:root {
  color-scheme: dark;
  font-family: Inter, "Hiragino Sans", "Yu Gothic", sans-serif;
  color: #f4f7fb;
  background: #071525;
  --mint: #62e6bd;
  --moon: #ffe7a6;
  --red: #ff6b73;
  --green: #4ee0a3;
  --white: #f7fbff;
  --muted: #9eb0c4;
  --line: #274059;
  --panel: #10263d;
}

* { box-sizing: border-box; }

body {
  min-height: 100vh;
  margin: 0;
  background:
    radial-gradient(circle at 82% 8%, rgba(255, 231, 166, .16), transparent 22rem),
    radial-gradient(circle at 12% 88%, rgba(98, 230, 189, .12), transparent 18rem),
    #071525;
}

button, a { font: inherit; }
a { color: inherit; }

a:focus-visible,
button:focus-visible {
  outline: 3px solid #fff;
  outline-offset: 4px;
}

.site-header,
main {
  width: min(92vw, 1080px);
  margin-inline: auto;
}

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 68px;
  border-bottom: 1px solid var(--line);
}

.site-header a {
  color: var(--mint);
  font-size: .9rem;
  font-weight: 800;
  text-decoration: none;
}

.site-header p {
  margin: 0;
  color: var(--muted);
  font: 700 .72rem/1 ui-monospace, monospace;
  letter-spacing: .08em;
}

main {
  display: grid;
  grid-template-columns: minmax(220px, .5fr) minmax(0, 1.5fr);
  gap: clamp(1.4rem, 5vw, 3.5rem);
  padding: clamp(2.2rem, 6vw, 4.5rem) 0 3.5rem;
}

.eyebrow {
  margin: 0 0 .8rem;
  color: var(--mint);
  font: 800 .72rem/1 ui-monospace, monospace;
  letter-spacing: .14em;
}

h1 {
  margin: 0;
  font-size: clamp(3.1rem, 8vw, 5.8rem);
  line-height: .88;
  letter-spacing: -.07em;
}

h1 span { color: var(--mint); display: block; }

.intro p strong { color: #f4f7fb; }

.game-panel {
  padding: 1.2rem;
  border: 1px solid var(--line);
  border-radius: 1.3rem;
  background: rgba(16, 38, 61, .84);
}

.scoreboard {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: .5rem;
  margin: 0 0 1rem;
}

.scoreboard p {
  margin: 0;
  padding: .7rem .5rem;
  border-radius: .8rem;
  background: #0b1c2e;
  text-align: center;
}

.scoreboard span {
  display: block;
  color: var(--muted);
  font: 700 .68rem/1 ui-monospace, monospace;
  letter-spacing: .08em;
}

.scoreboard strong {
  display: block;
  margin-top: .35rem;
  font-size: 1.2rem;
}

.harbor {
  position: relative;
  overflow: hidden;
  min-height: 360px;
  padding: 1rem 1rem 1.2rem;
  border-radius: 1.1rem;
  background:
    linear-gradient(#0b1d33, #12324d 42%, #0d4c58 100%);
}

.sky {
  position: absolute;
  inset: 0 auto auto 0;
  width: 100%;
  height: 42%;
  background:
    radial-gradient(circle at 86% 22%, rgba(255,231,166,.55) 0 12px, transparent 13px),
    radial-gradient(circle at 18% 30%, rgba(255,255,255,.45) 0 2px, transparent 3px),
    radial-gradient(circle at 40% 18%, rgba(255,255,255,.35) 0 1.5px, transparent 2px);
  pointer-events: none;
}

.burapi {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: end;
  gap: .7rem;
  margin-bottom: .8rem;
}

.burapi img {
  width: 72px;
  height: 72px;
  object-fit: contain;
  image-rendering: pixelated;
  filter: drop-shadow(0 8px 12px rgba(0,0,0,.35));
}

.burapi p {
  margin: 0;
  padding: .55rem .75rem;
  border-radius: 1rem 1rem 1rem .2rem;
  background: #10263d;
  color: #e8f7f1;
  font-size: .92rem;
  line-height: 1.5;
}

.ship {
  position: relative;
  z-index: 1;
  min-height: 92px;
  margin-bottom: .85rem;
  padding: .85rem 1rem;
  border-radius: .9rem;
  background: rgba(7, 21, 37, .55);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.08);
  transform: translateX(var(--drift, 0%));
  transition: transform 80ms linear;
}

.ship-label {
  margin: 0;
  color: var(--moon);
  font: 700 .7rem/1 ui-monospace, monospace;
  letter-spacing: .1em;
}

.phase {
  margin: .35rem 0 .55rem;
  color: #fff;
  font-size: 1.05rem;
  font-weight: 850;
}

.phase.is-memorize { color: var(--moon); }
.phase.is-play { color: var(--mint); }

.signal-preview {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.signal-preview li {
  position: relative;
  display: grid;
  place-items: center;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 999px;
  color: #081525;
  font-weight: 850;
  box-shadow: 0 0 12px currentColor;
}

.signal-preview li + li::before {
  content: "→";
  position: absolute;
  left: -0.85rem;
  color: #ffe7a6;
  font-size: .85rem;
  text-shadow: none;
  box-shadow: none;
}

.signal-preview .step {
  position: relative;
  z-index: 1;
  font: 850 .9rem/1 ui-monospace, monospace;
}

.signal-preview .red { background: var(--red); color: var(--red); }
.signal-preview .white { background: var(--white); color: var(--white); }
.signal-preview .green { background: var(--green); color: var(--green); }
.signal-preview .red .step,
.signal-preview .white .step,
.signal-preview .green .step { color: #081525; }
.signal-preview.is-hidden li {
  background: #163044;
  color: #dce8f4;
  box-shadow: inset 0 0 0 2px #3d5670;
}
.signal-preview.is-hidden .step { color: #f4f7fb; }
.signal-preview.is-hidden .is-next {
  box-shadow: 0 0 0 3px var(--mint);
}
.signal-preview.is-hidden li + li::before { color: var(--muted); }
.signal-preview.is-hidden .is-done.red {
  background: var(--red);
  color: var(--red);
  box-shadow: 0 0 12px currentColor;
}
.signal-preview.is-hidden .is-done.white {
  background: var(--white);
  color: var(--white);
  box-shadow: 0 0 12px currentColor;
}
.signal-preview.is-hidden .is-done.green {
  background: var(--green);
  color: var(--green);
  box-shadow: 0 0 12px currentColor;
}
.signal-preview.is-hidden .is-done .step { color: #081525; }
.signal-preview .mark {
  position: absolute;
  right: -0.15rem;
  bottom: -0.35rem;
  z-index: 2;
  min-width: 1.15rem;
  padding: .08rem .2rem;
  border-radius: 999px;
  background: #071525;
  color: var(--mint);
  font: 800 .58rem/1 ui-monospace, monospace;
  box-shadow: 0 0 0 1px var(--mint);
}

.tide {
  display: grid;
  gap: .35rem;
  margin-bottom: 1rem;
  color: var(--muted);
  font-size: .75rem;
}

progress {
  width: 100%;
  height: .7rem;
  border: 0;
  border-radius: 999px;
  overflow: hidden;
  background: #163044;
}

progress::-webkit-progress-bar { background: #163044; }
progress::-webkit-progress-value { background: var(--mint); }
progress::-moz-progress-bar { background: var(--mint); }

.lanterns {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: .65rem;
}

.lantern {
  position: relative;
  min-height: 92px;
  padding: 1.1rem .4rem .7rem;
  border: 0;
  border-radius: 1rem;
  color: #081525;
  font-weight: 850;
  cursor: pointer;
}

.lantern:disabled { cursor: not-allowed; opacity: .55; }

.lantern-red { background: #ffd0d3; }
.lantern-white { background: #eef4ff; }
.lantern-green { background: #c8f6e3; }

.lantern .glow {
  display: block;
  width: 1.35rem;
  height: 1.35rem;
  margin: 0 auto .45rem;
  border-radius: 999px;
  background: currentColor;
  box-shadow: 0 0 0 0 currentColor;
}

.lantern-red .glow { color: var(--red); }
.lantern-white .glow { color: #9bbcff; }
.lantern-green .glow { color: var(--green); }

.lantern.is-lit .glow {
  box-shadow: 0 0 22px 6px currentColor;
}

.lantern.is-last {
  box-shadow: 0 0 0 3px #ffe7a6;
}

.lantern.is-last::after {
  content: "いま";
  position: absolute;
  right: .4rem;
  top: .4rem;
  left: auto;
  color: #081525;
  font: 800 .62rem/1 ui-monospace, monospace;
  letter-spacing: .04em;
}

.lantern kbd {
  display: block;
  margin-top: .35rem;
  color: #4a5d72;
  font: 700 .72rem/1 ui-monospace, monospace;
}

.status {
  min-height: 1.5em;
  margin: 1rem 0 .8rem;
  color: #dce8f4;
  font-weight: 700;
}

.actions { display: flex; flex-wrap: wrap; gap: .6rem; }

.action,
.ghost {
  min-height: 48px;
  padding: 0 1.15rem;
  border-radius: 999px;
  font-weight: 850;
  cursor: pointer;
}

.action {
  border: 0;
  background: var(--mint);
  color: #071525;
}

.ghost {
  border: 2px solid var(--mint);
  background: transparent;
  color: var(--mint);
}

.key-hint {
  margin: .8rem 0 0;
  color: var(--muted);
  font-size: .82rem;
  line-height: 1.6;
}

kbd {
  display: inline-block;
  padding: .05rem .35rem;
  border: 1px solid #3d5670;
  border-radius: .35rem;
  background: #10263d;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 840px) {
  main { grid-template-columns: 1fr; }
  .intro { position: static; }
  .scoreboard { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 520px) {
  .lanterns { gap: .4rem; }
  .burapi img { width: 60px; height: 60px; }
}

@media (prefers-reduced-motion: reduce) {
  .ship { transition: none; }
}

.share-x {
  min-height: 48px;
  padding: 0 1.15rem;
  border: 0;
  border-radius: 999px;
  background: #1c3348;
  color: #fff4ea;
  font-weight: 850;
  cursor: pointer;
}
.share-x[hidden] { display: none !important; }