/* =====================================================================
   层叠的中国 v3 — 滚动叙事样式
   语汇不变：宣纸、墨线、朱砂。交互只剩一个动作：滚动。
   ===================================================================== */

:root {
  --paper:      #f3e9cf;
  --paper-deep: #ece1c4;
  --paper-dim:  #e6dabb;
  --ink:        #1f1a14;
  --ink-85:     rgba(31,26,20,.85);
  --ink-70:     rgba(31,26,20,.70);
  --ink-55:     rgba(31,26,20,.55);
  --ink-40:     rgba(31,26,20,.40);
  --ink-20:     rgba(31,26,20,.20);
  --seal:       #b03a2e;
  --seal-soft:  rgba(176,58,46,.08);
  --thread:     #8a7a5a;
  --serif-cn:   "Noto Serif SC","Songti SC",serif;
  --display-cn: "ZCOOL XiaoWei","Noto Serif SC",serif;
  --latin:      "EB Garamond",Georgia,serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--serif-cn); color: var(--ink);
  background-color: var(--paper);
  background-image:
    radial-gradient(1100px 500px at 8% -4%, rgba(138,122,90,.10), transparent 60%),
    radial-gradient(900px 460px at 104% 0%, rgba(138,122,90,.08), transparent 55%);
  line-height: 1.7;
}
button { font-family: inherit; }
button:focus-visible, summary:focus-visible { outline: 2px solid var(--seal); outline-offset: 2px; }

/* ============ 进度条 ============ */
#progress {
  position: fixed; top: 0; left: 0; height: 3px; width: 0%;
  background: var(--seal); z-index: 90;
}

/* ============ 开场 ============ */
.hero {
  min-height: 100vh; min-height: 100svh;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center; padding: 24px; position: relative;
}
.hero-seal {
  width: 74px; height: 74px; margin-bottom: 30px;
  background: var(--seal); color: var(--paper);
  font-family: var(--display-cn); font-size: 40px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 9px; transform: rotate(-3deg);
  box-shadow: inset 0 0 0 3px rgba(243,233,207,.35), 3px 4px 0 rgba(31,26,20,.18);
}
.hero h1 {
  font-family: var(--display-cn); font-weight: 400;
  font-size: clamp(40px, 7vw, 64px); letter-spacing: .22em; text-indent: .22em;
}
.hero-sub { margin-top: 16px; font-size: clamp(14px, 2.2vw, 17px); color: var(--ink-70); letter-spacing: .28em; }
.hero-how { margin-top: 42px; font-size: 14px; color: var(--ink-55); letter-spacing: .1em; }
.hero-cue {
  margin-top: 10px; font-size: 22px; color: var(--seal);
  animation: cue 1.8s ease-in-out infinite;
}
@keyframes cue { 0%,100% { transform: translateY(0); opacity:.55 } 50% { transform: translateY(8px); opacity:1 } }
#boot-badge {
  position: absolute; bottom: 22px; left: 50%; transform: translateX(-50%);
  font-size: 12px; color: var(--ink-55); letter-spacing: .12em;
  border: 1px dashed var(--thread); padding: 5px 12px; border-radius: 3px;
  background: var(--paper); transition: opacity .8s;
}
#boot-badge.fade { opacity: 0; }

/* ============ 滚动叙事 ============ */
#scrolly { position: relative; }
.map-stick {
  position: sticky; top: 0; height: 100vh; height: 100svh;
  display: flex; align-items: center; justify-content: center;
  overflow: hidden;
}
#story-map { width: 100%; height: 100%; display: block; }

#story-load {
  position: absolute; inset: 0; z-index: 5;
  background: rgba(243,233,207,.94);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 14px; font-size: 14px; color: var(--ink-70); letter-spacing: 2px;
  transition: opacity .4s ease;
}
#story-load.hide { opacity: 0; pointer-events: none; }
.spinner {
  width: 36px; height: 36px; border-radius: 50%;
  border: 3px solid var(--ink-20); border-top-color: var(--seal);
  animation: spin 1s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.load-err { text-align: center; line-height: 2; letter-spacing: .5px; padding: 0 26px; }
.load-err span { font-size: 12px; color: var(--ink-55); }

/* —— 步骤卡 —— */
#steps { position: relative; z-index: 10; pointer-events: none; }
.step {
  min-height: 96vh;
  display: flex; align-items: center;
  padding-left: clamp(16px, 6vw, 90px);
}
.step:first-child { min-height: 60vh; }
.step:last-child { min-height: 110vh; }
.step-card {
  pointer-events: auto;
  max-width: 360px;
  background: rgba(243,233,207,.95);
  border: 1px solid var(--ink-20);
  border-left: 3px solid var(--ink-20);
  box-shadow: 0 6px 26px rgba(31,26,20,.14);
  padding: 20px 22px;
  font-size: 16.5px; line-height: 2.05; color: var(--ink-85);
  letter-spacing: .02em;
  opacity: .45; transform: translateY(6px);
  transition: opacity .35s ease, transform .35s ease, border-color .35s ease;
}
.step.active .step-card {
  opacity: 1; transform: translateY(0);
  border-left-color: var(--seal);
}
.step-card strong { font-weight: 600; color: var(--ink); }
.step-card .k {
  display: inline-block; width: 12px; height: 12px;
  background: var(--c); border: 1px solid var(--ink-20);
  margin: 0 5px 0 2px; vertical-align: -1px;
}
.step-end .step-card { background: rgba(236,225,196,.97); }
.end-title {
  font-family: var(--display-cn); font-size: 24px; letter-spacing: .18em;
}
.btn-seal {
  margin-top: 16px; cursor: pointer;
  background: var(--seal); color: var(--paper);
  border: none; border-radius: 4px;
  padding: 10px 20px; font-size: 14.5px; letter-spacing: .12em;
  box-shadow: 2px 3px 0 rgba(31,26,20,.18);
  transition: transform .15s, box-shadow .15s;
}
.btn-seal:hover { transform: translate(1px,1px); box-shadow: 1px 2px 0 rgba(31,26,20,.18); }

/* ============ 地图图形（两个视图共用） ============ */
.prov-base { fill: var(--paper-deep); stroke: none; }
.pref { stroke: var(--paper); stroke-width: .55px; transition: opacity .2s ease; }
#explore-map .pref:hover { stroke: var(--ink); stroke-width: 1.3px; }
.prov-line {
  fill: none; stroke: #2a2118; stroke-width: 1.05px;
  stroke-linejoin: round; opacity: .88; pointer-events: none;
  transition: stroke-width .3s;
}
.prov-line.strong { stroke-width: 1.55px; }
.prov-line.focus  { stroke: var(--seal); stroke-width: 2.4px; opacity: 1; }
.prov-line.pulse  { animation: borderpulse 1.5s ease-in-out 2; }
@keyframes borderpulse {
  0%,100% { stroke-width: 1.55px; }
  50%     { stroke-width: 3px; }
}

.terr {
  mix-blend-mode: multiply; fill-opacity: .5;
  stroke-width: 1.4px; stroke-opacity: .9;
}
.ghost .terr { fill-opacity: .34; stroke-opacity: .75; }
.terr-label {
  font-family: var(--display-cn); font-size: 16px; fill: var(--ink);
  text-anchor: middle; pointer-events: none;
  paint-order: stroke; stroke: var(--paper); stroke-width: 4px;
}
.range {
  fill: none; stroke: #2a2118; stroke-width: 1.8px;
  stroke-dasharray: 7 4; stroke-linecap: round;
}
.range-label {
  font-family: var(--serif-cn); font-weight: 600; font-size: 12px;
  fill: var(--ink-85);
  paint-order: stroke; stroke: var(--paper); stroke-width: 3.5px;
}
.area-label {
  font-family: var(--display-cn); font-size: 17px;
  fill: rgba(31,26,20,.82); text-anchor: middle; pointer-events: none;
  paint-order: stroke; stroke: rgba(243,233,207,.85); stroke-width: 4px;
  letter-spacing: 2px; transition: opacity .2s;
}
.city-label {
  font-family: var(--display-cn); font-size: 19px;
  fill: var(--ink); text-anchor: middle; pointer-events: none;
  paint-order: stroke; stroke: var(--paper); stroke-width: 4.5px;
  letter-spacing: 1.5px;
}
.pt circle { fill: var(--seal); }
.pt .pt-halo {
  fill: none; stroke: var(--seal); stroke-width: 1.2px; opacity: .55;
  animation: pulse 2.2s ease-out infinite;
}
.pt text {
  font-family: var(--serif-cn); font-weight: 600; font-size: 12.5px;
  fill: var(--seal);
  paint-order: stroke; stroke: var(--paper); stroke-width: 3.5px;
}
@keyframes pulse { 0% { transform: scale(.6); opacity:.7 } 100% { transform: scale(1.8); opacity:0 } }

/* ============ 自由探索 ============ */
#explore { max-width: 1280px; margin: 8vh auto 0; padding: 0 20px; }
.ex-head {
  display: flex; align-items: baseline; gap: 22px; flex-wrap: wrap;
  border-top: 1px solid var(--ink-20); padding-top: 34px; margin-bottom: 16px;
}
.ex-head h2 {
  font-family: var(--display-cn); font-weight: 400;
  font-size: 28px; letter-spacing: .14em;
}
.ex-tabs { display: flex; gap: 0; border: 1px solid var(--thread); border-radius: 4px; overflow: hidden; }
.ex-tab {
  padding: 7px 20px; font-size: 13.5px; letter-spacing: .1em; cursor: pointer;
  background: var(--paper); color: var(--ink-70); border: none;
}
.ex-tab + .ex-tab { border-left: 1px solid var(--thread); }
.ex-tab.on { background: var(--seal); color: var(--paper); }

.ex-wrap {
  display: grid; grid-template-columns: minmax(0,1fr) 320px; gap: 18px;
  align-items: start;
}
.ex-map-frame {
  background: var(--paper);
  border: 1px solid rgba(31,26,20,.4);
  outline: 1px solid var(--ink-20); outline-offset: 4px;
}
#explore-map { display: block; width: 100%; height: auto; }

#ex-side {
  position: sticky; top: 14px;
  background: var(--paper); border: 1px solid var(--ink-20);
  padding: 16px 18px; max-height: calc(100vh - 28px); overflow-y: auto;
  scrollbar-width: thin; scrollbar-color: var(--ink-20) transparent;
}
#ex-legend { display: flex; flex-wrap: wrap; gap: 2px 8px; }
.lg-item {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 12.3px; color: var(--ink-85);
  padding: 2.5px 7px; border-radius: 3px; cursor: default;
  transition: background .15s;
}
.lg-item:hover { background: var(--paper-deep); }
.lg-dot { width: 11px; height: 11px; flex: none; border: 1px solid var(--ink-20); }
.lg-item i { font-family: var(--latin); font-style: italic; font-size: 11px; color: var(--ink-40); }

#ex-detail { margin-top: 14px; padding-top: 12px; border-top: 1px dashed var(--thread); min-height: 92px; }
.p-detail-empty { font-size: 12.5px; color: var(--ink-40); line-height: 1.9; }
.d-name {
  font-family: var(--display-cn); font-size: 19px; letter-spacing: 1px;
  display: flex; align-items: baseline; gap: 9px;
}
.d-name em { font-style: normal; font-size: 12px; color: var(--ink-55); font-family: var(--serif-cn); }
.d-chip { display: inline-flex; align-items: center; gap: 7px; margin-top: 9px; font-size: 13px; font-weight: 600; }
.d-chip::before { content: ""; width: 13px; height: 13px; background: var(--c); border: 1px solid var(--ink-20); }
.d-note  { margin-top: 9px; font-size: 13px; line-height: 1.85; color: var(--ink-85); }
.d-extra { margin-top: 7px; font-size: 12px; color: var(--ink-55); }

/* ============ 提示浮签 ============ */
#tooltip {
  position: fixed; z-index: 60; pointer-events: none;
  background: #2a2118; color: #f0e8d2;
  padding: 7px 11px; border-radius: 4px;
  font-size: 12.5px; line-height: 1.5; max-width: 230px;
  opacity: 0; transition: opacity .15s;
  box-shadow: 0 3px 14px rgba(31,26,20,.35);
}
#tooltip b { display: block; font-family: var(--display-cn); font-weight: 400; font-size: 13.5px; letter-spacing: 1px; }
#tooltip span { opacity: .78; font-size: 11.5px; }

/* ============ 注记与页脚 ============ */
#notes { max-width: 780px; margin: 60px auto 0; padding: 0 22px; }
#notes details {
  border: 1px solid var(--ink-20); background: var(--paper-deep);
  padding: 0;
}
#notes summary {
  cursor: pointer; list-style: none;
  font-family: var(--display-cn); font-size: 17px; letter-spacing: .16em;
  padding: 14px 20px; color: var(--ink-85);
}
#notes summary::-webkit-details-marker { display: none; }
#notes summary::before { content: "» "; color: var(--seal); }
#notes details[open] summary::before { content: "« "; }
.notes-body { padding: 4px 22px 20px; }
.notes-body p { font-size: 13.8px; line-height: 2; color: var(--ink-85); margin: 10px 0; }
.notes-body strong { color: var(--seal); font-weight: 600; }

.site-foot { text-align: center; padding: 44px 20px 40px; font-size: 12px; color: var(--ink-55); letter-spacing: .06em; }

/* ============ 响应式 ============ */
@media (max-width: 900px) {
  .ex-wrap { grid-template-columns: 1fr; }
  #ex-side { position: static; max-height: none; }
}
@media (max-width: 640px) {
  .step { padding: 0 16px; justify-content: center; }
  .step-card { max-width: min(88vw, 380px); font-size: 15px; padding: 16px 18px; }
  .ex-head h2 { font-size: 22px; }
  .area-label { font-size: 20px; }
  .city-label { font-size: 22px; }
}

/* ============ 动效偏好 ============ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}