:root {
  color-scheme: light;
  --ink: #261f1b;
  --muted: #6f6257;
  --paper: #f6f1e8;
  --panel: #fffaf1;
  --line: #d8c9b3;
  --accent: #8a2f2a;
  --accent-strong: #5f1c18;
  --gold: #b88a32;
  --green: #2f5d50;
  --shadow: 0 18px 48px rgba(55, 36, 21, 0.16);
}

html[data-theme="dark"] {
  color-scheme: dark;
  --ink: #f4eadb;
  --muted: #c2b2a0;
  --paper: #14100d;
  --panel: #201915;
  --line: #4a3b31;
  --accent: #d77a65;
  --accent-strong: #ffb29b;
  --gold: #e3b35d;
  --green: #98c9b8;
  --shadow: 0 18px 48px rgba(0, 0, 0, 0.34);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Noto Serif SC", "Songti SC", Georgia, "Times New Roman", serif;
  line-height: 1.65;
  transition: background 180ms ease, color 180ms ease;
}

a {
  color: inherit;
}

.hero {
  min-height: 72vh;
  display: flex;
  flex-direction: column;
  color: #fff8ea;
  background:
    radial-gradient(120% 90% at 18% 8%, rgba(184, 138, 50, 0.22), rgba(184, 138, 50, 0) 60%),
    radial-gradient(90% 80% at 92% 100%, rgba(47, 93, 80, 0.30), rgba(47, 93, 80, 0) 55%),
    linear-gradient(135deg, #20120e 0%, #3a201a 38%, #5f1c18 72%, #2b2118 100%);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 22px clamp(18px, 5vw, 68px);
  border-bottom: 1px solid rgba(255, 248, 234, 0.22);
}

.brand {
  font-weight: 800;
  text-decoration: none;
  letter-spacing: 0.04em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
  font-size: 0.95rem;
}

.nav-links a {
  text-decoration: none;
  color: rgba(255, 248, 234, 0.86);
}

.theme-toggle {
  min-width: 54px;
  min-height: 32px;
  border: 1px solid rgba(255, 248, 234, 0.36);
  border-radius: 999px;
  padding: 6px 12px;
  background: rgba(255, 248, 234, 0.1);
  color: rgba(255, 248, 234, 0.92);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.theme-toggle:hover,
.theme-toggle:focus-visible {
  border-color: rgba(255, 248, 234, 0.7);
  background: rgba(255, 248, 234, 0.18);
  outline: none;
}

.hero-content {
  width: min(880px, calc(100% - 36px));
  margin: auto 0 8vh;
  padding-left: clamp(18px, 5vw, 68px);
}

.eyebrow,
.section-kicker {
  margin: 0 0 8px;
  color: var(--gold);
  font-family: Arial, "Microsoft YaHei", sans-serif;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  font-size: clamp(3rem, 8vw, 6.8rem);
  line-height: 1;
  letter-spacing: 0;
}

.hero-copy {
  max-width: 660px;
  margin: 24px 0 0;
  color: rgba(255, 248, 234, 0.9);
  font-size: 1.16rem;
}

main {
  width: min(1220px, calc(100% - 28px));
  margin: 0 auto;
}

.controls-section,
.periods-section,
.explorer,
.detail-section,
.sources-section {
  margin: 34px 0;
}

.controls-section {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  padding: 24px 0 8px;
}

h2,
h3,
p {
  overflow-wrap: anywhere;
}

h2 {
  margin: 0;
  font-size: clamp(1.55rem, 3vw, 2.35rem);
  line-height: 1.2;
}

.section-heading {
  margin-bottom: 16px;
}

.filters {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-family: Arial, "Microsoft YaHei", sans-serif;
  font-size: 0.85rem;
}

select,
.search-input {
  min-width: 150px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 10px 34px 10px 12px;
  background: var(--panel);
  color: var(--ink);
  font: inherit;
}

.search-input {
  min-width: min(260px, 100%);
  padding-right: 12px;
}

.explorer {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(320px, 0.8fr);
  gap: 20px;
  align-items: stretch;
}

.periods-section {
  scroll-margin-top: 20px;
}

.period-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.period-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 16px;
}

.period-nav a {
  border: 1px solid rgba(184, 138, 50, 0.45);
  border-radius: 999px;
  padding: 6px 10px;
  background: #fff8ea;
  color: var(--accent-strong);
  font-family: Arial, "Microsoft YaHei", sans-serif;
  font-size: 0.84rem;
  font-weight: 700;
  text-decoration: none;
}

.period-nav a:hover,
.period-nav a:focus-visible {
  border-color: var(--accent);
  outline: none;
}

.period-card {
  display: grid;
  grid-template-rows: auto 1fr;
  gap: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
  background: var(--panel);
  box-shadow: var(--shadow);
  scroll-margin-top: 16px;
}

.period-card-head h3 {
  margin: 0 0 8px;
  color: var(--accent-strong);
}

.period-card-head p {
  margin: 0;
  color: var(--muted);
  font-size: 0.96rem;
}

.period-items {
  display: grid;
  gap: 8px;
  max-height: 320px;
  overflow-y: auto;
  padding-right: 6px;
  scrollbar-width: thin;
  scrollbar-color: rgba(184, 138, 50, 0.4) transparent;
  scroll-padding: 4px;
}

.period-items::-webkit-scrollbar {
  width: 6px;
}

.period-items::-webkit-scrollbar-track {
  background: transparent;
}

.period-items::-webkit-scrollbar-thumb {
  background: rgba(184, 138, 50, 0.4);
  border-radius: 999px;
}

.period-items::-webkit-scrollbar-thumb:hover {
  background: rgba(184, 138, 50, 0.65);
}

html[data-theme="dark"] .period-items {
  scrollbar-color: rgba(227, 179, 93, 0.35) transparent;
}

html[data-theme="dark"] .period-items::-webkit-scrollbar-thumb {
  background: rgba(227, 179, 93, 0.35);
}

html[data-theme="dark"] .period-items::-webkit-scrollbar-thumb:hover {
  background: rgba(227, 179, 93, 0.55);
}

.period-item {
  display: grid;
  gap: 3px;
  width: 100%;
  border: 1px solid rgba(216, 201, 179, 0.9);
  border-radius: 6px;
  padding: 10px 11px;
  background: #fbf5ea;
  color: var(--ink);
  cursor: pointer;
  text-align: left;
}

.period-item:hover,
.period-item:focus-visible {
  border-color: var(--gold);
  outline: none;
}

.period-item.is-active {
  border-color: var(--accent);
  background: #fff1df;
  box-shadow: inset 3px 0 0 var(--accent);
}

.period-item span,
.period-item small {
  color: var(--muted);
  font-family: Arial, "Microsoft YaHei", sans-serif;
  font-size: 0.82rem;
}

.map-panel,
.timeline-panel,
.detail-main,
.sources-section {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.map-panel,
.timeline-panel,
.detail-main {
  padding: 18px;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 14px;
}

.panel-header.compact {
  margin-bottom: 4px;
}

.result-count {
  margin: 0;
  color: var(--green);
  font-family: Arial, "Microsoft YaHei", sans-serif;
  font-weight: 700;
}

#map {
  width: 100%;
  min-height: 560px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #d9e0d6;
  overflow: hidden;
}

.map-warning {
  margin: 10px 0 0;
  color: var(--accent-strong);
  font-family: Arial, "Microsoft YaHei", sans-serif;
  font-size: 0.92rem;
}

.timeline-panel {
  max-height: 682px;
  overflow: auto;
  scrollbar-gutter: stable;
}

.timeline-list {
  display: grid;
  gap: 10px;
  padding: 8px 2px 2px;
}

.timeline-selection {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin: 8px 0 10px;
  border: 1px solid rgba(95, 124, 116, 0.35);
  border-radius: 6px;
  padding: 9px 10px;
  background: #f4f8f4;
  color: var(--muted);
  font-family: Arial, "Microsoft YaHei", sans-serif;
  font-size: 0.88rem;
}

.timeline-selection[hidden] {
  display: none;
}

.timeline-selection button,
.popup-detail-link {
  border: 1px solid rgba(95, 124, 116, 0.45);
  border-radius: 999px;
  padding: 6px 10px;
  background: #ffffff;
  color: var(--accent-strong);
  font-family: Arial, "Microsoft YaHei", sans-serif;
  font-size: 0.84rem;
  font-weight: 700;
  cursor: pointer;
}

.timeline-selection button:hover,
.timeline-selection button:focus-visible,
.popup-detail-link:hover,
.popup-detail-link:focus-visible {
  border-color: var(--accent);
  outline: none;
}

.timeline-item {
  width: 100%;
  display: grid;
  grid-template-columns: 70px 1fr;
  gap: 12px;
  align-items: start;
  border: 1px solid transparent;
  border-left: 4px solid var(--line);
  border-radius: 6px;
  padding: 12px 10px;
  background: #fbf5ea;
  color: var(--ink);
  cursor: pointer;
  text-align: left;
  transition: border-color 160ms ease, transform 160ms ease, background 160ms ease;
}

.timeline-item:hover,
.timeline-item:focus-visible {
  border-color: var(--gold);
  transform: translateY(-1px);
  outline: none;
}

.timeline-item.is-active {
  border-color: var(--accent);
  border-left-color: var(--accent);
  background: #fff1df;
}

.timeline-year {
  display: grid;
  gap: 2px;
  color: var(--accent);
  font-family: Arial, "Microsoft YaHei", sans-serif;
  font-weight: 800;
}

.timeline-year small {
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 700;
}

.timeline-body {
  display: grid;
  gap: 2px;
}

.timeline-body span {
  color: var(--muted);
  font-size: 0.95rem;
}

.detail-section {
  scroll-margin-top: 20px;
}

.detail-main {
  padding: clamp(22px, 4vw, 36px);
}

.detail-meta {
  margin: 10px 0 14px;
  color: var(--muted);
  font-family: Arial, "Microsoft YaHei", sans-serif;
}

.detail-period {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 22px;
}

.detail-period span,
.detail-period a {
  border: 1px solid rgba(184, 138, 50, 0.45);
  border-radius: 999px;
  padding: 5px 10px;
  background: #fff8ea;
  color: var(--accent-strong);
  font-family: Arial, "Microsoft YaHei", sans-serif;
  font-size: 0.82rem;
  font-weight: 700;
  text-decoration: none;
}

.detail-period a:hover,
.detail-period a:focus-visible {
  border-color: var(--accent);
  outline: none;
}

.detail-reading {
  display: grid;
  gap: 10px;
  margin: 0 0 22px;
  border: 1px solid rgba(95, 124, 116, 0.35);
  border-radius: 6px;
  padding: 12px 14px;
  background: #f4f8f4;
}

.detail-reading[hidden] {
  display: none;
}

.detail-reading span {
  color: var(--muted);
  font-family: Arial, "Microsoft YaHei", sans-serif;
  font-size: 0.9rem;
}

.reading-target {
  color: var(--accent-strong);
  font-family: Arial, "Microsoft YaHei", sans-serif;
  font-size: 0.92rem;
}

.detail-reading div {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.detail-reading a {
  border: 1px solid rgba(95, 124, 116, 0.45);
  border-radius: 999px;
  padding: 6px 11px;
  background: #ffffff;
  color: var(--accent-strong);
  font-family: Arial, "Microsoft YaHei", sans-serif;
  font-size: 0.86rem;
  font-weight: 700;
  text-decoration: none;
}

.detail-reading a:hover,
.detail-reading a:focus-visible {
  border-color: var(--accent);
  outline: none;
}

.place-note {
  display: grid;
  gap: 7px;
  margin: 0 0 24px;
  border: 1px solid rgba(184, 138, 50, 0.45);
  border-left: 4px solid var(--gold);
  border-radius: 6px;
  padding: 14px 16px;
  background: #fff4df;
}

.place-note span {
  color: var(--muted);
  font-family: Arial, "Microsoft YaHei", sans-serif;
  font-size: 0.9rem;
}

.place-note strong {
  color: var(--accent-strong);
  font-size: 1.1rem;
}

.place-note p {
  margin: 0;
}

.place-note a {
  color: var(--accent-strong);
  font-family: Arial, "Microsoft YaHei", sans-serif;
  font-weight: 700;
}

.place-image {
  display: grid;
  gap: 7px;
  margin: 8px 0 0;
}

.place-image[hidden] {
  display: none;
}

.place-image img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  border-radius: 6px;
  object-fit: cover;
  background: #efe5d2;
}

.place-image figcaption {
  display: grid;
  gap: 3px;
  color: var(--muted);
  font-family: Arial, "Microsoft YaHei", sans-serif;
  font-size: 0.78rem;
  line-height: 1.45;
}

.place-image figcaption a {
  font-size: 0.78rem;
}

.detail-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.detail-grid article {
  border-top: 2px solid var(--gold);
  padding-top: 12px;
}

.detail-grid h3 {
  margin: 0 0 8px;
  color: var(--accent-strong);
}

.detail-grid p {
  margin: 0;
}

.detail-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin-top: 24px;
}

.detail-map-link,
.source-link {
  display: inline-flex;
  align-items: center;
  border: 0;
  background: transparent;
  color: var(--accent-strong);
  font-family: Arial, "Microsoft YaHei", sans-serif;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
}

.detail-map-link {
  border: 1px solid rgba(95, 124, 116, 0.45);
  border-radius: 999px;
  padding: 7px 12px;
  background: #f4f8f4;
}

.detail-map-link[hidden],
.source-link[hidden] {
  display: none;
}

.detail-map-link:hover,
.detail-map-link:focus-visible,
.source-link:hover,
.source-link:focus-visible {
  color: var(--accent);
  outline: none;
}

.sources-section {
  padding: clamp(22px, 4vw, 34px);
}

.sources-section p {
  max-width: 880px;
  color: var(--muted);
}

.source-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 18px;
  margin-top: 18px;
  font-family: Arial, "Microsoft YaHei", sans-serif;
  font-size: 0.93rem;
}

.source-list a {
  color: var(--accent-strong);
}

footer {
  padding: 28px 18px 42px;
  color: var(--muted);
  text-align: center;
  font-family: Arial, "Microsoft YaHei", sans-serif;
}

code {
  background: rgba(138, 47, 42, 0.08);
  border: 1px solid rgba(138, 47, 42, 0.15);
  border-radius: 4px;
  padding: 2px 5px;
}

html[data-theme="dark"] .hero {
  background:
    radial-gradient(120% 90% at 18% 8%, rgba(227, 179, 93, 0.16), rgba(227, 179, 93, 0) 60%),
    radial-gradient(90% 80% at 92% 100%, rgba(47, 93, 80, 0.26), rgba(47, 93, 80, 0) 55%),
    linear-gradient(135deg, #0c0807 0%, #1a0f0c 42%, #2e120f 74%, #14100d 100%);
}

html[data-theme="dark"] select,
html[data-theme="dark"] .search-input,
html[data-theme="dark"] .period-card,
html[data-theme="dark"] .map-panel,
html[data-theme="dark"] .timeline-panel,
html[data-theme="dark"] .detail-main,
html[data-theme="dark"] .sources-section {
  background: var(--panel);
}

html[data-theme="dark"] .period-item,
html[data-theme="dark"] .timeline-item {
  border-color: rgba(74, 59, 49, 0.9);
  background: #281f1a;
}

html[data-theme="dark"] .period-item.is-active,
html[data-theme="dark"] .timeline-item.is-active {
  background: #342119;
}

html[data-theme="dark"] .timeline-selection,
html[data-theme="dark"] .detail-reading,
html[data-theme="dark"] .detail-map-link {
  background: #1c2823;
}

html[data-theme="dark"] .timeline-selection button,
html[data-theme="dark"] .popup-detail-link,
html[data-theme="dark"] .detail-reading a {
  background: #251d18;
  color: var(--accent-strong);
}

html[data-theme="dark"] .period-nav a,
html[data-theme="dark"] .detail-period span,
html[data-theme="dark"] .detail-period a {
  background: #2b221a;
}

html[data-theme="dark"] .place-note {
  background: #2b2118;
}

html[data-theme="dark"] .place-image img {
  background: #30261f;
}

html[data-theme="dark"] #map {
  background: #202720;
}

html[data-theme="dark"] code {
  background: rgba(215, 122, 101, 0.13);
  border-color: rgba(215, 122, 101, 0.22);
}

html[data-theme="dark"] .leaflet-container {
  background: #202720;
}

html[data-theme="dark"] .leaflet-popup-content-wrapper,
html[data-theme="dark"] .leaflet-popup-tip {
  background: #201915;
  color: var(--ink);
}

html[data-theme="dark"] .leaflet-bar a {
  background: #201915;
  border-bottom-color: var(--line);
  color: var(--ink);
}

html[data-theme="dark"] .leaflet-bar a:hover,
html[data-theme="dark"] .leaflet-bar a:focus {
  background: #2a211c;
}

@media (min-width: 860px) {
  .place-note.has-image {
    grid-template-columns: minmax(0, 1.25fr) minmax(220px, 0.75fr);
    align-items: start;
    column-gap: 18px;
  }

  .place-note.has-image > span,
  .place-note.has-image > strong,
  .place-note.has-image > p,
  .place-note.has-image > a {
    grid-column: 1;
  }

  .place-note.has-image .place-image {
    grid-column: 2;
    grid-row: 1 / span 5;
    margin-top: 0;
  }
}

@media (max-width: 920px) {
  .controls-section,
  .explorer,
  .detail-grid,
  .period-list {
    grid-template-columns: 1fr;
  }

  .controls-section {
    display: grid;
    align-items: start;
  }

  .filters {
    justify-content: stretch;
  }

  label,
  select,
  .search-input {
    width: 100%;
  }

  #map {
    min-height: 420px;
  }

  .timeline-panel {
    max-height: min(68vh, 520px);
    overflow: auto;
    -webkit-overflow-scrolling: touch;
  }
}

@media (max-width: 620px) {
  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero {
    min-height: 78vh;
  }

  .hero-content {
    margin-bottom: 40px;
  }

  .hero-copy {
    font-size: 1rem;
  }

  .nav-links {
    gap: 12px;
  }

  .source-list {
    grid-template-columns: 1fr;
  }

  .timeline-item {
    grid-template-columns: 58px 1fr;
  }
}

/* ─── 诗词原文 ─── */
.poem-original {
  display: grid;
  gap: 10px;
  margin: 0 0 22px;
  border: 1px solid rgba(138, 47, 42, 0.32);
  border-left: 4px solid var(--accent);
  border-radius: 8px;
  padding: 18px 20px;
  background: #fbf3e6;
}

.poem-original[hidden] {
  display: none;
}

.poem-original-label {
  color: var(--gold);
  font-family: Arial, "Microsoft YaHei", sans-serif;
  font-size: 0.74rem;
  font-weight: 800;
  letter-spacing: 0.18em;
}

.poem-original-text {
  margin: 0;
  white-space: pre-wrap;
  font-family: "Noto Serif SC", "Songti SC", Georgia, "Times New Roman", serif;
  font-size: clamp(1.08rem, 2.4vw, 1.32rem);
  line-height: 2.05;
  color: var(--ink);
  letter-spacing: 0.02em;
}

html[data-theme="dark"] .poem-original {
  background: #2a1d16;
}

/* ─── 时期分组的引导语 ─── */
.section-lead {
  max-width: 880px;
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 1rem;
}