:root{
  --bg:#F3F4F8;--surface:#FFFFFF;--ink:#161A2B;--muted:#5A6075;--soft-ink:#3B4055;
  --line:#E2E4EC;--line-2:#EEF0F5;--accent:#5B3DF5;--accent-ink:#3A22C4;--accent-soft:#ECE8FF;--accent-deep:#1E1266;
  --hint-bg:#FFF6E0;--hint-ink:#5C3D00;--good-bg:#DDF5E6;--good-ink:#0E5A2C;--bad-bg:#FDE4DA;--bad-ink:#8A2A08;
  --dark:#161A2B;--dark-2:#2A2F45;
  --display:'Bricolage Grotesque',system-ui,sans-serif;--body:'Figtree',system-ui,sans-serif;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--body);font-size:16px;line-height:1.5}
a{color:#4A2FE0}a:hover{color:#2E1BA8}
button{font-family:inherit;cursor:pointer}
img,svg{display:block}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip{position:absolute;left:-9999px}.skip:focus{left:16px;top:8px;z-index:50;background:#fff;padding:8px 12px;border-radius:8px}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px}

/* header */
.top{background:var(--surface);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.top-in{max-width:1320px;margin:0 auto;padding:10px 24px;display:flex;align-items:center;gap:20px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);flex:none}
.brand:hover{color:var(--ink)}
.brand span{font-family:var(--display);font-weight:800;font-size:24px;letter-spacing:-.5px}
.search{flex:1 1 280px;max-width:520px;display:flex;align-items:center;gap:10px;background:var(--bg);border:1px solid var(--line);border-radius:999px;padding:0 16px;height:44px}
.search input{flex:1;border:0;background:transparent;font:inherit;color:var(--ink);outline:none;min-width:0}
.top-actions{margin-left:auto;display:flex;gap:10px;flex:none}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:44px;padding:0 18px;border-radius:999px;border:1px solid var(--line);background:var(--surface);color:var(--ink);font-weight:600;font-size:15px;text-decoration:none}
.btn:hover{color:var(--ink);border-color:#C9CCDA}
.btn-primary{background:var(--accent);border-color:var(--accent);color:#fff}
.btn-primary:hover{color:#fff;background:#4A2FE0}
.icon-btn{display:none;width:44px;height:44px;border:0;background:transparent;align-items:center;justify-content:center;color:var(--ink);border-radius:12px}
.chips{display:none}

/* layout */
.wrap{max-width:1320px;margin:0 auto;padding:24px;display:flex;gap:28px;align-items:flex-start}
.side{flex:0 0 220px;position:sticky;top:88px;display:flex;flex-direction:column;gap:2px}
.side a{display:flex;align-items:center;gap:12px;padding:10px 14px;border-radius:12px;color:var(--ink);font-weight:600;text-decoration:none}
.side a:hover{background:#E9EAF1;color:var(--ink)}
.side a[aria-current="page"]{background:var(--accent-soft);color:var(--accent-ink);font-weight:700}
.side .cat{font-weight:500;padding:8px 14px}
.side-h{margin:18px 14px 6px;font-size:13px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.feed{flex:1 1 auto;min-width:0;max-width:680px;display:flex;flex-direction:column;gap:18px}
.rail{flex:0 0 290px;display:flex;flex-direction:column;gap:18px;position:sticky;top:88px}

.feed-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;flex-wrap:wrap}
.feed-head h1{margin:0;font-family:var(--display);font-weight:800;font-size:34px;letter-spacing:-.6px;line-height:1.15}
.feed-intro{margin:-6px 0 0;color:var(--muted)}
.solved{font-weight:600;color:var(--muted)}.solved b{color:var(--accent)}
.crumbs{font-size:14px;color:var(--muted)}.crumbs a{color:var(--muted)}

/* riddle card */
.card{background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:24px 26px;display:flex;flex-direction:column;gap:16px}
.card-top{display:flex;align-items:center;justify-content:space-between;gap:12px}
.pill{font-size:13px;font-weight:700;padding:5px 12px;border-radius:999px;background:var(--bg);color:var(--soft-ink);text-decoration:none}
.pill:hover{color:var(--ink);background:#E9EAF1}
.num{font-size:14px;color:var(--muted);text-decoration:none;padding:10px 0}a.num,a.num:hover,a.num:visited{color:var(--muted);text-decoration:none;cursor:default}
.q{margin:0;font-family:var(--display);font-weight:600;font-size:24px;line-height:1.3;letter-spacing:-.2px}
.q a{color:inherit;text-decoration:none}.q a:hover{color:inherit;text-decoration:underline;text-decoration-thickness:2px;text-underline-offset:4px}
.hint{display:flex;gap:10px;align-items:flex-start;background:var(--hint-bg);border-radius:12px;padding:12px 14px;color:var(--hint-ink)}
.hint svg{flex:none;margin-top:2px}
.answer{background:var(--accent-soft);border-radius:14px;padding:16px 18px;display:flex;flex-direction:column;gap:4px}
.answer-label{font-size:13px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--accent-ink)}
.answer-text{font-family:var(--display);font-weight:800;font-size:26px;color:var(--accent-deep);line-height:1.2}
.answer-why{color:var(--soft-ink);margin-top:4px}
.actions{display:flex;gap:10px;flex-wrap:wrap}
.actions .btn{height:46px;font-size:16px}
.actions .btn-primary{padding:0 22px;font-weight:700}
.judge{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.judge-q{font-weight:600;color:var(--soft-ink);margin-right:4px}
.got,.miss{height:44px;padding:0 18px;border-radius:999px;border:0;font-weight:700;font-size:15px}
.got{background:var(--good-bg);color:var(--good-ink)}.miss{background:var(--bad-bg);color:var(--bad-ink)}
.verdict{font-weight:700}.verdict.ok{color:var(--good-ink)}.verdict.no{color:var(--bad-ink)}
.card-foot{display:flex;gap:6px;border-top:1px solid var(--line-2);padding-top:12px}
.ghost{display:inline-flex;align-items:center;gap:8px;height:40px;padding:0 12px;border-radius:10px;border:0;background:transparent;color:var(--soft-ink);font-weight:600;font-size:14px;text-decoration:none}
.ghost:hover{background:var(--bg);color:var(--ink)}
.card-foot .open{margin-left:auto;color:#4A2FE0}
[hidden]{display:none!important}

/* rail */
.daily{background:var(--dark);color:#fff;border-radius:18px;padding:22px;display:flex;flex-direction:column;gap:14px}
.daily-top{display:flex;align-items:center;justify-content:space-between;gap:8px}
.daily-label{font-size:13px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:#C9BFFF}
.daily-date{font-size:13px;color:#B4B8C8}
.daily-q{margin:0;font-family:var(--display);font-weight:600;font-size:20px;line-height:1.35}
.daily-a{background:var(--dark-2);border-radius:12px;padding:12px 14px;font-family:var(--display);font-weight:800;font-size:22px}
.daily button{height:44px;border-radius:999px;border:0;background:#fff;color:var(--ink);font-weight:700;font-size:15px}
.daily a{color:#C9BFFF}
.streak{background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:20px;display:flex;gap:14px;align-items:center}
.streak-ico{width:52px;height:52px;border-radius:14px;background:#FFF1CC;display:flex;align-items:center;justify-content:center;flex:none}
.streak b{display:block;font-size:17px}
.streak span{font-size:14px;color:var(--muted)}
.foot-links{font-size:13px;color:var(--muted);display:flex;flex-wrap:wrap;gap:6px 14px;padding:0 4px}
.foot-links a{color:var(--muted)}

.prose{background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:28px 30px}
.prose h1{margin-top:0;font-family:var(--display);font-weight:800;font-size:34px;letter-spacing:-.6px}
.prose h2{font-family:var(--display);font-size:22px;margin-top:28px}
.more{display:flex;flex-direction:column;gap:8px}
.more h2{font-family:var(--display);font-size:22px;margin:10px 0 4px}
.more a{display:block;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:14px 18px;color:var(--ink);text-decoration:none;font-weight:600}
.more a:hover{border-color:#C9CCDA}
.empty{color:var(--muted);text-align:center;padding:24px}
.site-foot{max-width:1320px;margin:0 auto;padding:8px 24px 40px;color:var(--muted);font-size:14px}

/* tablet: drop right rail below */
@media (max-width:1180px){
  .rail{display:none}
  .feed{max-width:none}
}
/* phone */
@media (max-width:860px){
  .side{display:none}
  .wrap{padding:14px 16px 24px;display:block}
  .top{position:sticky}
  .top-in{padding:6px 8px;gap:4px}
  .brand span{font-size:21px}
  .brand svg{width:30px;height:30px}
  .icon-btn{display:inline-flex}
  .search,.top-actions .btn:not(.btn-primary){display:none}
  .top-actions{gap:4px}
  .top-actions .btn-primary{height:38px;padding:0 14px;font-size:14px}
  .search.open{display:flex;position:absolute;left:8px;right:8px;top:6px;max-width:none;background:#fff;z-index:2}
  .chips{display:flex;gap:8px;overflow-x:auto;padding:2px 16px 12px;scrollbar-width:none}
  .chips::-webkit-scrollbar{display:none}
  .chips a{flex:none;display:flex;align-items:center;height:38px;padding:0 14px;border-radius:999px;font-weight:600;font-size:14px;text-decoration:none;white-space:nowrap;background:var(--bg);color:var(--ink);border:1px solid var(--line)}
  .chips a[aria-current="page"]{background:var(--accent);border-color:var(--accent);color:#fff}
  .feed{gap:14px}
  .feed-head h1{font-size:28px}
  .card{padding:18px;gap:14px}
  .q{font-size:20px}
  .answer-text{font-size:23px}
  .actions .btn-primary{flex:1}
  .rail-mobile{display:block}
  .prose{padding:22px 20px}
}
.rail-mobile{display:none}
@media (max-width:860px){.rail-mobile{display:block}}
.mobile-menu{position:fixed;inset:0;z-index:40;background:rgba(22,26,43,.4)}
.mobile-menu nav{background:#fff;width:min(300px,85vw);height:100%;overflow-y:auto;padding:16px 10px;display:flex;flex-direction:column;gap:2px}
.mobile-menu nav a{padding:12px 14px;border-radius:12px;color:var(--ink);text-decoration:none;font-weight:600}
.mobile-menu nav a[aria-current="page"]{background:var(--accent-soft);color:var(--accent-ink)}

.cards{display:flex;flex-direction:column;gap:18px}
.next-page{display:flex;align-items:center;justify-content:center;height:52px;border-radius:999px;border:1px dashed #C9CCDA;color:var(--soft-ink);font-weight:700;text-decoration:none;background:var(--surface)}
.next-page:hover{color:var(--ink);border-color:var(--accent)}
.feed-end{color:var(--muted);text-align:center;padding:16px;font-weight:600}
.daily-q-link{color:inherit;text-decoration:none}.daily-q-link:hover{color:inherit;text-decoration:underline;text-decoration-thickness:2px;text-underline-offset:4px}
.pin-fig{margin:4px 0 0;display:flex;flex-direction:column;align-items:center;gap:8px}.pin-fig img{width:100%;max-width:300px;height:auto;border-radius:16px;border:1px solid var(--line)}.pin-fig figcaption{font-size:14px;color:var(--muted)}
.daily-big{padding:28px}
.daily-big .daily-q{font-size:26px}
@media (max-width:860px){.cards{gap:14px}.daily-big .daily-q{font-size:21px}}
.sub-h{font-family:var(--display);font-size:24px;margin:10px 0 0}
@media (max-width:860px){.judge-q{flex-basis:100%}.judge .got,.judge .miss{flex:1}}
@media (max-width:860px){.pin-fig img{max-width:220px}}

.about{background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:24px 26px;margin-top:10px;color:var(--soft-ink)}
.about h2{font-family:var(--display);font-size:22px;color:var(--ink);margin:0 0 8px}
.about p{margin:0 0 12px}
.related{display:flex;flex-wrap:wrap;gap:8px;margin-top:8px}
.related a{font-size:14px;font-weight:600;padding:8px 14px;border-radius:999px;background:var(--bg);color:var(--soft-ink);text-decoration:none}
.related a:hover{color:var(--ink);background:#E9EAF1}