:root {
  color-scheme: dark;
  --bg-1: #120712;
  --bg-2: #261127;
  --panel: rgba(20, 10, 22, 0.88);
  --panel-border: rgba(255, 120, 174, 0.2);
  --text: #ffe7f1;
  --muted: #c9a7ba;
  --accent: #ff4f93;
  --accent-2: #ff8fb7;
  --theme-tab-bg: rgba(255, 255, 255, 0.04);
  --theme-tab-active: rgba(255, 79, 147, 0.2);
  --theme-tab-border: rgba(255, 255, 255, 0.08);
  --theme-tab-glow: rgba(255, 79, 147, 0.28);
  --chip-bg: rgba(18, 10, 26, 0.58);
  --chip-border: rgba(255, 255, 255, 0.08);
  --board-glow: rgba(255, 79, 147, 0.08);
  --board-top-glow: rgba(255, 68, 129, 0.16);
  --board-shadow: 0 24px 60px rgba(0, 0, 0, 0.42);
  --status-flash: #ffd8a8;
  --status-flash-shadow: rgba(255, 192, 132, 0.55);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top, color-mix(in srgb, var(--accent) 35%, transparent), transparent 30%),
    linear-gradient(180deg, var(--bg-2), var(--bg-1) 48%, #09050b);
  color: var(--text);
}

body {
  min-height: 100vh;
  min-height: 100dvh;
}

.app {
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: 6px 12px 8px;
}

.panel {
  width: min(100%, 780px);
  max-height: calc(100dvh - 12px);
  padding: 18px 20px 14px;
  border: 1px solid var(--panel-border);
  border-radius: 34px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.01)),
    var(--panel);
  box-shadow: var(--board-shadow);
  backdrop-filter: blur(12px);
  overflow: hidden;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9rem;
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.04);
  transition:
    color 120ms ease,
    border-color 120ms ease,
    background 120ms ease,
    transform 120ms ease;
}

.back-link:hover {
  color: var(--text);
  border-color: color-mix(in srgb, var(--accent) 30%, rgba(255, 255, 255, 0.08));
  background: color-mix(in srgb, var(--accent) 12%, rgba(255, 255, 255, 0.04));
}

.back-link:active {
  transform: translateY(1px);
}

.eyebrow,
.overlay__eyebrow {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.82rem;
  color: var(--accent-2);
}

h1,
h2,
.legend,
#game-over-copy,
#start-copy,
.board-chip__label {
  margin: 0;
}

h1 {
  margin-top: 12px;
  font-size: clamp(2.8rem, 6.4vw, 4.2rem);
  line-height: 0.94;
  text-align: center;
}

.theme-switcher {
  margin-top: 12px;
}

.theme-rail {
  position: relative;
  padding: 12px 0 10px;
}

.theme-rail::before,
.theme-rail::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent,
    color-mix(in srgb, var(--accent) 45%, rgba(255, 255, 255, 0.1)),
    transparent
  );
}

.theme-rail::before {
  top: 0;
}

.theme-rail::after {
  bottom: 0;
}

.theme-tabs {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding: 6px 2px;
  scrollbar-width: thin;
}

.theme-tab {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  border-radius: 999px;
  border: 1px solid var(--theme-tab-border);
  background: var(--theme-tab-bg);
  color: var(--muted);
  cursor: pointer;
  transition:
    background 120ms ease,
    color 120ms ease,
    border-color 120ms ease,
    transform 120ms ease;
}

.theme-tab.is-active {
  color: var(--text);
  background:
    radial-gradient(circle at center, color-mix(in srgb, var(--accent) 22%, transparent), transparent 70%),
    linear-gradient(180deg, var(--theme-tab-active), rgba(255, 255, 255, 0.06));
  border-color: color-mix(in srgb, var(--accent) 40%, rgba(255, 255, 255, 0.1));
  box-shadow:
    inset 0 0 0 1px color-mix(in srgb, var(--accent-2) 15%, transparent),
    0 0 0 1px color-mix(in srgb, var(--accent) 16%, transparent),
    0 0 26px var(--theme-tab-glow);
}

.theme-tab:active {
  transform: translateY(1px);
}

.board-wrap {
  position: relative;
  margin-top: 12px;
  width: min(100%, calc(100dvh - 260px), 520px);
  margin-inline: auto;
}

.board-hud {
  position: absolute;
  top: 14px;
  left: 14px;
  z-index: 2;
  display: flex;
  gap: 10px;
  pointer-events: none;
}

.board-chip {
  min-width: 90px;
  padding: 9px 11px;
  border-radius: 16px;
  background: var(--chip-bg);
  border: 1px solid var(--chip-border);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.18);
  backdrop-filter: blur(10px);
}

.board-chip--status {
  min-width: 150px;
}

.board-chip__label {
  display: block;
  color: var(--muted);
  font-size: 0.76rem;
}

.board-chip strong {
  display: block;
  margin-top: 4px;
  font-size: 1rem;
}

canvas {
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  display: block;
  border-radius: 30px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.03), transparent),
    repeating-linear-gradient(
      0deg,
      rgba(255, 255, 255, 0.03) 0,
      rgba(255, 255, 255, 0.03) 1px,
      transparent 1px,
      transparent 21px
    ),
    repeating-linear-gradient(
      90deg,
      rgba(255, 255, 255, 0.03) 0,
      rgba(255, 255, 255, 0.03) 1px,
      transparent 1px,
      transparent 21px
    ),
    radial-gradient(circle at top, var(--board-top-glow), transparent 40%),
    #140b17;
  box-shadow:
    inset 0 0 50px var(--board-glow),
    0 20px 35px rgba(0, 0, 0, 0.38);
}

.board-wrap--flash canvas {
  box-shadow:
    inset 0 0 70px color-mix(in srgb, var(--accent) 25%, transparent),
    0 0 0 1px color-mix(in srgb, var(--accent-2) 30%, transparent),
    0 18px 40px rgba(0, 0, 0, 0.4),
    0 0 28px color-mix(in srgb, var(--accent) 30%, transparent);
}

.overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 24px;
  border-radius: 30px;
  background: rgba(4, 1, 6, 0.62);
}

.hidden {
  display: none;
}

.overlay__card {
  width: min(100%, 340px);
  padding: 24px 22px;
  text-align: center;
  border-radius: 24px;
  background: rgba(18, 7, 18, 0.94);
  border: 1px solid color-mix(in srgb, var(--accent-2) 22%, transparent);
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.35);
}

#game-over-copy,
#start-copy {
  margin-top: 10px;
  color: var(--muted);
  line-height: 1.45;
}

.countdown {
  margin-top: 16px;
  color: var(--status-flash);
  font-size: 2rem;
  font-weight: 700;
  text-shadow: 0 0 18px var(--status-flash-shadow);
}

button {
  margin-top: 18px;
  padding: 13px 22px;
  border: 0;
  border-radius: 999px;
  font: inherit;
  font-weight: 700;
  color: #fff5fb;
  cursor: pointer;
  background: linear-gradient(180deg, var(--accent), color-mix(in srgb, var(--accent) 74%, black));
  box-shadow: 0 12px 28px color-mix(in srgb, var(--accent) 26%, transparent);
}

.legend {
  margin-top: 12px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-size: 0.82rem;
}

.legend strong {
  color: var(--text);
}

@media (max-width: 720px) {
  .panel {
    padding-inline: 14px;
    border-radius: 28px;
  }

  .back-link {
    font-size: 0.82rem;
    padding: 7px 10px;
  }

  .board-wrap {
    width: min(100%, calc(100dvh - 246px), 460px);
  }

  .board-hud {
    flex-wrap: wrap;
  }

  .legend {
    flex-direction: column;
  }
}

@media (max-height: 900px) {
  .panel {
    padding-top: 16px;
    padding-bottom: 12px;
  }

  h1 {
    font-size: clamp(2.4rem, 5.8vw, 3.7rem);
  }

  .board-wrap {
    width: min(100%, calc(100dvh - 286px), 460px);
  }
}