/* ==========================================================================
   河西走廊千年 · 样式表
   配色：夜蓝 #101a26 / 沙金 #ffcc66 / 纸白 #fdfaf4
   ========================================================================== */

:root {
  --ink: #101a26;
  --ink-2: #1a2a3a;
  --ink-3: #24384c;
  --gold: #ffcc66;
  --gold-deep: #d9a441;
  --paper: #fdfaf4;
  --text: #2a3038;
  --text-soft: #5b6672;

  --nav-h: 54px;
  --card-w: 820px;
  --radius: 14px;
  --shadow: 0 12px 40px rgba(8, 16, 26, 0.34);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB",
               "Noto Sans CJK SC", sans-serif;
  color: var(--text);
  background: var(--ink);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  line-height: 1.75;
}

img { max-width: 100%; display: block; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}

/* ============================================================== 封面 */
.cover-section {
  position: relative;
  z-index: 20;
  width: 100%;
  height: 100vh;
  min-height: 540px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: #fff;
  background: var(--ink) url('../assets/images/cover.jpg') center/cover no-repeat;
  isolation: isolate;
}

/* 上下压暗，中间的标题才立得住 */
.cover-section::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg,
              rgba(6, 12, 20, 0.55) 0%,
              rgba(6, 12, 20, 0.28) 40%,
              rgba(6, 12, 20, 0.72) 100%);
  z-index: -1;
}

.cover-content {
  position: relative;
  max-width: 820px;
  padding: 0 22px;
}

.cover-kicker {
  font-size: clamp(0.75rem, 1.6vw, 0.9rem);
  letter-spacing: 0.42em;
  text-indent: 0.42em;
  color: var(--gold);
  margin-bottom: 1.1rem !important;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.6);
}

.cover-content h1 {
  font-size: clamp(2.2rem, 7vw, 4.4rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.06em;
  margin-bottom: 1.1rem;
  text-shadow: 0 4px 30px rgba(0, 0, 0, 0.7);
}

.cover-content p {
  font-size: clamp(0.95rem, 2.2vw, 1.25rem);
  opacity: 0.94;
  margin-bottom: 1.6rem;
  text-shadow: 0 2px 14px rgba(0, 0, 0, 0.6);
}

.cover-route {
  font-size: clamp(0.72rem, 1.5vw, 0.86rem) !important;
  letter-spacing: 0.06em;
  color: var(--gold);
  opacity: 0.88 !important;
  margin: 0 !important;
  padding-top: 1.2rem;
  border-top: 1px solid rgba(255, 204, 102, 0.3);
  display: inline-block;
}

.scroll-hint {
  position: absolute;
  bottom: 34px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.85rem;
  color: var(--gold);
  letter-spacing: 0.12em;
  animation: bounce 2.2s infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%      { transform: translateX(-50%) translateY(9px); }
}

/* ============================================================== 导航 */
#navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 0 20px;
  background: rgba(12, 20, 30, 0.94);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 204, 102, 0.16);
  z-index: 1000;
  transform: translateY(-100%);
  transition: transform 0.35s ease;
}
#navbar.visible { transform: translateY(0); }

.nav-progress {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}
.progress-track {
  width: 118px;
  height: 4px;
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.16);
  overflow: hidden;
}
.progress-fill {
  display: block;
  height: 100%;
  width: 0;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--gold-deep), var(--gold));
  transition: width 0.5s ease;
}
.progress-text {
  font-size: 0.72rem;
  color: var(--gold);
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

.nav-title {
  font-size: 0.92rem;
  font-weight: 600;
  color: #fff;
  white-space: nowrap;
  letter-spacing: 0.04em;
}

.nav-links {
  display: flex;
  gap: 4px;
  overflow-x: auto;
  margin-left: auto;
  scrollbar-width: none;
}
.nav-links::-webkit-scrollbar { display: none; }

.nav-links a {
  display: block;
  padding: 5px 10px;
  border-radius: 999px;
  font-size: 0.8rem;
  color: #b9c6d2;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s, background 0.2s;
}
.nav-links a:hover { color: #fff; background: rgba(255, 255, 255, 0.08); }
.nav-links a.active {
  color: var(--ink);
  background: var(--gold);
  font-weight: 600;
}

#audio-bar { flex: 0 0 auto; }

#nav-tools {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
}

#content-toggle {
  font-family: inherit;
  font-size: 0.78rem;
  color: #b9c6d2;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 999px;
  padding: 6px 13px;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}
#content-toggle:hover {
  background: rgba(255, 255, 255, 0.14);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.35);
}
/* 已隐藏图文时按钮高亮，提示"再点一下能恢复" */
#content-toggle[aria-pressed="true"] {
  background: var(--gold);
  color: var(--ink);
  border-color: var(--gold);
  font-weight: 600;
}

#audio-toggle {
  font-family: inherit;
  font-size: 0.78rem;
  color: var(--gold);
  background: rgba(255, 204, 102, 0.10);
  border: 1px solid rgba(255, 204, 102, 0.55);
  border-radius: 999px;
  padding: 6px 14px;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
  white-space: nowrap;
}
#audio-toggle:hover { background: var(--gold); color: var(--ink); }

/* ============================================================== 地图 */
#map {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  background: var(--ink-2);
  transition: opacity 0.6s ease;
}

/* 底图压低饱和度和亮度，让金色路线更跳 */
.leaflet-tile-pane { filter: saturate(0.72) brightness(0.82) contrast(1.05); }
.leaflet-control-zoom { margin-top: calc(var(--nav-h) + 14px) !important; }
.leaflet-control-attribution {
  background: rgba(12, 20, 30, 0.7) !important;
  color: #9fb0bf !important;
  font-size: 10px !important;
}
.leaflet-control-attribution a { color: var(--gold) !important; }

/* 底图加载失败时的提示。
   注意：绝不能做成全屏遮罩 —— 地图上还有路线和站点标记，
   一遮就什么都看不见了。所以只做底部一行小字。 */
.map-fallback {
  position: fixed;
  left: 50%;
  bottom: 18px;
  transform: translateX(-50%);
  z-index: 500;
  max-width: min(560px, 92vw);
  padding: 10px 18px;
  border-radius: 10px;
  text-align: center;
  color: #e3b341;
  font-size: 0.82rem;
  line-height: 1.6;
  background: rgba(12, 20, 30, 0.92);
  border: 1px solid rgba(227, 179, 65, 0.4);
  box-shadow: 0 8px 26px rgba(8, 16, 26, 0.45);
  pointer-events: none;
}
.map-fallback p { margin: 0; }
.map-fallback-title { color: #e3b341; font-weight: 600; }
.map-fallback-tip { font-size: 0.78rem !important; color: #9fb0bf !important; margin-top: 4px !important; }

/* 只有 Leaflet 库整个没加载时，才用全屏兜底 */
.map-fallback.is-fatal {
  position: fixed;
  inset: 0;
  left: 0;
  bottom: 0;
  transform: none;
  max-width: none;
  border: 0;
  border-radius: 0;
  padding: 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: linear-gradient(140deg, var(--ink), var(--ink-3));
  color: #9fb0bf;
}
.map-fallback.is-fatal .map-fallback-title { color: #c8d8e0; font-size: 1rem; }

/* ============================================================== 叙事面板 */
#story { position: relative; z-index: 10; }

/* ============================================ 只看地图：把图文收起来 */
/* 卡片会挡住地图。加上 .hide-content 后图文隐藏并让出交互，地图变成全屏；
   叙述逻辑照旧在跑，进度条仍然跟着滚动走。

   这里对"面板"和"卡片"同时下手，并且用 !important：
   卡片上有 animation-fill-mode: both 的入场动画，动画声明的优先级高于普通规则，
   只写普通声明压不住它。 */
body.hide-content .story-panel,
body.hide-content .story-opening,
body.hide-content .story-outro {
  visibility: hidden !important;
  opacity: 0 !important;
  pointer-events: none !important;
}
body.hide-content .story-card {
  visibility: hidden !important;
  opacity: 0 !important;
}
body.hide-content .scroll-hint { visibility: hidden !important; }

.story-panel,
.story-opening,
.story-outro {
  transition: visibility 0.35s ease, opacity 0.35s ease;
}

/* 收起图文时，地图的控制按钮往下挪一点，因为导航栏上多了一个按钮 */
body.hide-content .leaflet-control-zoom {
  margin-top: calc(var(--nav-h) + 14px) !important;
}

.story-panel {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: calc(var(--nav-h) + 40px) 40px 40px;
}
.story-panel:nth-child(odd)  { justify-content: flex-start; }
.story-panel:nth-child(even) { justify-content: flex-end; }

.story-card {
  width: var(--card-w);
  max-width: 100%;
  background: var(--paper);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  border-top: 3px solid var(--gold);
  /* 默认可见。
     重要教训：这里原来写的是 opacity:0，靠 JS 加 .is-active 才显示，
     结果 JS 里那个函数在重构时被弄丢，整页文字全部隐形。
     内容不该依赖 JS 才能被看见 —— 所以默认可见，动画只做增强。 */
  opacity: 1;
}

/* 入场动画：仅在浏览器允许动效时启用。
   JS 给当前站点的面板加 .is-active；加不上也只是没有动画，文字照样看得见。 */
@media (prefers-reduced-motion: no-preference) {
  .story-panel.is-active .story-card {
    animation: card-rise 0.55s cubic-bezier(0.22, 0.8, 0.3, 1) both;
  }
}

@keyframes card-rise {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* 正文加厚之后卡片会变得很高（实测到过 978px，超出 900px 视口，
   底部的"延伸"会被截掉）。所以做成左图右文的横向版式：
   图片窄一点、文字在右侧，高度就压下来了。 */
.card-body {
  display: grid;
  grid-template-columns: 310px 1fr;
  gap: 0;
  align-items: start;
}

.card-main { min-width: 0; }   /* 防止长内容把栅格撑开 */

.card-figure {
  margin: 0;
  background: #e7ecf0;
  position: sticky;
  top: 0;
}
.card-figure img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  display: block;
}
.card-figure img.img-fail {
  aspect-ratio: 3 / 4;
  background:
    repeating-linear-gradient(45deg, #e7ecf0 0 12px, #dbe2e8 12px 24px);
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 18px 24px 0;
}
.card-index {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--ink);
  background: var(--gold);
  border-radius: 999px;
  padding: 3px 10px;
}
.card-era {
  font-size: 0.74rem;
  color: var(--text-soft);
  letter-spacing: 0.04em;
}

.card-name {
  padding: 10px 24px 0;
  font-size: 1.55rem;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: 0.05em;
}
.card-subtitle {
  padding: 2px 24px 0;
  font-size: 0.82rem;
  color: var(--gold-deep);
  letter-spacing: 0.04em;
}

/* 引文：整段用小一号的衬线感排版，左侧一道金线 */
.card-quote {
  margin: 14px 24px 0;
  padding: 10px 0 10px 14px;
  border-left: 3px solid var(--gold);
  font-size: 0.86rem;
  line-height: 1.8;
  color: #6b5a3a;
  background: linear-gradient(90deg, rgba(255, 204, 102, 0.12), transparent 70%);
  border-radius: 0 6px 6px 0;
}


/* 正文：多段落，段间留白 */
.card-text {
  padding: 16px 24px 0;
}
.card-text p {
  font-size: 0.93rem;
  line-height: 1.9;
  color: var(--text);
  margin-bottom: 12px;
  text-indent: 2em;          /* 中文段落首行缩进 */
}
.card-text p:last-child { margin-bottom: 0; }

.card-hint {
  margin: 16px 24px 22px;
  font-size: 0.84rem;
  color: var(--gold-deep);
  letter-spacing: 0.03em;
}

/* 开场卡片上的操作提示 */
.card-tip {
  margin: 0 24px 22px;
  padding-top: 12px;
  border-top: 1px dashed #e0d8c6;
  font-size: 0.79rem;
  line-height: 1.7;
  color: var(--text-soft);
}
.card-tip .key-hint {
  display: inline-block;
  padding: 1px 7px;
  border-radius: 5px;
  background: #f2ecdc;
  border: 1px solid #e0d5bc;
  color: var(--ink);
  font-weight: 600;
  white-space: nowrap;
}

.card-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin: 16px 24px 0;
  padding-top: 12px;
  border-top: 1px solid #e6e0d4;
  font-size: 0.74rem;
  color: var(--text-soft);
  font-variant-numeric: tabular-nums;
}
.card-dist { color: var(--gold-deep); font-weight: 600; }
.card-coord { font-family: Consolas, Menlo, monospace; letter-spacing: 0.02em; }

.card-fact {
  display: flex;
  gap: 10px;
  margin: 12px 24px 22px;
  padding: 11px 14px;
  border-radius: 8px;
  background: #f5f1e6;
  border-left: 3px solid var(--gold);
  font-size: 0.82rem;
  line-height: 1.75;
  color: var(--text-soft);
}
.fact-label {
  flex: 0 0 auto;
  font-weight: 700;
  color: var(--gold-deep);
  letter-spacing: 0.08em;
}
.fact-body { display: block; }

/* ============================================================== 开场卡片 */
.story-opening .story-card {
  border-top-color: var(--ink-3);
}
/* 开场没有配图，不用两列栅格，宽度也收窄一点，读起来更像"序言" */
.story-card-wide { width: 640px; }
.story-card-wide .card-body { grid-template-columns: 1fr; }
.story-opening .card-name {
  font-size: 1.7rem;
  line-height: 1.4;
}
.story-opening .card-text p {
  font-size: 0.95rem;
}

/* ============================================================== 结尾 */
.story-outro {
  min-height: 62vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: calc(var(--nav-h) + 40px) 24px 80px;
}
.outro-inner {
  text-align: center;
  color: #e8eef4;
  background: rgba(12, 20, 30, 0.82);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 204, 102, 0.22);
  border-radius: var(--radius);
  padding: 40px 46px;
  max-width: 520px;
}
.outro-km {
  font-size: clamp(1.4rem, 4vw, 2rem);
  font-weight: 700;
  color: var(--gold);
  letter-spacing: 0.06em;
  margin-bottom: 10px;
}
.outro-line {
  font-size: 0.95rem;
  color: #b9c6d2;
  margin-bottom: 24px;
}
.outro-btn {
  font-family: inherit;
  font-size: 0.88rem;
  color: var(--gold);
  background: transparent;
  border: 1px solid var(--gold);
  border-radius: 999px;
  padding: 10px 26px;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}
.outro-btn:hover { background: var(--gold); color: var(--ink); }

/* ============================================================== 错误提示 */
.load-error {
  margin: 40vh auto 0;
  max-width: 520px;
  text-align: center;
  color: #ffb4a2;
  font-size: 1rem;
  padding: 0 24px;
}
.load-error-tip {
  margin-top: 10px;
  text-align: center;
  color: #9fb0bf;
  font-size: 0.85rem;
  padding: 0 24px;
}

/* ============================================================== 响应式 */

/* 中等屏幕：两列会把文字挤成细条，改回单列 */
@media (max-width: 1024px) {
  .card-body { grid-template-columns: 1fr; }
  .card-figure { position: static; }
  .card-figure img { aspect-ratio: 16 / 9; }
}

@media (max-width: 900px) {
  .nav-title { display: none; }
  .nav-progress { gap: 8px; }
  .progress-track { width: 74px; }
  .progress-text { font-size: 0.68rem; }
}

@media (max-width: 768px) {
  :root { --card-w: 100%; --nav-h: 50px; }
  .story-card-wide { width: 100%; }

  #navbar { gap: 10px; padding: 0 12px; }
  #audio-toggle { padding: 5px 11px; font-size: 0.72rem; }

  /* 小屏：面板居中，卡片托在底部，地图仍在上方可见。
     正文变长后卡片可能超出屏幕，所以限制高度并允许内部滚动。 */
  .story-panel,
  .story-panel:nth-child(odd),
  .story-panel:nth-child(even) {
    align-items: flex-end;
    justify-content: center;
    padding: var(--nav-h) 12px 16px;
  }
  .story-card {
    max-height: 74vh;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }
  /* 小屏改回上图下文 */
  .card-body { grid-template-columns: 1fr; }
  .card-figure { position: static; }
  .card-figure img { aspect-ratio: 16 / 9; }
  .card-name { font-size: 1.3rem; }
  .story-opening .card-name { font-size: 1.4rem; }
  .card-quote { font-size: 0.8rem; }
  .card-text p { font-size: 0.88rem; line-height: 1.85; text-indent: 2em; }
  .card-fact { font-size: 0.78rem; flex-direction: column; gap: 4px; }
  .outro-inner { padding: 30px 22px; }
}

@media (orientation: landscape) and (max-height: 520px) {
  .cover-section { min-height: auto; }
  .cover-content p { margin-bottom: 0.8rem; }
  .scroll-hint { display: none; }
}

/* ============================================================== 404 页面 */
/* 静态站不需要 SPA 回退，找不到的路径应该老实返回 404。
   这个页面由 _redirects 规则触发。 */
.page-404 {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(150deg, var(--ink), var(--ink-3));
  color: #e8eef4;
  padding: 40px 22px;
}
.err-wrap {
  max-width: 560px;
  text-align: center;
}
.err-code {
  font-size: clamp(3.4rem, 15vw, 6rem);
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
  letter-spacing: 0.06em;
  opacity: 0.9;
  margin-bottom: 14px;
}
.page-404 h1 {
  font-size: clamp(1.3rem, 4vw, 1.8rem);
  font-weight: 700;
  letter-spacing: 0.05em;
  margin-bottom: 14px;
}
.err-text {
  font-size: 0.94rem;
  line-height: 1.85;
  color: #9fb0bf;
  margin-bottom: 28px;
}
.err-btn {
  display: inline-block;
  padding: 11px 26px;
  border-radius: 999px;
  border: 1px solid var(--gold);
  color: var(--gold);
  font-size: 0.9rem;
  text-decoration: none;
  transition: background 0.2s, color 0.2s;
}
.err-btn:hover { background: var(--gold); color: var(--ink); }

.err-stations {
  margin-top: 34px;
  padding-top: 22px;
  border-top: 1px solid rgba(255, 204, 102, 0.2);
}
.err-stations-title {
  font-size: 0.8rem;
  color: #7d8d9c;
  margin-bottom: 12px;
}
.err-stations a {
  display: inline-block;
  margin: 0 4px 8px;
  padding: 5px 13px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  color: #c8d5e0;
  font-size: 0.82rem;
  text-decoration: none;
  transition: background 0.2s, color 0.2s;
}
.err-stations a:hover { background: var(--gold); color: var(--ink); }

/* ============================================================== 打印 */
@media print {  #navbar, #map, #map-fallback, .scroll-hint, .outro-btn { display: none !important; }
  body { background: #fff; color: #000; }
  .cover-section { height: auto; padding: 50px 0; color: #000; background: #fff; }
  .cover-section::before { display: none; }
  .cover-content h1, .cover-content p { color: #000; text-shadow: none; }
  .cover-route { color: #666; border-top-color: #ccc; }
  .story-panel { min-height: auto; padding: 22px 0; }
  .story-card { width: 100%; box-shadow: none; border: 1px solid #ccc;
                opacity: 1; transform: none; }
  .card-figure img { max-height: 300px; }
}