/* iChallenge Arena v5 — white, bright, game-first. Accent comes from the arena's topic (set inline as --accent). */
:root{
  --accent:#4f46e5; --accent-soft:#eef0fd;
  --bg:#ffffff; --surface:#f6f7f9; --surface-2:#eef0f3; --line:#e4e7ec; --line-2:#d3d8df;
  --ink:#0e1116; --ink-2:#434b57; --ink-3:#6b7380;
  --good:#12805c; --good-soft:#e3f5ee; --bad:#c8322b; --bad-soft:#fcebea;
  --xp:#b7791f; --xp-soft:#fdf3e1; --flame:#e2531b;
  --bronze:#9a5b2a; --silver:#6b7684; --gold:#a57800; --platinum:#1f8a7f; --diamond:#4461e6;
  --display:"Bricolage Grotesque", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --body:"Figtree", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono:"JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  --r:14px; --r-sm:10px; --r-lg:22px;
  --shadow:0 1px 2px rgba(14,17,22,.06), 0 8px 24px -12px rgba(14,17,22,.14);
  --shadow-lg:0 2px 4px rgba(14,17,22,.05), 0 24px 48px -20px rgba(14,17,22,.22);
  color-scheme:light;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.55 var(--body);padding-inline:max(16px, env(safe-area-inset-left));-webkit-font-smoothing:antialiased}
img,svg{max-width:100%}
a{color:var(--accent);text-underline-offset:3px}
h1,h2,h3{font-family:var(--display);letter-spacing:-.015em;line-height:1.08;margin:0;text-wrap:balance}
h1{font-size:clamp(34px,5.4vw,60px);font-weight:800}
h2{font-size:clamp(24px,3vw,32px);font-weight:700}
h3{font-size:19px;font-weight:700}
p{margin:0}
.sr{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.hp{position:absolute!important;left:-9999px;width:1px;height:1px;opacity:0}
.skip{position:absolute;left:-9999px;top:8px;background:var(--ink);color:#fff;padding:8px 12px;border-radius:8px;z-index:50}
.skip:focus{left:16px}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px;border-radius:6px}
.muted{color:var(--ink-3)}
[hidden]{display:none!important}

/* ---------- nav ---------- */
.nav{position:sticky;top:env(safe-area-inset-top,0px);z-index:20;background:rgba(255,255,255,.9);backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid var(--line);margin-inline:calc(-1 * max(16px, env(safe-area-inset-left)))}
.nav-in{max-width:1180px;margin:0 auto;display:flex;align-items:center;gap:20px;padding:10px max(16px, env(safe-area-inset-left))}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);min-width:0}
.brand-mark svg{display:block}
.mark-bg{fill:var(--accent)}
.mark-a{fill:none;stroke:#fff;stroke-width:2.6;stroke-linecap:round;stroke-linejoin:round}
.brand-text{display:flex;flex-direction:column;line-height:1.1;min-width:0}
.brand-name{font-family:var(--display);font-weight:700;font-size:18px;letter-spacing:-.01em;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.brand-sub{font-size:11.5px;color:var(--ink-3);letter-spacing:.02em}
.nav-links{display:flex;gap:4px;margin-left:auto}
.nav-links a{color:var(--ink-2);text-decoration:none;font-weight:600;font-size:15px;padding:8px 12px;border-radius:999px}
.nav-links a:hover,.nav-links a[aria-current]{background:var(--surface);color:var(--ink)}
.chip-player{display:flex;align-items:center;gap:8px;text-decoration:none;color:var(--ink);padding:3px 12px 3px 3px;border:1px solid var(--line);border-radius:999px;background:#fff;flex-shrink:0}
.chip-player:hover{border-color:var(--line-2)}
.chip-meta{display:flex;flex-direction:column;line-height:1.1}
.chip-handle{font-weight:700;font-size:13.5px;max-width:120px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.chip-streak{display:flex;align-items:center;gap:3px;font-family:var(--mono);font-size:12px;color:var(--ink-3)}
.chip-streak svg{fill:none;stroke:currentColor;stroke-width:2}
.chip-streak.is-hot{color:var(--flame)}
.chip-streak.is-hot svg{fill:var(--flame);stroke:var(--flame)}
.lvl-ring{position:relative;display:inline-grid;place-items:center}
.lvl-ring svg{transform:rotate(-90deg);display:block}
.lvl-ring b{position:absolute;font-family:var(--mono);font-size:12px;font-weight:700}
.lvl-ring-lg b{font-size:30px}
.ring-track{fill:none;stroke:var(--surface-2);stroke-width:3.2}
.ring-fill{fill:none;stroke:var(--accent);stroke-width:3.2;stroke-linecap:round;transition:stroke-dasharray .8s cubic-bezier(.2,.8,.2,1)}
@media (max-width:760px){.nav-links{display:none}.chip-player{margin-left:auto}}

/* ---------- buttons, pills, forms ---------- */
.btn{appearance:none;border:0;font:700 15px/1 var(--body);border-radius:12px;padding:12px 18px;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:8px;text-decoration:none;transition:transform .12s ease, box-shadow .12s ease, background .12s ease;white-space:nowrap}
.btn:active{transform:translateY(1px)}
.btn[disabled]{opacity:.55;cursor:not-allowed}
.btn-primary{background:var(--accent);color:#fff;box-shadow:0 1px 0 rgba(0,0,0,.08), 0 6px 16px -8px var(--accent)}
.btn-primary:hover{filter:brightness(1.06)}
.btn-secondary{background:var(--accent-soft);color:var(--accent)}
.btn-secondary:hover{filter:brightness(.97)}
.btn-quiet{background:transparent;color:var(--ink-2);border:1px solid var(--line)}
.btn-quiet:hover{background:var(--surface)}
.btn-lg{font-size:17px;padding:16px 22px;border-radius:14px;width:100%}
.pill{display:inline-flex;align-items:center;gap:6px;font:600 12.5px/1 var(--body);padding:6px 10px;border-radius:999px;background:var(--surface);color:var(--ink-2)}
.pill-accent{background:var(--accent-soft);color:var(--accent)}
input,select,textarea{font:16px/1.4 var(--body);color:var(--ink);background:#fff;border:1.5px solid var(--line-2);border-radius:12px;padding:11px 13px;width:100%;min-width:0}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 4px var(--accent-soft)}
.field{display:flex;flex-direction:column;gap:6px}
.field label{font-weight:600;font-size:14px;color:var(--ink-2)}
.form-inline{display:flex;gap:8px;flex-wrap:wrap}
.form-inline input{flex:1 1 220px}
.form-card{display:flex;flex-direction:column;gap:14px;background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);padding:22px;box-shadow:var(--shadow)}
.form-note{font-size:14px;color:var(--ink-2);min-height:1.2em}
.form-note.is-bad{color:var(--bad)}
.form-note.is-good{color:var(--good)}

/* ---------- layout ---------- */
main{display:block}
.section{max-width:1180px;margin:0 auto;padding-block:56px 8px}
.sec-head{display:flex;flex-wrap:wrap;align-items:end;gap:10px 18px;margin-bottom:22px}
.sec-head h2{margin-right:auto}
.sec-head p{flex:1 0 100%;order:3;color:var(--ink-2);max-width:none;padding-right:max(0px, calc(100% - 64ch))}
.page{max-width:1180px;margin:0 auto;padding-block:36px 24px}
.crumbs{margin-bottom:18px;font-weight:600}
.crumbs a{text-decoration:none}
.lede{font-size:clamp(17px,1.6vw,19px);color:var(--ink-2);max-width:56ch;margin-top:14px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font:600 13px/1 var(--body);letter-spacing:.04em;text-transform:uppercase;color:var(--ink-3);margin-bottom:16px}
.eyebrow .dot{width:8px;height:8px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 4px var(--accent-soft)}

/* ---------- hero ---------- */
.hero{margin-inline:calc(-1 * max(16px, env(safe-area-inset-left)));padding-inline:max(16px, env(safe-area-inset-left));background:
  radial-gradient(900px 380px at 88% -10%, var(--accent-soft), transparent 70%),
  linear-gradient(#fff, #fff);border-bottom:1px solid var(--line)}
.hero-in{max-width:1180px;margin:0 auto;display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,.9fr);gap:40px;align-items:start;padding-block:48px 52px}
@media (max-width:920px){.hero-in{grid-template-columns:1fr;gap:28px;padding-block:32px 36px}}
.player-strip{display:grid;grid-template-columns:auto minmax(0,1.6fr) auto auto;gap:0;margin-top:30px;background:#fff;border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--shadow);overflow:hidden}
.ps-item{padding:12px 16px;display:flex;flex-direction:column;gap:3px;border-right:1px solid var(--line);min-width:0}
.ps-item:last-child{border-right:0}
.ps-label{font:600 11px/1 var(--body);letter-spacing:.06em;text-transform:uppercase;color:var(--ink-3)}
.ps-item b{font:700 22px/1.1 var(--mono);font-variant-numeric:tabular-nums}
.ps-sub{font-size:12.5px;color:var(--ink-3);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.ps-xp{justify-content:center}
@media (max-width:920px){.hero-copy .player-strip{display:none}}
.bar{height:8px;background:var(--surface-2);border-radius:999px;overflow:hidden}
.bar i{display:block;height:100%;background:var(--accent);border-radius:inherit;transition:width .9s cubic-bezier(.2,.8,.2,1)}
.bar-xp i{background:linear-gradient(90deg, var(--xp), #e0a43a)}
.league{font-family:var(--display)!important;font-size:19px!important;text-transform:capitalize}
.league[data-l="bronze"]{color:var(--bronze)}.league[data-l="silver"]{color:var(--silver)}.league[data-l="gold"]{color:var(--gold)}.league[data-l="platinum"]{color:var(--platinum)}.league[data-l="diamond"]{color:var(--diamond)}

/* ---------- round card (signature) ---------- */
.round{background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--shadow-lg);padding:22px;position:relative;overflow:hidden}
.round::before{content:"";position:absolute;inset:0 0 auto 0;height:5px;background:var(--accent)}
.round-top{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:14px}
.round-reset{font:500 13px/1 var(--mono);color:var(--ink-3)}
.round-title{font-size:30px;margin-bottom:10px}
.round-facts{display:flex;flex-wrap:wrap;gap:6px 18px;list-style:none;padding:0;margin:0 0 16px;color:var(--ink-2)}
.round-facts b{font-family:var(--mono);color:var(--ink)}
.round-diff{display:flex;gap:6px;margin-bottom:20px}
.round-diff i{flex:1;height:6px;border-radius:999px}
.round-diff .d0{background:#9bd8bf}.round-diff .d1{background:#f0c16a}.round-diff .d2{background:#ee8a77}
.round-idle .btn-quiet{width:100%;margin-top:10px}
.round-note{font-size:14px;color:var(--ink-3);margin-top:12px;text-align:center}

.q-head{display:flex;align-items:center;gap:12px;margin-bottom:16px}
.q-steps{display:flex;gap:5px;flex:1}
.q-steps i{flex:1;height:6px;border-radius:999px;background:var(--surface-2)}
.q-steps i.is-on{background:var(--accent)}
.q-steps i.is-ok{background:var(--good)}
.q-steps i.is-bad{background:var(--bad)}
.q-timer{position:relative;width:46px;height:46px;flex-shrink:0}
.q-timer svg{transform:rotate(-90deg)}
.q-timer circle{fill:none;stroke-width:4}
.q-timer .t-track{stroke:var(--surface-2)}
.q-timer .t-fill{stroke:var(--accent);stroke-linecap:round}
.q-timer.is-low .t-fill{stroke:var(--bad)}
.q-timer b{position:absolute;inset:0;display:grid;place-items:center;font:700 14px/1 var(--mono)}
.q-meta{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px;font:600 13px/1 var(--mono);color:var(--ink-3)}
.q-combo{color:var(--xp);background:var(--xp-soft);padding:4px 8px;border-radius:999px}
.q-text{font-family:var(--display);font-weight:700;font-size:clamp(21px,2.4vw,26px);line-height:1.2;margin-bottom:18px;min-height:2.4em}
.opts{display:grid;gap:10px}
.opt{appearance:none;width:100%;text-align:left;display:flex;align-items:center;gap:12px;background:#fff;border:1.5px solid var(--line-2);border-radius:14px;padding:14px;font:600 16px/1.3 var(--body);color:var(--ink);cursor:pointer;transition:border-color .12s, background .12s, transform .12s}
.opt:hover:not([disabled]){border-color:var(--accent);background:var(--accent-soft)}
.opt kbd{flex-shrink:0;width:28px;height:28px;border-radius:8px;display:grid;place-items:center;background:var(--surface);font:700 13px/1 var(--mono);color:var(--ink-2)}
.opt[disabled]{cursor:default}
.opt.is-right{border-color:var(--good);background:var(--good-soft)}
.opt.is-right kbd{background:var(--good);color:#fff}
.opt.is-wrong{border-color:var(--bad);background:var(--bad-soft)}
.opt.is-wrong kbd{background:var(--bad);color:#fff}
.opt.is-dim{opacity:.55}
.reveal{margin-top:14px;padding:12px 14px;border-radius:12px;background:var(--surface);font-size:15px;color:var(--ink-2);display:flex;gap:10px;align-items:flex-start}
.reveal b{color:var(--ink)}
.reveal .pts{margin-left:auto;font:700 16px/1.2 var(--mono);color:var(--good);white-space:nowrap}
.reveal.is-bad .pts{color:var(--bad)}
.q-next{margin-top:12px;width:100%}

.done-score{display:flex;align-items:baseline;gap:10px;margin:4px 0 6px}
.done-score b{font:800 clamp(48px,7vw,64px)/1 var(--display);letter-spacing:-.03em;font-variant-numeric:tabular-nums}
.done-score span{color:var(--ink-3);font-weight:600}
.done-grid{display:flex;gap:6px;margin:10px 0 16px}
.done-grid i{width:34px;height:34px;border-radius:9px;background:var(--bad-soft);border:1.5px solid var(--bad)}
.done-grid i.ok{background:var(--good-soft);border-color:var(--good)}
.done-rows{display:grid;gap:8px;margin-bottom:16px}
.done-row{display:flex;justify-content:space-between;gap:10px;font-size:15px;color:var(--ink-2)}
.done-row b{font-family:var(--mono);color:var(--ink)}
.done-xp{margin:6px 0 18px}
.done-xp .bar{height:12px}
.done-xp p{display:flex;justify-content:space-between;font:600 13px/1.2 var(--mono);color:var(--ink-3);margin-top:6px}
.levelup{display:flex;align-items:center;gap:12px;padding:12px 14px;border-radius:14px;background:var(--accent);color:#fff;margin-bottom:14px;font-weight:700}
.levelup b{font:800 26px/1 var(--display)}
.done-badges{display:grid;gap:8px;margin-bottom:16px}
.done-actions{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.done-actions .btn{width:100%}
.done-actions .span{grid-column:1/-1}

/* ---------- challenges ---------- */
.ch-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(290px,1fr));gap:16px}
.ch{display:flex;flex-direction:column;gap:10px;background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);padding:20px;transition:border-color .15s, box-shadow .15s}
.ch:hover{border-color:var(--line-2);box-shadow:var(--shadow)}
.ch-top{display:flex;justify-content:space-between;align-items:center}
.ch-xp{font:700 13px/1 var(--mono);color:var(--xp)}
.ch h3 a{color:var(--ink);text-decoration:none}
.ch h3 a:hover{color:var(--accent)}
.ch p{color:var(--ink-2);font-size:15px}
.ch .prize{display:flex;gap:8px;align-items:flex-start;background:var(--xp-soft);color:#6f4a0e;padding:10px 12px;border-radius:12px;font-size:14px}
.ch .prize svg{flex-shrink:0;fill:none;stroke:currentColor;stroke-width:2;margin-top:2px}
.ch-progress{display:flex;align-items:center;gap:10px;font:600 13px/1 var(--mono);color:var(--ink-3)}
.ch-progress .bar{flex:1}
.ch-foot{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-top:auto;padding-top:6px}
.ch-count{font-size:13.5px;color:var(--ink-3)}
.ch-actions{display:flex;gap:6px}
.ch.is-done{border-color:var(--good)}
.ch-done{font-weight:700;color:var(--good);font-size:14px}

/* ---------- leaderboard ---------- */
.seg{display:inline-flex;background:var(--surface);border-radius:12px;padding:4px;gap:2px}
.seg button{appearance:none;border:0;background:transparent;font:600 14px/1 var(--body);color:var(--ink-2);padding:9px 12px;border-radius:9px;cursor:pointer}
.seg button[aria-selected="true"]{background:#fff;color:var(--ink);box-shadow:0 1px 2px rgba(14,17,22,.1)}
.seg-sm button{font-size:13px;padding:7px 10px}
.lb{background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden}
.lb-list{list-style:none;margin:0;padding:0}
.lb-list li{display:grid;grid-template-columns:44px minmax(0,1fr) auto;align-items:center;gap:12px;padding:12px 18px;border-bottom:1px solid var(--line)}
.lb-list li:last-child{border-bottom:0}
.lb-rank{font:700 16px/1 var(--mono);color:var(--ink-3);text-align:center}
.lb-list li:nth-child(1) .lb-rank{color:#fff;background:var(--gold);border-radius:10px;padding:8px 0}
.lb-list li:nth-child(2) .lb-rank{color:#fff;background:var(--silver);border-radius:10px;padding:8px 0}
.lb-list li:nth-child(3) .lb-rank{color:#fff;background:var(--bronze);border-radius:10px;padding:8px 0}
.lb-who{display:flex;flex-direction:column;min-width:0}
.lb-who b{font-weight:700;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.lb-who span{font-size:13px;color:var(--ink-3)}
.lb-xp{font:700 16px/1 var(--mono);font-variant-numeric:tabular-nums}
.lb-xp small{font-size:12px;color:var(--ink-3);font-weight:500;margin-left:3px}
.lb-list li.is-me{background:var(--accent-soft)}
.lb-empty{display:block!important;text-align:center;color:var(--ink-3);padding:28px!important}
.lb-me{padding:12px 18px;border-top:1px solid var(--line);background:var(--surface);font-weight:600;color:var(--ink-2)}

/* ---------- badges ---------- */
.medals{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:10px}
.medal{display:flex;gap:12px;align-items:center;padding:12px;border:1px solid var(--line);border-radius:var(--r);background:#fff}
.medal div{display:flex;flex-direction:column;min-width:0}
.medal b{font-size:15px}
.medal span{font-size:13px;color:var(--ink-3)}
.medal-svg{flex-shrink:0}
.medal-ring{fill:var(--accent-soft);stroke:var(--accent);stroke-width:2}
.medal-core{fill:var(--accent)}
.medal-glyph{fill:none;stroke:#fff;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.medal.is-locked .medal-ring{fill:var(--surface);stroke:var(--line-2)}
.medal.is-locked .medal-core{fill:var(--surface-2)}
.medal.is-locked .medal-glyph{stroke:var(--ink-3)}
.medal.is-locked b{color:var(--ink-2)}
.medal.is-new{border-color:var(--accent);box-shadow:0 0 0 4px var(--accent-soft)}

/* ---------- save + sponsor ---------- */
.save{margin-top:56px}
.save-in{max-width:1180px;margin:0 auto;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:14px 32px;align-items:center;background:var(--surface);border-radius:var(--r-lg);padding:28px}
.save-in p{color:var(--ink-2);margin-top:8px}
.save-in .form-note:empty{display:none}
.save-in .form-note{grid-column:2}
@media (max-width:820px){.save-in{grid-template-columns:1fr}.save-in .form-note{grid-column:1}}
.save.is-saved .save-in{background:var(--good-soft)}
.sponsor{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:32px;align-items:start}
.sponsor-copy p{color:var(--ink-2);margin-top:12px;max-width:52ch}
@media (max-width:820px){.sponsor{grid-template-columns:1fr}}
.ticks{list-style:none;padding:0;margin:18px 0 0;display:grid;gap:10px}
.ticks li{position:relative;padding-left:30px;color:var(--ink-2)}
.ticks li::before{content:"";position:absolute;left:0;top:3px;width:18px;height:18px;border-radius:6px;background:var(--accent-soft) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M6 12.5l4 4L18 8' fill='none' stroke='%23666' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/13px no-repeat}

/* ---------- faq ---------- */
.faq{display:grid;gap:8px;max-width:820px}
.faq details{border:1px solid var(--line);border-radius:var(--r);background:#fff;padding:0 18px}
.faq summary{cursor:pointer;font-weight:700;padding:16px 0;list-style:none;display:flex;justify-content:space-between;gap:12px}
.faq summary::after{content:"+";font:700 20px/1 var(--mono);color:var(--ink-3)}
.faq details[open] summary::after{content:"–"}
.faq summary::-webkit-details-marker{display:none}
.faq p{padding:0 0 16px;color:var(--ink-2)}

/* ---------- hub ---------- */
.search{display:flex;gap:8px;margin-top:24px;max-width:560px}
.search input{flex:1}
.arena-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:14px}
.arena{display:flex;flex-direction:column;gap:6px;text-decoration:none;color:var(--ink);background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);padding:18px;transition:transform .15s, box-shadow .15s, border-color .15s}
.arena:hover{transform:translateY(-2px);box-shadow:var(--shadow);border-color:var(--line-2)}
.arena-topic{font:600 12px/1 var(--body);letter-spacing:.05em;text-transform:uppercase;color:var(--accent)}
.arena-name{font:700 20px/1.15 var(--display);letter-spacing:-.01em;overflow-wrap:anywhere}
.arena-meta{font-size:14px;color:var(--ink-3)}
.arena-go{margin-top:auto;padding-top:8px;font-weight:700;color:var(--accent)}
.arena-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:10px;margin-top:24px}
.arena-row{flex-direction:row;align-items:center;gap:12px;padding:14px 16px}
.arena-row .arena-name{font-size:17px;flex:1;min-width:0}
.arena-row .arena-go{padding:0;margin:0}
.topic-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:10px}
.topic{display:flex;justify-content:space-between;align-items:baseline;gap:8px;padding:14px 16px;border-radius:var(--r);background:var(--surface);text-decoration:none;color:var(--ink);font-weight:700}
.topic:hover{background:var(--accent-soft);color:var(--accent)}
.topic-count{font:500 13px/1 var(--mono);color:var(--ink-3)}
.how{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px;counter-reset:how}
.how li{counter-increment:how;display:flex;flex-direction:column;gap:6px;padding:20px;border:1px solid var(--line);border-radius:var(--r-lg);background:#fff}
.how li::before{content:counter(how);width:32px;height:32px;border-radius:10px;display:grid;place-items:center;background:var(--accent);color:#fff;font:700 15px/1 var(--mono);margin-bottom:6px}
.how b{font-family:var(--display);font-size:19px}
.how span{color:var(--ink-2);font-size:15px}
.pager{display:flex;justify-content:space-between;align-items:center;margin-top:24px;font-weight:600}

/* ---------- detail + profile + prose ---------- */
.detail{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(0,1fr);gap:36px;align-items:start}
.detail-main h2{margin-top:32px;margin-bottom:12px;font-size:24px}
.detail-side{display:grid;gap:16px;position:sticky;top:80px}
@media (max-width:900px){.detail{grid-template-columns:1fr}.detail-side{position:static}}
.steps{padding-left:22px;display:grid;gap:8px;color:var(--ink-2)}
.callout{display:flex;flex-direction:column;gap:4px;margin-top:20px;padding:16px;border-radius:var(--r);background:var(--xp-soft);color:#5e3f0c}
.gallery{display:grid;gap:10px}
.entry{border:1px solid var(--line);border-radius:var(--r);padding:14px 16px;display:grid;gap:8px;background:#fff}
.entry-top{display:flex;justify-content:space-between;align-items:center;gap:10px}
.entry-top b{font-weight:700}
.entry p{color:var(--ink-2);font-size:15px;white-space:pre-line;overflow-wrap:anywhere}
.entry-foot{display:flex;justify-content:space-between;align-items:center;gap:10px;font-size:14px}
.entry .ok{color:var(--good);font-weight:700}
.profile-head{display:flex;gap:22px;align-items:center;flex-wrap:wrap}
.profile-head h1{font-size:clamp(30px,4vw,44px);overflow-wrap:anywhere}
.form-handle{margin-top:12px;max-width:380px}
.stats{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:10px;margin-top:28px}
.stat{padding:14px 16px;border:1px solid var(--line);border-radius:var(--r);display:flex;flex-direction:column;gap:4px}
.stat span{font-size:13px;color:var(--ink-3);font-weight:600}
.stat b{font:700 26px/1.1 var(--mono);font-variant-numeric:tabular-nums}
.invite{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.invite code{flex:1 1 260px;min-width:0;overflow-wrap:anywhere;font:500 14px/1.4 var(--mono);background:var(--surface);padding:12px 14px;border-radius:12px}
.history{list-style:none;padding:0;margin:0;display:grid;gap:6px}
.history li{display:grid;grid-template-columns:minmax(0,1fr) auto auto;gap:14px;padding:12px 14px;border:1px solid var(--line);border-radius:12px;font-size:15px;align-items:center}
.history li b{font-family:var(--mono)}
.prose{max-width:820px}
.prose h2{margin:34px 0 10px;font-size:24px}
.prose ul{padding-left:20px;display:grid;gap:8px;color:var(--ink-2)}

/* ---------- footer ---------- */
.foot{margin-top:72px;border-top:1px solid var(--line);margin-inline:calc(-1 * max(16px, env(safe-area-inset-left)));padding-inline:max(16px, env(safe-area-inset-left));background:var(--surface)}
.foot-in{max-width:1180px;margin:0 auto;display:grid;grid-template-columns:minmax(0,1.4fr) repeat(3,minmax(0,1fr));gap:28px;padding-block:40px 24px}
.foot-brand p{color:var(--ink-2);font-size:14.5px;margin-top:12px;max-width:40ch}
.foot-col h3{font:700 13px/1 var(--body);letter-spacing:.05em;text-transform:uppercase;color:var(--ink-3);margin-bottom:12px}
.foot-col ul{list-style:none;padding:0;margin:0;display:grid;gap:8px}
.foot-col a{color:var(--ink);text-decoration:none;font-weight:600;font-size:14.5px}
.foot-col a:hover{color:var(--accent)}
.foot-col li span{display:block;font-size:12.5px;color:var(--ink-3)}
.foot-base{max-width:1180px;margin:0 auto;display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px;padding-block:16px 28px;border-top:1px solid var(--line);font-size:13px;color:var(--ink-3)}
@media (max-width:900px){.foot-in{grid-template-columns:1fr 1fr}.foot-brand{grid-column:1/-1}}
@media (max-width:520px){.foot-in{grid-template-columns:1fr}}

/* ---------- dialog + toasts ---------- */
dialog{border:0;border-radius:var(--r-lg);padding:0;max-width:min(520px, calc(100vw - 32px));width:100%;box-shadow:var(--shadow-lg)}
dialog::backdrop{background:rgba(14,17,22,.35)}
.dlg{padding:22px;display:grid;gap:14px}
.dlg-actions{display:flex;gap:8px;justify-content:flex-end}
.toasts{position:fixed;left:50%;bottom:calc(16px + env(safe-area-inset-bottom,0px));transform:translateX(-50%);display:grid;gap:8px;z-index:60;width:min(440px, calc(100vw - 32px))}
.toast{display:flex;gap:12px;align-items:center;background:var(--ink);color:#fff;border-radius:14px;padding:12px 14px;box-shadow:var(--shadow-lg);animation:toast-in .3s cubic-bezier(.2,.8,.2,1)}
.toast .medal-svg{width:36px;height:36px}
.toast b{display:block}
.toast span{font-size:14px;opacity:.8}
@keyframes toast-in{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
@keyframes pop{0%{transform:scale(.6);opacity:0}60%{transform:scale(1.12);opacity:1}100%{transform:scale(1)}}
@keyframes shake{0%,100%{transform:none}25%{transform:translateX(-5px)}75%{transform:translateX(5px)}}
.is-pop{animation:pop .35s cubic-bezier(.2,.8,.2,1)}
.is-shake{animation:shake .3s ease}
@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}

/* house sponsors */
.ch-spons{display:flex;flex-wrap:wrap;align-items:center;gap:4px 10px;margin:0;font-size:13px!important;color:var(--ink-3)!important}
.ch-spons span{font:700 11px/1 var(--body);letter-spacing:.06em;text-transform:uppercase;color:var(--ink-3)}
.ch-spons a{color:var(--ink-2);font-weight:600;text-decoration:none;border-bottom:1px solid var(--line)}
.ch-spons a:hover{color:var(--accent);border-color:currentColor}
.spons-head{font:700 13px/1 var(--body);letter-spacing:.05em;text-transform:uppercase;color:var(--ink-3);margin:26px 0 10px}
.spons-grid{list-style:none;padding:0;margin:12px 0 0;display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:10px}
.spons-tile{display:flex;gap:12px;align-items:center;padding:12px 14px;border:1px solid var(--line);border-radius:14px;background:var(--surface);color:var(--ink);text-decoration:none;min-height:64px}
.spons-tile:hover{border-color:var(--accent)}
.spons-tile b{display:block;font-size:15px}
.spons-tile small{display:block;font-size:12.5px;color:var(--ink-3);line-height:1.35;margin-top:2px}
.spons-mono{flex-shrink:0;width:36px;height:36px;border-radius:10px;display:grid;place-items:center;background:var(--accent-soft);color:var(--accent);font:800 16px/1 var(--display)}
.spons-note{font-size:14px;margin-top:10px}
.sponsor-copy .spons-grid{grid-template-columns:1fr;max-width:420px}
.arena-soon{opacity:.6;cursor:default}
.arena-soon .arena-go{color:var(--ink-3)}