:root {
  --bg: #08111f;
  --panel: #12223c;
  --text: #f3f7ff;
  --accent: #42d9a2;
  --danger: #ff5c7c;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  color: var(--text);
  background: radial-gradient(circle at top, #14345d, var(--bg) 45%);
}

.game-shell {
  width: min(95vw, 700px);
  text-align: center;
  background: linear-gradient(180deg, rgba(18, 34, 60, 0.95), rgba(10, 20, 37, 0.95));
  border: 2px solid rgba(66, 217, 162, 0.35);
  border-radius: 14px;
  padding: 14px;
  box-shadow: 0 16px 30px rgba(0, 0, 0, 0.35);
}

h1 {
  margin: 0 0 8px;
  font-size: 1.8rem;
}

.back-link {
  color: #a9ddff;
  text-decoration: none;
  font-size: 0.9rem;
}

.back-link:hover {
  text-decoration: underline;
}

.howto {
  margin: 0 auto 10px;
  text-align: left;
  background: rgba(7, 23, 40, 0.85);
  border: 1px solid rgba(173, 225, 255, 0.35);
  border-radius: 10px;
  padding: 8px 10px;
}

.howto summary {
  cursor: pointer;
  color: #d7f2ff;
  font-weight: 700;
  margin-bottom: 6px;
}

.howto p {
  margin: 4px 0;
  color: #dbe9ff;
  font-size: 0.88rem;
}

.start-menu {
  margin: 0 auto 10px;
  text-align: left;
  background: rgba(8, 19, 36, 0.8);
  border: 1px solid rgba(126, 242, 200, 0.35);
  border-radius: 10px;
  padding: 10px;
}

.start-menu h2 {
  margin: 0 0 8px;
  font-size: 1.1rem;
  color: #dcffe5;
}

.menu-grid {
  display: grid;
  grid-template-columns: 130px 1fr;
  align-items: center;
  gap: 8px;
}

.menu-grid label {
  font-size: 0.9rem;
  color: #d5e7ff;
}

.label-with-help {
  display: flex;
  align-items: center;
  gap: 6px;
}

.menu-grid select {
  width: 100%;
  font-size: 0.9rem;
  background: #132844;
  color: #f3f7ff;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 6px;
  padding: 6px;
}

.upgrade-row {
  margin-top: 10px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.shop-row {
  margin-top: 8px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
}

.control-help-wrap {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 6px;
}

.upgrade-row button,
.shop-row button,
.menu-actions button {
  cursor: pointer;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 6px;
  background: #1c3e62;
  color: #eff8ff;
  padding: 8px;
  font-size: 0.85rem;
}

.upgrade-row button:hover,
.shop-row button:hover,
.menu-actions button:hover {
  background: #275480;
}

.help-dot {
  width: 22px;
  height: 22px;
  padding: 0;
  border-radius: 999px;
  border: 1px solid rgba(173, 225, 255, 0.65);
  background: #15324f;
  color: #d9f7ff;
  font-weight: 700;
  cursor: help;
  position: relative;
}

.help-dot:hover,
.help-dot:focus-visible {
  background: #24527e;
  outline: none;
}

.help-dot::after {
  content: attr(data-tip);
  position: absolute;
  left: 50%;
  top: 125%;
  transform: translateX(-50%);
  width: 220px;
  text-align: left;
  font-size: 0.78rem;
  line-height: 1.25;
  color: #e7f5ff;
  background: rgba(6, 20, 36, 0.96);
  border: 1px solid rgba(173, 225, 255, 0.45);
  border-radius: 8px;
  padding: 6px 8px;
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.35);
  opacity: 0;
  pointer-events: none;
  z-index: 20;
}

.help-dot:hover::after,
.help-dot:focus-visible::after {
  opacity: 1;
}

body.help-mode .help-dot {
  box-shadow: 0 0 0 2px rgba(100, 214, 255, 0.45);
}

body.help-mode .help-dot::after {
  opacity: 1;
}

.save-stats {
  margin: 10px 0 0;
  color: #cde7da;
  font-size: 0.88rem;
}

.assist-row {
  margin-top: 10px;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 10px;
}

.tutorial-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #d7e8ff;
  font-size: 0.88rem;
}

.assist-row button {
  cursor: pointer;
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 6px;
  background: #1f4064;
  color: #f1f8ff;
  padding: 7px 10px;
  font-size: 0.84rem;
}

.assist-row button:hover {
  background: #2b5788;
}

.menu-actions {
  margin-top: 10px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.hint {
  margin: 0 0 10px;
  color: #c6d7ff;
  font-size: 0.95rem;
}

canvas {
  width: 100%;
  height: auto;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  background: linear-gradient(180deg, #040916 0%, #0d1e35 100%);
}

.tutorial-overlay {
  position: fixed;
  inset: 0;
  background: rgba(2, 8, 16, 0.72);
  display: grid;
  place-items: center;
  z-index: 60;
}

.tutorial-overlay.hidden {
  display: none;
}

.tutorial-card {
  width: min(90vw, 540px);
  background: linear-gradient(180deg, rgba(12, 27, 46, 0.98), rgba(8, 18, 33, 0.98));
  border: 1px solid rgba(152, 227, 255, 0.45);
  border-radius: 12px;
  padding: 14px;
  box-shadow: 0 18px 34px rgba(0, 0, 0, 0.45);
}

.tutorial-card h3 {
  margin: 0 0 8px;
  color: #e6f7ff;
}

.tutorial-card p {
  margin: 0;
  color: #d7e8ff;
  line-height: 1.35;
}

.tutorial-step {
  margin-top: 10px;
  font-size: 0.83rem;
  color: #9cd8ff;
}

.tutorial-actions {
  margin-top: 12px;
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

.tutorial-actions button {
  cursor: pointer;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 6px;
  padding: 7px 10px;
  background: #214666;
  color: #eef8ff;
}

@media (max-width: 640px) {
  .menu-grid {
    grid-template-columns: 1fr;
  }

  .upgrade-row {
    grid-template-columns: 1fr;
  }

  .shop-row {
    grid-template-columns: 1fr;
  }

  .assist-row {
    grid-template-columns: 1fr;
  }

  .menu-actions {
    grid-template-columns: 1fr;
  }
}