/* ==========================================================================
   The Night Our Universe Began — the sky over Rasht, 22 November 2023
   Mobile-first stylesheet. Portrait iPhone is the design target.
   ========================================================================== */

/* ---------------------------------------------------------------- fonts */
@font-face{font-family:'Cormorant Garamond';src:url('../assets/fonts/cormorant-garamond-300.woff2') format('woff2');font-weight:300;font-style:normal;font-display:swap}
@font-face{font-family:'Cormorant Garamond';src:url('../assets/fonts/cormorant-garamond-400.woff2') format('woff2');font-weight:400;font-style:normal;font-display:swap}
@font-face{font-family:'Cormorant Garamond';src:url('../assets/fonts/cormorant-garamond-500.woff2') format('woff2');font-weight:500;font-style:normal;font-display:swap}
@font-face{font-family:'Cormorant Garamond';src:url('../assets/fonts/cormorant-garamond-300i.woff2') format('woff2');font-weight:300;font-style:italic;font-display:swap}
@font-face{font-family:'Cormorant Garamond';src:url('../assets/fonts/cormorant-garamond-400i.woff2') format('woff2');font-weight:400;font-style:italic;font-display:swap}
@font-face{font-family:'Inter';src:url('../assets/fonts/inter-300.woff2') format('woff2');font-weight:300;font-style:normal;font-display:swap}
@font-face{font-family:'Inter';src:url('../assets/fonts/inter-400.woff2') format('woff2');font-weight:400;font-style:normal;font-display:swap}
@font-face{font-family:'Inter';src:url('../assets/fonts/inter-500.woff2') format('woff2');font-weight:500;font-style:normal;font-display:swap}
/* greek subset so Bayer letters (α, β, …) stay in the same typeface */
@font-face{font-family:'Inter';src:url('../assets/fonts/inter-greek-400.woff2') format('woff2');font-weight:400;font-style:normal;font-display:swap;unicode-range:U+0370-03FF}

/* ---------------------------------------------------------------- tokens */
:root{
  --bg:#0a0e1a;
  --bg-2:#0f1626;
  --ink:#e9ebf2;
  --ink-2:rgba(233,235,242,.66);
  --ink-3:rgba(233,235,242,.42);
  --ink-4:rgba(233,235,242,.25);
  --hairline:rgba(236,238,244,.85);
  --accent:#b9b4d8;
  --silver:#cfd3dc;
  --serif:'Cormorant Garamond',Georgia,'Times New Roman',serif;
  --sans:'Inter',-apple-system,BlinkMacSystemFont,'Helvetica Neue',Arial,sans-serif;
  --safe-t:env(safe-area-inset-top,0px);
  --safe-b:env(safe-area-inset-bottom,0px);
  --ease:cubic-bezier(.22,.61,.36,1);
  /* circle diameter: ~88% of width on a phone; guarded fallback for old Safari */
  --disc:min(88vw,58vh,560px);
}
@supports (height:100svh){
  :root{--disc:min(88vw,58svh,560px)}
}
@media (orientation:landscape){
  :root{--disc:min(88vw,60vh,560px)}
  @supports (height:100svh){
    :root{--disc:min(88vw,60svh,560px)}
  }
}

/* ---------------------------------------------------------------- base */
*,*::before,*::after{box-sizing:border-box}
html{scroll-snap-type:y proximity;overscroll-behavior:none}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--sans);
  overflow-x:hidden;
  overscroll-behavior:none;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  -webkit-text-size-adjust:100%;
  -webkit-tap-highlight-color:transparent;
  touch-action:manipulation;
}
.sr-only{position:absolute;width:1px;height:1px;margin:-1px;padding:0;border:0;clip:rect(0 0 0 0);overflow:hidden;white-space:nowrap}
.noscript{padding:24px;font:400 15px/1.6 var(--sans);color:var(--ink-2);text-align:center}

#stage{
  position:fixed;inset:0;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  padding:calc(var(--safe-t) + 4px) 0 calc(var(--safe-b) + 6px);
}
/* the quiet wash of light behind everything */
#stage::before{
  content:'';position:fixed;inset:0;z-index:0;pointer-events:none;
  background:radial-gradient(130% 100% at 50% 44%,#0a1122 0%,#060a14 55%,#04070e 100%);
  opacity:0;transition:opacity 1.4s ease;
}
body.boot #stage::before{opacity:1}
/* faint film grain (also dithers the dark gradients) */
#stage::after{
  content:'';position:fixed;inset:0;z-index:3;pointer-events:none;
  opacity:.035;background-size:140px 140px;
  background-image:url("data:image/svg+xml,%3Csvg%20xmlns=%27http://www.w3.org/2000/svg%27%20width=%27140%27%20height=%27140%27%3E%3Cfilter%20id=%27n%27%3E%3CfeTurbulence%20type=%27fractalNoise%27%20baseFrequency=%270.85%27%20numOctaves=%272%27%20stitchTiles=%27stitch%27/%3E%3CfeColorMatrix%20type=%27saturate%27%20values=%270%27/%3E%3C/filter%3E%3Crect%20width=%27140%27%20height=%27140%27%20filter=%27url(%23n)%27/%3E%3C/svg%3E");
}

/* the scroll runway: four viewports tall — map, pavilion, night walk, note */
#scroll-space{position:relative;z-index:0;height:400vh;pointer-events:none}
#scroll-space .snap{height:100vh;scroll-snap-align:start}
@supports (height:100svh){
  #scroll-space{height:400svh}
  #scroll-space .snap{height:100svh}
}
#mapview{display:flex;flex-direction:column;align-items:center;will-change:opacity,transform}

/* the middle stages: framed illustrations (the pavilion, then the night walk) */
.plate{
  position:fixed;inset:0;z-index:34;pointer-events:none;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  padding:0 24px;opacity:0;will-change:opacity,transform;
}
.plate img,.plate video{
  max-width:min(90vw,560px);max-height:min(52vh,430px);width:auto;height:auto;display:block;
  border-radius:8px;border:1px solid rgba(236,238,244,.30);
  box-shadow:0 24px 60px rgba(0,0,0,.55),0 0 40px rgba(120,150,215,.06);
}
.plate-cap{
  margin:14px 0 0;text-align:center;
  font:500 9.5px/1.6 var(--sans);letter-spacing:.30em;text-transform:uppercase;color:rgba(233,235,242,.50);
}
.plate-cap:empty{display:none}

/* ------------------------------------------------------------ the chart */
#sky-wrap{
  position:relative;z-index:1;
  width:var(--disc);height:var(--disc);
  border-radius:50%;
  border:1px solid var(--hairline);
  box-shadow:0 26px 70px rgba(0,0,0,.5),0 0 60px rgba(130,150,215,.07);
  opacity:0;transform:scale(.988);
  transition:opacity 1.2s ease,transform 1.8s var(--ease);
}
body.rim #sky-wrap{opacity:1;transform:none}
#sky,#twinkle{
  position:absolute;inset:0;width:100%;height:100%;
  border-radius:50%;display:block;
}
#sky{
  touch-action:pan-y;-webkit-user-select:none;user-select:none;-webkit-touch-callout:none;cursor:crosshair;outline:none;
  background:radial-gradient(circle at 50% 44%,#131f3d 0%,#0e1830 46%,#080f1e 100%);
  box-shadow:inset 0 0 46px rgba(3,6,14,.45);
}
#twinkle{pointer-events:none}
#sky:focus-visible{box-shadow:inset 0 0 46px rgba(3,6,14,.45),0 0 0 2px rgba(185,180,216,.35)}

#cardinals{position:absolute;inset:0;pointer-events:none;opacity:0;transition:opacity 1.4s ease .2s}
body.rim #cardinals{opacity:1}
.c{position:absolute;font:500 9px/1 var(--sans);letter-spacing:.24em;color:var(--ink-4)}
.c-n{top:11px;left:50%;transform:translateX(-50%)}
.c-s{bottom:11px;left:50%;transform:translateX(-50%)}
.c-e{right:11px;top:50%;transform:translateY(-50%)}
.c-w{left:11px;top:50%;transform:translateY(-50%)}

/* -------------------------------------------------------------- caption */
#words{display:flex;flex-direction:column;align-items:center;z-index:1}
#caption{margin-top:clamp(16px,3.2svh,30px);text-align:center;z-index:1}
#caption p{margin:0;opacity:0;transition:opacity 1s ease}
body.cap #caption p{opacity:1}
.cap-1{font:500 11px/1 var(--sans);letter-spacing:.36em;text-transform:uppercase;color:var(--ink-2);transition-delay:.0s}
.cap-2{font:400 9.5px/1 var(--sans);letter-spacing:.32em;text-transform:uppercase;color:var(--ink-3);margin-top:8px !important;transition-delay:.14s}
.cap-3{font:400 8.5px/1 var(--sans);letter-spacing:.26em;color:var(--ink-4);margin-top:7px !important;transition-delay:.28s}

#invite{
  margin:clamp(14px,2.6svh,24px) 0 0;z-index:1;
  font:300 italic 16px/1.35 var(--serif);letter-spacing:.02em;
  color:rgba(233,235,242,.78);opacity:0;transition:opacity 1s ease;
}
body.invite #invite{opacity:1}

/* ----------------------------------------------------------------- dock */
#dock{
  position:fixed;left:50%;bottom:calc(var(--safe-b) + 10px);z-index:30;
  width:min(100% - 28px,520px);
  display:flex;align-items:center;justify-content:space-between;gap:4px;
  padding:0 2px;
  opacity:0;pointer-events:none;
  transform:translateX(-50%) translateY(10px);
  transition:opacity .65s ease,transform .65s var(--ease);
}
#dock.on{opacity:1;pointer-events:auto;transform:translateX(-50%)}
body.note-view #dock{opacity:0 !important;pointer-events:none !important}
body.note-view #sheet{opacity:0 !important;pointer-events:none !important}

.icon-btn{
  width:44px;height:44px;flex:0 0 44px;
  display:grid;place-items:center;padding:0;
  background:none;border:none;border-radius:12px;
  color:var(--ink-3);cursor:pointer;
  transition:color .3s ease,background-color .3s ease;
}
.icon-btn:active{background:rgba(255,255,255,.05)}
.icon-btn:focus-visible{outline:none;box-shadow:0 0 0 2px rgba(185,180,216,.4)}
@media (hover:hover){.icon-btn:hover{color:var(--ink-2)}}
#btn-lines[aria-pressed="false"]{color:var(--ink-4)}
#btn-lines[aria-pressed="true"]{color:var(--silver)}

/* ------------------------------------------------------------- time hint */
#timehint{
  flex:1;text-align:center;pointer-events:none;white-space:nowrap;
  font:500 10px/1 var(--sans);letter-spacing:.22em;color:var(--ink-2);
  opacity:0;transition:opacity .6s ease;
}
#timehint.on{opacity:1}
#timehint sup{font:500 7px/1 var(--sans);letter-spacing:.18em;color:var(--ink-4);margin-left:4px;vertical-align:top;position:relative;top:-1px;transition:opacity .35s ease}

/* ---------------------------------------------------------- scroll hint */
#scrollhint{
  position:fixed;left:50%;bottom:calc(var(--safe-b) + 84px);z-index:28;
  display:flex;flex-direction:column;align-items:center;gap:7px;
  transform:translateX(-50%) translateY(8px);
  font:400 italic 15px/1 var(--serif);color:rgba(230,232,240,.72);
  letter-spacing:.015em;pointer-events:none;
  opacity:0;
  transition:opacity .7s ease,transform .7s var(--ease);
}
#scrollhint.on{opacity:1;transform:translateX(-50%)}
#scrollhint.gone{opacity:0}
#scrollhint .arr{font-size:13px;line-height:1;color:rgba(230,232,240,.5);animation:bob 2.8s ease-in-out infinite}
@keyframes bob{0%,100%{transform:translateY(0)}50%{transform:translateY(5px)}}
body.sheet-open #scrollhint{opacity:0}

/* ----------------------------------------------------------------- sheet */
#sheet{
  position:fixed;left:50%;bottom:calc(var(--safe-b) + 66px);z-index:32;
  width:min(100% - 28px,520px);
  max-height:min(60svh,540px);
  border-radius:18px;padding:16px 18px 14px;
  background:rgba(14,20,36,.87);
  border:1px solid rgba(255,255,255,.07);
  -webkit-backdrop-filter:blur(18px) saturate(120%);
  backdrop-filter:blur(18px) saturate(120%);
  box-shadow:0 18px 50px rgba(3,5,12,.5);
  opacity:0;pointer-events:none;
  transform:translateX(-50%) translateY(12px);
  transition:opacity .32s ease,transform .32s var(--ease);
}
#sheet.on{opacity:1;pointer-events:auto;transform:translateX(-50%)}
#sheet-body{overflow-y:auto;-webkit-overflow-scrolling:touch;overscroll-behavior:contain;max-height:calc(min(60svh,540px) - 30px);padding-bottom:6px;scrollbar-width:none}
#sheet-body::-webkit-scrollbar{display:none}
#sheet-close{position:absolute;top:6px;right:6px;z-index:2;z-index:2}
.icon-btn.round{border-radius:50%;width:44px;height:44px;flex:none}

.sh-eyebrow{font:500 8.5px/1 var(--sans);letter-spacing:.32em;text-transform:uppercase;color:var(--ink-3);padding-right:44px}
.sh-name{font:500 22px/1.15 var(--serif);color:var(--ink);margin-top:7px}
.sh-name .sh-hip{font:400 11px/1 var(--sans);letter-spacing:.12em;color:var(--ink-3);margin-left:8px;vertical-align:2px}
.sh-line{font:400 11px/1.7 var(--sans);letter-spacing:.13em;color:rgba(233,235,242,.74);margin-top:7px;text-transform:none}
.sh-line .sep{color:var(--ink-4);margin:0 6px}
.sh-note{font:300 italic 15px/1.55 var(--serif);color:rgba(207,211,220,.84);margin:9px 0 1px}

/* ----------------------------------------------------------------- letter */
#letter{
  position:fixed;inset:0;z-index:40;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  padding:calc(var(--safe-t) + 34px) 28px calc(var(--safe-b) + 30px);
  background:radial-gradient(130% 100% at 50% 40%,rgba(9,13,25,.40) 0%,rgba(7,10,19,.88) 76%);
  opacity:0;pointer-events:none;will-change:opacity;
}
#sheet-close{color:rgba(233,235,242,.55)}
.l-back{
  position:absolute;left:50%;bottom:calc(var(--safe-b) + 16px);transform:translateX(-50%);
  font:500 8.5px/1 var(--sans);letter-spacing:.30em;text-transform:uppercase;
  color:rgba(233,235,242,.38);white-space:nowrap;
}
.l-date{font:500 9.5px/1 var(--sans);letter-spacing:.42em;color:var(--ink-3);margin:0 0 30px}
.l-body{max-width:29em;width:100%}
#letter .l-date,#letter .l-body{transform:translateY(var(--lshift,0px))}
.l-body p{
  margin:0 0 1.05em;max-width:29em;
  font:300 21px/1.70 var(--serif);letter-spacing:.005em;color:#eceef5;
  text-shadow:0 1px 14px rgba(5,8,16,.6);
  opacity:0;transform:translateY(7px);
  transition:opacity .95s ease,transform .95s ease;
}
#letter.lines .l-body p{opacity:1;transform:none}
.l-body p.l-sig{font:400 italic 20px/1 var(--serif);color:#c6c1e2;text-align:right;margin-top:1.4em;text-shadow:0 1px 14px rgba(5,8,16,.6)}

/* ------------------------------------------------------- reduced motion */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{transition-duration:.01ms !important;transition-delay:0ms !important;animation:none !important}
  #sky-wrap{transform:none}
}

/* ----------------------------------------------------------- landscape tweaks */
@media (orientation:landscape) and (max-height:520px){
  #caption{margin-top:10px}
  .cap-3{display:none}
  #invite{margin-top:10px}
  #dock{bottom:calc(var(--safe-b) + 6px)}
  .l-body p{font-size:17px;line-height:1.55;margin-bottom:.75em}
  .l-date{margin-bottom:14px}
  .l-back{display:none}
}

/* --------------------------------------------------------------- utility */

/* ------------------------------------------------------------- desktop */
@media (min-width:1024px){
  :root{--disc:min(74vmin,640px)}
}

/* ------------------------------------------------- landscape layout (late, so it wins) */
@media (orientation:landscape){
  #stage{flex-direction:row}
  #words{align-items:flex-start;margin-left:clamp(16px,4vw,60px)}
  #caption{text-align:left;margin-top:0}
  #invite{margin-top:12px}
}