:root {
  color-scheme: dark;
  --bg-0: #04070d;
  --bg-1: #0b1524;
  --glass: rgba(9, 16, 26, 0.72);
  --glass-strong: rgba(8, 14, 23, 0.88);
  --line: rgba(150, 190, 225, 0.16);
  --line-strong: rgba(150, 200, 240, 0.3);
  --text: #eaf3fb;
  --muted: #93a9bd;
  --accent: #62d7ff;
  --accent-warm: #ffc46b;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  background: var(--bg-0);
}

body {
  font-family:
    Inter, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", ui-sans-serif,
    system-ui, -apple-system, "Segoe UI", sans-serif;
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}

#app {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background:
    radial-gradient(ellipse 70% 55% at 62% 34%, #101f33 0%, rgba(9, 16, 28, 0) 62%),
    radial-gradient(ellipse 120% 100% at 50% 50%, #060b14 0%, #03060b 100%);
}

#scene {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  cursor: grab;
  touch-action: none;
}

#scene.is-dragging {
  cursor: grabbing;
}

/* ---------- 城市标签 ---------- */

.labels {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.label {
  position: absolute;
  left: 0;
  top: 0;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px 3px 7px;
  border: 1px solid rgba(150, 200, 240, 0.22);
  border-radius: 4px;
  background: rgba(7, 13, 22, 0.62);
  color: #d9e8f5;
  font: inherit;
  font-size: 12px;
  line-height: 1.4;
  white-space: nowrap;
  letter-spacing: 0;
  pointer-events: auto;
  cursor: pointer;
  transform: translate(-50%, -50%);
  transition:
    border-color 160ms ease,
    color 160ms ease,
    background-color 160ms ease;
  will-change: transform, opacity;
}

.label::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent-warm);
  box-shadow: 0 0 6px rgba(255, 196, 107, 0.85);
}

.label:hover {
  border-color: var(--line-strong);
  background: rgba(12, 22, 34, 0.86);
  color: #fff;
}

.label.is-active {
  border-color: rgba(98, 215, 255, 0.7);
  background: rgba(10, 26, 38, 0.92);
  color: #fff;
}

.label.is-active::before {
  background: var(--accent);
  box-shadow: 0 0 8px rgba(98, 215, 255, 0.9);
}

.labels.is-hidden {
  display: none;
}

/* ---------- 品牌 ---------- */

.brand {
  position: absolute;
  top: max(22px, env(safe-area-inset-top));
  left: max(24px, env(safe-area-inset-left));
  pointer-events: none;
}

.brand h1 {
  margin: 0;
  font-size: 26px;
  font-weight: 600;
  letter-spacing: 0.14em;
  line-height: 1.1;
}

.brand p {
  margin: 7px 0 0;
  color: var(--muted);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.34em;
}

/* ---------- 工具栏 ---------- */

.toolbar {
  position: absolute;
  top: max(22px, env(safe-area-inset-top));
  right: max(24px, env(safe-area-inset-right));
  display: flex;
  gap: 6px;
  padding: 6px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--glass);
  backdrop-filter: blur(14px);
}

.tool {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  padding: 0;
  border: 1px solid transparent;
  border-radius: 6px;
  background: transparent;
  color: #7f93a6;
  cursor: pointer;
  transition:
    color 140ms ease,
    background-color 140ms ease,
    border-color 140ms ease;
}

.tool svg {
  width: 19px;
  height: 19px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.tool:hover {
  color: #d3e5f4;
  background: rgba(255, 255, 255, 0.06);
}

.tool.is-on {
  border-color: rgba(98, 215, 255, 0.4);
  background: rgba(98, 215, 255, 0.12);
  color: var(--accent);
}

/* ---------- 城市列表 ---------- */

.panel {
  position: absolute;
  top: 78px;
  right: max(24px, env(safe-area-inset-right));
  width: 190px;
  max-height: min(430px, 62vh);
  padding: 14px 6px 12px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--glass);
  backdrop-filter: blur(14px);
  display: flex;
  flex-direction: column;
  transition:
    opacity 180ms ease,
    transform 180ms ease;
}

.panel.is-hidden {
  opacity: 0;
  transform: translateX(12px);
  pointer-events: none;
}

.panel h2 {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.28em;
}

#cityList {
  margin: 0;
  padding: 0 8px 0 0;
  list-style: none;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(150, 200, 240, 0.28) transparent;
}

#cityList::-webkit-scrollbar {
  width: 6px;
}

#cityList::-webkit-scrollbar-thumb {
  border-radius: 3px;
  background: rgba(150, 200, 240, 0.28);
}

#cityList button {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  width: 100%;
  padding: 7px 8px;
  border: 1px solid transparent;
  border-radius: 6px;
  background: transparent;
  color: #b9ccdc;
  font: inherit;
  font-size: 13px;
  text-align: left;
  letter-spacing: 0;
  cursor: pointer;
  transition:
    color 140ms ease,
    background-color 140ms ease,
    border-color 140ms ease;
}

#cityList button span {
  color: #6d8194;
  font-size: 10px;
  font-variant-numeric: tabular-nums;
}

#cityList button:hover {
  background: rgba(255, 255, 255, 0.06);
  color: #fff;
}

#cityList button.is-active {
  border-color: rgba(98, 215, 255, 0.4);
  background: rgba(98, 215, 255, 0.12);
  color: #eafaff;
}

/* ---------- 读数 ---------- */

.readout {
  position: absolute;
  left: max(24px, env(safe-area-inset-left));
  bottom: max(24px, env(safe-area-inset-bottom));
  min-width: 186px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--glass);
  backdrop-filter: blur(14px);
}

.readout__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 18px;
}

.readout__row + .readout__row {
  margin-top: 6px;
}

.readout__row span {
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.16em;
}

.readout__row b {
  color: #dcebf7;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
}

/* ---------- 城市卡片 ---------- */

.citycard {
  position: absolute;
  left: max(24px, env(safe-area-inset-left));
  bottom: calc(max(24px, env(safe-area-inset-bottom)) + 108px);
  width: min(272px, calc(100vw - 48px));
  padding: 16px 18px 14px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: var(--glass-strong);
  backdrop-filter: blur(16px);
  animation: card-in 220ms ease both;
}

.citycard[hidden] {
  display: none;
}

@keyframes card-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.citycard__close {
  position: absolute;
  top: 8px;
  right: 8px;
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  padding: 0;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: #8296a9;
  cursor: pointer;
}

.citycard__close:hover {
  background: rgba(255, 255, 255, 0.07);
  color: #fff;
}

.citycard__close svg {
  width: 15px;
  height: 15px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
}

.citycard__kicker {
  margin: 0 0 6px;
  color: var(--accent);
  font-size: 10px;
  letter-spacing: 0.26em;
}

.citycard h3 {
  margin: 0;
  font-size: 21px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.citycard__en {
  margin: 3px 0 13px;
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.citycard__meta {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 9px 12px;
  margin: 0;
  padding-top: 12px;
  border-top: 1px solid rgba(150, 200, 240, 0.14);
}

.citycard__meta div {
  min-width: 0;
}

.citycard__meta dt {
  color: var(--muted);
  font-size: 10px;
  letter-spacing: 0.16em;
}

.citycard__meta dd {
  margin: 3px 0 0;
  font-family: var(--mono);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
}

/* ---------- 缩放 ---------- */

.zoombar {
  position: absolute;
  right: max(24px, env(safe-area-inset-right));
  bottom: max(24px, env(safe-area-inset-bottom));
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 5px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--glass);
  backdrop-filter: blur(14px);
}

.zoombar button {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  padding: 0;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: #9db2c4;
  cursor: pointer;
  transition:
    color 140ms ease,
    background-color 140ms ease;
}

.zoombar button:hover {
  background: rgba(255, 255, 255, 0.07);
  color: #fff;
}

.zoombar svg {
  width: 17px;
  height: 17px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
}

/* ---------- 载入 ---------- */

.loading {
  position: absolute;
  left: 50%;
  bottom: max(28px, env(safe-area-inset-bottom));
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 9px 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--glass-strong);
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.08em;
  transform: translateX(-50%);
  transition:
    opacity 300ms ease,
    transform 300ms ease;
}

body.is-ready .loading {
  opacity: 0;
  transform: translateX(-50%) translateY(10px);
  pointer-events: none;
}

.loading__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse 1.1s ease-in-out infinite;
}

@keyframes pulse {
  0%,
  100% {
    opacity: 0.25;
    transform: scale(0.8);
  }
  50% {
    opacity: 1;
    transform: scale(1);
  }
}

/* ---------- 响应式 ---------- */

@media (max-width: 860px) {
  .panel {
    top: 74px;
    right: max(14px, env(safe-area-inset-right));
    width: 158px;
    max-height: 42vh;
  }
}

@media (max-width: 640px) {
  .brand {
    top: max(16px, env(safe-area-inset-top));
    left: max(16px, env(safe-area-inset-left));
  }

  .brand h1 {
    font-size: 20px;
    letter-spacing: 0.1em;
  }

  .brand p {
    font-size: 9px;
    letter-spacing: 0.24em;
  }

  .toolbar {
    top: max(16px, env(safe-area-inset-top));
    right: max(16px, env(safe-area-inset-right));
    gap: 3px;
    padding: 4px;
  }

  .tool {
    width: 34px;
    height: 34px;
  }

  .tool svg {
    width: 17px;
    height: 17px;
  }

  .panel {
    /* 窄屏把列表收到工具栏下方，避免与底部城市卡片重叠挡住点击 */
    top: calc(max(16px, env(safe-area-inset-top)) + 52px);
    right: max(16px, env(safe-area-inset-right));
    bottom: auto;
    width: 146px;
    max-height: 30vh;
    padding: 10px 4px 8px 10px;
  }

  .readout {
    left: max(16px, env(safe-area-inset-left));
    bottom: max(16px, env(safe-area-inset-bottom));
    min-width: 0;
    padding: 10px 12px;
  }

  .readout__row {
    gap: 12px;
  }

  .readout__row span {
    font-size: 10px;
    letter-spacing: 0.1em;
  }

  .readout__row b {
    font-size: 11px;
  }

  .zoombar {
    right: max(16px, env(safe-area-inset-right));
    bottom: max(16px, env(safe-area-inset-bottom));
  }

  .zoombar button {
    width: 32px;
    height: 32px;
  }

  .citycard {
    left: 50%;
    bottom: calc(max(16px, env(safe-area-inset-bottom)) + 118px);
    width: min(300px, calc(100vw - 32px));
    transform: translateX(-50%);
  }

  @keyframes card-in {
    from {
      opacity: 0;
      transform: translateX(-50%) translateY(8px);
    }
    to {
      opacity: 1;
      transform: translateX(-50%);
    }
  }

  .loading {
    bottom: auto;
    top: 50%;
  }
}