/* 筑竞 · 站点样式（v4 视觉：onda 配色 + 黑白↔彩色封面 + 环形轮播） */
:root{
  --paper:#ffffff; --mist:#f4f6f9; --ink:#0a0b0d; --line:#e4e7ec; --grid-dot:#e1e5eb;
  --muted:#5f6672; --muted-2:#98a0ad;
  --acc:#7c3aed; --acc-600:#6d28d9; --acc-700:#5b21b6; --acc-200:#ddd6fe; --acc-50:#f5f3ff; --acc-300:#c4b5fd;
  --cat-b:#6d28d9; --cat-c:#0f766e; --cat-d:#a16207;
  --cat-b-t:rgba(109,40,217,.10); --cat-c-t:rgba(15,118,110,.10); --cat-d-t:rgba(161,98,7,.12);
  --pill:999px; --r:16px;
  --sans:"Geist","PingFang SC","Noto Sans SC",sans-serif;
  --mono:"Geist","SFMono-Regular",Consolas,monospace;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:16px;line-height:1.7;-webkit-font-smoothing:antialiased;overflow-x:hidden;
  background-image:radial-gradient(var(--grid-dot) 1px,transparent 1px);background-size:24px 24px}
.wrap{max-width:1120px;margin:0 auto;padding:0 24px}
.eyebrow{font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);font-weight:600}
.mono{font-family:var(--mono)}
::selection{background:var(--acc-200)}
a{color:inherit}
/* header */
header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.82);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{display:flex;align-items:baseline;gap:10px;font-weight:900;font-size:22px;letter-spacing:.02em;text-decoration:none}
.logo small{font-family:var(--mono);font-size:11px;letter-spacing:.18em;color:var(--muted);font-weight:500}
.navlinks{display:flex;gap:4px}
.navlinks a{color:var(--muted);text-decoration:none;font-size:14px;font-weight:500;padding:8px 14px;border-radius:var(--pill)}
.navlinks a:hover{background:var(--mist);color:var(--ink)}
.navlinks a.on{background:var(--ink);color:#fff}
/* hero */
.hero{padding:72px 0 8px;text-align:center}
.hero .tag{display:inline-flex;align-items:center;gap:10px;background:#fff;border:1px solid var(--line);border-radius:var(--pill);padding:8px 18px;font-size:12px;letter-spacing:.14em;color:var(--muted);font-weight:600}
.hero .tag b{color:var(--ink)}
.hero .tag .bullet{width:7px;height:7px;border-radius:50%;background:var(--acc)}
.hero h1{font-size:60px;line-height:1.12;font-weight:900;letter-spacing:-.02em;margin:24px 0 16px}
.hero h1 em{font-style:normal;color:var(--acc-600)}
.hero p.sub{color:var(--muted);font-size:17px;max-width:600px;margin:0 auto 28px}
.cta{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;border-radius:var(--pill);padding:13px 26px;font-size:15px;font-weight:600;text-decoration:none;cursor:pointer;border:1px solid transparent}
.btn-dark{background:var(--ink);color:#fff}
.btn-dark:hover{background:var(--acc-600)}
.btn-ghost{background:#fff;color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--ink)}
.btn-white{background:#fff;color:var(--ink)}
.btn-white:hover{background:var(--acc-200)}
.btn-sm{padding:9px 18px;font-size:13px}
/* page head (non-home) */
.phead{padding:56px 0 8px}
.phead h1{font-size:40px;font-weight:900;letter-spacing:-.02em}
.phead p{color:var(--muted);margin-top:8px;max-width:640px}
/* ring */
.ringsec{padding:26px 0 64px}
.ringhead{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}
.stage{position:relative;height:460px;perspective:1600px;perspective-origin:50% 42%;touch-action:pan-y}
.ring{position:absolute;inset:0;transform-style:preserve-3d}
.card{position:absolute;left:50%;top:20px;width:264px;height:392px;margin-left:-132px;border-radius:var(--r);background:#fff;border:1px solid var(--line);overflow:hidden;text-decoration:none;
  box-shadow:0 10px 30px rgba(10,11,13,.10);transition:transform .7s cubic-bezier(.22,.8,.24,1),opacity .5s,box-shadow .5s;backface-visibility:hidden}
.card.active{box-shadow:0 24px 60px rgba(109,40,217,.18);border-color:var(--acc-200)}
.ccover{position:relative;height:200px;background:var(--mist);overflow:hidden;display:block}
.ccover .art{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;filter:grayscale(1);opacity:.5;transition:filter .5s ease,opacity .5s ease}
.card:hover .ccover .art,.card.active .ccover .art{filter:none;opacity:1}
.cno{position:absolute;top:10px;right:12px;font-family:var(--mono);font-size:11px;font-weight:700;color:var(--muted);background:rgba(255,255,255,.85);border:1px solid var(--line);border-radius:var(--pill);padding:2px 9px;z-index:2}
.cbody{padding:16px 18px 18px;text-align:center}
.badge{display:inline-block;border-radius:var(--pill);font-family:var(--mono);font-size:11px;font-weight:700;padding:2px 10px;margin-bottom:9px}
.bA{background:rgba(10,11,13,.08);color:var(--ink)} .bB{background:var(--cat-b-t);color:var(--cat-b)} .bC{background:var(--cat-c-t);color:var(--cat-c)} .bD{background:var(--cat-d-t);color:var(--cat-d)}
.cname{display:block;font-size:15px;font-weight:700;line-height:1.45;letter-spacing:-.01em;margin-bottom:8px;min-height:44px;color:var(--ink);text-align:center}
.cmeta{font-size:12px;color:var(--muted-2);display:flex;flex-wrap:wrap;gap:8px;justify-content:center}
.ringctl{display:flex;align-items:center;justify-content:center;gap:18px;margin-top:6px}
.arrow{width:42px;height:42px;border-radius:50%;border:1px solid var(--line);background:#fff;color:var(--ink);font-size:16px;cursor:pointer;display:grid;place-items:center}
.arrow:hover{border-color:var(--ink)}
.dots{display:flex;gap:7px;flex-wrap:wrap;justify-content:center}
.dots i{width:7px;height:7px;border-radius:50%;background:var(--line);cursor:pointer;transition:.3s}
.dots i.on{background:var(--acc);width:22px;border-radius:var(--pill)}
.hint{text-align:center;color:var(--muted-2);font-size:12px;letter-spacing:.08em;margin-top:14px}
/* stats */
.cols{display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:18px;padding:8px 0 72px}
.colcard{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:26px;text-decoration:none;display:block}
.colcard.lead{background:var(--ink);color:#fff;border-color:var(--ink)}
.colcard .n{font-family:var(--mono);font-size:46px;font-weight:700;line-height:1}
.colcard.lead .n{font-size:64px;color:var(--acc-300)}
.colcard .n small{font-size:13px;color:var(--muted-2);font-weight:500;margin-left:6px;font-family:var(--sans)}
.colcard.lead .n small{color:rgba(255,255,255,.55)}
.colcard h3{font-size:16px;font-weight:700;margin:8px 0 14px}
.dist{display:flex;height:8px;border-radius:var(--pill);overflow:hidden;background:var(--mist)}
.colcard.lead .dist{background:rgba(255,255,255,.12)}
.dist i{display:block;height:100%}
/* dark band / calculator */
.dark{background:var(--ink);color:#fff;padding:76px 0;text-align:center}
.dark .eyebrow{color:rgba(255,255,255,.5)}
.dark h2{font-size:38px;font-weight:900;letter-spacing:-.02em;margin:14px 0 12px}
.dark h2 em{font-style:normal;color:var(--acc-300)}
.dark p{color:rgba(255,255,255,.62);max-width:560px;margin:0 auto 30px}
.calc{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-bottom:26px}
.sel{display:inline-flex;align-items:center;gap:8px;background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.16);color:#fff;border-radius:var(--pill);padding:10px 18px;font-size:14px}
.sel b{color:rgba(255,255,255,.45);font-weight:500}
.sel select,.sel input{background:transparent;border:none;color:#fff;font:inherit;outline:none;cursor:pointer}
.sel select option{color:#0a0b0d}
.sel input[type=number]{width:56px;text-align:center}
.out{font-family:var(--mono);font-size:88px;font-weight:700;line-height:1;color:var(--acc-300)}
.out small{font-size:16px;color:rgba(255,255,255,.6);font-weight:500;margin-left:10px;font-family:var(--sans)}
.outsub{font-size:15px;color:rgba(255,255,255,.75);margin-top:10px}
.dark .note{font-size:13px;color:rgba(255,255,255,.45);margin:14px 0 28px;max-width:640px;margin-left:auto;margin-right:auto}
/* library / filters / grid */
.lib{padding:64px 0}
.libhead{display:flex;align-items:flex-end;justify-content:space-between;margin-bottom:22px;gap:16px;flex-wrap:wrap}
.libhead h2{font-size:36px;font-weight:900;letter-spacing:-.02em}
.count{font-family:var(--mono);color:var(--muted);font-size:14px}
.filters{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:26px;align-items:center}
.chip{border-radius:var(--pill);border:1px solid var(--line);background:#fff;color:var(--muted);padding:8px 18px;font-size:13px;font-weight:500;cursor:pointer}
.chip:hover{border-color:var(--ink);color:var(--ink)}
.chip.on{background:var(--ink);color:#fff;border-color:var(--ink)}
.search{margin-left:auto;display:flex;align-items:center;gap:8px;background:#fff;border:1px solid var(--line);border-radius:var(--pill);padding:8px 18px}
.search input{border:none;outline:none;font:inherit;font-size:14px;width:180px;background:transparent;color:var(--ink)}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.gcard{background:#fff;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;transition:.25s;cursor:pointer;text-decoration:none;display:flex;flex-direction:column}
.gcard:hover{border-color:var(--acc-200);box-shadow:0 14px 36px rgba(109,40,217,.12);transform:translateY(-3px)}
.gcover{position:relative;height:170px;background:var(--mist);overflow:hidden;display:block}
.gcover .art{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;filter:grayscale(1);opacity:.5;transition:filter .5s ease,opacity .5s ease}
.gcard:hover .gcover .art{filter:none;opacity:1}
.gbody{padding:16px 18px 18px;text-align:center;flex:1;display:flex;flex-direction:column}
.gbody>.badge{align-self:center}
.gname{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;font-size:15px;font-weight:700;line-height:1.45;letter-spacing:-.01em;margin-bottom:8px;min-height:44px;color:var(--ink);text-align:center}
.gmeta{font-size:12px;color:var(--muted-2);display:flex;gap:10px;flex-wrap:wrap;justify-content:center}
.gextra{margin-top:auto;padding-top:12px;display:flex;align-items:center;justify-content:center;gap:8px;flex-wrap:wrap;font-size:12px;color:var(--muted-2)}
.mk{font-family:var(--mono);font-size:11px;font-weight:700;border:1px solid var(--line);border-radius:var(--pill);padding:1px 9px;color:var(--muted);background:#fff}
.mk-wx{border-color:rgba(15,118,110,.35);color:var(--cat-c);background:var(--cat-c-t)}
.mk-win{border:none;background:transparent;color:var(--acc-600);font-weight:600}
.views{display:flex;gap:6px;margin-left:10px}
.empty{grid-column:1/-1;text-align:center;color:var(--muted-2);padding:48px 0;border:1px dashed var(--line);border-radius:var(--r)}
/* detail */
.dhead{padding:48px 0 24px}
.dhead .crumb{font-size:13px;color:var(--muted-2);margin-bottom:14px;display:flex;gap:8px;align-items:center}
.dhead .crumb a{color:var(--muted);text-decoration:none}
.dhead .crumb a:hover{color:var(--ink)}
.dhead h1{font-size:38px;font-weight:900;letter-spacing:-.02em;line-height:1.25;margin:6px 0 12px}
.dhead .meta{display:flex;gap:10px;flex-wrap:wrap;font-size:13px;color:var(--muted)}
.dlayout{display:grid;grid-template-columns:8fr 4fr;gap:24px;padding-bottom:72px;align-items:start}
.dcard{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:26px;margin-bottom:20px}
.dcard h2{font-size:20px;font-weight:900;letter-spacing:-.01em;margin-bottom:14px}
.dcard h2 .en{font-family:var(--mono);font-size:11px;letter-spacing:.16em;color:var(--muted-2);font-weight:600;margin-left:10px;text-transform:uppercase}
.kv{display:grid;grid-template-columns:110px 1fr;gap:10px 16px;font-size:14px}
.kv dt{color:var(--muted-2)}
.kv dd{color:var(--ink)}
.kv dd div{margin-bottom:2px}
.kv dd a{color:var(--acc-600);text-decoration:none;word-break:break-all}
.kv dd a:hover{text-decoration:underline}
.pending{color:var(--muted-2);font-style:normal}
/* timeline */
.tl{position:relative;padding-left:22px}
.tl:before{content:"";position:absolute;left:6px;top:6px;bottom:6px;width:1px;background:var(--line)}
.tl .item{position:relative;padding-bottom:18px}
.tl .item:last-child{padding-bottom:0}
.tl .item:before{content:"";position:absolute;left:-20px;top:7px;width:9px;height:9px;border-radius:50%;background:var(--line);border:2px solid #fff}
.tl .item.hot:before{background:var(--acc)}
.tl .tst{font-weight:700;font-size:14px}
.tl .win{font-family:var(--mono);font-size:12px;color:var(--acc-600);margin-left:8px}
.tl .note{font-size:12px;color:var(--muted-2)}
.tl .ref{font-family:var(--mono);font-size:11px;color:var(--cat-d);background:rgba(161,98,7,.10);padding:1px 6px;margin-left:8px;vertical-align:1px}
.tlwarn{font-size:13px;color:var(--muted);background:var(--mist);border-left:2px solid var(--acc);padding:10px 12px;margin-bottom:16px}
.tlwarn b{color:var(--ink)}
/* tables (rewards) */
.tblcard{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:24px;margin-bottom:20px;overflow-x:auto}
.tblcard h3{font-size:17px;font-weight:900;margin-bottom:4px}
.tblcard .cap{font-size:12px;color:var(--muted-2);margin-bottom:14px}
table.tbl{width:100%;border-collapse:collapse;font-size:14px;min-width:520px}
table.tbl th,table.tbl td{padding:10px 12px;text-align:center;border-bottom:1px solid var(--line)}
table.tbl thead th{border-bottom:2px solid var(--ink);font-size:12px;letter-spacing:.08em;color:var(--muted);font-weight:600}
table.tbl tbody tr:last-child td{border-bottom:none}
table.tbl td.lv{font-weight:700;text-align:left;white-space:nowrap}
table.tbl td.num{font-family:var(--mono)}
table.tbl td.na{color:var(--muted-2)}
table.tbl td.hit{outline:2px solid var(--acc);outline-offset:-2px;border-radius:6px;background:var(--acc-50)}
.rules li{margin-bottom:10px;font-size:14px;color:var(--muted)}
.rules{list-style:none}
.rules li:before{content:"—";color:var(--acc-600);margin-right:8px}
/* awards */
.agrid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-bottom:40px}
.acard{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:22px;display:flex;flex-direction:column;gap:10px;text-decoration:none;transition:.25s}
.acard:hover{border-color:var(--acc-200);box-shadow:0 14px 36px rgba(109,40,217,.12);transform:translateY(-3px)}
.acard .badge{align-self:flex-start;margin-bottom:0}
/* 名称固定预留两行，保证三张卡片的统计行同一水平线 */
.aname{font-size:16px;font-weight:700;line-height:1.45;color:var(--ink);letter-spacing:-.01em;min-height:2.9em}
.astats{font-size:13px;color:var(--muted)}
.astats .mono{color:var(--ink);font-weight:700}
.ago{margin-top:auto;font-size:13px;color:var(--acc-600);font-weight:600}
.sumchips{display:flex;gap:8px;flex-wrap:wrap;margin:0 0 18px}
@media (max-width:1023px){.agrid{grid-template-columns:1fr 1fr}}
@media (max-width:600px){.agrid{grid-template-columns:1fr}}
/* policy */
.pcard{display:flex;align-items:center;justify-content:space-between;gap:18px;background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:22px 24px;margin-bottom:16px;flex-wrap:wrap}
.pcard .t{font-weight:700;font-size:16px}
.pcard .d{font-size:13px;color:var(--muted-2);margin-top:4px}
.pcard .acts{display:flex;gap:10px}
.cls{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.cls .c{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:20px}
.cls .c .b{margin-bottom:10px}
.cls .c p{font-size:14px;color:var(--muted)}
/* about / prose */
.prose{max-width:760px;padding-bottom:72px}
.prose h2{font-size:22px;font-weight:900;margin:28px 0 10px}
.prose p,.prose li{color:var(--muted);font-size:15px;margin-bottom:10px}
.prose ul{padding-left:20px}
/* footer */
footer{border-top:1px solid var(--line);padding:52px 0 30px;background:#fff}
.fcols{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;margin-bottom:40px}
.fcols .about{color:var(--muted);font-size:14px;max-width:320px;margin-top:10px}
.fcols h4{font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted-2);margin-bottom:14px;font-weight:600}
.fcols a{display:block;color:var(--muted);text-decoration:none;font-size:14px;margin-bottom:10px}
.fcols a:hover{color:var(--ink)}
.fbot{border-top:1px solid var(--line);padding-top:22px;text-align:center;color:var(--muted-2);font-size:13px}
/* responsive */
@media (max-width:1023px){
  .grid{grid-template-columns:1fr 1fr}
  .dlayout{grid-template-columns:1fr}
  .cls{grid-template-columns:1fr}
}
@media (max-width:900px){
  .hero h1{font-size:40px}
  .cols{grid-template-columns:1fr}
  .fcols{grid-template-columns:1fr 1fr}
  .navlinks a:not(.on){display:none}
  .stage{height:420px}
  .card{width:220px;height:340px;margin-left:-110px}
  .ccover{height:160px}
  .search{margin-left:0;width:100%}
  .search input{width:100%}
}
@media (max-width:600px){
  .grid{grid-template-columns:1fr}
  .hero h1{font-size:32px}
  .phead h1,.dhead h1{font-size:30px}
  .dark h2{font-size:28px}
  .out{font-size:60px}
  .kv{grid-template-columns:1fr}
}
@media (prefers-reduced-motion:reduce){
  .card,.ccover .art,.gcover .art{transition:none}
  html{scroll-behavior:auto}
}