/* ΑΡΙΘΜΟΔΕΝΤΡΟ 3D — UI shell. The 3D scene owns the whole viewport; everything here
   is a translucent layer on top of it. Sized generously: this is used on
   classroom tablets by children, so nothing is smaller than a fingertip. */

:root {
  --ink: #f4f8ee;
  --ink-dim: #b4c6a8;
  --accent: #8fd94a;
  --accent-2: #ffd166;
  --danger: #ff6b6b;
  --good: #7bed9f;
  --panel: rgba(18, 34, 20, 0.86);
  --panel-line: rgba(143, 217, 74, 0.26);
  --radius: 16px;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.55);
  --safe-t: env(safe-area-inset-top, 0px);
  --safe-b: env(safe-area-inset-bottom, 0px);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html, body {
  height: 100%;
  overflow: hidden;
  background: #0d1a10;
  color: var(--ink);
  font-family: "Trebuchet MS", "Segoe UI", system-ui, -apple-system, sans-serif;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
  overscroll-behavior: none;
  touch-action: none;
}

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

.layer { position: fixed; inset: 0; z-index: 2; }
.layer[hidden] { display: none; }

.overlay {
  display: grid;
  place-items: center;
  padding: calc(16px + var(--safe-t)) 16px calc(16px + var(--safe-b));
  background: radial-gradient(ellipse at center, rgba(10, 24, 12, 0.5), rgba(4, 12, 6, 0.9));
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  animation: fade 0.25s ease both;
}

@keyframes fade { from { opacity: 0; } to { opacity: 1; } }

/* --------------------------------------------------------------- panels --- */

.panel {
  width: min(700px, 100%);
  max-height: 100%;
  overflow-y: auto;
  padding: clamp(18px, 3.5vw, 32px);
  text-align: center;
  background: var(--panel);
  border: 1px solid var(--panel-line);
  border-radius: 24px;
  box-shadow: var(--shadow);
  animation: pop 0.35s cubic-bezier(0.2, 1.3, 0.4, 1) both;
}

.panel.small { width: min(450px, 100%); }

@keyframes pop {
  from { transform: scale(0.9) translateY(14px); opacity: 0; }
  to { transform: none; opacity: 1; }
}

.title {
  font-size: clamp(34px, 8vw, 62px);
  letter-spacing: 3px;
  line-height: 1;
  background: linear-gradient(180deg, #ffffff, var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 0 38px rgba(143, 217, 74, 0.3);
}
.title span { color: var(--accent-2); -webkit-text-fill-color: var(--accent-2); }

.subtitle {
  margin: 10px 0 20px;
  color: var(--ink-dim);
  font-size: clamp(14px, 3.2vw, 18px);
  line-height: 1.5;
}

.panel h2 { font-size: clamp(24px, 5.5vw, 36px); letter-spacing: 2px; margin-bottom: 8px; }
.panel p { color: var(--ink-dim); font-size: 17px; line-height: 1.5; }

/* ---------------------------------------------------------------- modes --- */

.modes { display: grid; gap: 10px; margin-bottom: 18px; }
@media (min-width: 560px) { .modes { grid-template-columns: repeat(3, 1fr); } }

.mode-btn {
  display: grid;
  gap: 2px;
  padding: 15px 10px;
  font: inherit;
  color: var(--ink);
  cursor: pointer;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--panel-line);
  border-radius: var(--radius);
  transition: transform 0.15s, background 0.15s, border-color 0.15s;
}
.mode-btn:hover, .mode-btn:focus-visible {
  transform: translateY(-3px);
  background: rgba(143, 217, 74, 0.18);
  border-color: var(--accent);
  outline: none;
}
.mode-btn:active { transform: translateY(0) scale(0.98); }
.mode-emoji { font-size: 26px; }
.mode-name { font-weight: 700; font-size: 18px; letter-spacing: 1.5px; }
.mode-desc { font-size: 12px; color: var(--ink-dim); }

/* ------------------------------------------------------------- settings --- */

.settings { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-bottom: 14px; }

.toggle {
  padding: 8px 13px;
  font: inherit;
  font-size: 13px;
  color: var(--ink-dim);
  cursor: pointer;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--panel-line);
  border-radius: 999px;
  transition: all 0.15s;
}
.toggle[aria-pressed="true"] { color: #10280a; background: var(--accent); border-color: var(--accent); }
.toggle:focus-visible { outline: 2px solid var(--accent-2); outline-offset: 2px; }

.hint-line, .best-line { font-size: 13px; color: var(--ink-dim); margin-top: 6px; }
kbd {
  padding: 2px 6px;
  font: inherit;
  font-size: 12px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid var(--panel-line);
  border-radius: 5px;
}

/* -------------------------------------------------------------- buttons --- */

.big-btn, .ghost-btn {
  display: block;
  width: 100%;
  margin-top: 12px;
  padding: 15px 18px;
  font: inherit;
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-decoration: none;
  cursor: pointer;
  border-radius: 14px;
  transition: transform 0.15s, filter 0.15s;
}
.big-btn {
  color: #10280a;
  background: linear-gradient(180deg, #c6f28a, var(--accent));
  border: none;
  box-shadow: 0 8px 24px rgba(143, 217, 74, 0.3);
}
.ghost-btn {
  color: var(--ink-dim);
  background: transparent;
  border: 1px solid var(--panel-line);
  font-size: 16px;
}
.big-btn:hover, .ghost-btn:hover { transform: translateY(-2px); filter: brightness(1.08); }
.big-btn:active, .ghost-btn:active { transform: scale(0.98); }

/* ------------------------------------------------------------------ HUD --- */

#hud { pointer-events: none; }
#hud button { pointer-events: auto; }

.hud-top {
  position: absolute;
  top: calc(10px + var(--safe-t));
  left: 10px;
  right: 10px;
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}

.chip {
  display: flex;
  gap: 7px;
  align-items: baseline;
  padding: 7px 13px;
  background: var(--panel);
  border: 1px solid var(--panel-line);
  border-radius: 999px;
  font-size: 17px;
  font-weight: 700;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.chip[hidden] { display: none; }
.chip-label { font-size: 10px; letter-spacing: 1.4px; color: var(--ink-dim); font-weight: 400; }
#lives { color: var(--danger); letter-spacing: 2px; }
#wind { color: var(--accent-2); }
.chip.bump { animation: bump 0.35s ease; }
@keyframes bump { 50% { transform: scale(1.18); } }

.icon-btn {
  width: 42px;
  height: 42px;
  font-size: 17px;
  color: var(--ink);
  cursor: pointer;
  background: var(--panel);
  border: 1px solid var(--panel-line);
  border-radius: 50%;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
#btn-pause { margin-left: auto; }
.icon-btn:active { transform: scale(0.92); }

/* ---------------------------------------------------------------- toast --- */

.toast {
  position: absolute;
  left: 50%;
  top: 22%;
  transform: translateX(-50%);
  padding: 12px 24px;
  font-size: clamp(20px, 4.5vw, 32px);
  font-weight: 700;
  letter-spacing: 2px;
  text-align: center;
  text-shadow: 0 4px 20px rgba(0, 0, 0, 0.7);
  animation: toast 1.2s ease-out both;
  pointer-events: none;
}
.toast.good { color: var(--good); }
.toast.bad { color: var(--danger); }
.toast.gold { color: var(--accent-2); }
@keyframes toast {
  0% { transform: translateX(-50%) scale(0.6); opacity: 0; }
  22% { transform: translateX(-50%) scale(1.1); opacity: 1; }
  70% { transform: translateX(-50%) translateY(-10px) scale(1); opacity: 1; }
  100% { transform: translateX(-50%) translateY(-40px) scale(0.95); opacity: 0; }
}

/* --------------------------------------------------------------- compact --- */

@media (max-width: 620px), (max-height: 520px) {
  .question { font-size: 18px; padding: 10px 18px; }
  .tilt button { width: 88px; height: 62px; font-size: 26px; }
  .tilt-hint { font-size: 10px; }
  .chip { font-size: 14px; padding: 5px 10px; }
  .icon-btn { width: 36px; height: 36px; font-size: 15px; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; }
}

/* ------------------------------------------------------- question + tilt --- */

.question {
  position: absolute;
  left: 50%;
  top: calc(66px + var(--safe-t));
  transform: translateX(-50%);
  max-width: calc(100% - 24px);
  padding: 12px 26px;
  font: inherit;
  font-size: clamp(17px, 3.4vw, 25px);
  font-weight: 700;
  letter-spacing: 1.5px;
  text-align: center;
  color: var(--ink);
  cursor: pointer;
  background: var(--panel);
  border: 1px solid var(--panel-line);
  border-radius: 999px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  animation: qpop 0.35s cubic-bezier(0.2, 1.3, 0.4, 1) both;
}
@keyframes qpop {
  from { transform: translateX(-50%) scale(0.9) translateY(10px); opacity: 0; }
  to { transform: translateX(-50%) scale(1); opacity: 1; }
}
.question:active { transform: translateX(-50%) scale(0.97); }
.question.right { color: #10280a; background: linear-gradient(180deg, #d5f7a6, var(--accent)); }
.question.wrong { color: #fff; background: linear-gradient(180deg, #ff8a8a, #d63d3d); }

#badge-combo {
  position: absolute;
  left: 12px;
  top: calc(62px + var(--safe-t));
  padding: 6px 12px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1px;
  color: #10280a;
  background: linear-gradient(90deg, var(--accent-2), #ffab5b);
  border-radius: 999px;
}
#badge-combo[hidden] { display: none; }

.tilt {
  position: absolute;
  left: 50%;
  bottom: calc(16px + var(--safe-b));
  transform: translateX(-50%);
  display: grid;
  grid-template-columns: auto auto;
  grid-auto-rows: auto;
  gap: 6px 22px;
  justify-items: center;
  align-items: center;
}

.tilt-hint {
  grid-column: 1 / -1;
  grid-row: 1;
  padding: 3px 12px;
  font-size: 11px;
  letter-spacing: 2px;
  color: var(--ink);
  background: var(--panel);
  border-radius: 999px;
}

.tilt button {
  width: 116px;
  height: 76px;
  font: inherit;
  font-size: 34px;
  color: var(--ink);
  cursor: pointer;
  background: var(--panel);
  border: 1px solid var(--panel-line);
  border-radius: 20px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: transform 0.08s, background 0.08s;
}
.tilt button:active, .tilt button.press {
  background: var(--accent);
  color: #10280a;
  transform: scale(0.95);
}