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

body {
  font-family: monospace;
  background: #111;
  color: #ddd;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 10px;
  height: 100dvh;
  overflow: hidden;
  touch-action: none;
  user-select: none;
}

#game-title {
  font-size: 11px;
  letter-spacing: 4px;
  color: #aaa;
  text-align: center;
  padding: 2px 0 4px;
}

#main {
  display: flex;
  gap: 8px;
  align-items: flex-start;
}

#canvas-wrap {
  position: relative;
  border: 1px solid #333;
  border-radius: 4px;
  overflow: hidden;
  background: #0a0a0a;
  flex-shrink: 0;
}

canvas { display: block; }

#side {
  display: flex;
  flex-direction: column;
  gap: 6px;
  width: 80px;
  flex-shrink: 0;
}

.panel {
  border: 1px solid #333;
  border-radius: 4px;
  padding: 6px 8px;
  background: #0d0d0d;
}

.lbl {
  font-size: 9px;
  letter-spacing: 2px;
  color: #eee;
  margin-bottom: 3px;
}

.val {
  font-size: 18px;
  font-weight: bold;
  color: #ccc;
  line-height: 1;
}

#chain-num.flash { animation: cfl 0.4s ease-out; }
@keyframes cfl {
  0%   { transform: scale(1.7); color: #ffd60a; }
  100% { transform: scale(1); }
}

/* ── toggles (language / sfx) ──────────────────────────────────────────── */

#lang-toggle, #sfx-toggle {
  display: flex;
  gap: 4px;
}

.lang-btn, .sfx-btn {
  flex: 1;
  padding: 4px 0;
  font-family: monospace;
  font-size: 10px;
  letter-spacing: 1px;
  cursor: pointer;
  border-radius: 3px;
  border: 1px solid #333;
  background: #111;
  color: #444;
}
.lang-btn.active, .sfx-btn.active { border-color: #ffd60a; color: #ffd60a; background: #1a1800; }
.lang-btn:hover:not(.active), .sfx-btn:hover:not(.active) { color: #888; border-color: #555; }

/* ── side buttons ───────────────────────────────────────────────────────── */

/* Help lives in the bottom-right corner, away from the play area, to avoid
   accidental taps during a game. */
#help-btn {
  position: fixed;
  bottom: 8px;
  right: 8px;
  padding: 5px 9px;
  font-family: monospace;
  font-size: 10px;
  letter-spacing: 1px;
  cursor: pointer;
  border-radius: 3px;
  border: 1px solid #555;
  background: #0d0d0d;
  color: #eee;
  z-index: 60;
}
#help-btn:hover { color: #fff; border-color: #888; }


/* ── game overlay (title / pause / game-over) ───────────────────────────── */

#overlay {
  position: absolute;
  inset: 0;
  background: rgba(10, 10, 10, 0.95);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  z-index: 10;
  padding: 20px;
  border-radius: 4px;
}

#overlay h2 {
  font-size: 20px;
  letter-spacing: 6px;
}

#overlay p {
  font-size: 10px;
  line-height: 2.2;
  color: #888;
  text-align: center;
}

#overlay button {
  padding: 9px 28px;
  font-family: monospace;
  font-size: 12px;
  letter-spacing: 3px;
  cursor: pointer;
  border-radius: 3px;
  border: 1px solid #444;
  background: #1a1a1a;
  color: #ccc;
}
#overlay button:hover { border-color: #888; color: #fff; }

.ov-btns { display: flex; gap: 10px; }
.ov-btns button { padding: 9px 22px; }
#overlay .ov-btns button.selected { border-color: #ffd60a; color: #ffd60a; }

/* ── title-screen mode toggle ───────────────────────────────────────────── */

#mode-toggle { display: flex; gap: 8px; }
#mode-toggle .gm-btn {
  padding: 7px 18px;
  font-family: monospace;
  font-size: 12px;
  letter-spacing: 2px;
  cursor: pointer;
  border-radius: 3px;
  border: 1px solid #444;
  background: #141414;
  color: #666;
}
#mode-toggle .gm-btn:hover { color: #aaa; border-color: #777; }
#mode-toggle .gm-btn.active,
#mode-toggle .gm-btn.active:hover { border-color: #ffd60a; color: #ffd60a; background: #1a1800; }

/* ── chain-combo pop ────────────────────────────────────────────────────── */

#combo {
  position: absolute;
  top: 35%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 22px;
  font-weight: bold;
  letter-spacing: 4px;
  pointer-events: none;
  opacity: 0;
  color: #ffd60a;
  z-index: 20;
  white-space: nowrap;
}
#combo.show { animation: cbpop 0.9s ease-out forwards; }
@keyframes cbpop {
  0%   { opacity: 1; transform: translate(-50%, -50%) scale(1.3); }
  65%  { opacity: 1; transform: translate(-50%, -65%) scale(1); }
  100% { opacity: 0; transform: translate(-50%, -85%) scale(0.8); }
}

/* ── score pop ──────────────────────────────────────────────────────────── */

#score-pop {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 20px;
  font-weight: bold;
  letter-spacing: 1px;
  pointer-events: none;
  opacity: 0;
  color: #fff;
  text-shadow: 0 0 8px rgba(255, 214, 10, 0.9), 0 2px 4px rgba(0, 0, 0, 0.8);
  z-index: 20;
  white-space: nowrap;
}
#score-pop.show { animation: scpop 0.95s ease-out forwards; }
@keyframes scpop {
  0%   { opacity: 0; transform: translate(-50%, -30%) scale(0.6); }
  18%  { opacity: 1; transform: translate(-50%, -50%) scale(1.15); }
  72%  { opacity: 1; transform: translate(-50%, -70%) scale(1); }
  100% { opacity: 0; transform: translate(-50%, -95%) scale(0.85); }
}

/* ── help modal ─────────────────────────────────────────────────────────── */

#help-modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  align-items: center;
  justify-content: center;
  z-index: 100;
}

#help-box {
  position: relative;
  background: #0d0d0d;
  border: 1px solid #333;
  border-radius: 6px;
  padding: 22px;
  width: 264px;
  max-width: 88vw;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.help-section { display: flex; flex-direction: column; gap: 6px; }

.help-cat {
  font-size: 9px;
  letter-spacing: 3px;
  color: #777;
  text-transform: uppercase;
  margin-bottom: 2px;
}

/* Two tight columns: the key/gesture sits right next to its action, so the eye
   doesn't have to travel across the box to pair them. */
.help-row {
  display: grid;
  grid-template-columns: 104px 1fr;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  color: #888;
}

.help-row .k { color: #ccc; white-space: nowrap; }
.help-row .a { color: #888; }

.help-row.goal {
  display: block;
  color: #999;
  line-height: 1.7;
}

.help-row kbd {
  font-family: monospace;
  color: #bbb;
  background: #1a1a1a;
  border: 1px solid #333;
  border-radius: 3px;
  padding: 1px 5px;
  font-size: 10px;
  white-space: nowrap;
}

#help-close {
  position: absolute;
  top: 10px;
  right: 12px;
  width: 28px;
  height: 28px;
  padding: 0;
  font-family: monospace;
  font-size: 16px;
  line-height: 1;
  cursor: pointer;
  border-radius: 3px;
  border: 1px solid #333;
  background: transparent;
  color: #666;
}
#help-close:hover { color: #ccc; border-color: #555; }

#reset-hi-btn {
  padding: 7px 16px;
  font-family: monospace;
  font-size: 11px;
  letter-spacing: 2px;
  cursor: pointer;
  border-radius: 3px;
  border: 1px solid #553333;
  background: #1a0d0d;
  color: #995555;
  align-self: center;
}
#reset-hi-btn:hover { color: #dd6666; border-color: #884444; }