:root {
  color-scheme: light;
  --ink: #1d2623;
  --muted: #66706b;
  --paper: #f5f2ea;
  --card: #fffef9;
  --line: #d9d7cd;
  --accent: #d94f31;
  --accent-deep: #a73520;
  --teal: #1f6f68;
  --teal-soft: #dbe9e4;
  --gold: #b8862e;
  --shadow: 0 24px 70px rgba(40, 48, 43, 0.08);
  --radius: 24px;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at 85% 4%, rgba(210, 114, 75, 0.13), transparent 24rem),
    var(--paper);
  color: var(--ink);
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", system-ui, sans-serif;
  line-height: 1.5;
}

button,
select,
input {
  color: inherit;
  font: inherit;
}

button,
select {
  cursor: pointer;
}

a {
  color: inherit;
}

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 100;
  padding: 0.65rem 0.9rem;
  border-radius: 8px;
  background: var(--ink);
  color: white;
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header,
main,
footer {
  width: min(1180px, calc(100% - 40px));
  margin-inline: auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 84px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.05rem;
  font-weight: 750;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border-radius: 50%;
  background: var(--ink);
  color: var(--paper);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1rem;
}

.repository-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  border-bottom: 1px solid currentColor;
  color: var(--muted);
  font-size: 0.9rem;
  text-decoration: none;
}

.repository-link:hover {
  color: var(--ink);
}

.hero {
  display: grid;
  min-height: 520px;
  align-items: center;
  grid-template-columns: minmax(0, 1.25fr) minmax(320px, 0.75fr);
  gap: 5rem;
  padding: 4rem 1rem 6.5rem;
}

.eyebrow,
.section-kicker {
  margin: 0 0 0.75rem;
  color: var(--accent-deep);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.17em;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 760px;
  margin: 0;
  font-family: "Songti SC", SimSun, Georgia, serif;
  font-size: clamp(3rem, 7.1vw, 6.25rem);
  font-weight: 600;
  letter-spacing: -0.065em;
  line-height: 0.98;
}

.hero-summary {
  max-width: 620px;
  margin: 2rem 0 0;
  color: var(--muted);
  font-size: clamp(1rem, 1.4vw, 1.16rem);
}

.data-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem 1.4rem;
  margin-top: 2rem;
  color: var(--muted);
  font-size: 0.84rem;
}

.data-facts span {
  position: relative;
}

.data-facts span:not(:last-child)::after {
  position: absolute;
  top: 50%;
  right: -0.8rem;
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--accent);
  content: "";
}

.hero-orbit {
  position: relative;
  width: min(100%, 390px);
  aspect-ratio: 1;
  justify-self: center;
}

.orbit-ring,
.orbit-core,
.orbit-label {
  position: absolute;
  border-radius: 50%;
}

.orbit-ring {
  inset: 0;
  border: 1px solid rgba(29, 38, 35, 0.22);
}

.orbit-ring::before,
.orbit-ring::after {
  position: absolute;
  border-radius: 50%;
  background: var(--accent);
  content: "";
}

.orbit-ring::before {
  top: 11%;
  left: 18%;
  width: 10px;
  height: 10px;
}

.orbit-ring::after {
  right: 4%;
  bottom: 25%;
  width: 7px;
  height: 7px;
}

.orbit-ring-inner {
  inset: 19%;
  border-style: dashed;
  border-color: rgba(29, 38, 35, 0.28);
}

.orbit-ring-inner::before {
  top: auto;
  bottom: -3px;
  left: 50%;
  width: 8px;
  height: 8px;
  background: var(--teal);
}

.orbit-ring-inner::after {
  display: none;
}

.orbit-core {
  inset: 32%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  background: var(--ink);
  box-shadow: 0 28px 50px rgba(29, 38, 35, 0.2);
  color: white;
}

.orbit-core span {
  color: rgba(255, 255, 255, 0.62);
  font-size: 0.72rem;
}

.orbit-core strong {
  margin-top: 0.15rem;
  font-family: Georgia, serif;
  font-size: 1.3rem;
}

.orbit-label {
  padding: 0.48rem 0.7rem;
  border: 1px solid var(--line);
  background: var(--card);
  box-shadow: 0 8px 24px rgba(29, 38, 35, 0.08);
  font-size: 0.78rem;
}

.orbit-label-a {
  top: 4%;
  right: 12%;
}

.orbit-label-b {
  right: -2%;
  bottom: 17%;
}

.orbit-label-c {
  bottom: 3%;
  left: 10%;
}

.control-panel {
  position: sticky;
  z-index: 20;
  top: 12px;
  display: grid;
  align-items: end;
  grid-template-columns: 1fr 1.25fr 1.8fr 1.2fr 0.75fr;
  gap: 0.65rem;
  padding: 1rem;
  border: 1px solid rgba(217, 215, 205, 0.85);
  border-radius: 20px;
  background: rgba(255, 254, 249, 0.9);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.control-field {
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

.control-field > span,
.control-field > .control-label,
.control-field legend {
  display: block;
  margin: 0 0 0.42rem 0.35rem;
  padding: 0;
  color: var(--muted);
  font-size: 0.69rem;
  font-weight: 750;
  letter-spacing: 0.08em;
}

select,
.segment-control,
.search-field input,
.city-picker input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #f9f7f0;
}

select,
.city-picker input {
  min-height: 46px;
  padding: 0 2.2rem 0 0.8rem;
}

.city-picker {
  position: relative;
}

.city-picker input {
  padding-right: 2.8rem;
  outline: none;
}

.city-picker input:focus {
  border-color: var(--teal);
  box-shadow: 0 0 0 3px rgba(31, 111, 104, 0.12);
}

.city-toggle {
  position: absolute;
  top: 50%;
  right: 0.45rem;
  display: grid;
  width: 32px;
  height: 32px;
  padding: 0;
  place-items: center;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--muted);
  font-size: 1.15rem;
  transform: translateY(-50%);
}

.city-toggle:hover,
.city-toggle:focus-visible {
  background: #e9e6dd;
  color: var(--ink);
  outline: none;
}

.city-options {
  position: absolute;
  z-index: 30;
  top: calc(100% + 0.45rem);
  left: 0;
  width: min(320px, 90vw);
  max-height: 300px;
  padding: 0.4rem;
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 13px;
  background: var(--card);
  box-shadow: 0 18px 50px rgba(29, 38, 35, 0.18);
}

.city-option,
.city-option-empty {
  width: 100%;
  padding: 0.65rem 0.7rem;
  border: 0;
  border-radius: 8px;
  background: transparent;
  text-align: left;
}

.city-option {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.city-option:hover,
.city-option.active {
  background: #eeebe2;
}

.city-option[aria-selected="true"] {
  color: var(--accent-deep);
  font-weight: 750;
}

.city-option small {
  color: var(--muted);
  font-size: 0.68rem;
}

.city-option-empty {
  color: var(--muted);
  font-size: 0.8rem;
}

.segment-control {
  display: flex;
  min-height: 46px;
  padding: 4px;
}

.segment-control button {
  flex: 1;
  padding: 0.45rem 0.6rem;
  border: 0;
  border-radius: 9px;
  background: transparent;
  color: var(--muted);
  font-size: 0.83rem;
  font-weight: 650;
}

.segment-control button.active {
  background: var(--ink);
  box-shadow: 0 3px 9px rgba(29, 38, 35, 0.16);
  color: white;
}

.area-segments button {
  padding-inline: 0.35rem;
  font-size: 0.74rem;
}

.page-status {
  display: grid;
  min-height: 300px;
  place-items: center;
  color: var(--muted);
}

.overview-grid {
  display: grid;
  grid-template-columns: minmax(0, 2.1fr) minmax(260px, 0.9fr);
  gap: 1rem;
  margin-top: 1rem;
}

.chart-card,
.latest-card,
.snapshot-section,
.ranking-section,
.history-section,
.method-section {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--card);
}

.chart-card {
  min-width: 0;
  padding: clamp(1.2rem, 3vw, 2rem);
}

.latest-card {
  display: flex;
  min-height: 430px;
  padding: 2rem;
  flex-direction: column;
  background: var(--ink);
  color: white;
}

.latest-card .section-kicker {
  color: #f39a7e;
}

.latest-card h2 {
  margin: 0;
  font-size: 1.15rem;
}

.latest-month {
  margin: 0.3rem 0 2rem;
  color: rgba(255, 255, 255, 0.55);
  font-size: 0.82rem;
}

.latest-value-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.latest-value-row strong {
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(3.8rem, 7vw, 5.8rem);
  font-weight: 500;
  letter-spacing: -0.06em;
  line-height: 1;
}

.status-pill {
  padding: 0.35rem 0.65rem;
  border-radius: 99px;
  background: rgba(255, 255, 255, 0.1);
  font-size: 0.75rem;
}

.status-pill.up {
  background: rgba(239, 134, 104, 0.22);
  color: #ffc5b5;
}

.status-pill.down {
  background: rgba(92, 177, 168, 0.2);
  color: #a6e0d9;
}

.latest-explanation {
  margin: 1.4rem 0 1.8rem;
  color: rgba(255, 255, 255, 0.72);
}

.latest-details {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin: auto 0 0;
}

.latest-details div {
  padding-top: 1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.13);
}

.latest-details dt {
  color: rgba(255, 255, 255, 0.48);
  font-size: 0.7rem;
}

.latest-details dd {
  margin: 0.35rem 0 0;
  font-weight: 700;
}

.index-note {
  margin: 1.5rem 0 0;
  color: rgba(255, 255, 255, 0.4);
  font-size: 0.72rem;
}

.section-heading {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
}

.section-heading h2 {
  margin: 0;
  font-family: "Songti SC", SimSun, Georgia, serif;
  font-size: clamp(1.65rem, 3vw, 2.35rem);
  font-weight: 600;
}

.chart-legend {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.45rem 1rem;
  color: var(--muted);
  font-size: 0.72rem;
}

.chart-legend span {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.legend-line,
.legend-benchmark {
  display: inline-block;
  width: 18px;
  height: 2px;
  background: var(--accent);
}

.legend-benchmark {
  border-top: 1px dashed var(--muted);
  background: none;
}

.chart-wrap {
  position: relative;
  height: 340px;
  margin-top: 2rem;
}

#trend-chart {
  width: 100%;
  height: 100%;
}

.chart-note {
  margin: 1rem 0 0;
  padding-left: 0.75rem;
  border-left: 2px solid rgba(217, 79, 49, 0.45);
  color: var(--muted);
  font-size: 0.74rem;
  line-height: 1.6;
}

#dashboard.is-loading .chart-card,
#dashboard.is-loading .latest-card,
#dashboard.is-loading .snapshot-section,
#dashboard.is-loading .history-section {
  opacity: 0.55;
  transition: opacity 0.15s ease;
}

.chart-tooltip {
  position: absolute;
  z-index: 3;
  min-width: 112px;
  padding: 0.55rem 0.7rem;
  border-radius: 9px;
  background: var(--ink);
  box-shadow: 0 8px 25px rgba(29, 38, 35, 0.22);
  color: white;
  font-size: 0.72rem;
  pointer-events: none;
  transform: translate(-50%, calc(-100% - 12px));
}

.chart-tooltip strong {
  display: block;
  margin-top: 0.1rem;
  font-family: Georgia, serif;
  font-size: 1rem;
}

.snapshot-section {
  margin-top: 5.5rem;
  padding: clamp(1.4rem, 4vw, 2.5rem);
  background: #e2ebe6;
}

.snapshot-context {
  display: flex;
  align-items: flex-end;
  flex-direction: column;
}

.snapshot-context strong {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.25rem;
  font-weight: 600;
}

.snapshot-context span {
  margin-top: 0.2rem;
  padding: 0.22rem 0.55rem;
  border-radius: 99px;
  background: var(--teal);
  color: white;
  font-size: 0.68rem;
}

.snapshot-intro {
  max-width: 650px;
  margin: 0.8rem 0 0;
  color: var(--muted);
  font-size: 0.86rem;
}

.snapshot-groups {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 2rem;
}

.snapshot-market {
  padding: 1.25rem;
  border: 1px solid rgba(31, 111, 104, 0.14);
  border-radius: 18px;
  background: rgba(255, 254, 249, 0.72);
}

.snapshot-market-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.85rem;
}

.snapshot-market-heading h3 {
  margin: 0;
  font-family: "Songti SC", SimSun, Georgia, serif;
  font-size: 1.15rem;
}

.snapshot-market-heading span {
  color: var(--muted);
  font-size: 0.65rem;
}

.snapshot-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.6rem;
}

.snapshot-metric {
  display: flex;
  min-width: 0;
  padding: 0.9rem;
  border: 1px solid #dcded7;
  border-radius: 13px;
  background: var(--card);
  color: var(--ink);
  text-align: left;
  flex-direction: column;
}

.snapshot-metric:hover {
  border-color: rgba(31, 111, 104, 0.55);
  transform: translateY(-1px);
}

.snapshot-metric.active {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(217, 79, 49, 0.11);
}

.snapshot-metric-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.4rem;
  color: var(--muted);
  font-size: 0.71rem;
}

.snapshot-state {
  white-space: nowrap;
  font-weight: 700;
}

.snapshot-metric strong {
  margin-top: 0.75rem;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 2rem;
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1;
}

.snapshot-metric small {
  margin-top: 0.45rem;
  font-size: 0.65rem;
}

.market-section {
  padding: 5.5rem 0 1rem;
}

.section-caption {
  max-width: 420px;
  margin: 0;
  color: var(--muted);
  font-size: 0.85rem;
  text-align: right;
}

.temperature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: 2rem;
}

.temperature-card {
  min-height: 190px;
  padding: 1.5rem;
  border-radius: 18px;
}

.temperature-card span {
  font-size: 0.78rem;
  font-weight: 750;
}

.temperature-card strong {
  display: block;
  margin-top: 1.6rem;
  font-family: Georgia, serif;
  font-size: 3.8rem;
  font-weight: 500;
  line-height: 1;
}

.temperature-card p {
  margin: 0.6rem 0 0;
  color: var(--muted);
  font-size: 0.78rem;
}

.temperature-card.rising {
  background: #f6ded4;
  color: #9d351f;
}

.temperature-card.flat {
  background: #eae5d7;
  color: #665b40;
}

.temperature-card.falling {
  background: var(--teal-soft);
  color: #1f625c;
}

.ranking-section,
.history-section,
.method-section {
  margin-top: 5.5rem;
  padding: clamp(1.25rem, 4vw, 2.4rem);
}

.search-field input {
  min-width: 220px;
  padding: 0.72rem 0.9rem;
  outline: none;
}

.search-field input:focus {
  border-color: var(--teal);
  box-shadow: 0 0 0 3px rgba(31, 111, 104, 0.12);
}

.table-shell {
  max-height: 560px;
  margin-top: 1.8rem;
  overflow: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th,
td {
  padding: 0.85rem 0.7rem;
  border-bottom: 1px solid #e8e5dc;
  text-align: left;
}

th {
  position: sticky;
  z-index: 1;
  top: 0;
  background: var(--card);
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 750;
  letter-spacing: 0.06em;
}

td {
  font-size: 0.88rem;
}

.city-row {
  cursor: pointer;
}

.city-row:hover,
.city-row:focus {
  background: #f3f0e8;
  outline: none;
}

.rank-number {
  width: 70px;
  color: var(--muted);
  font-family: Georgia, serif;
}

.city-name-cell {
  font-weight: 750;
}

.index-cell {
  font-family: Georgia, serif;
  font-size: 1.08rem;
  font-weight: 700;
}

.direction-up {
  color: var(--accent-deep);
}

.direction-down {
  color: var(--teal);
}

.direction-flat {
  color: var(--gold);
}

.state-dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  margin-right: 0.45rem;
  border-radius: 50%;
  background: currentColor;
}

.empty-state {
  padding: 3rem;
  color: var(--muted);
  text-align: center;
}

.download-link {
  color: var(--teal);
  font-size: 0.86rem;
  font-weight: 700;
  text-underline-offset: 4px;
}

.history-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.65rem;
  margin-top: 2rem;
}

.history-item {
  padding: 1rem;
  border: 1px solid #e5e1d6;
  border-radius: 13px;
  background: #faf8f2;
}

.history-item span {
  display: block;
  color: var(--muted);
  font-size: 0.7rem;
}

.history-item strong {
  display: inline-block;
  margin-top: 0.45rem;
  font-family: Georgia, serif;
  font-size: 1.45rem;
}

.history-item em {
  margin-left: 0.35rem;
  font-size: 0.72rem;
  font-style: normal;
}

.method-section {
  margin-bottom: 5.5rem;
  background: #ece7da;
}

.method-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  margin-top: 2rem;
}

.method-grid p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.method-grid strong {
  display: block;
  margin-bottom: 0.45rem;
  color: var(--ink);
  font-size: 1rem;
}

.city-index {
  margin-top: 4.5rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--line);
}

.city-index h2 {
  margin: 0;
  font-family: "Songti SC", SimSun, Georgia, serif;
  font-size: 1.35rem;
  font-weight: 600;
}

.city-index p {
  margin: 0.5rem 0 1.4rem;
  color: var(--muted);
  font-size: 0.85rem;
}

.city-index ul {
  display: flex;
  margin: 0;
  padding: 0;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
}

.city-index a {
  display: inline-block;
  padding: 0.35rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--card);
  font-size: 0.85rem;
  text-decoration: none;
}

.city-index a:hover {
  border-color: var(--ink);
}

footer {
  display: flex;
  justify-content: space-between;
  padding: 2rem 0 3rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.75rem;
}

footer p {
  margin: 0;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 900px) {
  .hero {
    min-height: auto;
    grid-template-columns: 1fr;
    gap: 2rem;
    padding-block: 4rem;
  }

  .hero-orbit {
    display: none;
  }

  .control-panel {
    position: static;
    grid-template-columns: 1fr 1fr;
  }

  .area-control {
    grid-column: 1 / -1;
  }

  .overview-grid {
    grid-template-columns: 1fr;
  }

  .snapshot-groups {
    grid-template-columns: 1fr;
  }

  .latest-card {
    min-height: 390px;
  }

  .history-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .method-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 650px) {
  .site-header,
  main,
  footer {
    width: min(100% - 24px, 1180px);
  }

  .site-header {
    min-height: 72px;
  }

  .hero {
    padding: 3.2rem 0 4rem;
  }

  .hero h1 {
    font-size: clamp(3.25rem, 16vw, 4.7rem);
  }

  .data-facts {
    display: grid;
    gap: 0.35rem;
  }

  .data-facts span::after {
    display: none;
  }

  .control-panel {
    grid-template-columns: 1fr;
  }

  .overview-grid {
    margin-top: 0.75rem;
  }

  .chart-heading,
  .section-heading:not(.snapshot-heading) {
    align-items: flex-start;
    flex-direction: column;
  }

  .snapshot-heading {
    align-items: flex-start;
    flex-direction: column;
  }

  .snapshot-context {
    align-items: flex-start;
  }

  .chart-legend {
    justify-content: flex-start;
  }

  .chart-wrap {
    height: 290px;
    margin-top: 1.5rem;
  }

  .latest-card {
    min-height: 370px;
    padding: 1.5rem;
  }

  .market-section {
    padding-top: 4.5rem;
  }

  .section-caption {
    text-align: left;
  }

  .temperature-grid {
    grid-template-columns: 1fr;
  }

  .temperature-card {
    min-height: 132px;
  }

  .temperature-card strong {
    margin-top: 0.8rem;
    font-size: 3rem;
  }

  .ranking-section,
  .history-section,
  .method-section {
    margin-top: 3.5rem;
  }

  .ranking-heading,
  .search-field,
  .search-field input {
    width: 100%;
  }

  th,
  td {
    padding-inline: 0.45rem;
  }

  th:first-child,
  td:first-child {
    display: none;
  }

  .history-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .method-grid {
    grid-template-columns: 1fr;
    gap: 1.35rem;
  }

  footer {
    gap: 0.5rem;
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}