:root {
  --color-sky-top: #a8d8ea;
  --color-sky-bottom: #fdf6e3;
  --color-cloud: #ffffff;
  --color-text: #3a3a3a;
  --color-text-light: #6b6b6b;
  --color-panel: rgba(255, 253, 245, 0.94);
  --color-panel-border: rgba(255, 255, 255, 0.7);
  --color-shadow: rgba(58, 48, 38, 0.12);
  --color-accent: #e89a56;
  --font-body: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  --radius: 18px;
  --radius-sm: 10px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  font-family: var(--font-body);
  color: var(--color-text);
}

#sky {
  position: fixed;
  inset: 0;
  z-index: 0;
  background: linear-gradient(
    180deg,
    var(--color-sky-top) 0%,
    var(--color-sky-bottom) 75%,
    #f4e4c1 100%
  );
  pointer-events: none;
}

#map-canvas {
  position: fixed;
  inset: 0;
  z-index: 1;
  display: block;
  width: 100%;
  height: 100%;
  outline: none;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10;
  padding: 22px 28px;
  pointer-events: none;
}

.back-link {
  pointer-events: auto;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
  text-decoration: none;
  background: var(--color-panel);
  border: 1px solid var(--color-panel-border);
  border-radius: 999px;
  box-shadow: 0 4px 16px var(--color-shadow);
  backdrop-filter: blur(8px);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.back-link:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px var(--color-shadow);
}

.page-title {
  margin: 14px 0 4px;
  font-size: clamp(26px, 4vw, 40px);
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--color-text);
  text-shadow: 0 2px 12px rgba(255, 255, 255, 0.7);
}

.page-subtitle {
  margin: 0;
  font-size: clamp(13px, 2vw, 16px);
  color: var(--color-text-light);
  text-shadow: 0 1px 8px rgba(255, 255, 255, 0.6);
}

.map-controls {
  position: fixed;
  bottom: 24px;
  left: 24px;
  z-index: 10;
  display: flex;
  gap: 10px;
}

.map-controls button {
  padding: 10px 16px;
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text);
  cursor: pointer;
  background: var(--color-panel);
  border: 1px solid var(--color-panel-border);
  border-radius: 999px;
  box-shadow: 0 4px 16px var(--color-shadow);
  backdrop-filter: blur(8px);
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.map-controls button:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px var(--color-shadow);
}

.tooltip {
  position: fixed;
  z-index: 20;
  padding: 8px 14px;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text);
  pointer-events: none;
  opacity: 0;
  background: var(--color-panel);
  border: 1px solid var(--color-panel-border);
  border-radius: 999px;
  box-shadow: 0 4px 16px var(--color-shadow);
  backdrop-filter: blur(8px);
  transform: translate(-50%, -140%);
  transition: opacity 0.15s ease;
}

.tooltip.visible {
  opacity: 1;
}

.project-panel {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  z-index: 30;
  width: min(420px, 90vw);
  padding: 28px;
  overflow-y: auto;
  background: var(--color-panel);
  border-left: 1px solid var(--color-panel-border);
  box-shadow: -12px 0 40px rgba(58, 48, 38, 0.14);
  backdrop-filter: blur(12px);
  transform: translateX(110%);
  transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}

.project-panel.open {
  transform: translateX(0);
}

.close-panel {
  position: absolute;
  top: 18px;
  right: 18px;
  width: 34px;
  height: 34px;
  font-size: 22px;
  line-height: 1;
  color: var(--color-text);
  cursor: pointer;
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid var(--color-panel-border);
  border-radius: 50%;
  transition: transform 0.2s ease, background 0.2s ease;
}

.close-panel:hover {
  background: #fff;
  transform: rotate(90deg);
}

.panel-media {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  box-shadow: 0 8px 24px var(--color-shadow);
}

.panel-media img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  background: #eee;
}

.panel-content {
  margin-top: 22px;
}

.panel-kicker {
  display: inline-block;
  padding: 4px 10px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: #fff;
  background: var(--color-accent);
  border-radius: 999px;
}

.panel-title {
  margin: 12px 0 6px;
  font-size: 26px;
  font-weight: 700;
  line-height: 1.2;
}

.panel-tagline {
  margin: 0 0 14px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text-light);
}

.panel-summary {
  margin: 0 0 18px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text);
}

.panel-steps {
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
}

.panel-steps li {
  position: relative;
  padding: 8px 0 8px 26px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--color-text-light);
  border-bottom: 1px dashed rgba(0, 0, 0, 0.08);
}

.panel-steps li::before {
  content: "";
  position: absolute;
  top: 13px;
  left: 0;
  width: 14px;
  height: 14px;
  background: var(--color-accent);
  border-radius: 50%;
  opacity: 0.8;
}

.panel-steps li::after {
  content: "";
  position: absolute;
  top: 16px;
  left: 4px;
  width: 6px;
  height: 6px;
  background: #fff;
  border-radius: 50%;
}

.panel-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 12px 20px;
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  text-decoration: none;
  background: var(--color-accent);
  border-radius: 999px;
  box-shadow: 0 4px 16px rgba(232, 154, 86, 0.35);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.panel-link:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 22px rgba(232, 154, 86, 0.45);
}

.loading {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  background: var(--color-sky-bottom);
  transition: opacity 0.4s ease, visibility 0.4s ease;
}

.loading.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.4s ease, visibility 0.4s ease;
}

.loading.force-hidden {
  display: none !important;
}

.loading-text {
  font-size: 16px;
  font-weight: 500;
  color: var(--color-text-light);
}

.loading-bar {
  width: 160px;
  height: 4px;
  overflow: hidden;
  background: rgba(0, 0, 0, 0.08);
  border-radius: 999px;
}

.loading-bar span {
  display: block;
  width: 40%;
  height: 100%;
  background: var(--color-accent);
  border-radius: 999px;
  animation: load 1.2s ease-in-out infinite;
}

@keyframes load {
  0% {
    transform: translateX(-100%);
  }
  100% {
    transform: translateX(260%);
  }
}

@media (max-width: 640px) {
  .site-header {
    padding: 16px 18px;
  }

  .page-title {
    margin-top: 10px;
  }

  .map-controls {
    left: 16px;
    bottom: 16px;
  }

  .project-panel {
    width: 100vw;
    padding: 22px;
    border-radius: var(--radius) var(--radius) 0 0;
    transform: translateY(110%);
  }

  .project-panel.open {
    transform: translateY(0);
  }
}