/* ── CamGlass · estética mínima ───────────────────────────────────────── */

:root{
  --bg:#060709;
  --ink:rgba(255,255,255,.66);
  --ink-strong:rgba(255,255,255,.92);
  --ink-dim:rgba(255,255,255,.34);
  --line:rgba(255,255,255,.11);
  --line-soft:rgba(255,255,255,.06);
  --glass:rgba(255,255,255,.05);
  --glass-hi:rgba(255,255,255,.10);
  --radius:16px;
  --font:ui-sans-serif,-apple-system,"SF Pro Text","Helvetica Neue",Inter,system-ui,sans-serif;
  --ease:cubic-bezier(.22,.61,.36,1);
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:var(--font);
  font-size:12px;font-weight:450;letter-spacing:.02em;
  -webkit-font-smoothing:antialiased;
  overflow:hidden;overscroll-behavior:none;
}
button{font:inherit;color:inherit}

#app{position:fixed;inset:0}

#stage{
  position:absolute;inset:0;width:100%;height:100%;display:block;
  background:#060709;
  touch-action:none;cursor:crosshair;
}
#cam{position:absolute;width:2px;height:2px;opacity:0;pointer-events:none;left:-10px;top:-10px}

/* ── HUD superior ─────────────────────────────────────────────────────── */
.hud{
  position:absolute;top:0;left:0;right:0;z-index:3;
  display:flex;align-items:center;justify-content:space-between;
  padding:20px 24px;pointer-events:none;
  transition:opacity .5s var(--ease);
}
.brand{display:flex;align-items:center;gap:9px}
.brand .mark{
  width:9px;height:9px;border-radius:50%;
  border:1px solid rgba(255,255,255,.55);
  box-shadow:inset 0 0 6px rgba(255,255,255,.35),0 0 12px rgba(255,255,255,.12);
}
.brand .name{font-size:11px;letter-spacing:.22em;color:var(--ink-dim);text-transform:lowercase}

.hint{
  display:flex;align-items:center;gap:12px;
  font-size:11px;letter-spacing:.08em;color:var(--ink-dim);
  transition:opacity .8s var(--ease);
}
.hint span{display:inline-flex;align-items:center;gap:7px}
.hint.faded{opacity:0}
.dotsep{width:3px;height:3px;border-radius:50%;background:currentColor;opacity:.45}

/* ── Iconos de gesto (máscaras SVG) ───────────────────────────────────── */
.gi{
  display:inline-block;width:15px;height:15px;background:currentColor;flex:none;
  -webkit-mask:center/contain no-repeat var(--m);mask:center/contain no-repeat var(--m);
}
.gi.big{width:30px;height:30px}
.gi-write{--m:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='none' stroke='%23000' stroke-width='1.25' stroke-linecap='round'%3E%3Cpath d='M1.7 11.4c1.5-4.6 2.9-4.6 3.9 0 .9 4 2.2 1.4 2.9-1.6.6-2.9 1.8-4.2 2.9-2.3'/%3E%3Ccircle cx='13.3' cy='6.1' r='1.45' fill='%23000' stroke='none'/%3E%3C/svg%3E")}
.gi-erase{--m:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='none' stroke='%23000' stroke-width='1.25' stroke-linecap='round'%3E%3Ccircle cx='6.9' cy='8' r='4.3'/%3E%3Cpath d='M11.9 4.7c1.1 1 1.8 2.1 1.8 3.3s-.7 2.3-1.8 3.3'/%3E%3C/svg%3E")}

/* ── Dock inferior ────────────────────────────────────────────────────── */
.dock{
  position:absolute;left:50%;bottom:20px;transform:translateX(-50%);z-index:4;
  display:flex;align-items:center;gap:14px;
  padding:9px 14px;border-radius:var(--radius);
  background:rgba(14,16,20,.52);
  border:1px solid var(--line);
  box-shadow:0 18px 50px rgba(0,0,0,.45),inset 0 1px 0 rgba(255,255,255,.07);
  -webkit-backdrop-filter:blur(22px) saturate(150%);
  backdrop-filter:blur(22px) saturate(150%);
  animation:rise .7s var(--ease) both;
  max-width:calc(100vw - 32px);
  transition:opacity .4s var(--ease),transform .4s var(--ease);
}
@keyframes rise{from{opacity:0;transform:translate(-50%,14px)}to{opacity:1;transform:translate(-50%,0)}}
.dock[hidden]{display:none}
.dock.hidden-ui{opacity:0;pointer-events:none;transform:translate(-50%,14px)}

.group{display:flex;align-items:center;gap:12px}
.sep{width:1px;height:18px;background:var(--line-soft);flex:none}

.status{display:inline-flex;align-items:center;gap:7px;font-size:11px;letter-spacing:.07em;color:var(--ink-dim);white-space:nowrap}
.sdot{
  width:6px;height:6px;border-radius:50%;background:rgba(255,255,255,.22);
  transition:background .25s var(--ease),box-shadow .25s var(--ease);
}
.sdot.on{background:rgba(150,225,255,.95);box-shadow:0 0 10px rgba(140,215,255,.65)}
.sdot.draw{background:rgba(255,255,255,.98);box-shadow:0 0 12px rgba(255,255,255,.7)}
.sdot.erase{background:rgba(255,170,140,.95);box-shadow:0 0 10px rgba(255,150,110,.6)}

/* Sliders */
.ctrl{display:flex;align-items:center;gap:8px;font-size:10.5px;letter-spacing:.09em;color:var(--ink-dim)}
.ctrl span{min-width:38px;text-align:right;user-select:none}
input[type=range]{
  -webkit-appearance:none;appearance:none;background:transparent;
  width:76px;height:16px;margin:0;cursor:ew-resize;
}
input[type=range]::-webkit-slider-runnable-track{height:2px;border-radius:2px;background:rgba(255,255,255,.16)}
input[type=range]::-webkit-slider-thumb{
  -webkit-appearance:none;appearance:none;width:9px;height:9px;margin-top:-3.5px;border-radius:50%;
  background:rgba(255,255,255,.85);box-shadow:0 0 0 3px rgba(255,255,255,.06);
  transition:box-shadow .2s var(--ease);
}
input[type=range]:hover::-webkit-slider-thumb{box-shadow:0 0 0 5px rgba(255,255,255,.09)}
input[type=range]::-moz-range-track{height:2px;border-radius:2px;background:rgba(255,255,255,.16)}
input[type=range]::-moz-range-thumb{width:9px;height:9px;border:0;border-radius:50%;background:rgba(255,255,255,.85)}
input[type=range]:focus-visible{outline:1px solid rgba(255,255,255,.4);outline-offset:4px;border-radius:8px}

/* Tintes */
.swatches{gap:7px}
.swatch{
  width:15px;height:15px;padding:0;border-radius:50%;cursor:pointer;
  border:1px solid rgba(255,255,255,.22);background:var(--c);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.35);
  transition:transform .2s var(--ease),box-shadow .2s var(--ease),border-color .2s var(--ease);
}
.swatch:hover{transform:scale(1.14)}
.swatch[aria-pressed=true]{
  border-color:rgba(255,255,255,.85);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.5),0 0 0 3px rgba(255,255,255,.10);
}
.swatch:focus-visible{outline:1px solid rgba(255,255,255,.5);outline-offset:3px}

/* Botones icono */
.icon{
  width:28px;height:28px;display:grid;place-items:center;padding:0;cursor:pointer;
  border-radius:9px;border:1px solid transparent;background:transparent;color:var(--ink-dim);
  transition:color .2s var(--ease),background .2s var(--ease),border-color .2s var(--ease);
}
.icon svg{width:16px;height:16px;fill:none;stroke:currentColor;stroke-width:1.25;stroke-linecap:round;stroke-linejoin:round}
.icon:hover{color:var(--ink-strong);background:var(--glass);border-color:var(--line)}
.icon[aria-pressed=true]{color:var(--ink-strong);background:var(--glass-hi);border-color:var(--line)}
.icon:focus-visible{outline:1px solid rgba(255,255,255,.45);outline-offset:2px}

.meta{font-size:10px;letter-spacing:.1em;color:rgba(255,255,255,.24);min-width:44px;justify-content:flex-end;font-variant-numeric:tabular-nums}

/* ── Portada ──────────────────────────────────────────────────────────── */
.gate{
  position:absolute;inset:0;z-index:10;display:grid;place-items:center;
  background:radial-gradient(120% 90% at 50% 40%,rgba(24,28,36,.72),rgba(5,6,8,.96));
  -webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);
  transition:opacity .6s var(--ease),visibility .6s;
}
.gate.gone{opacity:0;visibility:hidden;pointer-events:none}
.gate-inner{text-align:center;padding:32px;max-width:460px;animation:fade .9s var(--ease) both}
@keyframes fade{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}

.gate h1{
  margin:0;font-size:15px;font-weight:500;letter-spacing:.34em;
  text-transform:lowercase;color:var(--ink-strong);
}
.tagline{margin:14px 0 34px;font-size:13px;line-height:1.6;color:var(--ink-dim);letter-spacing:.02em}

.gestures{display:flex;gap:14px;justify-content:center;margin-bottom:34px}
.gesture{
  flex:1;max-width:170px;padding:20px 14px;border-radius:14px;
  border:1px solid var(--line-soft);background:rgba(255,255,255,.028);
  display:flex;flex-direction:column;align-items:center;gap:10px;
}
.gesture .gi{color:rgba(255,255,255,.72)}
.gesture b{font-size:11px;font-weight:500;letter-spacing:.14em;color:var(--ink);text-transform:lowercase}
.gesture em{font-style:normal;font-size:11px;line-height:1.45;color:rgba(255,255,255,.3);letter-spacing:.02em}

.cta{
  padding:11px 26px;border-radius:11px;cursor:pointer;
  border:1px solid rgba(255,255,255,.2);background:rgba(255,255,255,.06);
  color:var(--ink-strong);font-size:11.5px;letter-spacing:.16em;text-transform:lowercase;
  -webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
  transition:background .25s var(--ease),border-color .25s var(--ease),transform .25s var(--ease);
}
.cta:hover{background:rgba(255,255,255,.11);border-color:rgba(255,255,255,.34);transform:translateY(-1px)}
.cta:active{transform:translateY(0)}
.cta:disabled{opacity:.5;cursor:default;transform:none}
.cta:focus-visible{outline:1px solid rgba(255,255,255,.5);outline-offset:3px}

.note{margin:20px 0 0;font-size:10.5px;letter-spacing:.06em;color:rgba(255,255,255,.24);line-height:1.6}
.note.err{color:rgba(255,150,120,.85)}

@media (max-width:640px){
  .hint{display:none}
  .dock{gap:10px;padding:8px 10px;overflow-x:auto;justify-content:flex-start}
  .ctrl span{display:none}
  input[type=range]{width:56px}
  .meta{display:none}
}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.01ms !important;transition-duration:.01ms !important}
}