@import url('https://fonts.googleapis.com/css2?family=Fraunces:ital,opsz,wght@0,9..144,300..900;1,9..144,300..900&family=Space+Grotesk:wght@300..700&display=swap');

:root{
  --sorrel:#C8502E;
  --amber:#F2B705;
  --moss:#4E9B6A;
  --ink:#120B06;
  --paper:#FFF9EE;
  --glass:rgba(255,249,238,.08);
  --glass-brd:rgba(255,249,238,.22);
  --shadow:0 24px 80px rgba(0,0,0,.55);
  --r:22px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
html,body{max-width:100vw;overflow-x:clip}
body{
  margin:0;color:var(--paper);
  font-family:"Space Grotesk",system-ui,sans-serif;
  background:
    radial-gradient(1100px 700px at 12% -5%, rgba(200,80,46,.55), transparent 60%),
    radial-gradient(900px 700px at 88% 12%, rgba(242,183,5,.38), transparent 60%),
    radial-gradient(1000px 900px at 50% 110%, rgba(78,155,106,.42), transparent 62%),
    var(--ink);
  background-attachment:fixed;
  min-height:100vh;
  overflow-x:hidden;
}
::selection{background:var(--amber);color:var(--ink)}

/* scroll progress */
.scroll-progress{position:fixed;top:0;left:0;height:4px;width:100%;z-index:60;
  transform-origin:0 50%;transform:scaleX(0);
  background:linear-gradient(90deg,var(--sorrel),var(--amber),var(--moss));}

/* nav */
.nav{position:sticky;top:12px;z-index:50;display:flex;align-items:center;gap:16px;
  max-width:1060px;margin:12px auto 0;padding:10px 18px;border-radius:999px}
.brand{display:flex;align-items:center;gap:10px;color:var(--paper);text-decoration:none;
  font-family:Fraunces,serif;font-weight:700;font-size:19px;letter-spacing:.2px}
.brand-mark{display:grid;place-items:center;width:34px;height:34px;border-radius:50%;
  background:linear-gradient(135deg,var(--amber),var(--sorrel));color:var(--ink);font-size:19px;
  box-shadow:0 0 22px rgba(242,183,5,.55)}
.nav-links{display:flex;gap:4px;margin-left:auto}
.nav-links a{color:var(--paper);opacity:.8;text-decoration:none;font-size:14px;padding:8px 12px;border-radius:999px}
.nav-links a:hover{opacity:1;background:rgba(255,249,238,.12)}
.stratum{font-size:12px;letter-spacing:.14em;text-transform:uppercase;opacity:.75;
  border:1px solid var(--glass-brd);padding:7px 12px;border-radius:999px;white-space:nowrap;
  overflow:hidden;text-overflow:ellipsis;max-width:44vw;flex:none}

/* glass */
.glass{background:var(--glass);border:1px solid var(--glass-brd);border-radius:var(--r);
  -webkit-backdrop-filter:blur(18px) saturate(1.4);backdrop-filter:blur(18px) saturate(1.4);
  box-shadow:var(--shadow), inset 0 1px 0 rgba(255,255,255,.25);}

/* hero */
.hero{max-width:1060px;margin:26px auto 0;padding:0 18px;position:relative}
.hero-inner{padding:clamp(28px,5vw,64px);position:relative;overflow:hidden}
.hero-inner::before{content:"⬡";position:absolute;right:-30px;top:-70px;font-size:300px;line-height:1;
  color:transparent;-webkit-text-stroke:2px rgba(242,183,5,.28);transform:rotate(12deg);pointer-events:none}
.kicker{font-size:12px;letter-spacing:.22em;text-transform:uppercase;color:var(--amber);margin:0 0 12px;overflow-wrap:break-word}
h1{font-family:Fraunces,serif;font-weight:600;font-size:clamp(40px,7vw,76px);line-height:1.02;margin:0 0 14px}
h1 em{font-style:italic;background:linear-gradient(100deg,var(--amber),var(--sorrel));
  -webkit-background-clip:text;background-clip:text;color:transparent}
.lede{max-width:56ch;font-size:clamp(15px,2.4vw,18px);opacity:.88;margin:0 0 22px}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap}
.hero-cta .btn{flex:1 1 220px;text-align:center}
.hero-stats{display:flex;gap:26px;margin-top:26px;flex-wrap:wrap}
.hero-stats div{display:flex;flex-direction:column}
.hero-stats strong{font-family:Fraunces,serif;font-size:30px;color:var(--amber)}
.hero-stats span{font-size:12px;letter-spacing:.12em;text-transform:uppercase;opacity:.7}
.scroll-hint{display:flex;align-items:center;gap:10px;justify-content:center;margin:18px 0 4px;
  font-size:12px;letter-spacing:.3em;text-transform:uppercase;opacity:.65}
.scroll-hint span{width:22px;height:36px;border:2px solid var(--glass-brd);border-radius:12px;position:relative}
.scroll-hint span::after{content:"";position:absolute;left:50%;top:6px;width:4px;height:8px;margin-left:-2px;
  border-radius:4px;background:var(--amber);animation:drop 1.6s ease-in-out infinite}
@keyframes drop{0%{transform:translateY(0);opacity:1}70%{transform:translateY(12px);opacity:0}100%{opacity:0}}

/* sticky stage */
.sticky-wrap{max-width:1060px;margin:0 auto;padding:0 18px}
.stage{position:sticky;top:76px;display:grid;grid-template-columns:1.5fr 1fr;gap:0;margin:14px 0 26px;overflow:hidden}
.canvas-holder{position:relative;min-height:520px}
canvas#spireCanvas{position:absolute;inset:0;width:100%;height:100%;display:block;cursor:crosshair;touch-action:manipulation}
.hud{position:absolute;top:12px;left:12px;display:flex;gap:8px;flex-wrap:wrap;pointer-events:none}
.hud-chip{font-size:12px;letter-spacing:.06em;background:rgba(18,11,6,.55);border:1px solid var(--glass-brd);
  padding:6px 11px;border-radius:999px;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}
.hud-chip b{color:var(--amber)}
.lay-hint{position:absolute;bottom:12px;left:50%;transform:translateX(-50%);border:1px solid var(--glass-brd);
  background:rgba(18,11,6,.55);color:var(--paper);border-radius:999px;padding:8px 16px;font-size:13px;
  cursor:pointer;white-space:nowrap;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}
.lay-hint:hover{border-color:var(--amber);color:var(--amber)}

.panel{padding:26px 24px;border-left:1px solid var(--glass-brd);background:rgba(18,11,6,.28)}
.panel h2{font-family:Fraunces,serif;font-size:28px;margin:0 0 6px}
.panel h2::after{content:"";display:block;width:52px;height:4px;border-radius:4px;margin-top:8px;
  background:linear-gradient(90deg,var(--sorrel),var(--amber))}
.panel-sub{font-size:14px;opacity:.8;margin:0 0 16px}
.btn-row{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:12px}
.btn{appearance:none;border:1px solid var(--glass-brd);background:rgba(255,249,238,.1);color:var(--paper);
  border-radius:14px;padding:11px 16px;font:inherit;font-size:14px;font-weight:600;cursor:pointer;
  transition:transform .15s ease, box-shadow .15s ease, border-color .15s ease, background .15s ease}
.btn:hover{transform:translateY(-2px);border-color:var(--amber);box-shadow:0 8px 26px rgba(242,183,5,.25)}
.btn:active{transform:translateY(0) scale(.97)}
.btn.primary{background:linear-gradient(135deg,var(--amber),var(--sorrel));color:var(--ink);border:none}
.btn.ghost{background:transparent}
.btn.danger{opacity:.75}
.btn.danger:hover{border-color:var(--sorrel);box-shadow:0 8px 26px rgba(200,80,46,.3)}
.slider{display:block;font-size:13px;letter-spacing:.04em;margin:12px 0;opacity:.95}
.slider output{float:right;color:var(--amber);font-weight:700}
.slider input{width:100%;accent-color:var(--amber);margin-top:6px;cursor:pointer}
.seedline{font-size:13px;opacity:.8}
.seedline code,.readout code{background:rgba(0,0,0,.45);border:1px solid var(--glass-brd);
  padding:2px 8px;border-radius:8px;color:var(--amber);font-size:12px}
.readout{font-size:13px;opacity:.85}

/* chapters — these are the scroll fuel */
.chapter{max-width:1060px;margin:26px auto;padding:clamp(24px,4vw,48px);opacity:.35;transform:translateY(26px) scale(.99);
  transition:opacity .6s ease, transform .6s ease, border-color .6s ease}
.chapter.in{opacity:1;transform:none;border-color:rgba(242,183,5,.5)}
.chapter h2{font-family:Fraunces,serif;font-size:clamp(26px,4vw,42px);margin:0 0 10px;line-height:1.08}
.chapter p{max-width:62ch;opacity:.88}

/* footer */
.foot{max-width:1060px;margin:30px auto 60px;padding:0 22px;opacity:.85;font-size:14px}
.tiny{font-size:12px;letter-spacing:.08em;opacity:.7}
.swatches{display:inline-flex;gap:5px;vertical-align:-2px;margin-left:6px}
.swatches i{width:14px;height:14px;border-radius:50%;border:1px solid rgba(255,255,255,.6)}
.swatches i:nth-child(1){background:var(--sorrel)}
.swatches i:nth-child(2){background:var(--amber)}
.swatches i:nth-child(3){background:var(--moss)}

/* toast */
.toast{position:fixed;bottom:22px;left:50%;transform:translate(-50%,20px);z-index:70;opacity:0;pointer-events:none;
  background:rgba(18,11,6,.85);border:1px solid var(--amber);color:var(--paper);
  padding:12px 20px;border-radius:14px;font-size:14px;transition:opacity .3s, transform .3s;
  -webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);max-width:min(92vw,480px);text-align:center}
.toast.show{opacity:1;transform:translate(-50%,0)}

@media (max-width:820px){
  .stage{grid-template-columns:1fr;top:70px}
  .canvas-holder{min-height:62vh}
  .panel{border-left:none;border-top:1px solid var(--glass-brd)}
  .nav-links{display:none}
  .stratum{margin-left:auto}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .chapter{transition:none;opacity:1;transform:none}
}