/* BOS303 — 节点链 hero（层级节点+衰减光） + Rantai Pesan 传话链卡. 墨蓝黑 #11141B × 冰蓝 #6BD9FF */
:root{
  --bg:#11141B;--panel:#171C25;--panel2:#1F2632;--text:#EAF2F8;--muted:#9DAFC0;
  --accent:#6BD9FF;--accent-deep:#2C7FA8;--ice:#A8E4FF;--gold:#F0D089;--ink:#0A0D12;
  --glow:0 0 12px rgba(107,217,255,.4),0 0 26px rgba(107,217,255,.2);
  --grad-panel:linear-gradient(150deg,#1F2632 0%,#11141B 100%);
  --font-h:'Mate',serif;--font-b:'Pragati Narrow',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(--accent);text-decoration:none}
a:hover{text-decoration:underline}
b,strong{letter-spacing:.01em}
.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(17,20,27,.92);backdrop-filter:blur(10px);border-bottom:1px solid rgba(107,217,255,.32)}
.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:400;font-size:1.6rem;color:var(--text);white-space:nowrap;line-height:1;letter-spacing:.04em}
.brand:hover{text-decoration:none}
.nav-desktop{display:none;margin-left:auto;gap:18px}
.nav-desktop a{color:var(--muted);font-weight:600;font-size:.95rem}
.nav-desktop a:hover{color:var(--accent);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,#6BD9FF,#2C7FA8);color:#0A0D12;box-shadow:var(--glow)}
.btn-secondary{background:transparent;color:var(--accent);border-color:rgba(107,217,255,.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(107,217,255,.4)}50%{box-shadow:0 0 22px rgba(107,217,255,.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(--accent);border-radius:2px}
.m-nav{display:none;background:var(--panel);border-bottom:1px solid rgba(107,217,255,.28)}
.m-nav-group{padding:10px 16px}
.m-nav-group h3{font-size:.8rem;text-transform:uppercase;letter-spacing:.08em;color:var(--accent);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}
/* 节点链 hero（层级节点+衰减光） */
.rantai-hero{padding:44px 0 6px;background:radial-gradient(60% 70% at 50% 0%,rgba(107,217,255,.10) 0%,rgba(17,20,27,0) 70%)}
.rantai-head{text-align:center}
.rantai-head h1{font-family:var(--font-h);font-weight:400;font-size:clamp(2.6rem,7.5vw,4.2rem);letter-spacing:.05em;text-shadow:0 2px 0 #1B2A36,0 0 26px rgba(107,217,255,.45)}
.hero-sub{max-width:680px;margin:12px auto 20px;color:var(--muted)}
.hero-cta{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.rantai-stage{position:relative;height:300px;max-width:620px;margin:26px auto 0;overflow:hidden;border-radius:16px;border:1px solid rgba(107,217,255,.28);
  background:radial-gradient(120% 90% at 78% 10%,rgba(31,38,50,.92),rgba(17,20,27,0) 56%),linear-gradient(180deg,#1A2029 0%,#11141B 58%,#0C0F15 100%)}
.rantai-stage::before{content:"";position:absolute;inset:0;background-image:
  radial-gradient(1.4px 1.4px at 18% 26%,rgba(234,242,248,.5),transparent),
  radial-gradient(1.2px 1.2px at 34% 12%,rgba(234,242,248,.32),transparent),
  radial-gradient(1.6px 1.6px at 62% 18%,rgba(234,242,248,.42),transparent),
  radial-gradient(1.2px 1.2px at 48% 34%,rgba(234,242,248,.24),transparent),
  radial-gradient(1.4px 1.4px at 84% 32%,rgba(234,242,248,.34),transparent),
  radial-gradient(1.2px 1.2px at 8% 58%,rgba(234,242,248,.28),transparent),
  radial-gradient(1.3px 1.3px at 92% 62%,rgba(234,242,248,.3),transparent)}
.rantai-glow{position:absolute;left:50%;top:46%;width:430px;height:270px;margin:-135px 0 0 -215px;border-radius:50%;
  background:radial-gradient(52% 52% at 50% 50%,rgba(107,217,255,.22) 0%,rgba(107,217,255,.07) 58%,rgba(17,20,27,0) 100%);
  animation:rantai-glow 4.5s ease-in-out infinite;z-index:0}
@keyframes rantai-glow{0%,100%{opacity:1}50%{opacity:.66}}
.rantai-line{position:absolute;left:9%;right:9%;top:46%;height:2px;z-index:1;
  background:linear-gradient(90deg,rgba(107,217,255,.95) 0%,rgba(107,217,255,.6) 38%,rgba(107,217,255,.3) 68%,rgba(107,217,255,.08) 100%)}
.rantai-pulse{position:absolute;top:46%;left:9%;width:12px;height:12px;margin-top:-5px;border-radius:50%;background:var(--ice);
  box-shadow:0 0 10px rgba(107,217,255,.9),0 0 22px rgba(107,217,255,.5);
  animation:rantai-travel 3.4s cubic-bezier(.4,0,.6,1) infinite;z-index:5}
@keyframes rantai-travel{0%{left:9%;opacity:0}6%{opacity:.95}55%{opacity:.65}88%{opacity:.18}100%{left:91%;opacity:0}}
.rnode{position:absolute;top:46%;transform:translate(-50%,-50%);display:flex;flex-direction:column;align-items:center;gap:7px;z-index:2}
.rnode-c{display:flex;align-items:center;justify-content:center;border-radius:50%;background:var(--ink);font-weight:700;font-family:var(--font-b)}
.rnode-t{font-size:.6rem;letter-spacing:.12em;font-weight:700;color:var(--muted)}
.rnode-1{left:9%}
.rnode-2{left:29.5%}
.rnode-3{left:50%;opacity:.86}
.rnode-4{left:70.5%;opacity:.72}
.rnode-5{left:91%;opacity:.62}
.rnode-1 .rnode-c{width:72px;height:72px;font-size:1.5rem;color:var(--ink);background:linear-gradient(135deg,#A8E4FF,#6BD9FF);border:2px solid rgba(168,228,255,.9);
  box-shadow:0 0 18px rgba(107,217,255,.75),0 0 40px rgba(107,217,255,.35);animation:rnode-breathe 2.6s ease-in-out infinite}
@keyframes rnode-breathe{0%,100%{box-shadow:0 0 18px rgba(107,217,255,.75),0 0 40px rgba(107,217,255,.35)}50%{box-shadow:0 0 26px rgba(107,217,255,.95),0 0 56px rgba(107,217,255,.5)}}
.rnode-2 .rnode-c{width:62px;height:62px;font-size:1.15rem;color:var(--accent);border:2px solid rgba(107,217,255,.72);box-shadow:0 0 14px rgba(107,217,255,.45),0 0 30px rgba(107,217,255,.2)}
.rnode-3 .rnode-c{width:54px;height:54px;font-size:1.05rem;color:var(--accent);border:2px solid rgba(107,217,255,.58);box-shadow:0 0 10px rgba(107,217,255,.3)}
.rnode-4 .rnode-c{width:47px;height:47px;font-size:.95rem;color:var(--accent);border:2px solid rgba(107,217,255,.45)}
.rnode-5 .rnode-c{width:42px;height:42px;font-size:1rem;color:var(--gold);border:2px dashed rgba(240,208,137,.65)}
.rkutip{position:absolute;font-size:.78rem;line-height:1.5;color:var(--muted);background:rgba(10,13,18,.74);border:1px solid rgba(107,217,255,.32);
  padding:4px 12px;border-radius:12px;max-width:44%;z-index:6}
.rkutip-asli{left:4%;top:6%;color:var(--text);border-color:rgba(107,217,255,.5)}
.rkutip-sampai{right:4%;bottom:11%;border-style:dashed;font-style:italic}
.stage-chips{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin:16px 0 4px}
.chip{font-size:.78rem;letter-spacing:.06em;color:var(--accent);border:1px solid rgba(107,217,255,.4);border-radius:99px;padding:3px 14px;background:rgba(17,20,27,.6)}
.chip-warm{color:#F7E7C3;border-color:#6B5A33}
.section{padding:38px 0}
.section-alt{background:rgba(23,28,37,.55)}
.sec-title{font-family:var(--font-h);font-weight:400;font-size:1.9rem;margin-bottom:18px;text-align:center}
.sec-sub{color:var(--muted);text-align:center;max-width:700px;margin:-8px auto 18px;font-size:.92rem}
.grid-2,.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(107,217,255,.32);border-radius:14px;padding:18px;color:var(--text);transition:border-color .15s,box-shadow .15s}
.glow-card:hover{border-color:var(--accent);box-shadow:var(--glow);text-decoration:none}
.glow-card h3{font-size:1.05rem;margin-bottom:6px;color:var(--accent)}
.glow-card p{color:var(--muted);font-size:.92rem}
.nc-icon{font-size:1.5rem;display:block;margin-bottom:8px}
/* Rantai Pesan 传话链卡（特色板块） */
.rantai-grid{display:grid;gap:14px;grid-template-columns:1fr;margin-bottom:8px}
.rantai-card{background:var(--grad-panel);border:1px solid rgba(107,217,255,.32);border-radius:14px;overflow:hidden}
.rantai-bar{display:flex;align-items:center;gap:8px;padding:8px 14px;font-size:.7rem;letter-spacing:.16em;font-weight:700;color:var(--accent);background:rgba(10,13,18,.72);border-bottom:1px solid rgba(107,217,255,.22)}
.rantai-dot{width:8px;height:8px;border-radius:50%;background:var(--gold);flex:0 0 auto;animation:rantai-blink 1.2s steps(1) infinite}
@keyframes rantai-blink{50%{opacity:.25}}
.rantai-card h3{font-size:1.08rem;font-weight:700;color:var(--accent);padding:12px 16px 2px;line-height:1.4}
.rantai-card p{padding:0 16px;color:var(--muted);font-size:.9rem;margin:6px 0 8px}
.rantai-card .rantai-read{border-left:3px solid var(--accent);border-radius:0 8px 8px 0;background:rgba(107,217,255,.07);color:var(--text);font-size:.86rem;padding:8px 12px;margin:4px 16px 14px}
.rantai-read strong{color:var(--accent)}
.trust-zone p{max-width:640px;margin:10px auto;color:var(--muted)}
.trust-zone .pill-18{margin:6px 0 12px}
.prose .note{color:var(--muted);font-size:.9rem}
.page-head{padding-top:22px}
.page-head h1,.prose h1{font-family:var(--font-h);font-weight:400;font-size:clamp(1.9rem,5vw,2.9rem);line-height:1.25}
.prose h2{font-family:var(--font-h);font-weight:400;font-size:clamp(1.5rem,4vw,1.9rem);margin:26px 0 10px;line-height:1.3}
.prose h3{font-size:1.08rem;font-weight:700;margin:20px 0 8px;color:var(--accent)}
.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(--accent)}
.edu-fig{margin:18px 0}
.edu-fig img{width:100%;height:auto;border-radius:12px;border:1px solid rgba(107,217,255,.32);box-shadow:0 0 18px rgba(107,217,255,.14)}
.edu-fig figcaption{font-size:.85rem;color:var(--muted);margin-top:8px;text-align:center}
.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:#0C0F15;border:1px solid rgba(107,217,255,.4);border-radius:8px;padding:10px 12px;color:var(--text);font-family:var(--font-b)}
.quick-form input:focus{outline:none;border-color:var(--accent)}
.kamus-grid{display:grid;gap:10px;margin:14px 0}
.kamus-item{background:var(--grad-panel);border:1px solid rgba(107,217,255,.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(--accent)}
.kamus-item[open] summary::after{content:"−"}
.kamus-item p{padding:0 16px 14px;color:var(--muted);font-size:.95rem}
.flow{margin:16px 0;padding:20px;display:block}
.flow>*{border-radius:10px;padding:11px 14px;margin-bottom:9px;font-size:.95rem;background:rgba(17,20,27,.55);border:1px solid rgba(107,217,255,.32)}
.flow-step strong{color:var(--accent)}
.flow-end{border:1px dashed rgba(107,217,255,.5);color:var(--muted)}
.err-wrap{padding:70px 16px}
.err-code{font-family:var(--font-h);font-size:5rem;color:var(--accent);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(--accent)}
.site-footer{background:var(--panel);border-top:1px solid rgba(107,217,255,.32);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(--accent);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(--accent);text-decoration:none}
.pill-18{display:inline-block;border:1px solid var(--accent);color:var(--accent);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(107,217,255,.22);color:var(--muted);font-size:.85rem}
.float-cta{position:fixed;left:0;right:0;bottom:0;z-index:60;padding:10px 16px calc(10px + env(safe-area-inset-bottom));background:rgba(17,20,27,.92);backdrop-filter:blur(8px);border-top:1px solid rgba(107,217,255,.38)}
@media (max-width:767px){
  .header-in{gap:8px}
  .brand{font-size:1.38rem}
  .brand .logo-mark{width:26px;height:26px}
  .header-cta{gap:6px}
  .header-cta .btn{padding:8px 13px;font-size:.85rem}
  .burger{padding:5px}
  .rantai-stage{height:252px}
  .rkutip{font-size:.66rem;padding:3px 9px;max-width:46%}
  .rnode-1 .rnode-c{width:58px;height:58px;font-size:1.2rem}
  .rnode-2 .rnode-c{width:50px;height:50px;font-size:1rem}
  .rnode-3 .rnode-c{width:44px;height:44px;font-size:.9rem}
  .rnode-4 .rnode-c{width:38px;height:38px;font-size:.85rem}
  .rnode-5 .rnode-c{width:34px;height:34px;font-size:.9rem}
  .rnode-t{font-size:.52rem;letter-spacing:.08em}
  .rantai-glow{width:330px;height:210px;margin:-105px 0 0 -165px}
}
@media (min-width:768px){
  .grid-2{grid-template-columns:repeat(2,1fr)}
  .grid-3{grid-template-columns:repeat(3,1fr)}
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .rantai-grid{grid-template-columns:repeat(3,1fr)}
  .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}
  .float-cta{left:auto;right:18px;bottom:18px;border-radius:12px;border:1px solid rgba(107,217,255,.48)}
  .float-cta .btn-block{width:auto}
}
@media (min-width:1024px){.grid-4{grid-template-columns:repeat(4,1fr)}.rantai-grid{grid-template-columns:repeat(5,1fr)}.rantai-card p{font-size:.84rem}}
@media (prefers-reduced-motion:reduce){.pulse,.rantai-pulse,.rantai-glow,.rnode-1 .rnode-c,.rantai-dot{animation:none}}

/* ===== Float CTA Jackpot v2 (2026-09-17): 底部居中 + 闪烁 ===== */
.float-cta{left:50%;right:auto;transform:translateX(-50%);width:100%;max-width:600px;margin:0;display:block}
.float-inner{display:flex;align-items:center;justify-content:center;gap:12px;flex-wrap:wrap}
.jackpot-tag{display:inline-flex;align-items:center;gap:6px;font-weight:800;font-size:1rem;letter-spacing:.02em;color:#FFE066;text-shadow:0 0 10px rgba(255,224,102,.6)}
.jackpot-blink{animation:jackpot-blink 1.1s ease-in-out infinite}
@keyframes jackpot-blink{0%,100%{opacity:1;text-shadow:0 0 10px rgba(255,224,102,.85),0 0 22px rgba(255,224,102,.45)}50%{opacity:.5;text-shadow:0 0 4px rgba(255,224,102,.3)}}
.masuk-btn{position:relative;overflow:hidden;white-space:nowrap;flex:0 0 auto;font-weight:800;letter-spacing:.02em;animation:masuk-glow 1.4s ease-in-out infinite}
.masuk-btn::after{content:"";position:absolute;top:0;left:-80%;width:55%;height:100%;background:linear-gradient(105deg,rgba(255,255,255,0) 0%,rgba(255,255,255,.55) 50%,rgba(255,255,255,0) 100%);transform:skewX(-20deg);animation:masuk-shine 1.8s linear infinite}
@keyframes masuk-shine{0%{left:-80%}55%,100%{left:130%}}
@keyframes masuk-glow{0%,100%{box-shadow:0 0 8px rgba(107,217,255,.55)}50%{box-shadow:0 0 24px rgba(107,217,255,.95),0 0 40px rgba(44,127,168,.5)}}
.jp-spark{display:inline-block;animation:spark-twinkle 1s ease-in-out infinite}
@keyframes spark-twinkle{0%,100%{transform:scale(1);opacity:1}50%{transform:scale(.55) rotate(18deg);opacity:.45}}
@media (prefers-reduced-motion:reduce){.jackpot-blink,.masuk-btn,.masuk-btn::after,.jp-spark{animation:none}}