/* ARCO — arco.css */

:root {
  --bg: #07080e;
  --ink: #e8eeff;
  --muted: #93a0c4;
  --line: rgba(150, 170, 230, 0.16);
  --panel: rgba(13, 16, 27, 0.94);
  --accent: #ffb454;
  --teal: #34e0c0;
}
body[data-inst="violin"] { --accent: #6fd0ff; }

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--ink);
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
  overscroll-behavior: none;
  -webkit-user-select: none;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  touch-action: none;
}

#stage {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
}

/* ------------------------------------------------------------------ toolbar */

.bar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 40px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 max(8px, env(safe-area-inset-left)) 0 max(8px, env(safe-area-inset-right));
  background: linear-gradient(to bottom, rgba(7, 8, 14, 0.95), rgba(7, 8, 14, 0.55) 70%, transparent);
  z-index: 20;
  pointer-events: none;
}
.bar > * { pointer-events: auto; }
.bar-l { flex: 0 0 auto; }
.bar-c { flex: 1 1 auto; display: flex; align-items: center; justify-content: center; gap: 6px; min-width: 0; }
.bar-r { flex: 0 0 auto; display: flex; align-items: center; gap: 4px; }

.wordmark {
  font-weight: 800;
  letter-spacing: 0.22em;
  font-size: 13px;
  color: var(--accent);
  padding-left: 2px;
}

.keypick { display: flex; align-items: center; gap: 2px; }
.keyname {
  min-width: 34px;
  font: 700 15px ui-monospace, SFMono-Regular, Menlo, monospace;
  color: var(--teal);
  background: rgba(52, 224, 192, 0.08);
  border: 1px solid rgba(52, 224, 192, 0.28);
  border-radius: 7px;
  padding: 3px 6px;
}

button, select {
  font-family: inherit;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--line);
  border-radius: 7px;
  cursor: pointer;
}
button:active { transform: translateY(1px); }

.mini {
  font-size: 12px;
  padding: 4px 7px;
  line-height: 1;
  min-width: 26px;
  min-height: 26px;
}
.mini.wide { min-width: 92px; }

.sel {
  font-size: 11.5px;
  padding: 4px 4px;
  max-width: 120px;
}

.seg { display: flex; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; }
.segbtn {
  border: 0;
  border-radius: 0;
  font-size: 11.5px;
  font-weight: 600;
  padding: 5px 10px;
  background: transparent;
  color: var(--muted);
}
.segbtn.on { background: var(--accent); color: #0a0c15; }

.tog {
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.02em;
  padding: 5px 7px;
  color: var(--muted);
  min-height: 26px;
}
.tog.on {
  color: #0a0c15;
  background: var(--accent);
  border-color: var(--accent);
}
/* Icon-only buttons have no text to give them width, and a 21px target is a
 * miss waiting to happen. */
.tog.icon { min-width: 30px; font-size: 13px; padding: 4px 5px; }

/* ------------------------------------------------------------------ trainer */

.trainer {
  position: fixed;
  top: 42px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 19;
  display: flex;
  align-items: center;
  gap: 10px;
  max-width: min(94vw, 640px);
  padding: 5px 8px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(11, 14, 24, 0.86);
  backdrop-filter: blur(8px);
}
.trainer[hidden] { display: none; }
.trainer-head { display: flex; flex-direction: column; line-height: 1.25; flex: 0 0 auto; }
.trainer-head strong { font-size: 11.5px; }
.trainer-row { display: flex; gap: 4px; overflow: hidden; flex: 1 1 auto; }
.trainer-act { display: flex; gap: 4px; flex: 0 0 auto; }

.chip {
  font: 600 11px ui-sans-serif, system-ui, sans-serif;
  padding: 3px 7px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--muted);
  white-space: nowrap;
}
.chip.now {
  background: #fff;
  color: #0a0c15;
  box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.14);
}
.chip.done { opacity: 0.32; }

.muted { color: var(--muted); font-size: 10px; }

/* ----------------------------------------------------------------- overlays */

.overlay {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12px;
  background: radial-gradient(120% 120% at 50% 0%, #101528 0%, #05060b 70%);
  overflow: auto;
}
.overlay.soft { background: rgba(4, 5, 10, 0.72); backdrop-filter: blur(6px); }
.overlay.hard { background: #05060b; z-index: 60; }
.overlay[hidden] { display: none; }

.panel {
  position: relative;
  width: min(660px, 96vw);
  max-height: 96vh;
  overflow: auto;
  padding: 18px 20px 20px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--panel);
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.6);
  text-align: center;
}
.panel.small { width: min(440px, 94vw); text-align: left; }

.title {
  margin: 0;
  font-size: 34px;
  font-weight: 800;
  letter-spacing: 0.3em;
  background: linear-gradient(90deg, #ffb454, #6fd0ff);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.sub { margin: 4px 0 12px; color: var(--muted); font-size: 12.5px; }

.holdfig { width: min(340px, 90%); height: auto; margin: 0 auto 6px; display: block; }

.rules {
  text-align: left;
  margin: 6px auto 10px;
  padding-left: 18px;
  max-width: 540px;
  font-size: 12.5px;
  line-height: 1.5;
  color: #cdd7f2;
}
.rules li { margin-bottom: 5px; }
.rules b { color: var(--ink); }

.fine { font-size: 11px; color: var(--muted); line-height: 1.5; margin: 6px 0; }
.fine b { color: #cdd7f2; }
.kb { margin-top: 10px; }
kbd {
  font: 600 10px ui-monospace, SFMono-Regular, Menlo, monospace;
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 4px;
  padding: 1px 4px;
  background: rgba(255, 255, 255, 0.04);
}

.cta {
  margin-top: 12px;
  padding: 12px 30px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: #0a0c15;
  background: linear-gradient(90deg, #ffb454, #ffd08a);
  border: 0;
  border-radius: 999px;
  box-shadow: 0 8px 26px rgba(255, 180, 84, 0.25);
}
.cta:disabled { opacity: 0.6; }
.err { color: #ff8080; font-size: 11.5px; margin-top: 8px; }

.panel h2 { margin: 0 0 12px; font-size: 16px; }
.panel h3 { margin: 16px 0 6px; font-size: 12.5px; color: var(--accent); }
.row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 9px;
  font-size: 12.5px;
}
.stepper { display: flex; align-items: center; gap: 8px; }
.stepper span { font: 600 13px ui-monospace, monospace; min-width: 14px; text-align: center; }

.x {
  position: absolute;
  top: 10px; right: 10px;
  width: 28px; height: 28px;
  border-radius: 8px;
  font-size: 13px;
  line-height: 1;
}

.ctarow { display: flex; align-items: center; justify-content: center; gap: 10px; flex-wrap: wrap; }
.cta.ghost {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent);
  box-shadow: none;
  padding: 11px 22px;
  font-size: 14px;
}
.iosnote { margin-top: 8px; }

/* ------------------------------------------------------------ portrait way in */

.rotmsg { text-align: center; color: var(--muted); padding: 16px; }
.rotico { font-size: 44px; color: var(--accent); animation: spin 2.4s ease-in-out infinite; }
@keyframes spin { 0%, 100% { transform: rotate(0); } 50% { transform: rotate(90deg); } }
.rottitle { margin: 6px 0 2px; font-size: 15px; font-weight: 700; color: var(--ink); }

.taphint {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  margin: 22px auto 0;
  padding: 16px 22px;
  max-width: 260px;
  border: 1px dashed rgba(255, 180, 84, 0.42);
  border-radius: 16px;
  background: rgba(255, 180, 84, 0.06);
  color: var(--ink);
  font-size: 13px;
}
.taphint .fine { margin: 0; }
.tapdots { display: flex; gap: 7px; margin-bottom: 5px; }
.tapdots i {
  width: 11px; height: 11px;
  border-radius: 50%;
  background: var(--accent);
  animation: tapz 1.5s ease-in-out infinite;
}
.tapdots i:nth-child(2) { animation-delay: 0.19s; }
@keyframes tapz {
  0%, 62%, 100% { transform: scale(0.6); opacity: 0.35; }
  22% { transform: scale(1); opacity: 1; }
}
.rotfail { margin-top: 14px; max-width: 280px; color: #ffb08a; }

/* Landscape phones are short — tighten the chrome so the arcs keep the room,
 * and lay the start panel out in two columns so the button stays above the fold
 * instead of hiding below a scroll on the very first screen. */
@media (max-height: 430px) {
  .bar { height: 34px; }
  .tog { font-size: 10px; padding: 4px 6px; min-height: 24px; }
  .tog.icon { min-width: 29px; min-height: 26px; font-size: 12.5px; }
  .segbtn { padding: 4px 8px; }
  .trainer { top: 36px; padding: 4px 7px; }

  .panel { padding: 11px 16px 13px; }
  .title { font-size: 21px; }
  .sub { font-size: 10.5px; margin: 2px 0 7px; }
  .startgrid {
    display: grid;
    grid-template-columns: 0.82fr 1fr;
    gap: 14px;
    align-items: center;
  }
  .holdfig { width: 100%; margin: 0; }
  .rules { margin: 0; font-size: 11px; line-height: 1.42; }
  .rules li { margin-bottom: 3px; }
  .startfine { font-size: 10px; margin: 7px 0 0; }
  .cta { margin-top: 8px; padding: 9px 26px; font-size: 14px; }
  .cta.ghost { padding: 8px 18px; font-size: 13px; }
  .iosnote { margin-top: 5px; font-size: 9.5px; }
  .kb { display: none; }
}
@media (max-width: 720px) {
  .sel { max-width: 84px; }
  .wordmark { display: none; }
}