:root {
  --bg: #061424;
  --panel: rgba(255,255,255,.08);
  --panel-strong: rgba(255,255,255,.12);
  --card: #0d2238;
  --card-2: #102b47;
  --text: #f7fbff;
  --muted: #a9c2d9;
  --line: rgba(255,255,255,.14);
  --warm: #f97316;
  --warm-2: #fb923c;
  --cool: #38bdf8;
  --neutral: #facc15;
  --green: #22c55e;
  --danger: #ef4444;
  --shadow: 0 24px 70px rgba(0,0,0,.32);
  --radius-lg: 28px;
  --radius-md: 20px;
  --radius-sm: 12px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 116px; }
body {
  margin: 0;
  background:
    radial-gradient(circle at top left, rgba(56,189,248,.22), transparent 34rem),
    radial-gradient(circle at 78% 9%, rgba(249,115,22,.2), transparent 30rem),
    linear-gradient(180deg, #061424 0%, #071a2d 45%, #061424 100%);
  color: var(--text);
  min-height: 100vh;
}

a { color: inherit; }
code {
  background: rgba(255,255,255,.09);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: .1rem .35rem;
}

.page-shell { width: min(1180px, calc(100% - 32px)); margin: 0 auto; }
.hero { padding: 106px 0 54px; }
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(6,20,36,.72);
  backdrop-filter: blur(16px);
  position: fixed;
  top: 14px;
  left: 50%;
  transform: translateX(-50%);
  width: min(1180px, calc(100% - 32px));
  z-index: 1000;
}
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.brand-mark {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--warm), var(--cool));
  color: #fff;
  font-weight: 900;
  letter-spacing: -.04em;
}
.brand strong { display: block; font-size: 1rem; }
.brand small { display: block; color: var(--muted); font-size: .78rem; margin-top: 1px; }
.nav-links { display: flex; align-items: center; justify-content: flex-end; flex-wrap: wrap; gap: 5px; }
.nav-links a {
  text-decoration: none;
  color: var(--muted);
  padding: .62rem .68rem;
  border-radius: 999px;
  font-size: .86rem;
}
.nav-links a:hover { background: rgba(255,255,255,.08); color: var(--text); }
.nav-toggle { display: none; }

.topbar-actions { display: flex; align-items: center; gap: 10px; margin-left: auto; }
.language-control {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: .82rem;
  font-weight: 800;
}
.language-select {
  appearance: none;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255,255,255,.08);
  color: var(--text);
  padding: .68rem 2rem .68rem .85rem;
  font-weight: 800;
  cursor: pointer;
  min-width: 138px;
  background-image:
    linear-gradient(45deg, transparent 50%, currentColor 50%),
    linear-gradient(135deg, currentColor 50%, transparent 50%);
  background-position:
    calc(100% - 15px) 50%,
    calc(100% - 10px) 50%;
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
}
.language-select option { color: #061424; background: #ffffff; }


.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(330px, .8fr);
  gap: 28px;
  align-items: stretch;
  padding-top: 24px;
}
.eyebrow {
  margin: 0 0 12px;
  color: #91d7ff;
  font-weight: 800;
  letter-spacing: .15em;
  text-transform: uppercase;
  font-size: .76rem;
}
.hero h1 {
  margin: 0;
  font-size: clamp(2.6rem, 7vw, 5.8rem);
  line-height: .92;
  letter-spacing: -.07em;
  max-width: 850px;
}
.hero-text {
  color: var(--muted);
  font-size: 1.12rem;
  line-height: 1.7;
  max-width: 680px;
  margin: 24px 0 0;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.button, .footer button, .nav-toggle {
  appearance: none;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: .9rem 1.15rem;
  font-weight: 800;
  cursor: pointer;
  text-decoration: none;
}
.button.primary { background: linear-gradient(135deg, var(--warm), #ef4444); color: white; border: 0; }
.button.ghost { background: rgba(255,255,255,.07); color: var(--text); }

.hero-panel, .chart-panel, .signal-panel, .metric-card, .model-card, .season-card, .acronym-card, .source-panel, .map-panel, .table-panel, .impact-card, .flow-panel, .flow-explainer, .infographic-card {
  border: 1px solid var(--line);
  background: var(--panel);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow);
}
.hero-panel {
  border-radius: var(--radius-lg);
  padding: 28px;
  align-self: stretch;
  min-height: 430px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  background:
    linear-gradient(160deg, rgba(249,115,22,.18), rgba(56,189,248,.09)),
    var(--panel);
}
.panel-header { display: flex; align-items: center; gap: 10px; color: var(--muted); font-weight: 700; }
.status-dot { width: 12px; height: 12px; border-radius: 999px; background: var(--neutral); box-shadow: 0 0 24px currentColor; }
.hero-panel h2 { font-size: clamp(2rem, 5vw, 3.4rem); line-height: .95; letter-spacing: -.06em; margin: 34px 0 0; }
.hero-panel p { color: #c2d8e9; line-height: 1.65; margin: 18px 0 26px; }
.meter { width: 100%; height: 14px; border-radius: 99px; background: rgba(255,255,255,.12); overflow: hidden; border: 1px solid rgba(255,255,255,.12); }
.meter-fill { height: 100%; border-radius: inherit; background: linear-gradient(90deg, #22c55e, #facc15, #f97316, #ef4444); transition: width .6s ease; }
.meter-labels { display: flex; justify-content: space-between; color: var(--muted); font-size: .82rem; margin-top: 8px; }

.section { padding: 52px 0; }
.section-heading { margin-bottom: 22px; }
.section-heading h2 { margin: 0; font-size: clamp(2rem, 4vw, 3.3rem); letter-spacing: -.055em; }
.section-heading p { color: var(--muted); max-width: 760px; line-height: 1.7; }
.cards { display: grid; gap: 16px; }
.cards.four { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.cards.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.metric-card { border-radius: var(--radius-md); padding: 22px; min-height: 150px; background: rgba(13,34,56,.86); }
.metric-card.accent-warm { background: linear-gradient(135deg, rgba(249,115,22,.34), rgba(13,34,56,.94)); }
.metric-label { display: block; color: var(--muted); font-weight: 750; font-size: .85rem; margin-bottom: 18px; }
.metric-card strong { display: block; font-size: clamp(1.7rem, 4vw, 2.9rem); line-height: 1; letter-spacing: -.055em; }
.metric-card small { display: block; color: var(--muted); margin-top: 12px; line-height: 1.4; }

.content-grid { display: grid; gap: 18px; margin-top: 18px; }
.content-grid.two-thirds { grid-template-columns: minmax(0, 2fr) minmax(290px, .9fr); }
.content-grid.half { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.content-grid.map-grid { grid-template-columns: minmax(0, 1.25fr) minmax(320px, .75fr); }
.content-grid.flow-grid { grid-template-columns: minmax(0, 1.45fr) minmax(300px, .55fr); }
.chart-panel, .signal-panel, .model-card, .season-card, .acronym-card, .source-panel, .map-panel, .table-panel, .flow-panel, .flow-explainer, .infographic-card { border-radius: var(--radius-lg); padding: 24px; }
.chart-header { display: flex; justify-content: space-between; gap: 14px; align-items: start; margin-bottom: 12px; }
.chart-header h3, .signal-panel h3, .table-panel h3, .source-panel h3, .model-card h3, .season-card h3, .acronym-card h3, .infographic-card h3 { margin: 0 0 6px; font-size: 1.35rem; letter-spacing: -.03em; }
.chart-header p, .model-card p, .season-card p, .acronym-card p, .infographic-card p { color: var(--muted); margin: 0; line-height: 1.6; }
.chip { display: inline-flex; align-items: center; padding: .45rem .7rem; border: 1px solid var(--line); border-radius: 999px; color: #cfeeff; background: rgba(56,189,248,.1); font-size: .82rem; font-weight: 800; white-space: nowrap; }
canvas { width: 100%; max-width: 100%; display: block; border-radius: 18px; background: rgba(2,10,22,.36); }
.signal-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 12px; }
.signal-list li {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255,255,255,.06);
  color: #dceeff;
  line-height: 1.5;
}
.signal-list li strong { color: white; display: block; margin-bottom: 4px; }
.model-card { display: grid; grid-template-columns: .45fr 1fr; gap: 24px; align-items: center; background: linear-gradient(135deg, rgba(56,189,248,.14), rgba(249,115,22,.12)); }
.model-card p:last-child { margin: 0; }
.season-card, .acronym-card { margin-top: 18px; background: linear-gradient(135deg, rgba(250,204,21,.10), rgba(56,189,248,.11)), var(--panel); }
.season-card h3, .acronym-card h3 { margin: 0 0 8px; }
.season-card p, .acronym-card p { color: var(--muted); line-height: 1.65; margin: 0 0 16px; }
.season-code-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; margin: 16px 0; }
.full-season-grid { grid-template-columns: repeat(6, minmax(0, 1fr)); }
.season-code-grid div { padding: 14px; border: 1px solid var(--line); border-radius: 16px; background: rgba(255,255,255,.06); }
.season-code-grid strong { display: block; color: #fff7ed; font-size: 1.25rem; letter-spacing: .03em; margin-bottom: 5px; }
.season-code-grid span { display: block; color: var(--muted); line-height: 1.4; }
.season-note { font-size: .95rem; }


.acronym-card { background: linear-gradient(135deg, rgba(14,165,233,.11), rgba(249,115,22,.10)), var(--panel); }
.acronym-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin: 16px 0 0;
}
.acronym-grid div {
  padding: 15px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255,255,255,.06);
  min-height: 132px;
}
.acronym-grid dt {
  color: #fff7ed;
  font-weight: 950;
  letter-spacing: .045em;
  margin-bottom: 8px;
}
.acronym-grid dd {
  color: var(--muted);
  line-height: 1.48;
  margin: 0;
  font-size: .94rem;
}

.infographic-card {
  background:
    radial-gradient(circle at 22% 26%, rgba(56,189,248,.18), transparent 28rem),
    radial-gradient(circle at 72% 36%, rgba(249,115,22,.18), transparent 24rem),
    rgba(13,34,56,.78);
  overflow: hidden;
}
.infographic-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(290px, .65fr);
  gap: 18px;
  align-items: stretch;
}
.walker-diagram {
  position: relative;
  border: 1px solid rgba(255,255,255,.13);
  border-radius: 24px;
  overflow: hidden;
  background: rgba(2,10,22,.30);
  min-height: 390px;
}
.walker-diagram svg { width: 100%; height: 100%; min-height: 390px; display: block; }
.info-pulse { animation: infoPulse 4.6s ease-in-out infinite; transform-origin: 52% 54%; }
.info-current { animation: infoDash 4.8s linear infinite; stroke-dasharray: 28 20; }
.info-wind { animation: infoDashReverse 6s linear infinite; }
.info-wave { animation: infoWave 5.6s ease-in-out infinite; }
.info-cloud { animation: cloudDrift 7s ease-in-out infinite; }
.info-thermocline { animation: thermoTilt 5.8s ease-in-out infinite; }
.infographic-side { display: grid; gap: 12px; }
.infographic-stat {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: rgba(255,255,255,.065);
}
.infographic-stat span {
  color: #91d7ff;
  font-size: .75rem;
  letter-spacing: .13em;
  text-transform: uppercase;
  font-weight: 900;
}
.infographic-stat strong {
  display: block;
  margin-top: 9px;
  font-size: 1.25rem;
  line-height: 1.1;
  color: #fff;
}
.infographic-stat p { margin: 10px 0 0; color: var(--muted); line-height: 1.55; }
.warm-stat { background: linear-gradient(135deg, rgba(249,115,22,.20), rgba(255,255,255,.045)); }
.cool-stat { background: linear-gradient(135deg, rgba(56,189,248,.17), rgba(255,255,255,.045)); }
.infographic-pipeline {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 28px minmax(0, 1fr) 28px minmax(0, 1fr) 28px minmax(0, 1fr) 28px minmax(0, 1fr);
  gap: 8px;
  align-items: center;
  margin-top: 18px;
}
.infographic-pipeline span {
  min-height: 58px;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255,255,255,.07);
  color: #e8f5ff;
  font-weight: 850;
  line-height: 1.25;
}
.infographic-pipeline b {
  position: relative;
  height: 2px;
  background: linear-gradient(90deg, rgba(249,115,22,.2), rgba(249,115,22,.95));
}
.infographic-pipeline b::after {
  content: '';
  position: absolute;
  right: -1px;
  top: 50%;
  width: 9px;
  height: 9px;
  border-top: 2px solid rgba(249,115,22,.95);
  border-right: 2px solid rgba(249,115,22,.95);
  transform: translateY(-50%) rotate(45deg);
}
@keyframes infoPulse { 0%,100% { transform: scale(0.98); opacity: .84; } 50% { transform: scale(1.04); opacity: 1; } }
@keyframes infoDash { to { stroke-dashoffset: -96; } }
@keyframes infoDashReverse { to { stroke-dashoffset: 120; } }
@keyframes infoWave { 0%,100% { transform: translateY(0); } 50% { transform: translateY(8px); } }
@keyframes cloudDrift { 0%,100% { transform: translateX(-8px); } 50% { transform: translateX(22px); } }
@keyframes thermoTilt { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-8px); } }

.flow-panel { background: linear-gradient(160deg, rgba(14,165,233,.13), rgba(249,115,22,.12)), var(--panel); }
.flow-header { margin-bottom: 16px; }
.flow-map-shell {
  position: relative;
  overflow: hidden;
  border-radius: 22px;
  border: 1px solid rgba(255,255,255,.12);
  background: #061a30;
  min-height: 420px;
}
.flow-map-shell canvas {
  width: 100%;
  height: clamp(420px, 48vw, 560px);
  min-height: 420px;
  display: block;
  border-radius: 0;
  background: #061a30;
}
.flow-map-label {
  position: absolute;
  z-index: 2;
  padding: .45rem .62rem;
  border: 1px solid rgba(255,255,255,.18);
  border-radius: 999px;
  background: rgba(6,20,36,.72);
  color: #dff7ff;
  font-size: .76rem;
  font-weight: 850;
  backdrop-filter: blur(10px);
  box-shadow: 0 10px 30px rgba(0,0,0,.22);
  pointer-events: none;
}
.flow-label-west { left: 9%; top: 24%; }
.flow-label-east { right: 8%; top: 30%; }
.flow-label-equator { left: 47%; top: 50%; color: #fff7ed; }
.flow-label-region { left: 5%; bottom: 12%; }
.flow-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 14px;
  color: var(--muted);
  line-height: 1.5;
}
.flow-controls button {
  appearance: none;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: .72rem 1rem;
  font-weight: 850;
  cursor: pointer;
  background: rgba(255,255,255,.08);
  color: var(--text);
}
.flow-explainer { background: rgba(13,34,56,.78); }
.flow-explainer h3 { margin: 0 0 16px; font-size: 1.35rem; letter-spacing: -.03em; }
.flow-steps {
  list-style: none;
  counter-reset: flow-step;
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
}
.flow-steps li {
  counter-increment: flow-step;
  position: relative;
  padding: 14px 14px 14px 48px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255,255,255,.06);
  color: var(--muted);
  line-height: 1.55;
}
.flow-steps li::before {
  content: counter(flow-step);
  position: absolute;
  left: 14px;
  top: 14px;
  width: 24px;
  height: 24px;
  display: grid;
  place-items: center;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--warm), var(--cool));
  color: white;
  font-weight: 900;
  font-size: .78rem;
}
.flow-steps strong { display: block; color: white; margin-bottom: 4px; }
.flow-steps span { display: block; }

.map-panel { padding: 0; overflow: hidden; background: #071d3d; }
.map-panel svg { width: 100%; height: 100%; min-height: 360px; display: block; }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 14px 12px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
th { color: #cfeeff; font-size: .82rem; text-transform: uppercase; letter-spacing: .08em; }
td { color: #e8f5ff; line-height: 1.45; }
.impact-card { border-radius: var(--radius-md); padding: 22px; background: rgba(13,34,56,.78); }
.impact-card h3 { margin: 0 0 10px; font-size: 1.2rem; }
.impact-card p { color: var(--muted); line-height: 1.65; margin: 0; }
.source-panel ul, .source-panel ol { color: var(--muted); line-height: 1.8; padding-left: 1.25rem; }
.source-panel a { color: #9ee4ff; }
.footer {
  border-top: 1px solid var(--line);
  padding: 28px 0 46px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  color: var(--muted);
}
.footer button { background: rgba(255,255,255,.08); color: var(--text); }

@media (max-width: 920px) {
  .cards.four, .content-grid.two-thirds, .content-grid.half, .content-grid.map-grid, .content-grid.flow-grid, .infographic-wrap { grid-template-columns: 1fr; }
  .cards.three { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .hero-grid { grid-template-columns: 1fr; }
  .model-card { grid-template-columns: 1fr; }
  .season-code-grid, .full-season-grid, .acronym-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .infographic-pipeline { grid-template-columns: 1fr; }
  .infographic-pipeline b { height: 24px; width: 2px; margin: 0 auto; background: linear-gradient(180deg, rgba(249,115,22,.2), rgba(249,115,22,.95)); }
  .infographic-pipeline b::after { right: auto; left: 50%; top: auto; bottom: -2px; transform: translateX(-50%) rotate(135deg); }
  .nav-toggle { display: inline-flex; background: rgba(255,255,255,.08); color: white; }
  .language-control span { display: none; }
  .language-select { min-width: 118px; padding-top: .62rem; padding-bottom: .62rem; }
  .nav-links {
    display: none;
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    right: 0;
    padding: 12px;
    background: rgba(6,20,36,.95);
    border: 1px solid var(--line);
    border-radius: 24px;
    box-shadow: var(--shadow);
  }
  .nav-links.open { display: grid; }
}

@media (max-width: 620px) {
  .page-shell { width: min(100% - 20px, 1180px); }
  .topbar { border-radius: 24px; width: calc(100% - 20px); top: 10px; }
  .brand small { display: none; }
  .topbar { gap: 10px; padding: 10px; }
  .topbar-actions { gap: 6px; }
  .language-select { min-width: 106px; max-width: 118px; font-size: .82rem; }
  .cards.three { grid-template-columns: 1fr; }
  .season-code-grid, .full-season-grid, .acronym-grid { grid-template-columns: 1fr; }
  .hero { padding-top: 100px; }
  .hero-grid { padding-top: 24px; }
  .hero-panel, .chart-panel, .signal-panel, .metric-card, .model-card, .season-card, .acronym-card, .source-panel, .table-panel, .flow-panel, .flow-explainer, .infographic-card { padding: 18px; }
  .flow-map-shell, .flow-map-shell canvas { min-height: 390px; height: 390px; }
  .flow-map-label { font-size: .68rem; }
  .footer { flex-direction: column; align-items: start; }
}