:root {
  --sky: #bfe7f5;
  --wave: rgba(255, 255, 255, 0.5);
  --water: #2a7fb8;
  --deep: #14466e;
  --ink: #1c2b36;
  --coin: #f5b400;
  --surface: #ffffff;
  --muted: #5c7284;
  --accent: #e04b4b;
  --radius: 12px;
  /* semantic theme tokens (design system) */
  --foreground: var(--ink);
  --muted-foreground: var(--muted);
  --primary: var(--water);
  --primary-foreground: #ffffff;
  --radius-lg: 16px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: system-ui, -apple-system, 'Segoe UI', sans-serif;
  color: var(--ink);
  background: linear-gradient(180deg, var(--sky) 0%, #e8f6fb 100%);
  min-height: 100vh;
}

.stage {
  max-width: 760px;
  margin: 0 auto;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

h1 {
  font-size: 20px;
  margin: 4px 0;
  line-height: 1.2;
}

.hud {
  display: flex;
  gap: 8px;
  align-items: center;
}

.hud-item {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 8px 14px;
  font-size: 20px;
  font-weight: 700;
  display: flex;
  align-items: baseline;
  gap: 6px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.15);
}

.hud-label {
  font-size: 12px;
  font-weight: 500;
  color: var(--muted);
}

.coin-icon { color: var(--coin); font-size: 16px; }

.playfield {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
  touch-action: manipulation;
}

#gameCanvas {
  display: block;
  width: 100%;
  height: auto;
}

.game-over {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  background: rgba(20, 50, 75, 0.85);
  color: #fff;
  text-align: center;
  padding: 16px;
}

.game-over.hidden, .catch-popup.hidden { display: none; }

.game-over h2 { margin: 0; font-size: 28px; }
.final-coins { font-size: 22px; font-weight: 700; margin: 0; }
.best-line { color: #cfe6f2; margin: 0 0 8px; }

#restartBtn {
  font-size: 18px;
  font-weight: 700;
  padding: 12px 32px;
  min-height: 44px;
  border: none;
  border-radius: var(--radius);
  background: var(--coin);
  color: var(--ink);
  cursor: pointer;
}

#restartBtn:hover { filter: brightness(1.05); }
#restartBtn:focus-visible { outline: 3px solid #fff; }

.catch-popup {
  position: absolute;
  background: var(--surface);
  color: var(--ink);
  font-weight: 700;
  font-size: 15px;
  padding: 6px 12px;
  border-radius: var(--radius);
  box-shadow: 0 2px 6px rgba(0,0,0,0.25);
  pointer-events: none;
  transition: opacity 0.1s linear;
}

.controls-help p {
  margin: 0;
  font-size: 14px;
  color: var(--muted);
  text-align: center;
}

.game-heading {
  font-size: 20px;
  margin: 4px 0;
  line-height: 1.2;
}

.catch-log-form {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 10px 12px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.catch-log-form label { font-size: 14px; }

.catch-log-form input {
  flex: 1;
  min-width: 140px;
  min-height: 44px;
  padding: 8px 10px;
  font-size: 15px;
  border: 1px solid #c3d6e0;
  border-radius: 8px;
}

.catch-log-form button {
  min-height: 44px;
  padding: 8px 16px;
  font-size: 15px;
  font-weight: 600;
  border: none;
  border-radius: 8px;
  background: var(--water);
  color: #fff;
  cursor: pointer;
}

.catch-log-form button:focus-visible,
.catch-log-form input:focus-visible { outline: 3px solid var(--water); }

.catch-log {
  width: 100%;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.catch-log li {
  background: #eef6fa;
  border-radius: 8px;
  padding: 4px 10px;
}

@media (max-width: 480px) {
  .start-title { font-size: 26px; }
  .hud-item { font-size: 16px; padding: 6px 10px; }
  .catch-popup { font-size: 13px; }
}

/* ---- Start Screen (approved design) ---- */
.start-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 14px;
  min-height: 520px;
  padding: 24px 16px;
}

.start-title {
  margin: 0;
  font-size: 36px;
  line-height: 1.15;
  font-weight: 700;
  color: var(--foreground);
  max-width: 22ch;
}

.start-subtitle {
  margin: 0;
  font-size: 20px;
  color: var(--muted-foreground);
  max-width: 30ch;
}

.start-play-btn {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  min-height: 44px;
  border: none;
  border-radius: var(--radius-lg);
  background: var(--primary);
  color: var(--primary-foreground);
  font-size: 18px;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(20, 70, 110, 0.3);
  transition: transform 0.15s ease-out, filter 0.15s ease-out;
}

.start-play-btn:hover { filter: brightness(1.08); transform: translateY(-1px); }
.start-play-btn:active { transform: translateY(0); }
.start-play-btn:focus-visible { outline: 3px solid var(--coin); outline-offset: 2px; }

.start-play-icon {
  display: inline-block;
  width: 0;
  height: 0;
  border-top: 9px solid transparent;
  border-bottom: 9px solid transparent;
  border-left: 14px solid var(--primary-foreground);
}

.start-controls-hint {
  margin: 8px 0 0;
  font-size: 16px;
  color: var(--muted-foreground);
}

.hidden-screen { display: none; }

@media (max-width: 480px) {
  .start-title { font-size: 26px; }
  .start-subtitle { font-size: 17px; }
}

@media (prefers-reduced-motion: reduce) {
  .catch-popup { transition: none; }
  .start-play-btn { transition: none; }
}