:root{
  --bg:#05070f; --bg2:#0a0f1f;
  --cyan:#38f0ff; --magenta:#ff3df0; --violet:#8a7bff;
  --ink:#eaf6ff; --muted:#8fa6c4; --line:rgba(56,240,255,.22);
  --glass:rgba(12,22,40,.55);
  /* San Francisco (Apple system font), with sane fallbacks per platform */
  --font:-apple-system,BlinkMacSystemFont,"SF Pro Display","SF Pro Text","Helvetica Neue","Segoe UI",Arial,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{
  background:
    radial-gradient(1200px 700px at 50% -15%, rgba(56,240,255,.10), transparent 60%),
    radial-gradient(900px 600px at 85% 110%, rgba(255,61,240,.10), transparent 60%),
    linear-gradient(180deg,var(--bg),var(--bg2));
  color:var(--ink);
  font-family:var(--font),"PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  overflow:hidden; letter-spacing:.01em;
}
#bg{position:fixed;inset:0;z-index:0;display:block}
#earth3d{position:fixed;inset:0;z-index:0;display:block;pointer-events:none}
.scanlines{position:fixed;inset:0;z-index:1;pointer-events:none;
  background:repeating-linear-gradient(180deg,rgba(255,255,255,.025) 0 1px,transparent 1px 3px);
  mix-blend-mode:overlay;animation:scan 8s linear infinite;opacity:.5}
@keyframes scan{from{background-position:0 0}to{background-position:0 120px}}
.grid-floor{position:fixed;left:-20%;right:-20%;bottom:-10%;height:45%;z-index:1;pointer-events:none;opacity:.35;
  background-image:linear-gradient(rgba(56,240,255,.35) 1px,transparent 1px),linear-gradient(90deg,rgba(56,240,255,.35) 1px,transparent 1px);
  background-size:48px 48px;transform:perspective(420px) rotateX(70deg);transform-origin:bottom;
  mask-image:linear-gradient(transparent,#000 70%);-webkit-mask-image:linear-gradient(transparent,#000 70%)}
.vignette{position:fixed;inset:0;z-index:1;pointer-events:none;box-shadow:inset 0 0 220px rgba(0,0,0,.85)}

/* ---- warp reaction: HUD layers surge on every forward jump ---- */
body.warp .grid-floor{animation:floorRush .68s cubic-bezier(.2,.7,.2,1)}
@keyframes floorRush{from{background-position:0 0}to{background-position:0 320px}}
body.warp .vignette{animation:warpFlash .68s ease-out}
@keyframes warpFlash{
  0%{box-shadow:inset 0 0 220px rgba(0,0,0,.85), inset 0 0 150px rgba(56,240,255,.32)}
  100%{box-shadow:inset 0 0 220px rgba(0,0,0,.85), inset 0 0 0 rgba(56,240,255,0)}
}
body.warp .scanlines{animation-duration:.32s}

.hud{position:fixed;width:34px;height:34px;z-index:6;border:2px solid var(--cyan);opacity:.7}
.hud-tl{top:12px;left:12px;border-right:0;border-bottom:0}
.hud-tr{top:12px;right:12px;border-left:0;border-bottom:0}
.hud-bl{bottom:12px;left:12px;border-right:0;border-top:0}
.hud-br{bottom:12px;right:12px;border-left:0;border-top:0}

#topbar{position:fixed;top:0;left:0;right:0;z-index:6;display:flex;align-items:center;gap:10px;
  padding:14px 54px;font-family:var(--font);font-size:11px;letter-spacing:.18em;color:var(--cyan);
  text-transform:uppercase;background:linear-gradient(180deg,rgba(5,7,15,.85),transparent)}
#topbar i{color:var(--muted);font-style:normal}
#topbar .sig{color:var(--magenta)}
#topbar .sig b{color:#5fffa0}
#topbar .spacer{flex:1}
#topbar .clk{color:var(--muted)}

/* Boot */
#boot{position:fixed;inset:0;z-index:30;background:radial-gradient(circle at 50% 50%,#08111f,#03040a);
  display:flex;align-items:center;justify-content:center;transition:opacity .6s ease}
#boot.gone{opacity:0;pointer-events:none}
.boot-inner{text-align:center;font-family:var(--font);color:var(--cyan)}
.boot-logo{font-size:42px;font-weight:700;letter-spacing:.1em;
  text-shadow:0 0 24px var(--cyan);animation:pulse 1.6s ease-in-out infinite}
.boot-line{margin-top:18px;font-size:13px;letter-spacing:.25em;color:var(--muted);min-height:18px}
.boot-bar{width:280px;height:4px;margin:16px auto 0;background:rgba(56,240,255,.15);border-radius:4px;overflow:hidden}
.boot-bar-fill{height:100%;width:0;background:linear-gradient(90deg,var(--cyan),var(--magenta));box-shadow:0 0 12px var(--cyan)}
.boot-hint{margin-top:14px;font-size:10px;letter-spacing:.2em;color:rgba(143,166,196,.6)}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.55}}

/* Progress */
#progress{position:fixed;top:0;left:0;right:0;height:3px;z-index:7;background:transparent}
#progress-bar{height:100%;width:16%;background:linear-gradient(90deg,var(--cyan),var(--magenta));
  box-shadow:0 0 12px var(--cyan);transition:width .4s cubic-bezier(.2,.8,.2,1)}

/* Deck */
#deck{position:relative;z-index:4;height:100vh;width:100vw}
.slide{position:absolute;inset:0;display:flex;flex-direction:column;justify-content:center;
  padding:11vh 11vw 9vh;opacity:0;visibility:hidden;pointer-events:none;
  will-change:transform,opacity,filter}
.slide.active{opacity:1;visibility:visible;pointer-events:auto}
/* warp-through transitions: old page rushes past you, new page flies in from far away */
.slide.leave{animation:flyOut .58s cubic-bezier(.4,.65,.2,1) forwards}
.slide.enter{animation:flyIn .78s cubic-bezier(.18,.75,.2,1) forwards}
@keyframes flyOut{
  from{transform:scale(1);opacity:1;filter:blur(0)}
  to{transform:scale(1.85);opacity:0;filter:blur(14px)}
}
@keyframes flyIn{
  from{transform:scale(.58);opacity:0;filter:blur(20px)}
  to{transform:scale(1);opacity:1;filter:none}
}
.slide-idx{position:absolute;top:64px;right:60px;font-family:var(--font);font-size:13px;
  letter-spacing:.2em;color:var(--muted)}

.kicker{font-family:var(--font);letter-spacing:.28em;text-transform:uppercase;
  color:var(--cyan);font-size:12px;margin-bottom:16px;
  text-shadow:0 0 14px rgba(56,240,255,.5)}
h1{font-family:var(--font);font-weight:700;font-size:clamp(40px,7.5vw,92px);line-height:.98;
  letter-spacing:-.01em;text-shadow:0 0 40px rgba(56,240,255,.25)}
h2{font-family:var(--font);font-weight:700;font-size:clamp(26px,4.6vw,56px);
  margin-bottom:26px;letter-spacing:.01em;text-shadow:0 0 30px rgba(138,123,255,.25)}
.sub{color:var(--muted);font-size:clamp(16px,2vw,22px);margin-top:20px;letter-spacing:.04em}
.thesis{margin-top:36px;max-width:760px;font-size:clamp(17px,2.3vw,25px);color:#dff3ff;
  padding:18px 22px;border-radius:14px;border:1px solid var(--line);
  background:var(--glass);backdrop-filter:blur(8px);box-shadow:0 0 40px rgba(56,240,255,.08) inset}
.thesis b{color:var(--cyan)}

/* Glitch */
.glitch{position:relative}
.glitch::before,.glitch::after{content:attr(data-text);position:absolute;left:0;top:0;width:100%;
  white-space:pre;clip-path:inset(0);opacity:.85}
.glitch::before{color:var(--magenta);transform:translate(2px,0);animation:gl1 3.4s infinite linear alternate}
.glitch::after{color:var(--cyan);transform:translate(-2px,0);animation:gl2 2.8s infinite linear alternate}
@keyframes gl1{0%{clip-path:inset(0 0 82% 0)}25%{clip-path:inset(55% 0 30% 0)}50%{clip-path:inset(20% 0 60% 0)}75%{clip-path:inset(70% 0 10% 0)}100%{clip-path:inset(40% 0 45% 0)}}
@keyframes gl2{0%{clip-path:inset(60% 0 20% 0)}25%{clip-path:inset(10% 0 75% 0)}50%{clip-path:inset(45% 0 35% 0)}75%{clip-path:inset(25% 0 55% 0)}100%{clip-path:inset(5% 0 80% 0)}}

/* Orbit */
.orbit{position:absolute;top:8vh;right:9vw;width:clamp(200px,26vw,360px);height:clamp(200px,26vw,360px);
  border:1px solid rgba(56,240,255,.25);border-radius:50%;box-shadow:0 0 60px rgba(56,240,255,.1) inset;
  animation:spin 18s linear infinite}
.orbit::before{content:"";position:absolute;inset:14%;border:1px dashed rgba(255,61,240,.3);border-radius:50%}
.orbit .planet{position:absolute;top:-6px;left:50%;width:14px;height:14px;margin-left:-7px;border-radius:50%;
  background:radial-gradient(circle at 30% 30%,#fff,var(--cyan));box-shadow:0 0 22px var(--cyan)}
@keyframes spin{to{transform:rotate(360deg)}}

/* Video */
.video-wrap{position:relative;width:min(900px,80vw);aspect-ratio:16/9;background:#000;
  border-radius:14px;overflow:hidden}
.neon-frame{border:1px solid var(--cyan);box-shadow:0 0 30px rgba(56,240,255,.25),0 0 60px rgba(56,240,255,.1) inset}
.video-wrap video{width:100%;height:100%;display:block;object-fit:contain;background:#000}
.feed-tag{position:absolute;top:10px;left:12px;z-index:3;font-family:var(--font);font-size:11px;
  letter-spacing:.18em;color:#ff6b6b;text-shadow:0 0 10px #ff6b6b}
#video-fallback{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;
  text-align:center;padding:20px;font-family:var(--font)}
#video-fallback code{background:#0c1020;padding:2px 8px;border-radius:6px;color:var(--cyan)}

.watch-for{list-style:none;display:flex;gap:18px;flex-wrap:wrap;margin-top:24px}
.watch-for li{flex:1;min-width:200px;background:var(--glass);border:1px solid var(--line);border-radius:12px;
  padding:14px 16px;font-size:clamp(14px,1.7vw,19px);color:#dbeeff;backdrop-filter:blur(6px)}
.wf-k{display:block;font-family:var(--font);font-size:12px;letter-spacing:.2em;color:var(--cyan);margin-bottom:6px}

/* Bullets */
.bullets{list-style:none;display:flex;flex-direction:column;gap:18px;font-size:clamp(18px,2.6vw,30px);max-width:900px}
.bullets li{padding-left:34px;position:relative;color:#e3f3ff}
.bullets li::before{content:"▹";position:absolute;left:0;top:0;color:var(--cyan);
  text-shadow:0 0 12px var(--cyan);font-size:1.1em;animation:blink 2.4s infinite}
@keyframes blink{0%,100%{opacity:1}50%{opacity:.4}}

.tag-row{display:flex;flex-wrap:wrap;gap:9px;margin-top:30px}
.tag{background:rgba(56,240,255,.08);color:var(--cyan);border:1px solid var(--line);
  border-radius:999px;padding:6px 15px;font-size:13px;letter-spacing:.05em;
  font-family:var(--font);box-shadow:0 0 14px rgba(56,240,255,.08)}

/* Contrast table */
table.contrast{width:min(840px,86vw);border-collapse:separate;border-spacing:0;margin-top:6px;
  font-family:var(--font)}
table.contrast th,table.contrast td{border:1px solid var(--line);padding:16px 20px;text-align:center;font-size:clamp(15px,2.1vw,24px)}
table.contrast th{background:rgba(56,240,255,.08);color:var(--cyan);letter-spacing:.1em;font-weight:700}
table.contrast td:first-child{color:var(--muted)}
table.contrast td.hl{color:#fff;background:rgba(255,61,240,.10);text-shadow:0 0 14px var(--magenta);
  box-shadow:0 0 22px rgba(255,61,240,.18) inset;font-weight:700}

/* Stamp */
.stamp{margin-top:30px;display:inline-block;font-family:var(--font);font-weight:700;
  font-size:clamp(22px,3.2vw,40px);line-height:1.05;letter-spacing:.02em;
  color:transparent;-webkit-text-stroke:1.5px var(--cyan);text-shadow:0 0 30px rgba(56,240,255,.3);
  transform:rotate(-2deg);border:2px solid var(--cyan);padding:14px 22px;border-radius:10px;
  background:rgba(56,240,255,.04)}

/* Animations on activate */
.slide.active [data-anim]{animation:rise .8s cubic-bezier(.2,.8,.2,1) both}
.slide.active .kicker{animation-delay:.05s}
.slide.active h1,.slide.active h2{animation-delay:.12s}
.slide.active .sub{animation-delay:.22s}
.slide.active .thesis,.slide.active .bullets,.slide.active .watch-for,
.slide.active .tag-row,.slide.active table.contrast,.slide.active .stamp{animation-delay:.3s}
@keyframes rise{from{opacity:0;transform:translateY(28px);filter:blur(8px)}to{opacity:1;transform:none;filter:none}}

/* Controls — scroll driven; arrows removed on purpose */
#counter{position:fixed;bottom:18px;right:24px;z-index:8;font-family:var(--font);
  font-size:13px;letter-spacing:.2em;color:var(--cyan)}
/* Story act caption — the stage of the story you are in */
#act{position:fixed;top:52px;left:60px;z-index:7;max-width:38vw;
  padding:10px 16px;border-left:2px solid var(--cyan);
  background:linear-gradient(90deg,rgba(10,18,34,.72),rgba(10,18,34,0));
  font-family:var(--font);}
#act .act-no{display:block;font-size:12px;font-weight:700;letter-spacing:.22em;
  color:var(--cyan);text-shadow:0 0 14px rgba(56,240,255,.5)}
#act .act-line{display:block;margin-top:5px;font-size:13.5px;line-height:1.45;color:#bcd2ea}
#act.flip{animation:actFlip .6s cubic-bezier(.2,.8,.2,1)}
@keyframes actFlip{
  from{opacity:0;transform:translateX(-14px);filter:blur(6px)}
  to{opacity:1;transform:none;filter:none}
}

#scroll-hint{position:fixed;bottom:54px;left:50%;transform:translateX(-50%);z-index:8;
  display:flex;align-items:center;gap:9px;font-family:var(--font);font-size:11px;
  letter-spacing:.2em;color:var(--muted);animation:hintPulse 2.2s ease-in-out infinite}
#scroll-hint .wheel{font-size:16px;color:var(--cyan);text-shadow:0 0 12px var(--cyan);
  animation:wheelDrop 1.8s ease-in-out infinite}
#scroll-hint.gone{opacity:0;transition:opacity .5s}
@keyframes hintPulse{0%,100%{opacity:.9}50%{opacity:.4}}
@keyframes wheelDrop{0%,100%{transform:translateY(0)}50%{transform:translateY(6px)}}
.mini-btn{position:fixed;bottom:18px;left:24px;z-index:8;background:rgba(10,18,34,.6);border:1px solid var(--line);
  color:var(--muted);padding:8px 14px;border-radius:999px;font-family:var(--font);font-size:11px;
  letter-spacing:.15em;cursor:pointer;backdrop-filter:blur(6px);transition:.2s}
.mini-btn:hover{color:var(--cyan);border-color:var(--cyan)}

#notes{position:fixed;top:0;right:0;width:min(420px,92vw);height:100vh;z-index:20;padding:24px;
  background:rgba(6,10,20,.95);border-left:1px solid var(--line);overflow-y:auto;
  box-shadow:-12px 0 50px rgba(0,0,0,.6);backdrop-filter:blur(10px)}
.notes-head{display:flex;justify-content:space-between;align-items:center;color:var(--cyan);
  font-family:var(--font);letter-spacing:.12em;margin-bottom:16px}
#notes-close{cursor:pointer;color:var(--muted);font-size:18px}
#notes-body{color:#dbeeff;font-size:16px;line-height:1.8;white-space:pre-wrap}
.hidden{display:none!important}

#offline-flag{position:fixed;bottom:18px;left:50%;transform:translateX(-50%);z-index:8;
  font-family:var(--font);font-size:11px;letter-spacing:.15em;color:var(--magenta);
  border:1px solid var(--magenta);padding:5px 14px;border-radius:999px;
  background:rgba(255,61,240,.08);box-shadow:0 0 18px rgba(255,61,240,.2)}

@media (max-width:680px){
  .slide{padding:13vh 8vw 12vh}
  #topbar{padding:12px 44px;font-size:9px;gap:6px}
  .orbit{opacity:.5;top:auto;bottom:14vh;right:6vw}
  #scroll-hint{bottom:44px;font-size:10px}
  #act{top:46px;left:22px;max-width:74vw;padding:8px 12px}
  #act .act-line{display:none}
}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.001s!important;animation-iteration-count:1!important}
}