:root {
  --ink: #24302c;
  --muted: #6c786f;
  --cream: rgba(255, 250, 236, 0.92);
  --cream-strong: #fff9eb;
  --sage: #6f987f;
  --deep-sage: #34584e;
  --apricot: #f2b38d;
  --rose: #ef9aa7;
  --butter: #ffe7a8;
  --aqua: #9bd7cd;
  --shadow: rgba(29, 45, 48, 0.22);
  --button-border: rgba(52, 88, 78, 0.18);
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  font-family: "Microsoft YaHei UI", "Yu Gothic UI", "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at 13% 18%, rgba(255, 231, 168, 0.82), transparent 22rem),
    radial-gradient(circle at 86% 16%, rgba(155, 215, 205, 0.56), transparent 24rem),
    radial-gradient(circle at 48% 110%, rgba(239, 154, 167, 0.28), transparent 28rem),
    linear-gradient(145deg, #edf2dd 0%, #d4e4d7 44%, #adcfc8 100%);
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  content: "";
  opacity: 0.36;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.42) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.42) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: radial-gradient(circle at center, black, transparent 82%);
}

.shell {
  width: min(1200px, calc(100vw - 28px));
  margin: 0 auto;
  padding: 34px 0 42px;
}

.hero {
  display: grid;
  gap: 10px;
  margin-bottom: 20px;
  text-align: center;
}

.eyebrow {
  margin: 0;
  color: var(--deep-sage);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(38px, 7vw, 78px);
  line-height: 0.95;
  letter-spacing: 0;
  text-shadow: 0 2px 8px rgba(36, 48, 44, 0.1);
}

.intro {
  max-width: 820px;
  margin: 0 auto;
  padding: 0 12px;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.8;
}

.game-card {
  padding: 16px;
  border: 1px solid rgba(255, 255, 255, 0.68);
  border-radius: 8px;
  background: rgba(255, 250, 236, 0.72);
  box-shadow: 0 26px 90px var(--shadow);
  backdrop-filter: blur(18px);
}

.topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

button,
select {
  color: var(--ink);
  font: inherit;
}

button {
  border: 0;
  cursor: pointer;
}

select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid rgba(52, 88, 78, 0.18);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.72);
}

.nav-button,
.audio-button,
.panel button {
  min-height: 46px;
  padding: 11px 17px;
  border: 1px solid var(--button-border);
  border-radius: 8px;
  color: #2b463f;
  font-weight: 800;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.86), rgba(255, 250, 236, 0.76));
  box-shadow: 0 6px 16px rgba(52, 88, 78, 0.08);
  transition: transform 160ms ease, background 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}

.nav-button:hover,
.audio-button:hover,
.panel button:hover {
  transform: translateY(-1px);
  border-color: rgba(52, 88, 78, 0.28);
  background: linear-gradient(180deg, #fffdf4, #f8f0d9);
  box-shadow: 0 10px 22px rgba(52, 88, 78, 0.16);
}

.nav-button.is-active,
.audio-button.is-active {
  color: white;
  border-color: rgba(52, 88, 78, 0.56);
  background: linear-gradient(180deg, #42695f, var(--deep-sage));
  box-shadow: 0 10px 24px rgba(52, 88, 78, 0.22);
}

.audio-button {
  margin-left: auto;
  padding-inline: 20px;
  color: #68482f;
  border-color: rgba(201, 128, 80, 0.28);
  background: linear-gradient(180deg, #fff9eb, #ffe3bd);
}

.audio-button::before {
  content: "♪";
  margin-right: 8px;
  font-weight: 900;
}

.audio-button.is-active {
  color: white;
  border-color: rgba(52, 88, 78, 0.56);
  background: linear-gradient(180deg, #709b82, #34584e);
}

.stage {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 14px;
}

.stage.is-wide {
  grid-template-columns: 1fr;
}

canvas {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 13 / 8;
  border-radius: 12px;
  background: #9bd7cd;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.34);
  cursor: crosshair;
}

.panel {
  display: grid;
  align-content: start;
  gap: 14px;
  min-height: 360px;
  padding: 18px;
  border-radius: 8px;
  background: linear-gradient(180deg, rgba(255, 250, 236, 0.96), rgba(246, 252, 232, 0.9));
  box-shadow: inset 0 0 0 1px rgba(52, 88, 78, 0.12);
}

.panel h2 {
  margin: 0;
  font-size: 22px;
  line-height: 1.25;
}

.panel label {
  display: grid;
  gap: 8px;
  margin: 0;
  color: var(--deep-sage);
  font-size: 14px;
  font-weight: 800;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--sage);
}

.panel button {
  width: 100%;
  background: var(--cream-strong);
}

.panel button:disabled {
  cursor: not-allowed;
  opacity: 0.58;
  transform: none;
  box-shadow: none;
}

.hint {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}

.message {
  min-height: 48px;
  margin-top: 14px;
  padding: 14px 16px;
  border-radius: 8px;
  color: #405348;
  line-height: 1.65;
  background: rgba(255, 255, 255, 0.62);
}

.controls {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-top: 14px;
  color: var(--muted);
  font-size: 14px;
}

.controls p {
  margin: 0;
  padding: 10px 14px;
  border-radius: 8px;
  background: rgba(255, 250, 238, 0.72);
}

kbd {
  padding: 3px 8px;
  border: 1px solid rgba(37, 49, 45, 0.18);
  border-radius: 8px;
  color: #2f4f47;
  background: rgba(255, 255, 255, 0.72);
  box-shadow: 0 2px 0 rgba(37, 49, 45, 0.12);
}

@media (max-width: 940px) {
  .stage {
    grid-template-columns: 1fr;
  }

  .panel {
    min-height: auto;
  }
}

@media (max-width: 640px) {
  .shell {
    width: min(100vw - 16px, 1200px);
    padding-top: 22px;
  }

  .hero {
    gap: 8px;
  }

  .intro {
    font-size: 16px;
    line-height: 1.75;
  }

  .game-card {
    padding: 10px;
    border-radius: 8px;
  }

  .topbar {
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .audio-button {
    margin-left: 0;
  }
}