/* BUMI303 — 地球弧线 earth-arc hero + 卡片流. 大地青 #143028 × 苔光 #57D9A4 */
:root{
  --bg:#0B1B15;--panel:#143028;--panel2:#1B3D31;--text:#E9F7EE;--muted:#9CC4AF;
  --neon:#57D9A4;--glow:0 0 12px rgba(87,217,164,.4),0 0 26px rgba(87,217,164,.2);
  --grad-panel:linear-gradient(150deg,#1B3D31 0%,#0B1B15 100%);
  --font-h:'Bellota',cursive;--font-b:'Questrial',sans-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(11,27,21,.92);backdrop-filter:blur(10px);border-bottom:1px solid rgba(87,217,164,.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:700;font-size:1.2rem;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:400;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-b);font-weight:700;font-size:.9rem;cursor:pointer;border:1px solid transparent;transition:transform .15s}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn-primary{background:linear-gradient(135deg,#57D9A4,#3CBF8A);color:#0B1B15;box-shadow:var(--glow)}
.btn-secondary{background:transparent;color:var(--neon);border-color:rgba(87,217,164,.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(87,217,164,.4)}50%{box-shadow:0 0 22px rgba(87,217,164,.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(87,217,164,.3)}
.m-nav-group{padding:10px 16px}
.m-nav-group h3{font-size:.8rem;text-transform:uppercase;letter-spacing:.08em;color:var(--neon);margin-bottom:6px;font-weight:700}
.m-nav-group a{display:block;padding:6px 0;color:var(--text)}
.nav-toggle:checked~.m-nav{display:block}
/* earth-arc hero */
.arc-hero{position:relative;padding:56px 0 30px;overflow:hidden}
.arc-bg{position:absolute;inset:0;pointer-events:none}
.arc-bg i{position:absolute;left:50%;bottom:-42vw;transform:translateX(-50%);border-radius:50%;border:1px solid rgba(87,217,164,.5)}
.arc-bg i:nth-child(1){width:110vw;height:110vw;border-width:2px;box-shadow:0 0 40px rgba(87,217,164,.25)}
.arc-bg i:nth-child(2){width:150vw;height:150vw;opacity:.6}
.arc-bg i:nth-child(3){width:190vw;height:190vw;opacity:.3}
.arc-in{position:relative;text-align:center;padding:18px 0 26px}
.arc-in h1{font-family:var(--font-h);font-size:clamp(2.6rem,8vw,4.4rem);letter-spacing:.04em;text-shadow:0 0 30px rgba(87,217,164,.45)}
.hero-sub{max-width:620px;margin:12px auto 20px;color:var(--muted)}
.hero-cta{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.arc-cards{position:relative;padding-top:6px}
.stat-card{text-align:center}
.section{padding:38px 0}
.section-alt{background:rgba(20,48,40,.55)}
.sec-title{font-family:var(--font-h);font-size:1.5rem;margin-bottom:18px;text-align:center}
.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(87,217,164,.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:1.05rem;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}
/* self-check scale (static, zero JS) */
.cek-wrap{display:grid;gap:12px;margin:16px 0}
.cek-row{background:var(--grad-panel);border:1px solid rgba(87,217,164,.3);border-radius:12px;padding:14px 16px}
.cek-q{font-weight:700;margin-bottom:10px}
.cek-opts{display:flex;gap:8px;flex-wrap:wrap}
.opt{font-size:.8rem;border-radius:99px;padding:4px 14px;border:1px solid rgba(87,217,164,.4);color:var(--muted)}
.opt.hit{border-color:#E5896B;color:#F2B4A2}
.opt.mid{border-color:#E5C76B;color:#F2E1A2}
.opt.ok{border-color:#57D9A4;color:#A9F0D2}
/* flow cards */
.flow{margin:16px 0;padding:20px;display:block}
.flow>*{border-radius:10px;padding:11px 14px;margin-bottom:9px;font-size:.95rem;background:rgba(11,27,21,.55);border:1px solid rgba(87,217,164,.35)}
.flow-step strong{color:var(--neon)}
.flow-end{border:1px dashed rgba(87,217,164,.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(1.6rem,4.5vw,2.2rem)}
.prose h2{font-family:var(--font-h);font-size:1.35rem;margin:26px 0 10px}
.prose h3{font-size:1.08rem;font-weight:700;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:#0B1B15;border:1px solid rgba(87,217,164,.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(87,217,164,.3);border-radius:10px;overflow:hidden}
.kamus-item summary{cursor:pointer;padding:13px 16px;font-weight:700;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:50px 16px 70px}
.arc-mini{position:relative;height:70px;margin-bottom:8px}
.arc-mini i{position:absolute;left:50%;bottom:-46px;transform:translateX(-50%);border-radius:50%;border:1px solid rgba(87,217,164,.5)}
.arc-mini i:nth-child(1){width:120px;height:120px}
.arc-mini i:nth-child(2){width:180px;height:180px;opacity:.4}
.err-code{font-family:var(--font-h);font-size:5rem;color:var(--neon);text-shadow:var(--glow)}
.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(87,217,164,.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-size:.85rem;text-transform:uppercase;letter-spacing:.08em;color:var(--neon);margin-bottom:8px;font-weight:700}
.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:700;font-size:.85rem}
.foot-bottom{margin-top:24px;padding-top:16px;border-top:1px solid rgba(87,217,164,.25);color:var(--muted);font-size:.85rem}
.float-cta{position:fixed;left:50%;bottom:calc(12px + env(safe-area-inset-bottom));transform:translateX(-50%);z-index:60;display:flex;align-items:center;justify-content:center;gap:10px;max-width:calc(100vw - 24px);padding:8px 10px;background:rgba(11,27,21,.94);backdrop-filter:blur(8px);border:1px solid rgba(87,217,164,.5);border-radius:14px;box-shadow:0 6px 24px rgba(0,0,0,.45)}
.float-tag{font-family:var(--font-h);font-weight:700;color:var(--neon);font-size:.95rem;white-space:nowrap;text-shadow:0 0 12px rgba(87,217,164,.5)}
.float-cta .btn{white-space:nowrap;animation:cta-blink 1.6s ease-in-out infinite}
@keyframes cta-blink{0%,100%{box-shadow:0 0 8px rgba(87,217,164,.45);transform:scale(1)}50%{box-shadow:0 0 22px rgba(87,217,164,.95),0 0 36px rgba(87,217,164,.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)}
  .foot-grid{grid-template-columns:2fr 1fr 1.4fr 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 (prefers-reduced-motion:reduce){.pulse,.float-cta .btn{animation:none}}