/* ExamCrafters — Alphabet Storm world
   Ground #fffaf0 paper · storm ink #1c1b1f · silver flash #c0c5cc
   saffron #e48b24 · indigo #274060 · teal #087f73 · coral #c65b52
   One superfamily behaving as matter: Anek Devanagari + Anek Latin */

:root{
  --ground:#fffaf0;
  --ink:#1c1b1f;
  --silver:#c0c5cc;
  --rain:#7c8791;
  --rain-deep:#4c5964;
  --mist:#e7eceb;
  --saffron:#e48b24;
  --indigo:#274060;
  --teal:#087f73;
  --coral:#c65b52;
  --wash-saffron:#fff3d8;
  --wash-blue:#eef3f8;
  --wash-teal:#edf7f3;
  --wash-coral:#fff0e9;
  --dev:"Anek Devanagari",sans-serif;
  --lat:"Anek Latin","Anek Devanagari",sans-serif;
  --rail-w:15.5rem;
  --hair:1px solid rgba(39,64,96,.42);
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

body{
  background:var(--ground);
  color:var(--ink);
  font-family:var(--lat);
  font-weight:400;
  line-height:1.55;
  overflow-x:hidden;
}
/* paper fiber: a faint procedural grain over the whole ground */
body::before{
  content:"";
  position:fixed;inset:0;z-index:0;
  pointer-events:none;
  opacity:.85;
  background-image:
    radial-gradient(1px 1px at 13% 21%, rgba(10,10,10,.07) 50%, transparent 51%),
    radial-gradient(1px 1px at 61% 7%,  rgba(10,10,10,.055) 50%, transparent 51%),
    radial-gradient(1.5px 1px at 34% 53%, rgba(10,10,10,.07) 50%, transparent 51%),
    radial-gradient(1px 1.5px at 79% 39%, rgba(10,10,10,.055) 50%, transparent 51%),
    radial-gradient(1px 1px at 8% 77%,  rgba(10,10,10,.07) 50%, transparent 51%),
    radial-gradient(1px 1px at 52% 91%, rgba(10,10,10,.055) 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 88% 67%, rgba(10,10,10,.05) 50%, transparent 51%),
    linear-gradient(115deg, transparent 42%, rgba(192,197,204,.10) 50%, transparent 58%);
  background-size:220px 220px, 310px 310px, 190px 190px, 270px 270px, 240px 240px, 330px 330px, 205px 205px, 100% 100%;
}

::selection{background:var(--ink);color:var(--ground)}

/* ── the storm canvas ─────────────────────────────── */
#storm{
  position:fixed;inset:0;
  width:100%;height:100%;
  pointer-events:none;
  z-index:0;
}

/* ── fixed rail ───────────────────────────────────── */
.rail{
  position:fixed;top:0;left:0;bottom:0;
  width:var(--rail-w);
  border-right:var(--hair);
  background:var(--ground);
  display:flex;flex-direction:column;
  padding:2rem 1.5rem;
  z-index:10;
}
.mark{
  display:flex;align-items:center;gap:.7rem;
  text-decoration:none;color:var(--ink);
}
.mark-glyph{
  font-family:var(--dev);
  font-size:1.9rem;font-weight:800;line-height:1;
  background:var(--saffron);color:var(--ink);
  width:3.1rem;height:3.1rem;
  display:grid;place-items:center;
}
.mark-word{
  font-weight:700;font-size:1.05rem;line-height:1.05;
  text-transform:uppercase;letter-spacing:.02em;
}
.rail-nav{
  margin-top:3.5rem;
  display:flex;flex-direction:column;gap:1.1rem;
}
.rail-nav a{
  color:var(--ink);text-decoration:none;
  font-size:.95rem;font-weight:600;
  letter-spacing:.04em;text-transform:uppercase;
  transition:font-weight .15s,letter-spacing .2s ease;
}
.rail-nav a span{color:var(--rain-deep);font-weight:400;text-transform:none;letter-spacing:0}
.rail-nav a:hover{font-weight:800;letter-spacing:.07em}
.rail-nav a:focus-visible,.btn:focus-visible,.pick:focus-visible,.player-facade:focus-visible{
  outline:2px solid var(--ink);outline-offset:3px;
}
.weather{
  margin-top:auto;
  border-top:var(--hair);
  padding-top:1.2rem;
}
.weather-h{
  font-size:.7rem;font-weight:700;
  letter-spacing:.18em;text-transform:uppercase;
  margin-bottom:.8rem;
}
.weather-line{font-size:.85rem;color:var(--rain-deep);margin-bottom:.7rem}
.weather-line strong{color:var(--ink)}
.weather-big{
  display:block;font-family:var(--dev);
  font-size:1.25rem;font-weight:700;color:var(--indigo);line-height:1.2;
}
.rail-cta{
  margin-top:1.4rem;position:relative;
  display:block;text-align:center;
  background:var(--indigo);color:var(--ground);
  text-decoration:none;font-weight:700;
  letter-spacing:.12em;text-transform:uppercase;font-size:.85rem;
  padding:.85rem 1rem;
}

/* ── mobile topbar ────────────────────────────────── */
.topbar{display:none}

/* ── shared ───────────────────────────────────────── */
main{
  position:relative;z-index:1;
  margin-left:var(--rail-w);
}
section{
  padding:7rem clamp(2rem,6vw,6rem) 6rem;
  position:relative;
}

.sec-h{
  font-size:clamp(2.4rem,5vw,4.2rem);
  font-weight:800;line-height:1.02;
  letter-spacing:-.02em;
  text-transform:uppercase;
  margin-bottom:1.6rem;
  text-wrap:balance;
}
.sec-h-dev{font-family:var(--dev);text-transform:none;letter-spacing:0;color:var(--indigo)}
.sec-h-en{
  color:var(--teal);font-weight:700;
  font-size:.55em;letter-spacing:.05em;
}
.sec-lede{
  max-width:34rem;
  font-size:1.1rem;color:var(--ink);
  margin-bottom:3rem;
}

.btn{
  position:relative;display:inline-block;
  font-family:var(--lat);
  font-weight:700;font-size:.95rem;
  letter-spacing:.1em;text-transform:uppercase;
  text-decoration:none;text-align:center;
  padding:1rem 1.9rem;
  border:2px solid var(--indigo);
  cursor:pointer;
  transition:transform .22s cubic-bezier(.16,1,.3,1),background .18s,color .18s;
}
.btn-ink{
  background:var(--indigo);color:var(--ground);
  box-shadow:0 4px 18px rgba(10,10,10,.22);
}
.btn-line{background:var(--ground);color:var(--indigo)}
.btn-ink:hover{transform:translateY(-2px)}
.btn-line:hover{background:var(--indigo);color:var(--ground);transform:translateY(-2px)}
/* dissolving right edge — letters blowing off the button */
.dissolve-edge{
  position:absolute;top:0;right:-2px;bottom:0;width:1.4rem;
  background:
    radial-gradient(2px 2px at 20% 25%,var(--ground) 45%,transparent 50%),
    radial-gradient(2px 2px at 65% 15%,var(--ground) 45%,transparent 50%),
    radial-gradient(2.5px 2.5px at 40% 55%,var(--ground) 45%,transparent 50%),
    radial-gradient(2px 2px at 78% 45%,var(--ground) 45%,transparent 50%),
    radial-gradient(2px 2px at 30% 82%,var(--ground) 45%,transparent 50%),
    radial-gradient(2.5px 2.5px at 70% 75%,var(--ground) 45%,transparent 50%);
  opacity:0;transition:opacity .18s;
}
.btn-ink:hover .dissolve-edge,.rail-cta:hover .dissolve-edge{opacity:1}
.rail-cta .dissolve-edge{width:1.1rem}

/* ── hero ─────────────────────────────────────────── */
.hero{
  min-height:100vh;
  display:flex;flex-direction:column;justify-content:center;
  padding-top:5rem;
  background:
    radial-gradient(ellipse 70% 46% at 78% 12%,rgba(228,139,36,.16),transparent 68%),
    radial-gradient(ellipse 58% 42% at 16% 82%,rgba(39,64,96,.10),transparent 70%);
}
.hero-h{
  display:flex;flex-direction:column;
  font-weight:800;
  line-height:.92;
  letter-spacing:-.025em;
  margin-bottom:2.2rem;
  user-select:none;
}
.hh{display:block}
.hh-dev{
  font-family:var(--dev);
  font-size:clamp(5rem,16vw,13rem);
  line-height:1.05;
  letter-spacing:0;
  color:var(--indigo);
}
.hh-lat{font-size:clamp(3.4rem,10.5vw,8.5rem);text-transform:uppercase}
.hh-lat:last-child{color:var(--coral)}
.hero-sub{
  font-size:clamp(1.05rem,1.6vw,1.35rem);
  color:var(--rain-deep);
  max-width:32rem;
  margin-bottom:2.4rem;
}
.hero-actions{display:flex;flex-wrap:wrap;gap:1rem;margin-bottom:4rem}
.hero-forecast{
  border-top:var(--hair);
  padding-top:1.2rem;
  max-width:40rem;
  font-size:.92rem;color:var(--rain-deep);
}
.hero-forecast strong{color:var(--saffron);text-transform:uppercase;letter-spacing:.08em;font-size:.8rem}
.scroll-cue{
  position:absolute;bottom:1.4rem;right:clamp(2rem,6vw,6rem);
  font-size:.8rem;letter-spacing:.14em;text-transform:uppercase;
  color:var(--rain);
  animation:cue 2.4s ease-in-out infinite;
}
@keyframes cue{0%,100%{transform:translateY(0)}50%{transform:translateY(.5rem)}}

/* per-char storm assembly (JS splits [data-assemble] into .ch spans) */
.ch{display:inline-block;will-change:transform,opacity,filter}

/* ── sandhi lab ───────────────────────────────────── */
.sandhi{
  border-top:var(--hair);
  background:
    radial-gradient(circle at 82% 18%,rgba(228,139,36,.16),transparent 30%),
    var(--wash-saffron);
}
.sandhi-lab{
  border:var(--hair);
  display:grid;
  grid-template-columns:1fr minmax(15rem,20rem);
}
.sandhi-stage{
  position:relative;
  min-height:22rem;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:1rem;overflow:hidden;
  padding:2rem;
}
.sandhi-row{
  display:flex;align-items:baseline;gap:2.5vw;
  font-family:var(--dev);
  font-size:clamp(3rem,7vw,6rem);
  font-weight:700;line-height:1.15;
}
.sw{display:inline-block}
.sw-plus{color:var(--saffron);font-family:var(--lat);font-weight:300}
.sw-fused{
  position:absolute;left:50%;top:42%;
  transform:translate(-50%,-50%) scale(.6);
  font-family:var(--dev);
  font-size:clamp(3.4rem,8vw,7rem);
  font-weight:800;line-height:1.15;
  opacity:0;pointer-events:none;
  white-space:nowrap;
}
.sandhi-flash{
  position:absolute;left:50%;top:42%;
  width:34rem;height:34rem;max-width:90vw;
  transform:translate(-50%,-50%) scale(0);
  border-radius:50%;
  background:radial-gradient(circle,var(--silver) 0%,rgba(192,197,204,.55) 35%,transparent 68%);
  opacity:0;pointer-events:none;
}
.sandhi-gloss{
  position:absolute;bottom:1.4rem;left:0;right:0;
  text-align:center;
  font-size:.95rem;color:var(--rain-deep);
}
.sandhi-controls{
  border-left:var(--hair);
  background:rgba(255,255,255,.42);
  display:flex;flex-direction:column;
  padding:1.6rem;gap:1.4rem;
}
.btn-collide{width:100%}
.sandhi-picks{display:flex;flex-direction:column;gap:.5rem}
.pick{
  font-family:var(--dev);
  font-size:1.15rem;font-weight:600;
  background:var(--ground);color:var(--rain-deep);
  border:none;border-bottom:1px solid var(--mist);
  text-align:left;padding:.55rem .2rem;
  cursor:pointer;
  transition:color .15s,font-weight .15s,transform .22s cubic-bezier(.16,1,.3,1);
}
.pick:hover{color:var(--ink);transform:translateX(.6rem)}
.pick.is-active{color:var(--ink);font-weight:800;border-bottom-color:var(--ink)}
.pick.is-active{color:var(--indigo);border-bottom-color:var(--indigo)}

/* ── today's lesson ───────────────────────────────── */
.paath{
  border-top:var(--hair);
  background:
    radial-gradient(ellipse 62% 44% at 88% 16%,rgba(39,64,96,.10),transparent 70%),
    var(--wash-blue);
}
.player{
  border:var(--hair);
  max-width:62rem;
  aspect-ratio:16/9;
  position:relative;
  background:var(--ink);
}
.player iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.player-facade{
  position:absolute;inset:0;width:100%;height:100%;
  border:0;padding:0;cursor:pointer;
  background:var(--ink);
  overflow:hidden;
}
.player-facade img{
  width:100%;height:100%;object-fit:cover;
  opacity:.85;
  filter:grayscale(1) contrast(1.08);
  transition:filter .35s ease,opacity .35s ease,transform .5s ease;
}
.player-facade:hover img{filter:grayscale(0);opacity:1;transform:scale(1.02)}
.player-play{
  position:absolute;left:50%;top:50%;
  transform:translate(-50%,-50%);
  width:7.5rem;height:7.5rem;
  background:var(--ground);
  border-radius:50%;
  display:grid;place-items:center;
  box-shadow:0 10px 40px rgba(10,10,10,.45);
  transition:transform .25s cubic-bezier(.16,1,.3,1);
}
.player-play svg{width:3.2rem;height:3.2rem;margin-left:.4rem}
.player-facade:hover .player-play{transform:translate(-50%,-50%) scale(1.08)}
.player-label{
  position:absolute;left:1.4rem;bottom:1.2rem;
  color:var(--ground);
  font-weight:700;letter-spacing:.12em;text-transform:uppercase;font-size:.85rem;
  text-shadow:0 2px 10px rgba(10,10,10,.8);
}
.paath-note{
  margin-top:1.6rem;max-width:40rem;
  color:var(--rain-deep);font-size:.98rem;
}

/* ── chapter library ──────────────────────────────── */
.adhyay{
  border-top:var(--hair);
  background:
    radial-gradient(ellipse 55% 50% at 12% 20%,rgba(8,127,115,.10),transparent 72%),
    var(--wash-teal);
}
.lib{list-style:none;border-top:var(--hair);max-width:62rem}
.lib-row{
  display:grid;
  grid-template-columns:10rem 1fr 1.4fr;
  gap:1.5rem;align-items:baseline;
  border-bottom:var(--hair);
  padding:1.5rem .4rem;
  transition:background .2s,transform .25s cubic-bezier(.16,1,.3,1);
}
.lib-row:hover{background:rgba(8,127,115,.12);transform:translateX(1.2rem)}
.lib-class{
  font-size:.78rem;font-weight:700;
  letter-spacing:.13em;text-transform:uppercase;
  color:var(--rain-deep);
}
.lib-book{
  font-family:var(--dev);
  font-size:clamp(1.6rem,2.6vw,2.3rem);
  font-weight:800;line-height:1.2;
  color:var(--indigo);text-decoration:none;
}
.lib-book:hover{text-decoration:underline;text-underline-offset:.3rem;text-decoration-thickness:3px}
.lib-en{
  font-family:var(--lat);
  font-size:.5em;font-weight:600;color:var(--rain-deep);
  letter-spacing:.06em;text-transform:uppercase;
  white-space:nowrap;
}
.lib-ch{font-family:var(--dev);font-size:1rem;color:var(--rain-deep)}
.lib-all{margin-top:2.4rem}

/* ── the teacher — still water ────────────────────── */
.guru{
  border-top:var(--hair);
  background:
    radial-gradient(120% 90% at 50% 0%, rgba(228,139,36,.22), transparent 55%),
    var(--indigo);
  color:var(--ground);
  padding-top:8rem;padding-bottom:8rem;
  text-align:center;
}
.guru-q{
  font-family:var(--dev);
  font-size:clamp(1.5rem,3.2vw,2.6rem);
  font-weight:300;line-height:1.45;
  max-width:52rem;margin:0 auto 3.5rem;
  text-wrap:balance;
}
.guru-name{
  font-size:clamp(2.2rem,4.5vw,3.8rem);
  font-weight:800;text-transform:uppercase;letter-spacing:-.01em;
  margin-bottom:1rem;
  color:var(--saffron);
}
.guru-name::before{
  content:"";
  display:block;width:7rem;height:2px;
  margin:0 auto 2.2rem;
  background:linear-gradient(90deg,transparent,var(--silver) 30%,#f2f4f6 50%,var(--silver) 70%,transparent);
}
.guru-bio{color:var(--silver);font-size:1.05rem;max-width:36rem;margin:0 auto}

/* ── app forecast ─────────────────────────────────── */
.app{
  border-top:var(--hair);
  padding-bottom:8rem;
  background:
    radial-gradient(ellipse 65% 50% at 90% 14%,rgba(198,91,82,.12),transparent 72%),
    var(--wash-coral);
}
.app .sec-h-dev{font-size:1.35em;display:inline-block;color:var(--coral)}
.app-grid{
  display:grid;
  grid-template-columns:minmax(0,1.2fr) minmax(16rem,22rem);
  gap:4rem;align-items:start;
  max-width:62rem;
}
.app-forecast{
  list-style:none;max-width:36rem;
  margin-bottom:2.8rem;
  border-top:var(--hair);
}
.app-forecast li{
  border-bottom:1px solid var(--mist);
  padding:1.1rem .2rem;
  font-size:1.08rem;
}
.maybe{
  font-size:.78rem;font-weight:700;color:var(--rain-deep);
  letter-spacing:.13em;text-transform:uppercase;
  margin-right:.4rem;
}
.app-note{margin-top:1rem;color:var(--rain-deep);font-size:.92rem}

/* the app device — drawn in the world's own ink */
.app-device{margin:0}
.dev-frame{
  border:2px solid var(--ink);
  border-radius:1.6rem;
  background:
    linear-gradient(160deg, rgba(192,197,204,.14), transparent 35%),
    var(--ground);
  padding:1.3rem 1.2rem 1.6rem;
  box-shadow:6px 10px 0 rgba(10,10,10,.16), 12px 20px 34px rgba(10,10,10,.14);
  transform:rotate(1.5deg);
}
.dev-top{
  display:flex;align-items:center;gap:.5rem;
  font-family:var(--dev);font-weight:800;font-size:1.15rem;
  border-bottom:var(--hair);
  padding-bottom:.8rem;margin-bottom:1.1rem;
}
.dev-mark{
  background:var(--indigo);color:var(--ground);
  font-size:.95rem;width:1.7rem;height:1.7rem;
  display:grid;place-items:center;
}
.dev-soon{
  margin-left:auto;
  font-family:var(--lat);font-size:.62rem;font-weight:700;
  letter-spacing:.16em;text-transform:uppercase;
  border:1px solid var(--ink);
  background:linear-gradient(135deg,var(--mist),var(--silver));
  padding:.2rem .5rem;
}
.dev-h{
  font-weight:800;font-size:1rem;text-transform:uppercase;letter-spacing:.03em;
  margin-bottom:.9rem;
}
.dev-hsub{
  display:block;font-weight:400;text-transform:none;letter-spacing:0;
  color:var(--rain-deep);font-size:.82rem;
}
.dev-tracker{list-style:none;margin-bottom:1.3rem}
.dev-tracker li{
  display:flex;align-items:center;gap:.8rem;
  padding:.45rem 0;
}
.dt-name{font-family:var(--dev);font-size:.98rem;font-weight:600;flex:1}
.dt-bar{
  flex:1.1;height:.55rem;
  border:1px solid var(--ink);
  overflow:hidden;
}
.dt-fill{
  display:block;height:100%;
  width:calc(var(--p) * 100%);
  background:var(--indigo);
}
.dev-tracker li:nth-child(2) .dt-fill{background:var(--teal)}
.dev-tracker li:nth-child(3) .dt-fill{background:var(--saffron)}
.dev-tracker li:nth-child(4) .dt-fill{background:var(--coral)}
.dt-storm{
  background:repeating-linear-gradient(-45deg,var(--rain) 0 3px,transparent 3px 6px);
}
.dev-q{border-top:var(--hair);padding-top:1rem}
.dev-qt{font-family:var(--dev);font-weight:700;font-size:1.05rem;margin-bottom:.7rem}
.dev-opts{display:flex;gap:.6rem}
.dev-opt{
  font-family:var(--dev);font-size:1rem;font-weight:600;
  border:1px solid var(--rain);color:var(--rain-deep);
  padding:.4rem .9rem;
}
.dev-opt.is-right{
  border:2px solid var(--ink);color:var(--ink);
  background:rgba(8,127,115,.12);
}
.dev-cap{
  margin-top:1rem;text-align:center;
  font-size:.8rem;color:var(--rain-deep);
  letter-spacing:.08em;text-transform:uppercase;font-weight:600;
}

/* ── close ────────────────────────────────────────── */
.close{
  position:relative;z-index:1;
  margin-left:var(--rail-w);
  border-top:var(--hair);
  padding:6rem clamp(2rem,6vw,6rem) 3rem;
  text-align:center;
  background:var(--wash-saffron);
}
.close-big{
  font-family:var(--dev);
  font-size:clamp(4rem,12vw,10rem);
  font-weight:800;line-height:1.1;
  margin-bottom:.6rem;
  user-select:none;
  color:var(--indigo);
}
.close-en{color:var(--rain-deep);font-size:1.15rem;margin-bottom:2.6rem}
.close-actions{display:flex;justify-content:center;flex-wrap:wrap;gap:1rem;margin-bottom:4rem}
.close-fine{font-size:.85rem;color:var(--rain-deep)}
.close-fine a{color:var(--ink)}

/* ── responsive ───────────────────────────────────── */
@media (max-width:1100px){
  .rail{display:none}
  main,.close{margin-left:0}
  .topbar{
    position:fixed;top:0;left:0;right:0;z-index:10;
    display:flex;justify-content:space-between;align-items:center;
    background:var(--ground);
    border-bottom:var(--hair);
    padding:.8rem 1.2rem;
  }
  .mark-small{
    font-weight:800;font-size:1.05rem;
    color:var(--ink);text-decoration:none;
    text-transform:uppercase;letter-spacing:.03em;
  }
  .topbar-cta{
    background:var(--indigo);color:var(--ground);
    text-decoration:none;font-weight:700;font-size:.8rem;
    letter-spacing:.1em;text-transform:uppercase;
    padding:.55rem 1.1rem;
  }
  .hero{padding-top:6.5rem}
  section{padding:5rem 1.4rem 4rem}
  .sandhi-lab{grid-template-columns:1fr}
  .sandhi-controls{border-left:none;border-top:var(--hair)}
  .sandhi-picks{flex-direction:row;flex-wrap:wrap}
  .pick{border-bottom:2px solid var(--mist);flex:1 1 40%}
  .lib-row{grid-template-columns:1fr;gap:.3rem;padding:1.2rem .2rem}
  .app-grid{grid-template-columns:1fr;gap:3rem}
  .app-device{order:-1}
  .dev-frame{transform:rotate(1.5deg);max-width:22rem;margin:0 auto}
  .dev-cap{max-width:22rem;margin-left:auto;margin-right:auto}
  .scroll-cue{display:none}
  .player-play{width:5rem;height:5rem}
  .player-play svg{width:2.2rem;height:2.2rem}
}

/* ── reduced motion: the storm rests ──────────────── */
@media (prefers-reduced-motion:reduce){
  #storm{display:none}
  .scroll-cue{animation:none}
  .ch{opacity:1 !important;transform:none !important;filter:none !important}
  .btn,.pick,.lib-row,.player-facade img,.player-play{transition:none}
}