:var(--teal-ink);padding:26px 0 90px}
.hero-in{max-width:1200px;margin:0 auto;padding:0 20px}
.hero h1{font-size:clamp(2rem,4.4vw,3.2rem);font-weight:800;max-width:16ch}
.hero p{max-width:62ch;margin:14px 0 0;color:#d4e8e6;font-size:1.08rem}

/* engine */
.engine{max-width:1200px;margin:-64px auto 0;padding:0 20px;display:grid;grid-template-columns:minmax(0,5fr) minmax(0,6fr);gap:20px;align-items:start}
.source,.thread{background:var(--card);border:1px solid var(--rule);border-radius:16px;padding:20px;box-shadow:0 10px 30px rgba(16,42,51,.08);min-width:0}
.source{position:relative}
.label{font:700 .8rem/1.2 var(--sans);text-transform:uppercase;letter-spacing:.08em;color:var(--soft)}
#src{display:block;width:100%;margin-top:10px;min-height:280px;resize:vertical;border:1px solid var(--rule);border-radius:10px;padding:12px 14px;background:var(--bg);color:var(--ink);font:400 1rem/1.6 var(--sans)}
#src:focus,.ptext:focus{outline:3px solid var(--coral);outline-offset:1px}
.src-meta{margin:6px 0 0;font-size:.85rem;color:var(--soft)}
.opts{border:0;padding:0;margin:16px 0 0;display:flex;flex-wrap:wrap;gap:8px}
.opts legend{font-weight:700;font-size:.92rem;margin-bottom:6px;padding:0}
.opts label{display:inline-flex;align-items:center;gap:6px;padding:7px 12px;border:1px solid var(--rule);border-radius:999px;cursor:pointer;font-size:.92rem;background:var(--bg)}
.opts label:has(input:checked){border-color:var(--teal);background:var(--tint);font-weight:600}
.opts input[type=radio]{accent-color:var(--teal);margin:0}
.opts input[type=number]{width:4.2em;padding:3px 6px;border:1px solid var(--rule);border-radius:6px;background:var(--card);color:var(--ink);font:inherit}
.src-tools{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.src-note{font-size:.84rem;color:var(--soft);margin:12px 0 0}
.button{display:inline-block;padding:10px 16px;border-radius:10px;border:2px solid var(--teal);background:var(--teal);color:#fff;font-weight:700;font-size:.95rem;cursor:pointer;text-decoration:none}
.button:hover{background:#0a4b52}
.button.ghost{background:transparent;color:var(--ink);border-color:var(--rule)}
.button.ghost:hover{border-color:var(--teal)}
@media (prefers-color-scheme:dark){.button{border-color:#2a8a92;background:#1b737b}.button:hover{background:#21848d}}

.thread-bar{display:flex;flex-wrap:wrap;align-items:center;gap:8px 14px}
.thread-sum{margin:0;flex:1;font-weight:600}
.edited-note{margin:12px 0 0;padding:9px 12px;background:var(--warn-bg);color:var(--warn);border-radius:8px;font-size:.9rem}
.empty{color:var(--soft);margin:16px 0 4px}
.spine{list-style:none;margin:16px 0 0;padding:0;position:relative}
.spine::before{content:"";position:absolute;left:13px;top:14px;bottom:14px;width:3px;background:var(--tint);border-radius:2px}
.post{position:relative;padding-left:40px;margin-bottom:14px}
.dot{position:absolute;left:3px;top:14px;width:23px;height:23px;border-radius:50%;background:var(--teal);border:4px solid var(--card)}
.post:first-child .dot{background:var(--coral)}
.card{border:1px solid var(--rule);border-radius:12px;padding:12px 14px;background:var(--card)}
.post.over .card{border-color:var(--bad);box-shadow:0 0 0 2px var(--bad-bg)}
.post.short .card{border-color:#d9a640}
.card-top{display:flex;justify-content:space-between;gap:10px;font-size:.85rem;color:var(--soft);font-weight:600}
.post.over .pc{color:var(--bad)}
.label-preview{margin:2px 0 6px;font-size:.8rem;color:var(--soft)}
.ptext{display:block;width:100%;border:1px solid transparent;border-radius:8px;padding:6px 8px;margin:0 -8px;width:calc(100% + 16px);resize:none;overflow:hidden;background:transparent;color:var(--ink);font:400 1rem/1.5 var(--sans)}
.ptext:hover{border-color:var(--rule)}
.pwarn{margin:6px 0 0;padding:6px 10px;border-radius:6px;font-size:.86rem;background:var(--warn-bg);color:var(--warn)}
.post.over .pwarn{background:var(--bad-bg);color:var(--bad)}
.card-tools{display:flex;flex-wrap:wrap;gap:6px;margin-top:8px}
.mini{padding:6px 11px;border-radius:999px;border:1px solid var(--rule);background:var(--bg);color:var(--ink);font-size:.84rem;font-weight:600;cursor:pointer}
.mini:hover{border-color:var(--teal)}
.mini:disabled{opacity:.45;cursor:default}

/* how it works band */
.band-light{background:var(--tint);margin-top:56px;padding:44px 0}
.steps-in{max-width:1200px;margin:0 auto;padding:0 20px}
.steps-in h2,.column>h2{font-size:1.7rem;font-weight:800;margin-bottom:18px}
.how{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,1fr);gap:18px;counter-reset:h}
.how li{counter-increment:h;background:var(--card);border-radius:12px;padding:18px;border:1px solid var(--rule)}
.how li::before{content:counter(h);display:inline-grid;place-items:center;width:30px;height:30px;border-radius:50%;background:var(--coral);color:#fff;font-weight:700;margin-bottom:10px}
.how h3{font-size:1.1rem;margin-bottom:6px}
.how p{margin:0;font-size:.95rem;color:var(--soft)}

/* columns, pages */
.column{max-width:740px;margin:0 auto;padding:36px 20px 0}
.column.wide{max-width:1200px}
.home-guides{padding-top:48px}
.trail ol{list-style:none;margin:0 0 18px;padding:0;display:flex;flex-wrap:wrap;gap:4px 8px;font-size:.88rem;color:var(--soft)}
.trail li+li::before{content:"›";margin-right:8px}
.trail a{color:var(--soft)}
.eyebrow{margin:0 0 8px;color:var(--coral-ink);font-weight:700;font-size:.86rem;text-transform:uppercase;letter-spacing:.07em}
.title{font-size:clamp(2rem,4.4vw,2.9rem);font-weight:800;margin-bottom:14px}
.intro{font-size:1.18rem;color:var(--soft);margin:0 0 18px}
.by{font-size:.9rem;color:var(--soft);margin:0 0 20px;padding-bottom:20px;border-bottom:1px solid var(--rule)}
.contents{background:var(--tint);border-radius:12px;padding:14px 18px;margin:0 0 28px}
.contents p{margin:0 0 6px;font-weight:700;font-size:.9rem}
.contents ol{margin:0;padding-left:20px;columns:2;column-gap:28px;font-size:.95rem}
.contents li{break-inside:avoid;margin-bottom:3px}
.copy h2{font-size:1.6rem;font-weight:800;margin:1.9em 0 .55em}
.copy h3{font-size:1.18rem;font-weight:600;margin:1.5em 0 .4em}
.copy p,.copy ul,.copy ol{margin:0 0 1.05em}
.copy li{margin-bottom:.35em}
.copy blockquote{margin:1.2em 0;padding:12px 16px;background:var(--card);border:1px solid var(--rule);border-left:5px solid var(--teal);border-radius:8px}
.copy blockquote p{margin:0 0 .6em}.copy blockquote p:last-child{margin:0}
.copy code{font-size:.9em;background:var(--tint);padding:1px 5px;border-radius:4px;overflow-wrap:anywhere}
.copy pre{background:var(--card);border:1px solid var(--rule);border-radius:10px;padding:14px 16px;overflow-x:auto;white-space:pre-wrap}
.copy pre code{background:none;padding:0}
.table-wrap{overflow-x:auto;margin:0 0 1.2em;border:1px solid var(--rule);border-radius:10px}
table{border-collapse:collapse;width:100%;font-size:.95rem;background:var(--card)}
th,td{text-align:left;padding:9px 12px;border-bottom:1px solid var(--rule);vertical-align:top}
th{background:var(--tint);font-weight:700}
tr:last-child td{border-bottom:0}
.qa{display:grid;gap:12px}
.qa-item{background:var(--card);border:1px solid var(--rule);border-radius:12px;padding:16px 18px}
.qa-item h3{font-size:1.08rem;margin-bottom:6px}
.qa-item p{margin:0;color:var(--soft)}
.column.wide .qa{grid-template-columns:1fr 1fr}
.cites{margin-top:2em;padding-top:14px;border-top:1px solid var(--rule);font-size:.92rem}
.cites-h{font-weight:700;margin:0 0 6px}
.cites ul{margin:0;padding-left:18px}
.small{font-size:.86rem;color:var(--soft);margin-top:20px}
.try{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;margin:30px 0 0;padding:18px 20px;background:var(--teal);color:var(--teal-ink);border-radius:14px}
.try p{margin:0;font:800 1.2rem var(--serif)}
.try .button{background:var(--coral);border-color:var(--coral);color:#1a0d08}
.next-prev{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:22px}
.next-prev a{display:block;padding:14px 16px;border:1px solid var(--rule);border-radius:12px;color:var(--ink);text-decoration:none;font-weight:600;line-height:1.35;background:var(--card)}
.next-prev a:hover{border-color:var(--teal)}
.next-prev span{display:block;font-size:.8rem;color:var(--soft);font-weight:400;margin-bottom:2px}
.tiles{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.tile{display:flex;flex-direction:column;gap:6px;padding:20px;border:1px solid var(--rule);border-radius:14px;background:var(--card);color:var(--ink);text-decoration:none;position:relative;overflow:hidden}
.tile:hover{border-color:var(--teal)}
.tile-n{font:800 2.4rem/1 var(--serif);color:var(--coral)}
.tile-t{font:800 1.18rem/1.3 var(--serif)}
.tile-d{color:var(--soft);font-size:.95rem}
.tile-m{margin-top:auto;font-size:.82rem;color:var(--soft)}
.lost{padding-bottom:30px}

/* footer */
.end{margin-top:70px;border-top:6px solid var(--teal);background:var(--card)}
.end-in{max-width:1200px;margin:0 auto;padding:34px 20px 18px;display:grid;grid-template-columns:2fr 1fr 1fr;gap:28px}
.end .brand{color:var(--ink);font-size:1.2rem}
.end .brand em{color:var(--coral-ink)}
.end-about p:last-child{color:var(--soft);font-size:.94rem;max-width:40ch}
.end-col h2{font:700 .82rem var(--sans);text-transform:uppercase;letter-spacing:.08em;color:var(--soft);margin-bottom:8px}
.end-col ul{list-style:none;margin:0;padding:0}
.end-col li{margin-bottom:6px;font-size:.94rem}
.end-note{max-width:1200px;margin:0 auto;padding:16px 20px 30px;font-size:.84rem;color:var(--soft);border-top:1px solid var(--rule)}
.mark{color:currentColor;flex:none}

@media (max-width:1000px){
  .engine{grid-template-columns:minmax(0,1fr)}
  .source{position:static}
  .how{grid-template-columns:1fr 1fr}
  .tiles{grid-template-columns:1fr 1fr}
}
@media (max-width:600px){
  body{font-size:1rem}
  .band-in,.hero-in,.engine,.steps-in,.column,.end-in,.end-note{padding-left:16px;padding-right:16px}
  .band-in{min-height:56px}
  .brand{font-size:1.1rem}
  .tabs a{padding:0 9px;font-size:.88rem}
  .hero{padding:18px 0 80px}
  .source,.thread{padding:14px}
  #src{min-height:200px}
  .how,.tiles,.column.wide .qa{grid-template-columns:1fr}
  .contents ol{columns:1}
  .next-prev{grid-template-columns:1fr}
  .end-in{grid-template-columns:1fr}
  .post{padding-left:34px}
  .spine::before{left:10px}
  .dot{left:0;width:23px}
}