:root {
  --bg: #070c12;
  --panel-bg: #0d141d;
  --panel-line: #1e2a38;
  --ink: #e8eef6;
  --ink-dim: #8ea1b8;
  --accent: #ffb454;
  --accent-2: #4fd0e0;
  --ocean: #12283f;
  --zone: #7ee081;
  --radius: 10px;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--ink);
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic", system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
}

.app {
  display: grid;
  grid-template-columns: 316px 1fr;
  height: 100%;
}

/* ---------- パネル ---------- */
.panel {
  background: var(--panel-bg);
  border-right: 1px solid var(--panel-line);
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 20px 18px 28px;
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.panel__head h1 {
  margin: 0 0 6px;
  font-size: 19px;
  letter-spacing: .02em;
  font-weight: 700;
}
.panel__head h1 em {
  font-style: normal;
  color: var(--accent);
}
.tagline {
  margin: 0;
  font-size: 12px;
  line-height: 1.6;
  color: var(--ink-dim);
}

.block h2 {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink-dim);
  font-weight: 700;
}

/* ---------- 読み取り値 ---------- */
.readout {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
  margin-bottom: 12px;
}
.readout__item {
  background: #101a25;
  border: 1px solid var(--panel-line);
  border-radius: var(--radius);
  padding: 8px 6px;
  text-align: center;
}
.readout__label {
  display: block;
  font-size: 10px;
  color: var(--ink-dim);
  margin-bottom: 3px;
}
.readout__value {
  display: block;
  font-size: 13px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--accent-2);
}

.globe {
  display: block;
  margin: 0 auto;
  width: 150px;
  height: 150px;
  cursor: grab;
}

/* ---------- スライダー ---------- */
.slider {
  display: block;
  margin-bottom: 12px;
}
.slider > span {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--ink-dim);
  margin-bottom: 5px;
}
.slider b {
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}
input[type="range"] {
  width: 100%;
  height: 4px;
  appearance: none;
  background: #22303f;
  border-radius: 3px;
  outline: none;
}
input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid #0d141d;
  cursor: pointer;
}
input[type="range"]::-moz-range-thumb {
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid #0d141d;
  cursor: pointer;
}

/* ---------- ボタン ---------- */
.btn-row {
  display: flex;
  gap: 8px;
  margin-top: 12px;
}
.btn {
  flex: 1;
  padding: 8px 10px;
  font: inherit;
  font-size: 12px;
  color: var(--ink);
  background: #16212e;
  border: 1px solid var(--panel-line);
  border-radius: var(--radius);
  cursor: pointer;
  transition: background .15s, border-color .15s;
}
.btn:hover { background: #1d2b3a; border-color: #2c3e52; }
.btn--accent[aria-pressed="true"] {
  background: var(--accent);
  border-color: var(--accent);
  color: #1a1206;
  font-weight: 700;
}

/* ---------- チップ ---------- */
.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.chip {
  padding: 6px 10px;
  font: inherit;
  font-size: 12px;
  color: var(--ink);
  background: #16212e;
  border: 1px solid var(--panel-line);
  border-radius: 999px;
  cursor: pointer;
  transition: background .15s, color .15s, border-color .15s;
}
.chip:hover { background: var(--accent); color: #1a1206; border-color: var(--accent); }
.chip--active { background: #22354a; border-color: var(--accent-2); color: var(--accent-2); }

/* ---------- チェック ---------- */
.checks {
  display: grid;
  gap: 8px;
}
.check {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  color: var(--ink-dim);
  cursor: pointer;
}
.check input { accent-color: var(--accent); width: 14px; height: 14px; }
.check:hover { color: var(--ink); }

.panel__foot {
  margin-top: auto;
  border-top: 1px solid var(--panel-line);
  padding-top: 14px;
  font-size: 11px;
  line-height: 1.7;
  color: var(--ink-dim);
}
.panel__foot p { margin: 0 0 6px; }
.panel__foot b { color: var(--ink); }
kbd {
  background: #16212e;
  border: 1px solid var(--panel-line);
  border-radius: 4px;
  padding: 0 4px;
  font-size: 10px;
}
.credit { opacity: .7; }

/* ---------- 地図 ---------- */
.stage {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(120% 120% at 50% 0%, #0e1723 0%, var(--bg) 70%);
}
.map {
  display: block;
  width: 100%;
  height: 100%;
  cursor: grab;
  touch-action: none;
}
.map:active { cursor: grabbing; }

.hud {
  position: absolute;
  left: 0;
  top: 0;
  pointer-events: none;
  background: rgba(8, 14, 21, .88);
  border: 1px solid var(--panel-line);
  border-radius: 8px;
  padding: 6px 9px;
  font-size: 12px;
  line-height: 1.5;
  white-space: nowrap;
  transform: translate(14px, 14px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, .45);
}
.hud b { color: var(--accent); }
.hud small.hud__utm { color: var(--zone); font-weight: 600; }
.hud small.hud__warn { color: var(--accent); }
.hud small {
  display: block;
  color: var(--ink-dim);
  font-variant-numeric: tabular-nums;
  font-size: 11px;
}

.panel-toggle {
  display: none;
  position: absolute;
  top: 12px;
  left: 12px;
  width: 38px;
  height: 38px;
  font-size: 16px;
  color: var(--ink);
  background: rgba(13, 20, 29, .92);
  border: 1px solid var(--panel-line);
  border-radius: var(--radius);
  cursor: pointer;
  z-index: 5;
}

/* ---------- レスポンシブ ---------- */
@media (max-width: 820px) {
  .app { grid-template-columns: 1fr; }
  .panel {
    position: absolute;
    inset: 0 auto 0 0;
    width: min(316px, 88vw);
    z-index: 10;
    transform: translateX(-100%);
    transition: transform .22s ease;
    box-shadow: 0 0 40px rgba(0, 0, 0, .6);
  }
  .panel.is-open { transform: none; }
  .panel-toggle { display: block; }
  .stage { grid-column: 1; grid-row: 1; }
}

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

/* ---------- モード切替 ---------- */
.seg {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 4px;
  padding: 4px;
  background: #101a25;
  border: 1px solid var(--panel-line);
  border-radius: var(--radius);
}
.seg__btn {
  padding: 7px 4px;
  font: inherit;
  font-size: 11.5px;
  font-weight: 600;
  color: var(--ink-dim);
  background: transparent;
  border: 0;
  border-radius: 7px;
  cursor: pointer;
  transition: background .15s, color .15s;
}
.seg__btn:hover { color: var(--ink); }
.seg__btn[aria-checked="true"] {
  background: var(--accent);
  color: #1a1206;
}
.note {
  margin: 10px 0 0;
  font-size: 11.5px;
  line-height: 1.65;
  color: var(--ink-dim);
}
.note b { color: var(--ink); }

/* モードごとの出し分け。
   .only を付けた要素は、現在のモードに対応する .only-<mode> が無ければ隠す。
   display を上書きしないので、元の flex / grid などがそのまま生きる。 */
body[data-mode="mercator"] .only:not(.only-mercator),
body[data-mode="utm"] .only:not(.only-utm),
body[data-mode="ee"] .only:not(.only-ee) { display: none !important; }

/* ---------- ゾーン表示 ---------- */
.zonecard {
  display: flex;
  align-items: center;
  gap: 12px;
  background: #101a25;
  border: 1px solid var(--panel-line);
  border-radius: var(--radius);
  padding: 10px 12px;
  margin-bottom: 12px;
}
.zonecard__zone {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-right: 12px;
  border-right: 1px solid var(--panel-line);
}
.zonecard__label {
  font-size: 10px;
  color: var(--ink-dim);
}
.zonecard__zone b {
  font-size: 22px;
  line-height: 1.15;
  font-variant-numeric: tabular-nums;
  color: var(--zone);
}
.zonecard__meta {
  display: flex;
  flex-direction: column;
  gap: 3px;
  font-size: 11.5px;
  color: var(--ink-dim);
}
.zonecard__meta b {
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}
.zonecard__snap { color: var(--accent); min-height: 1em; }