/* ============================================
   章节样式
============================================ */

/* ===== Hero ===== */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  position: relative;
  padding: 120px 28px 80px;
  text-align: center;
  overflow: hidden;
}
.hero-mountain-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0.08;
  pointer-events: none;
  display: flex;
  align-items: flex-end;
}
.hero-mountain-bg svg { width: 100%; height: auto; }

.hero-eyebrow {
  font-family: var(--latin-serif);
  font-style: italic;
  font-size: 15px;
  letter-spacing: 0.3em;
  color: var(--ink-faint);
  margin-bottom: 36px;
  z-index: 2;
}

.hero-title {
  font-size: clamp(40px, 7.2vw, 96px);
  letter-spacing: 0.18em;
  font-weight: 500;
  line-height: 1.2;
  color: var(--ink);
  margin: 0 0 28px;
  position: relative;
  z-index: 2;
}
.hero-title .char {
  display: inline-block;
  opacity: 0;
  transform: translateY(40px);
  animation: charRise 1.4s var(--ease-soft) forwards;
}
@keyframes charRise {
  to { opacity: 1; transform: translateY(0); }
}
.hero-title .char-accent {
  color: var(--accent);
}
.hero-subtitle {
  font-size: 17px;
  letter-spacing: 0.5em;
  color: var(--ink-soft);
  margin-bottom: 80px;
  z-index: 2;
  opacity: 0;
  animation: fadeUp 1s var(--ease-soft) 1.6s forwards;
}
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Hero 时间轴 */
.hero-timeline {
  width: min(880px, 92%);
  margin: 0 auto;
  position: relative;
  z-index: 2;
  padding: 40px 0 0;
  opacity: 0;
  animation: fadeUp 1.4s var(--ease-soft) 2.2s forwards;
}
.hero-timeline-track {
  position: relative;
  height: 1px;
  background: var(--line);
  margin: 60px 0 32px;
}
.hero-timeline-fill {
  position: absolute;
  left: 0; top: 0;
  height: 1px;
  background: var(--accent);
  width: 0;
  animation: trackGrow 4s var(--ease-soft) 2.6s forwards;
}
@keyframes trackGrow {
  to { width: 100%; }
}
.hero-timeline-points {
  position: relative;
  display: flex;
  justify-content: space-between;
}
.hero-tp {
  position: relative;
  flex: 1;
  text-align: center;
  opacity: 0;
  transform: translateY(8px);
  animation: fadeUp 0.8s var(--ease-soft) forwards;
}
.hero-tp:nth-child(1) { animation-delay: 2.8s; }
.hero-tp:nth-child(2) { animation-delay: 3.6s; }
.hero-tp:nth-child(3) { animation-delay: 4.4s; }
.hero-tp:nth-child(4) { animation-delay: 5.2s; }
.hero-tp::before {
  content: "";
  position: absolute;
  top: -36px;
  left: 50%;
  transform: translateX(-50%);
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--paper);
  border: 1.5px solid var(--accent);
}
.hero-tp.active::before {
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-bg);
}
.hero-tp .year {
  font-family: var(--latin-serif);
  font-size: 22px;
  font-weight: 500;
  color: var(--ink);
  margin-bottom: 8px;
  letter-spacing: 0.05em;
}
.hero-tp .desc {
  font-size: 13px;
  color: var(--ink-faint);
  letter-spacing: 0.1em;
  line-height: 1.6;
  max-width: 140px;
  margin: 0 auto;
}

.hero-scroll {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--latin-serif);
  font-style: italic;
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--ink-faint);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  opacity: 0;
  animation: fadeUp 1s var(--ease-soft) 5.8s forwards;
}
.hero-scroll::after {
  content: "";
  width: 1px;
  height: 32px;
  background: var(--ink-faint);
  animation: scrollLine 2s ease-in-out infinite;
}
@keyframes scrollLine {
  0%, 100% { transform: scaleY(0.4); transform-origin: top; }
  50% { transform: scaleY(1); transform-origin: top; }
}

/* ===== 章节通用 ===== */
.section-head {
  margin-bottom: 80px;
}

/* 三阶段 */
.stages {
  display: grid;
  gap: 48px;
  margin: 64px 0;
}
.stage-card {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 32px;
  align-items: start;
  padding: 32px 0;
  border-top: 1px solid var(--line);
  transition: background 0.4s;
}
.stage-card:last-child { border-bottom: 1px solid var(--line); }
.stage-card .stage-num {
  font-family: var(--latin-serif);
  font-style: italic;
  font-size: 48px;
  font-weight: 400;
  color: var(--accent);
  line-height: 1;
  letter-spacing: 0;
}
.stage-card h4 {
  font-size: 22px;
  margin-bottom: 12px;
  letter-spacing: 0.06em;
  font-weight: 500;
}
.stage-card p {
  color: var(--ink-soft);
  font-size: 15.5px;
  line-height: 1.95;
}

/* 政策卡片 */
.policy-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1px;
  background: var(--line);
  margin: 64px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.policy-cell {
  background: var(--paper);
  padding: 32px 28px;
  transition: background 0.4s;
}
.policy-cell:hover { background: var(--paper-soft); }
.policy-cell .pc-year {
  font-family: var(--latin-serif);
  font-style: italic;
  font-size: 15px;
  color: var(--accent);
  letter-spacing: 0.1em;
  margin-bottom: 10px;
}
.policy-cell .pc-title {
  font-size: 16px;
  font-weight: 500;
  letter-spacing: 0.04em;
  margin-bottom: 10px;
  line-height: 1.6;
  color: var(--ink);
}
.policy-cell .pc-desc {
  font-size: 13.5px;
  color: var(--ink-faint);
  line-height: 1.7;
}
.policy-cell a.pc-title:hover { color: var(--accent); }

/* 科技赋能 */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 56px 40px;
  margin: 64px 0;
}
.tech-item .tech-icon {
  width: 56px;
  height: 56px;
  margin-bottom: 24px;
  color: var(--accent);
}
.tech-item h4 {
  font-size: 19px;
  margin-bottom: 12px;
  letter-spacing: 0.06em;
}
.tech-item p {
  font-size: 14.5px;
  color: var(--ink-soft);
  line-height: 1.85;
}

/* 案例 */
.cases {
  display: grid;
  gap: 120px;
  margin: 80px 0;
}
.case {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: center;
}
@media (min-width: 900px) {
  .case { grid-template-columns: 1.1fr 0.9fr; gap: 64px; }
  .case.reverse { grid-template-columns: 0.9fr 1.1fr; }
  .case.reverse .case-image { order: 2; }
}
.case-image {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--paper-soft);
}
.case-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.85) contrast(0.95);
  transition: transform 1.4s var(--ease-soft), filter 0.6s;
}
.case-image:hover img {
  transform: scale(1.04);
  filter: saturate(1) contrast(1);
}
.case-image::after {
  content: "";
  position: absolute;
  inset: 12px;
  border: 1px solid rgba(255,255,255,0.4);
  pointer-events: none;
}
.case-meta { padding: 8px 0; }
.case-meta .case-loc {
  font-family: var(--latin-serif);
  font-style: italic;
  font-size: 14px;
  color: var(--accent);
  letter-spacing: 0.2em;
  margin-bottom: 16px;
  display: block;
}
.case-meta h3 {
  font-size: 28px;
  letter-spacing: 0.06em;
  margin-bottom: 24px;
  line-height: 1.4;
  font-weight: 500;
}
.case-meta p {
  font-size: 16px;
  color: var(--ink-soft);
  line-height: 2.0;
  margin-bottom: 24px;
}
.case-stats {
  display: flex;
  gap: 32px;
  margin-top: 32px;
  flex-wrap: wrap;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}
.case-stat .num {
  font-family: var(--latin-serif);
  font-size: 28px;
  color: var(--accent);
  font-weight: 500;
  display: block;
  letter-spacing: 0.02em;
}
.case-stat .lbl {
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--ink-faint);
  margin-top: 4px;
}
.case-source {
  font-size: 13px;
  color: var(--ink-faint);
  margin-top: 20px;
  letter-spacing: 0.05em;
}
.case-source a { color: var(--ink-faint); border-bottom: 1px solid var(--line); padding-bottom: 1px; transition: color 0.3s; }
.case-source a:hover { color: var(--accent); border-color: currentColor; }

/* 口述故事 */
.voices {
  margin: 80px 0;
}
.voices-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
  margin-top: 48px;
}
.voice {
  padding: 36px 32px;
  background: var(--paper-soft);
  border-radius: 2px;
  position: relative;
  transition: transform 0.5s var(--ease-soft), background 0.4s;
}
.voice:hover { transform: translateY(-4px); background: var(--paper-deep); }
.voice .voice-quote-mark {
  font-family: var(--latin-serif);
  font-size: 64px;
  color: var(--accent);
  opacity: 0.3;
  line-height: 0.5;
  margin-bottom: 12px;
  font-style: italic;
}
.voice p {
  font-size: 15.5px;
  line-height: 2.0;
  color: var(--ink);
  margin-bottom: 24px;
  font-style: italic;
}
.voice .voice-by {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}
.voice .voice-by .avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--accent-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-size: 14px;
  letter-spacing: 0.1em;
  font-family: var(--serif);
}
.voice .voice-by .who {
  font-size: 13px;
  color: var(--ink-soft);
  letter-spacing: 0.1em;
}
.voice .voice-by .role {
  font-size: 11px;
  color: var(--ink-faint);
  letter-spacing: 0.2em;
  display: block;
  margin-top: 2px;
}

/* 数据 / 图表 */
.data-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1px;
  background: var(--line);
  margin: 64px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.data-cell {
  padding: 36px 24px;
  background: var(--paper);
  text-align: center;
}
.data-cell .num {
  font-family: var(--latin-serif);
  font-size: 44px;
  color: var(--accent);
  letter-spacing: 0.02em;
  font-weight: 500;
  line-height: 1.1;
  display: block;
}
.data-cell .num .unit { font-size: 18px; color: var(--ink-soft); margin-left: 4px; }
.data-cell .lbl {
  font-size: 12.5px;
  letter-spacing: 0.2em;
  color: var(--ink-faint);
  margin-top: 12px;
}
.data-cell .desc {
  font-size: 13px;
  color: var(--ink-soft);
  margin-top: 6px;
  line-height: 1.6;
}

#barChart, #pieChart {
  width: 100%;
  height: 360px;
  margin: 24px 0 56px;
}
.charts-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 56px;
  margin: 64px 0;
}
@media (min-width: 900px) {
  .charts-row { grid-template-columns: 1fr 1fr; gap: 32px; }
}
.chart-block h4 {
  font-size: 16px;
  letter-spacing: 0.2em;
  color: var(--ink-soft);
  margin-bottom: 20px;
  font-weight: 500;
  text-align: center;
}

/* 政策表格 */
.region-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  margin: 48px 0;
}
.region-table th {
  font-weight: 500;
  letter-spacing: 0.15em;
  font-size: 12.5px;
  color: var(--ink-faint);
  padding: 16px 12px;
  text-align: left;
  border-bottom: 1px solid var(--ink);
  background: transparent;
}
.region-table td {
  padding: 18px 12px;
  border-bottom: 1px solid var(--line-soft);
  color: var(--ink-soft);
  letter-spacing: 0.02em;
}
.region-table tr:hover td { background: var(--paper-soft); }
.region-table .place { color: var(--ink); font-weight: 500; }

/* 碳足迹计算器 */
.carbon {
  margin: 64px 0;
  padding: 48px;
  background: var(--paper-soft);
  border-radius: 2px;
  border-top: 2px solid var(--accent);
}
.carbon-head {
  display: flex;
  gap: 28px;
  align-items: baseline;
  flex-wrap: wrap;
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--line);
}
.carbon-head h3 {
  font-size: 22px;
  letter-spacing: 0.08em;
  font-weight: 500;
}
.carbon-head .sub {
  font-size: 13px;
  color: var(--ink-faint);
  letter-spacing: 0.15em;
}
.carbon-fields {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px 36px;
  margin-bottom: 32px;
}
.carbon-field label {
  display: block;
  font-size: 12.5px;
  letter-spacing: 0.2em;
  color: var(--ink-faint);
  margin-bottom: 8px;
}
.carbon-field input,
.carbon-field select {
  width: 100%;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--line);
  padding: 8px 0;
  font-family: var(--serif);
  font-size: 17px;
  color: var(--ink);
  letter-spacing: 0.05em;
  transition: border-color 0.3s;
  outline: none;
}
.carbon-field input:focus,
.carbon-field select:focus {
  border-bottom-color: var(--accent);
}
.carbon-actions {
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}
.carbon-btn {
  padding: 12px 36px;
  background: var(--ink);
  color: var(--paper);
  border: none;
  font-family: var(--serif);
  font-size: 14px;
  letter-spacing: 0.3em;
  border-radius: 1px;
  transition: background 0.3s;
}
.carbon-btn:hover { background: var(--accent); }
.carbon-result {
  flex: 1;
  font-family: var(--serif);
  font-size: 16px;
  color: var(--ink-soft);
  letter-spacing: 0.04em;
}
.carbon-result .big {
  font-family: var(--latin-serif);
  font-size: 34px;
  color: var(--accent);
  margin-right: 8px;
  letter-spacing: 0;
}

/* 行动清单 */
.actions {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1px;
  background: var(--line);
  margin: 64px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.action {
  padding: 32px 28px;
  background: var(--paper);
  cursor: pointer;
  transition: background 0.4s;
  display: flex;
  gap: 18px;
  align-items: flex-start;
}
.action:hover { background: var(--paper-soft); }
.action .num {
  font-family: var(--latin-serif);
  font-style: italic;
  font-size: 18px;
  color: var(--accent);
  letter-spacing: 0;
  flex-shrink: 0;
  padding-top: 2px;
  width: 28px;
}
.action h5 {
  font-size: 15.5px;
  font-weight: 500;
  letter-spacing: 0.05em;
  margin-bottom: 6px;
}
.action p {
  font-size: 13.5px;
  color: var(--ink-faint);
  line-height: 1.75;
}

/* 时代意义 */
.value-list {
  display: grid;
  gap: 32px;
  margin: 64px 0;
}
.value-row {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 24px;
  padding: 28px 0;
  border-bottom: 1px solid var(--line-soft);
  align-items: baseline;
}
.value-row .v-num {
  font-family: var(--latin-serif);
  font-style: italic;
  font-size: 16px;
  color: var(--accent);
  letter-spacing: 0.1em;
}
.value-row .v-content h5 {
  font-size: 18px;
  margin-bottom: 8px;
  letter-spacing: 0.05em;
  font-weight: 500;
}
.value-row .v-content p {
  font-size: 15px;
  color: var(--ink-soft);
  line-height: 1.9;
}

/* 角色路径 */
.path-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 32px;
  margin: 64px 0;
}
.path {
  padding: 36px 28px;
  text-align: center;
  border: 1px solid var(--line);
  transition: all 0.4s var(--ease-soft);
}
.path:hover {
  border-color: var(--accent);
  background: var(--paper-soft);
  transform: translateY(-4px);
}
.path .icon {
  width: 40px;
  height: 40px;
  margin: 0 auto 18px;
  color: var(--accent);
}
.path h5 {
  font-size: 18px;
  letter-spacing: 0.15em;
  margin-bottom: 12px;
  font-weight: 500;
}
.path p {
  font-size: 13.5px;
  color: var(--ink-soft);
  line-height: 1.85;
}

/* 中国地图 */
.map-section .map-wrap {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin: 48px 0;
}
@media (min-width: 980px) {
  .map-section .map-wrap { grid-template-columns: 1.4fr 1fr; gap: 48px; }
}
.region-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}
.legend-item {
  cursor: pointer;
  padding: 6px 14px;
  font-size: 12.5px;
  letter-spacing: 0.15em;
  color: var(--ink-soft);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 1px;
  font-family: var(--serif);
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all 0.3s;
}
.legend-item i {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: block;
}
.legend-item:hover { border-color: var(--accent); color: var(--accent); }
.legend-item.active { background: var(--accent); color: var(--paper); border-color: var(--accent); }
.legend-item.active i { background: var(--paper) !important; }

#chinaMap {
  width: 100%;
  height: 520px;
}

.region-detail {
  background: var(--paper-soft);
  padding: 32px;
  border-top: 2px solid var(--accent);
  min-height: 400px;
}
.region-detail .rd-region {
  font-family: var(--latin-serif);
  font-style: italic;
  font-size: 14px;
  letter-spacing: 0.25em;
  color: var(--accent);
  margin-bottom: 16px;
}
.region-detail h4 {
  font-size: 22px;
  margin-bottom: 10px;
  letter-spacing: 0.05em;
  font-weight: 500;
  color: var(--ink);
}
.region-detail .rd-sub {
  font-size: 13px;
  color: var(--ink-faint);
  letter-spacing: 0.2em;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}
.region-detail h5 {
  font-size: 14px;
  letter-spacing: 0.2em;
  color: var(--accent);
  margin: 24px 0 10px;
  font-weight: 500;
}
.region-detail p {
  font-size: 14px;
  line-height: 1.95;
  color: var(--ink-soft);
}

/* Footer */
.site-foot {
  padding: 96px 28px 64px;
  text-align: center;
  border-top: 1px solid var(--line);
  margin-top: 120px;
}
.site-foot .foot-mark {
  font-family: var(--serif);
  font-size: 13px;
  letter-spacing: 0.5em;
  color: var(--ink-soft);
  margin-bottom: 12px;
}
.site-foot .foot-meta {
  font-family: var(--latin-serif);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--ink-faint);
}

/* 响应式 */
@media (max-width: 720px) {
  .hero-title { letter-spacing: 0.1em; }
  .hero-subtitle { letter-spacing: 0.3em; font-size: 14px; }
  .hero-tp .desc { font-size: 11px; }
  .hero-tp .year { font-size: 16px; }
  .stage-card { grid-template-columns: 1fr; gap: 12px; }
  .case-stats { gap: 20px; }
  .carbon { padding: 28px 20px; }
}