:root{
  --bg:#06000f;
  --bg2:#0a0014;
  --ink:#d8e8ff;
  --ink-dim:#7e90b5;
  --grid:#161033;
  --neon:#00ffd0;
  --neon2:#ff00a8;
  --neon3:#ffea00;
  --warn:#ff5577;
  --ok:#00ffd0;
  --partial:#ffaa33;
  --border:rgba(0,255,208,.22);
  --border-strong:rgba(0,255,208,.55);
  --shadow:0 0 30px rgba(0,255,208,.15), inset 0 0 30px rgba(255,0,168,.05);
}

*{box-sizing:border-box;margin:0;padding:0}
html,body{background:var(--bg);color:var(--ink);font-family:'JetBrains Mono','Noto Sans SC',monospace;font-weight:400;line-height:1.6;overflow-x:hidden;-webkit-font-smoothing:antialiased}
html{scroll-behavior:smooth}
a{color:var(--neon);text-decoration:none}
a:hover{text-decoration:underline;text-shadow:0 0 12px var(--neon)}

/* fixed background canvas */
#bgCanvas{position:fixed;inset:0;width:100%;height:100%;z-index:-3;display:block}
.scanlines{position:fixed;inset:0;z-index:-1;pointer-events:none;background:repeating-linear-gradient(to bottom,transparent 0,transparent 2px,rgba(0,255,208,.025) 3px,transparent 4px);mix-blend-mode:overlay;animation:flicker 6s infinite}
.vignette{position:fixed;inset:0;z-index:-2;pointer-events:none;background:radial-gradient(ellipse at center,transparent 35%,rgba(0,0,0,.85) 100%)}
@keyframes flicker{0%,97%,100%{opacity:1}97.5%{opacity:.85}98%{opacity:1}98.5%{opacity:.7}}

/* topbar */
.topbar{position:sticky;top:0;z-index:50;display:flex;align-items:center;justify-content:space-between;padding:14px 24px;background:linear-gradient(180deg,rgba(6,0,15,.92),rgba(6,0,15,.55));backdrop-filter:blur(8px);border-bottom:1px solid var(--border)}
.brand{display:flex;align-items:center;gap:10px;font-family:'Orbitron',sans-serif;font-weight:800;letter-spacing:.18em;font-size:13px}
.brand-glyph{color:var(--neon);text-shadow:0 0 12px var(--neon)}
.brand-text{color:var(--ink)}
.nav{display:flex;gap:18px;font-size:12px;letter-spacing:.1em}
.nav a{color:var(--ink-dim);transition:color .2s, text-shadow .2s}
.nav a:hover{color:var(--neon)}
.lang-toggle{display:flex;border:1px solid var(--border-strong);border-radius:2px;overflow:hidden}
.lang-btn{background:transparent;color:var(--ink-dim);border:0;padding:6px 12px;font-family:inherit;font-size:11px;letter-spacing:.12em;cursor:pointer;transition:all .2s}
.lang-btn.active{background:var(--neon);color:#000;text-shadow:none;font-weight:700}
.lang-btn:hover:not(.active){color:var(--neon)}

/* hero */
.hero{position:relative;min-height:88vh;display:flex;align-items:center;justify-content:center;padding:80px 24px;overflow:hidden}
.hero-grid{position:absolute;inset:0;background-image:linear-gradient(rgba(0,255,208,.07) 1px,transparent 1px),linear-gradient(90deg,rgba(0,255,208,.07) 1px,transparent 1px);background-size:60px 60px;mask-image:radial-gradient(ellipse at center,black 30%,transparent 75%);transform:perspective(800px) rotateX(50deg) translateY(20%) scale(2);animation:grid-pan 20s linear infinite}
@keyframes grid-pan{0%{background-position:0 0}100%{background-position:60px 60px}}
.hero-inner{position:relative;max-width:1100px;width:100%;text-align:center}
.kicker{display:inline-flex;align-items:center;gap:10px;padding:6px 16px;border:1px solid var(--border-strong);border-radius:2px;font-size:11px;letter-spacing:.2em;color:var(--neon);background:rgba(0,255,208,.05);margin-bottom:32px}
.kicker .dot{width:8px;height:8px;background:var(--neon);border-radius:50%;box-shadow:0 0 12px var(--neon);animation:pulse 1.6s ease-in-out infinite}
@keyframes pulse{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.5;transform:scale(.85)}}

.title{font-family:'Orbitron',sans-serif;font-weight:900;font-size:clamp(2.4rem,7vw,5.8rem);line-height:1.05;letter-spacing:-.01em;margin-bottom:24px}
.title-line{display:block}
.title-en .g{color:var(--ink);text-shadow:0 0 30px rgba(216,232,255,.3)}
.title-en .y{color:var(--neon);text-shadow:0 0 24px var(--neon),0 0 60px rgba(0,255,208,.4)}
.title-zh{font-family:'Noto Sans SC',sans-serif;font-size:.55em;color:var(--neon2);letter-spacing:.3em;text-shadow:0 0 18px var(--neon2);margin-top:8px}
[data-lang="en"] .title-zh{display:none}
[data-lang="zh"] .title-en{display:none}
[data-lang="zh"] .title-zh{font-size:1em}
[data-lang="zh"] .title{font-family:'Noto Sans SC',sans-serif}

.subtitle{font-size:clamp(1rem,1.6vw,1.25rem);color:var(--ink);max-width:760px;margin:0 auto 16px;font-weight:300}
.byline{font-size:.85rem;color:var(--ink-dim);max-width:640px;margin:0 auto 36px}
.byline strong{color:var(--ink)}
.cta{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-bottom:48px}
.btn{display:inline-block;padding:13px 28px;font-family:inherit;font-size:13px;letter-spacing:.16em;font-weight:600;border:1px solid var(--border-strong);background:transparent;color:var(--neon);cursor:pointer;transition:all .25s;text-transform:uppercase}
.btn.primary{background:var(--neon);color:#000;border-color:var(--neon);box-shadow:0 0 24px rgba(0,255,208,.4)}
.btn.primary:hover{background:transparent;color:var(--neon);text-decoration:none;box-shadow:0 0 32px rgba(0,255,208,.7)}
.btn.ghost:hover{background:rgba(0,255,208,.08);text-decoration:none}

.hero-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;max-width:760px;margin:0 auto;border-top:1px solid var(--border);padding-top:32px}
.hero-stats > div{display:flex;flex-direction:column;align-items:center;gap:4px}
.hero-stats .num{font-family:'Orbitron',sans-serif;font-size:2rem;font-weight:700;color:var(--neon);text-shadow:0 0 16px rgba(0,255,208,.5)}
.hero-stats .lbl{font-size:11px;letter-spacing:.18em;color:var(--ink-dim);text-transform:uppercase}

/* sections */
.section{max-width:1180px;margin:0 auto;padding:80px 24px;position:relative}
.section-h{font-family:'Orbitron',sans-serif;font-size:clamp(1.4rem,2.6vw,2rem);font-weight:700;color:var(--ink);margin-bottom:32px;letter-spacing:.04em;border-bottom:1px solid var(--border);padding-bottom:16px}
.section-h span{color:var(--neon);text-shadow:0 0 14px var(--neon)}
.lede{color:var(--ink-dim);font-size:1.02rem;max-width:820px;margin-bottom:36px}

.grid{display:grid;gap:24px}
.grid.two{grid-template-columns:repeat(2,1fr)}
@media (max-width:760px){.grid.two{grid-template-columns:1fr}}

.card{background:linear-gradient(135deg,rgba(0,255,208,.04),rgba(255,0,168,.025));border:1px solid var(--border);padding:28px;position:relative;transition:all .3s;overflow:hidden}
.card::before{content:'';position:absolute;top:0;left:0;width:100%;height:1px;background:linear-gradient(90deg,transparent,var(--neon),transparent);opacity:.5}
.card:hover{border-color:var(--border-strong);transform:translateY(-2px);box-shadow:var(--shadow)}
.card h3{font-family:'Orbitron',sans-serif;color:var(--neon);font-size:1.05rem;letter-spacing:.06em;margin-bottom:14px}
.card p{margin-bottom:12px;color:var(--ink)}
.card p:last-child{margin-bottom:0}
.card em{color:var(--neon3);font-style:normal}
.card strong{color:var(--ink);font-weight:700}
.micro{font-size:.85rem;color:var(--ink-dim)}

/* stack diagram */
.stack-diagram{max-width:680px;margin:32px auto;display:flex;flex-direction:column;gap:6px}
.layer{position:relative;padding:22px 28px;display:flex;justify-content:space-between;align-items:center;border:1px solid var(--border-strong);font-family:'Orbitron',sans-serif;letter-spacing:.1em;font-size:.95rem;font-weight:600;background:linear-gradient(90deg,rgba(0,255,208,.08),rgba(0,255,208,.02));transition:all .3s;cursor:default}
.layer:hover{transform:translateX(8px);background:linear-gradient(90deg,rgba(0,255,208,.18),rgba(0,255,208,.04));box-shadow:-4px 0 20px rgba(0,255,208,.3)}
.layer .num{font-size:.75em;color:var(--ink-dim)}
.layer.l4{border-left:4px solid var(--partial)}
.layer.l3{border-left:4px solid var(--warn)}
.layer.l2{border-left:4px solid var(--neon)}
.layer.l1{border-left:4px solid var(--neon3)}
.bedrock{margin-top:12px;padding:14px 28px;text-align:center;font-size:.78rem;letter-spacing:.18em;color:var(--ink-dim);border-top:1px dashed var(--border);text-transform:uppercase}

/* layer cards */
.layer-cards{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
@media (max-width:900px){.layer-cards{grid-template-columns:1fr}}
.lcard{position:relative;border:1px solid var(--border);padding:28px;background:rgba(10,0,20,.5);overflow:hidden;transition:all .35s}
.lcard::after{content:attr(data-layer);position:absolute;right:-10px;bottom:-30px;font-family:'Orbitron',sans-serif;font-size:160px;font-weight:900;color:rgba(0,255,208,.04);pointer-events:none;line-height:1}
.lcard:hover{border-color:var(--border-strong);box-shadow:var(--shadow)}
.lcard:hover::after{color:rgba(0,255,208,.08)}
.lcard-head{display:flex;align-items:baseline;gap:14px;margin-bottom:18px;flex-wrap:wrap}
.lcard-tag{font-family:'Orbitron',sans-serif;font-size:.8rem;color:var(--neon);background:rgba(0,255,208,.1);padding:4px 10px;border:1px solid var(--border-strong);letter-spacing:.16em}
.lcard h3{font-family:'Orbitron',sans-serif;font-size:1.15rem;color:var(--ink);letter-spacing:.04em}
.lcard p{margin-bottom:12px;font-size:.95rem;position:relative;z-index:1}
.lcard p strong{color:var(--neon3)}
.lcard p em{color:var(--neon2);font-style:normal}
.ko{list-style:none;margin:14px 0;font-size:.92rem;display:flex;flex-direction:column;gap:6px}
.ko li{display:flex;gap:10px;align-items:flex-start;color:var(--ink)}
.ko .x{color:var(--warn);font-weight:700}
.ko .m{color:var(--partial);font-weight:700}
.status{display:inline-block;margin-top:14px;padding:5px 12px;font-size:.72rem;letter-spacing:.18em;text-transform:uppercase;border:1px solid;font-weight:600}
.status.ok{color:var(--ok);border-color:var(--ok)}
.status.warn{color:var(--warn);border-color:var(--warn)}
.status.partial{color:var(--partial);border-color:var(--partial)}

/* dialogue log */
.dlog{list-style:none;display:flex;flex-direction:column;gap:14px;counter-reset:d}
.dlog li{counter-increment:d;display:grid;grid-template-columns:80px 1fr;gap:18px;padding:18px 22px;border-left:2px solid var(--border-strong);background:rgba(10,0,20,.45);position:relative;transition:all .25s}
.dlog li::before{content:counter(d,decimal-leading-zero);position:absolute;right:14px;top:14px;font-family:'Orbitron',sans-serif;font-size:.7rem;color:var(--ink-dim);letter-spacing:.18em}
.dlog li:hover{border-left-color:var(--neon);background:rgba(0,255,208,.05);transform:translateX(4px)}
.dlog .who{font-family:'Orbitron',sans-serif;font-size:.78rem;color:var(--neon);letter-spacing:.1em;align-self:start;padding-top:2px}
.dlog em{color:var(--neon3);font-style:normal}

/* forward */
.forward{list-style:none;display:flex;flex-direction:column;gap:18px}
.forward li{padding:20px 24px;border:1px solid var(--border);background:rgba(10,0,20,.4);position:relative;padding-left:48px}
.forward li::before{content:'▸';position:absolute;left:18px;top:18px;color:var(--neon);font-size:1.1rem}
.forward li strong{color:var(--neon)}

/* meta + foot */
.meta p{color:var(--ink-dim);max-width:820px;margin-bottom:14px}
.meta a{color:var(--neon)}
.share{display:flex;gap:10px;flex-wrap:wrap;margin-top:14px}
footer{margin-top:60px;padding:30px 24px;border-top:1px solid var(--border);text-align:center;font-size:.8rem;color:var(--ink-dim);letter-spacing:.06em}
.foot .sep{margin:0 12px;opacity:.5}

@media (max-width:760px){
  .nav{display:none}
  .topbar{padding:12px 16px}
  .hero{padding:60px 16px;min-height:auto}
  .hero-stats{grid-template-columns:repeat(2,1fr)}
  .section{padding:60px 16px}
  .dlog li{grid-template-columns:1fr;gap:6px}
  .dlog li::before{display:none}
}

/* transient highlight */
.flash-line{animation:flash-in .8s ease-out}
@keyframes flash-in{0%{opacity:0;transform:translateY(8px)}100%{opacity:1;transform:translateY(0)}}