:root {
  color-scheme: light;
  --bg: #f3ead2;
  --paper: #fbf4e4;
  --paper-strong: #f8edd3;
  --ink: #26231d;
  --muted: #716757;
  --line: #d7c6a5;
  --line-soft: rgba(112, 93, 60, 0.18);
  --green: #2f6f5e;
  --green-soft: rgba(47, 111, 94, 0.13);
  --red: #b85c4a;
  --amber: #c58a2a;
  --shadow: 0 22px 60px rgba(82, 58, 23, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at 20% 10%, rgba(197, 138, 42, 0.12), transparent 34rem),
    linear-gradient(135deg, rgba(255, 255, 255, 0.24), transparent 28rem),
    var(--bg);
  color: var(--ink);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.58;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  content: "";
  opacity: 0.34;
  background-image:
    linear-gradient(rgba(89, 72, 42, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(89, 72, 42, 0.04) 1px, transparent 1px);
  background-size: 22px 22px;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input {
  font: inherit;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
  min-height: 76px;
  padding: 14px clamp(18px, 4vw, 56px);
  border-bottom: 1px solid var(--line-soft);
  background: rgba(243, 234, 210, 0.88);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 260px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border: 1px solid rgba(38, 35, 29, 0.85);
  border-radius: 50%;
  background: var(--ink);
  color: var(--paper);
  font-weight: 900;
}

.brand strong,
.brand small {
  display: block;
}

.brand small,
.nav-links,
.eyebrow,
.hero-copy p,
.chart-header p,
.section-heading p,
.panel-note,
.hero-number small,
.mini-metrics span,
.insight-card p,
.year-readout small,
.narrative-card p,
.sources-grid p,
.future-card p {
  color: var(--muted);
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: clamp(12px, 2.4vw, 28px);
  font-size: 0.94rem;
}

.nav-links a {
  padding: 8px 0;
  border-bottom: 2px solid transparent;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  border-color: var(--green);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 430px);
  gap: clamp(24px, 5vw, 72px);
  align-items: end;
  min-height: calc(100vh - 76px);
  padding: clamp(48px, 8vw, 96px) clamp(18px, 4vw, 56px) clamp(36px, 6vw, 74px);
}

.province-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 390px);
  gap: clamp(24px, 5vw, 70px);
  align-items: end;
  padding: clamp(48px, 8vw, 96px) clamp(18px, 4vw, 56px) clamp(36px, 6vw, 72px);
}

.province-hero p {
  max-width: 760px;
  color: var(--muted);
  font-size: clamp(1rem, 2vw, 1.16rem);
}

.province-summary {
  padding: 22px;
  border: 1px solid var(--line-soft);
  border-radius: 8px;
  background: rgba(251, 244, 228, 0.78);
  box-shadow: var(--shadow);
}

.province-summary > span,
.detail-region {
  display: block;
  margin-bottom: 10px;
  color: var(--green);
  font-size: 0.78rem;
  font-weight: 900;
  text-transform: uppercase;
}

.province-summary > strong {
  display: block;
  font-size: clamp(3rem, 7vw, 5.4rem);
  line-height: 1;
}

.province-summary p,
.province-summary small {
  color: var(--muted);
}

.province-summary div {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 0;
  border-top: 1px solid var(--line-soft);
}

.province-summary b {
  text-align: right;
}

.hero-copy {
  max-width: 1040px;
}

.eyebrow {
  margin: 0 0 12px;
  font-size: 0.76rem;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 980px;
  margin-bottom: 22px;
  font-size: clamp(2.8rem, 7vw, 6.4rem);
  line-height: 1.02;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 12px;
  font-size: clamp(2rem, 4.6vw, 4.8rem);
  line-height: 1.02;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 8px;
  font-size: 1.08rem;
}

.hero-copy p {
  max-width: 720px;
  font-size: clamp(1rem, 2vw, 1.2rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.primary-link,
.secondary-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border: 1px solid var(--ink);
  border-radius: 999px;
  font-weight: 800;
}

.primary-link {
  background: var(--ink);
  color: var(--paper);
}

.secondary-link {
  background: rgba(251, 244, 228, 0.72);
}

.hero-panel,
.chart-card,
.insight-card,
.year-panel,
.pyramid-card,
.narrative-card,
.future-card,
.sources-grid article {
  border: 1px solid var(--line-soft);
  border-radius: 8px;
  background: rgba(251, 244, 228, 0.78);
  box-shadow: var(--shadow);
}

.hero-panel {
  padding: 24px;
}

.hero-number {
  padding: 20px 0;
  border-bottom: 1px solid var(--line-soft);
}

.hero-number span {
  display: block;
  font-size: clamp(3rem, 7vw, 5.6rem);
  font-weight: 900;
  line-height: 1;
}

.hero-number small {
  display: block;
  margin-top: 8px;
}

.mini-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  padding-top: 18px;
}

.mini-metrics div {
  min-height: 82px;
  padding: 12px;
  border: 1px solid var(--line-soft);
  border-radius: 8px;
  background: rgba(248, 237, 211, 0.72);
}

.mini-metrics strong,
.mini-metrics span {
  display: block;
}

.mini-metrics strong {
  font-size: 1.35rem;
  line-height: 1.1;
}

.section-shell {
  padding: clamp(54px, 8vw, 98px) clamp(18px, 4vw, 56px);
  border-top: 1px solid var(--line-soft);
}

.section-heading {
  max-width: 860px;
  margin-bottom: 28px;
}

.chart-card {
  padding: clamp(18px, 3vw, 28px);
}

.chart-card--wide {
  overflow: hidden;
}

.chart-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 14px;
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  color: var(--muted);
  font-size: 0.9rem;
}

.legend span {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.legend i {
  display: inline-block;
  width: 20px;
  height: 4px;
  border-radius: 999px;
}

.legend-total,
.legend-male {
  background: var(--green);
}

.legend-projection {
  background: var(--amber);
}

.legend-female {
  background: var(--red);
}

.line-chart,
.pyramid-chart {
  display: block;
  width: 100%;
  height: auto;
}

.compact {
  min-height: 220px;
}

.grid-line,
.center-line {
  stroke: var(--line);
  stroke-width: 1;
}

.marker-line {
  stroke: rgba(184, 92, 74, 0.44);
  stroke-width: 1;
}

.axis-label,
.marker-label,
.age-label {
  fill: var(--muted);
  font-size: 12px;
}

.age-label {
  fill: rgba(38, 35, 29, 0.72);
  font-size: 13px;
  font-weight: 800;
}

.trend-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(240px, 0.75fr) minmax(240px, 0.75fr);
  gap: 16px;
  margin-top: 16px;
}

.insight-card {
  padding: 22px;
}

.insight-card span,
.narrative-card span,
.future-card span {
  display: block;
  margin-bottom: 12px;
  color: var(--green);
  font-size: 0.78rem;
  font-weight: 900;
  text-transform: uppercase;
}

.structure-layout {
  display: grid;
  grid-template-columns: minmax(240px, 300px) minmax(0, 1fr) minmax(260px, 340px);
  gap: 16px;
  align-items: stretch;
}

.province-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 380px);
  gap: 16px;
}

.province-map-card,
.province-detail-card {
  border: 1px solid var(--line-soft);
  border-radius: 8px;
  background: rgba(251, 244, 228, 0.78);
  box-shadow: var(--shadow);
}

.province-map-card {
  padding: clamp(16px, 2.5vw, 24px);
}

.province-map {
  display: grid;
  grid-template-columns: repeat(8, minmax(72px, 1fr));
  grid-template-rows: repeat(8, minmax(58px, 1fr));
  gap: 8px;
  min-height: 520px;
}

.province-map-cell {
  min-width: 0;
  min-height: 58px;
  padding: 9px 8px;
  border: 1px solid rgba(47, 111, 94, 0.24);
  border-radius: 8px;
  background: rgba(47, 111, 94, var(--cell-alpha));
  color: var(--ink);
  cursor: pointer;
  text-align: left;
  transition:
    transform 0.18s ease,
    border-color 0.18s ease,
    box-shadow 0.18s ease;
}

.province-map-cell.is-old {
  box-shadow: inset 0 -4px 0 rgba(184, 92, 74, 0.5);
}

.province-map-cell.is-active,
.province-map-cell:hover {
  border-color: var(--ink);
  transform: translateY(-2px);
  box-shadow: 0 12px 24px rgba(82, 58, 23, 0.16);
}

.province-map-cell strong,
.province-map-cell span {
  display: block;
}

.province-map-cell strong {
  font-size: 0.98rem;
}

.province-map-cell span {
  color: rgba(38, 35, 29, 0.68);
  font-size: 0.78rem;
}

.province-detail-card {
  padding: 22px;
}

.province-detail-card h3 {
  margin-bottom: 8px;
  font-size: clamp(2rem, 4vw, 3.8rem);
  line-height: 1;
}

.detail-population {
  margin-bottom: 14px;
  font-size: clamp(2.2rem, 4vw, 4rem);
  font-weight: 900;
  line-height: 1;
}

.province-detail-card p {
  color: var(--muted);
}

.detail-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 18px 0;
}

.detail-metrics div {
  padding: 12px;
  border: 1px solid var(--line-soft);
  border-radius: 8px;
  background: rgba(248, 237, 211, 0.62);
}

.detail-metrics span,
.gender-labels {
  color: var(--muted);
  font-size: 0.88rem;
}

.detail-metrics strong,
.detail-metrics span {
  display: block;
}

.gender-split {
  display: flex;
  height: 16px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(112, 93, 60, 0.12);
}

.gender-split i,
.gender-split b {
  display: block;
  height: 100%;
}

.gender-split i,
.tile-fill i,
.ranking-track i {
  background: var(--green);
}

.gender-split b,
.tile-fill b {
  background: var(--red);
}

.gender-labels {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  margin-top: 8px;
}

.province-ranking {
  display: grid;
  gap: 8px;
}

.ranking-row {
  display: grid;
  grid-template-columns: 36px 78px minmax(0, 1fr) 96px;
  gap: 12px;
  align-items: center;
  min-height: 38px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  text-align: left;
}

.ranking-row:hover,
.ranking-row.is-active {
  background: rgba(47, 111, 94, 0.1);
}

.ranking-row span,
.ranking-row b {
  color: var(--muted);
}

.ranking-track {
  height: 14px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(112, 93, 60, 0.12);
}

.ranking-track i {
  display: block;
  height: 100%;
  border-radius: inherit;
}

.province-treemap {
  width: 100%;
  min-height: 520px;
}

.treemap-fallback {
  display: grid;
  place-items: center;
  min-height: 520px;
  border: 1px dashed var(--line);
  border-radius: 8px;
  color: var(--muted);
}

.year-panel,
.narrative-card {
  padding: 22px;
}

.year-readout span {
  display: block;
  font-size: 4rem;
  font-weight: 900;
  line-height: 1;
}

.slider-label {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin: 24px 0 8px;
  color: var(--muted);
  font-size: 0.92rem;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--green);
}

.mode-tabs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin: 20px 0;
}

.scenario-button {
  min-height: 38px;
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  background: rgba(248, 237, 211, 0.66);
  color: var(--muted);
  cursor: pointer;
}

.scenario-button.is-active {
  border-color: var(--green);
  background: var(--green);
  color: var(--paper);
  font-weight: 800;
}

.year-stats {
  display: grid;
  gap: 10px;
}

.year-stats div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line-soft);
}

.year-stats span {
  color: var(--muted);
}

.year-stats strong {
  font-size: 1.12rem;
}

.pyramid-card {
  min-width: 0;
  padding: clamp(16px, 2.5vw, 24px);
}

.pyramid-row rect {
  transition: opacity 0.18s ease;
}

.pyramid-row:hover rect {
  opacity: 0.7;
}

.age-bars {
  display: grid;
  gap: 14px;
  margin-top: 22px;
}

.age-bar {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr) 58px;
  gap: 10px;
  align-items: center;
  color: var(--muted);
  font-size: 0.92rem;
}

.age-bar div {
  height: 10px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(112, 93, 60, 0.12);
}

.age-bar i {
  display: block;
  height: 100%;
  border-radius: inherit;
}

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

.future-card,
.sources-grid article {
  padding: 22px;
}

.future-card strong {
  display: block;
  margin-bottom: 10px;
  font-size: clamp(2.3rem, 5vw, 4.5rem);
  line-height: 1;
}

.future-card.is-emphasis {
  background: var(--green);
  color: var(--paper);
}

.future-card.is-emphasis span,
.future-card.is-emphasis p {
  color: rgba(251, 244, 228, 0.78);
}

.tooltip {
  position: fixed;
  z-index: 50;
  display: none;
  min-width: 170px;
  padding: 10px 12px;
  border: 1px solid rgba(38, 35, 29, 0.22);
  border-radius: 8px;
  background: rgba(38, 35, 29, 0.94);
  color: var(--paper);
  pointer-events: none;
  box-shadow: 0 14px 38px rgba(38, 35, 29, 0.24);
}

.tooltip.is-visible {
  display: block;
}

.tooltip strong,
.tooltip span {
  display: block;
}

.tooltip span {
  color: rgba(251, 244, 228, 0.72);
  font-size: 0.9rem;
}

@media (max-width: 1100px) {
  .hero,
  .province-hero,
  .province-layout,
  .structure-layout,
  .trend-grid {
    grid-template-columns: 1fr;
  }

  .year-panel {
    display: grid;
    grid-template-columns: minmax(170px, 0.55fr) minmax(0, 1fr);
    gap: 18px;
  }

  .year-panel .mode-tabs,
  .year-panel .year-stats {
    grid-column: 1 / -1;
  }
}

@media (max-width: 920px) {
  .province-map {
    grid-template-columns: repeat(4, minmax(70px, 1fr));
    grid-auto-flow: dense;
    min-height: auto;
  }

  .province-map-cell {
    grid-column: auto !important;
    grid-row: auto !important;
  }

  .ranking-row {
    grid-template-columns: 30px 64px minmax(0, 1fr);
  }

  .ranking-row b {
    grid-column: 2 / -1;
    padding-bottom: 4px;
  }
}

@media (max-width: 760px) {
  .topbar {
    position: static;
    align-items: flex-start;
    flex-direction: column;
  }

  .brand {
    min-width: 0;
  }

  .nav-links {
    justify-content: flex-start;
  }

  .hero {
    min-height: auto;
  }

  .mini-metrics,
  .future-grid,
  .sources-grid,
  .detail-metrics {
    grid-template-columns: 1fr;
  }

  .chart-header {
    display: block;
  }

  .legend {
    margin-top: 10px;
  }

  .year-panel {
    display: block;
  }

  h1 {
    font-size: clamp(2.4rem, 12vw, 4rem);
  }

  .province-map {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .province-treemap {
    min-height: 680px;
  }
}