/* ARENA333 — 竞技场环 arena-ring hero + 卡片流. 赛场蓝黑 #0A1526 × 天青 #38BDF8 */
:root{
  --bg:#0A1526;--panel:#0F1F38;--panel2:#142846;--text:#EAF2FF;--muted:#8FA8C9;
  --neon:#38BDF8;--glow:0 0 12px rgba(56,189,248,.4),0 0 26px rgba(56,189,248,.2);
  --grad-panel:linear-gradient(150deg,#142846 0%,#0A1526 100%);
  --font-h:'Teko',sans-serif;--font-b:'Lora',serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--text);font-family:var(--font-b);line-height:1.7;font-size:16px}
img,svg{max-width:100%;vertical-align:middle}
a{color:var(--neon);text-decoration:none}
a:hover{text-decoration:underline}
.container{width:100%;max-width:1160px;margin:0 auto;padding:0 16px}
.container.narrow{max-width:840px}
.center{text-align:center}
.site-header{position:sticky;top:0;z-index:50;background:rgba(10,21,38,.92);backdrop-filter:blur(10px);border-bottom:1px solid rgba(56,189,248,.35)}
.header-in{display:flex;align-items:center;gap:14px;min-height:60px}
.brand{display:inline-flex;align-items:center;gap:8px;font-family:var(--font-h);font-weight:600;font-size:1.5rem;letter-spacing:.04em;color:var(--text);white-space:nowrap}
.brand:hover{text-decoration:none}
.nav-desktop{display:none;margin-left:auto;gap:18px}
.nav-desktop a{color:var(--muted);font-weight:500;font-size:.95rem}
.nav-desktop a:hover{color:var(--neon);text-decoration:none}
.header-cta{display:flex;gap:8px;margin-left:auto}
.nav-desktop+.header-cta{margin-left:0}
.btn{display:inline-block;padding:10px 20px;border-radius:10px;font-family:var(--font-h);font-weight:600;font-size:1rem;letter-spacing:.05em;cursor:pointer;border:1px solid transparent;transition:transform .15s}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn-primary{background:linear-gradient(135deg,#38BDF8,#0EA5E9);color:#0A1526;box-shadow:var(--glow)}
.btn-secondary{background:transparent;color:var(--neon);border-color:rgba(56,189,248,.55)}
.btn-block{display:block;width:100%;text-align:center}
.pulse{animation:pulse-glow 2s infinite}
@keyframes pulse-glow{0%,100%{box-shadow:0 0 8px rgba(56,189,248,.4)}50%{box-shadow:0 0 22px rgba(56,189,248,.8)}}
.nav-toggle{display:none}
.burger{display:flex;flex-direction:column;gap:4px;cursor:pointer;padding:6px;margin-left:4px}
.burger span{width:22px;height:2px;background:var(--neon);border-radius:2px}
.m-nav{display:none;background:var(--panel);border-bottom:1px solid rgba(56,189,248,.3)}
.m-nav-group{padding:10px 16px}
.m-nav-group h3{font-family:var(--font-h);font-size:.95rem;letter-spacing:.1em;text-transform:uppercase;color:var(--neon);margin-bottom:6px;font-weight:600}
.m-nav-group a{display:block;padding:6px 0;color:var(--text)}
.nav-toggle:checked~.m-nav{display:block}
/* arena-ring hero */
.arena-hero{padding:48px 0 8px}
.arena-ring{position:relative;display:flex;align-items:center;justify-content:center;min-height:400px;padding:40px 16px}
.ring{position:absolute;top:50%;left:50%;border-radius:50%;border:1px solid rgba(56,189,248,.45);transform:translate(-50%,-50%)}
.ring.r1{width:min(88vw,560px);height:min(88vw,560px);border-style:dashed;animation:spin 60s linear infinite}
.ring.r2{width:min(64vw,400px);height:min(64vw,400px);border-width:2px;border-color:rgba(56,189,248,.7);box-shadow:0 0 24px rgba(56,189,248,.25),inset 0 0 24px rgba(56,189,248,.15);animation:spin 40s linear infinite reverse}
@keyframes spin{to{transform:translate(-50%,-50%) rotate(360deg)}}
.arena-core{position:relative;z-index:2;text-align:center;max-width:560px;background:rgba(15,31,56,.75);border:1px solid rgba(56,189,248,.5);border-radius:18px;padding:34px 22px;box-shadow:var(--glow)}
.arena-core h1{font-family:var(--font-h);font-size:clamp(2.8rem,9vw,4.6rem);letter-spacing:.06em;line-height:1;color:var(--neon);text-shadow:0 0 18px rgba(56,189,248,.5)}
.hero-sub{margin:12px auto 20px;color:var(--muted);max-width:460px}
.hero-cta{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.arena-side{position:absolute;top:50%;transform:translateY(-50%);display:none;flex-direction:column;gap:12px;z-index:1}
.side-l{left:-8px}.side-r{right:-8px}
.tag-round{font-family:var(--font-h);font-size:.9rem;letter-spacing:.12em;color:#0A1526;background:linear-gradient(135deg,#38BDF8,#7DD3FC);border-radius:8px;padding:4px 10px;box-shadow:0 0 10px rgba(56,189,248,.4);transform:rotate(-4deg)}
.side-r .tag-round{transform:rotate(4deg)}
.section{padding:38px 0}
.section-alt{background:rgba(15,31,56,.55)}
.sec-title{font-family:var(--font-h);font-size:1.9rem;letter-spacing:.04em;margin-bottom:8px;text-align:center}
.sec-sub{color:var(--muted);text-align:center;margin-bottom:18px}
.grid-3,.grid-4{display:grid;gap:16px;grid-template-columns:1fr;margin-bottom:8px}
.glow-card{display:block;background:var(--grad-panel);border:1px solid rgba(56,189,248,.35);border-radius:14px;padding:18px;color:var(--text);transition:border-color .15s,box-shadow .15s}
.glow-card:hover{border-color:var(--neon);box-shadow:var(--glow);text-decoration:none}
.glow-card h3{font-family:var(--font-h);font-size:1.25rem;letter-spacing:.03em;margin-bottom:6px;color:var(--neon)}
.glow-card p{color:var(--muted);font-size:.92rem}
.nc-icon{font-size:1.5rem;display:block;margin-bottom:8px}
/* rule chain 特色板块 */
.rule-chain{display:grid;gap:12px;counter-reset:rule}
.rule-step{position:relative;background:var(--grad-panel);border:1px solid rgba(56,189,248,.4);border-radius:14px;padding:16px 16px 14px 64px}
.rule-num{position:absolute;left:14px;top:16px;width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-family:var(--font-h);font-size:1.2rem;color:#0A1526;background:linear-gradient(135deg,#38BDF8,#7DD3FC);box-shadow:0 0 10px rgba(56,189,248,.45)}
.rule-step h3{font-family:var(--font-h);font-size:1.25rem;letter-spacing:.03em;color:var(--neon);margin-bottom:4px}
.rule-step p{color:var(--muted);font-size:.92rem}
.rule-step::after{content:"";position:absolute;left:31px;bottom:-13px;width:2px;height:12px;background:rgba(56,189,248,.55)}
.rule-step:last-child::after{display:none}
/* prose */
.flow{margin:16px 0;padding:20px;display:block}
.flow>*{border-radius:10px;padding:11px 14px;margin-bottom:9px;font-size:.95rem;background:rgba(10,21,38,.55);border:1px solid rgba(56,189,248,.35)}
.flow-step strong{color:var(--neon)}
.flow-end{border:1px dashed rgba(56,189,248,.5);color:var(--muted)}
.prose .note{color:var(--muted);font-size:.9rem}
.page-head{padding-top:22px}
.page-head h1,.prose h1{font-family:var(--font-h);font-size:clamp(1.8rem,5vw,2.6rem);letter-spacing:.03em}
.prose h2{font-family:var(--font-h);font-size:1.6rem;letter-spacing:.03em;margin:26px 0 10px}
.prose h3{font-family:var(--font-h);font-size:1.3rem;letter-spacing:.03em;margin:20px 0 8px;color:var(--neon)}
.prose p{margin:0 0 14px}
.prose ul,.prose ol{margin:0 0 14px 22px}
.prose li{margin-bottom:6px}
.steps li{margin-bottom:10px}
.steps li strong{color:var(--neon)}
.quick-form{display:grid;gap:8px;max-width:360px;margin:12px 0}
.quick-form label{font-size:.85rem;color:var(--muted)}
.quick-form input{background:#0A1526;border:1px solid rgba(56,189,248,.4);border-radius:8px;padding:10px 12px;color:var(--text);font-family:var(--font-b)}
.quick-form input:focus{outline:none;border-color:var(--neon)}
.kamus-grid{display:grid;gap:10px;margin:14px 0}
.kamus-item{background:var(--grad-panel);border:1px solid rgba(56,189,248,.3);border-radius:10px;overflow:hidden}
.kamus-item summary{cursor:pointer;padding:13px 16px;font-weight:600;list-style:none;position:relative}
.kamus-item summary::-webkit-details-marker{display:none}
.kamus-item summary::after{content:"+";position:absolute;right:16px;color:var(--neon)}
.kamus-item[open] summary::after{content:"−"}
.kamus-item p{padding:0 16px 14px;color:var(--muted);font-size:.95rem}
.err-wrap{padding:70px 16px}
.err-code{font-family:var(--font-h);font-size:5.5rem;color:var(--neon);text-shadow:var(--glow);line-height:1}
.err-wrap .btn{margin:18px 0}
.crumbs{padding:12px 0 0;font-size:.82rem;color:var(--muted)}
.crumbs ol{list-style:none;display:flex;flex-wrap:wrap;gap:6px}
.crumbs li+li::before{content:"›";margin-right:6px;color:var(--neon)}
.site-footer{background:var(--panel);border-top:1px solid rgba(56,189,248,.35);padding:36px 0 92px;margin-top:30px}
.foot-grid{display:grid;gap:24px;grid-template-columns:1fr}
.foot-brand p{color:var(--muted);font-size:.9rem;margin:10px 0}
.foot-col h3{font-family:var(--font-h);font-size:1.05rem;letter-spacing:.1em;text-transform:uppercase;color:var(--neon);margin-bottom:8px;font-weight:600}
.foot-col a{display:block;color:var(--muted);padding:3px 0;font-size:.92rem}
.foot-col a:hover{color:var(--neon);text-decoration:none}
.pill-18{display:inline-block;border:1px solid var(--neon);color:var(--neon);border-radius:999px;padding:2px 12px;font-weight:600;font-size:.85rem}
.foot-bottom{margin-top:24px;padding-top:16px;border-top:1px solid rgba(56,189,248,.25);color:var(--muted);font-size:.85rem}
.float-cta{position:fixed;left:50%;transform:translateX(-50%);bottom:calc(12px + env(safe-area-inset-bottom));z-index:60;display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:10px 14px;padding:10px 16px;max-width:calc(100vw - 24px);background:rgba(10,21,38,.94);backdrop-filter:blur(8px);border:1px solid rgba(56,189,248,.55);border-radius:14px;box-shadow:0 8px 28px rgba(0,0,0,.55)}
.float-text{color:#7DD3FC;font-weight:600;font-size:.95rem;white-space:nowrap;text-shadow:0 0 10px rgba(56,189,248,.45)}
.float-cta .btn{animation:cta-blink 1.6s ease-in-out infinite;white-space:nowrap;flex-shrink:0}
@keyframes cta-blink{0%,100%{box-shadow:0 0 8px rgba(56,189,248,.55);transform:scale(1)}50%{box-shadow:0 0 18px rgba(56,189,248,.95),0 0 36px rgba(56,189,248,.5);transform:scale(1.04)}}
@media (min-width:768px){
  .grid-3{grid-template-columns:repeat(3,1fr)}
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .arena-side{display:flex}
  .rule-chain{grid-template-columns:repeat(5,1fr)}
  .rule-step{padding:16px 12px 14px;text-align:center}
  .rule-num{position:static;margin:0 auto 10px}
  .rule-step::after{left:auto;top:26px;right:-13px;width:12px;height:2px}
  .rule-step:last-child::after{display:none}
  .foot-grid{grid-template-columns:2fr 1fr 1fr 1fr}
  .nav-desktop{display:flex}
  .header-cta{margin-left:0}
  .burger{display:none}
  .m-nav{display:none!important}
}
@media (min-width:1024px){.grid-4{grid-template-columns:repeat(4,1fr)}}
@media (max-width:479px){
  .header-in{gap:8px}
  .header-cta .btn{padding:8px 12px;font-size:.9rem}
  .burger{padding:4px;margin-left:0}
}
@media (prefers-reduced-motion:reduce){.pulse,.ring{animation:none}.float-cta .btn{animation:none}}