:root {
  --green-950: #001f0f;
  --green-900: #003b1f;
  --green-800: #005a31;
  --green-700: #007a43;
  --green-600: #009b56;
  --green-500: #00bd69;
  --green-400: #29d981;
  --green-300: #6df0a7;
  --green-200: #a7f7c7;
  --green-100: #d9ffe8;
  --green-050: #f0fff5;
  --line: rgba(0, 122, 67, 0.22);
  --shadow: 0 24px 70px rgba(0, 59, 31, 0.16);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--green-950);
  background:
    radial-gradient(circle at 84% 12%, rgba(41, 217, 129, 0.32), transparent 28rem),
    radial-gradient(circle at 10% 20%, rgba(109, 240, 167, 0.28), transparent 22rem),
    linear-gradient(180deg, var(--green-050) 0%, #e8fff0 48%, #dfffe9 100%);
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px clamp(20px, 5vw, 72px);
  background: rgba(240, 255, 245, 0.86);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(18px);
}

.brand {
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--green-900);
}

nav {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

nav a {
  padding: 8px 12px;
  border: 1px solid transparent;
  border-radius: 999px;
  color: var(--green-800);
  font-size: 14px;
  font-weight: 700;
}

nav a:hover {
  border-color: var(--green-300);
  background: rgba(167, 247, 199, 0.34);
}

main {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
}

.hero {
  min-height: calc(100vh - 74px);
  display: grid;
  grid-template-columns: minmax(0, 1.14fr) minmax(320px, 0.86fr);
  align-items: center;
  gap: clamp(28px, 5vw, 72px);
  padding: 64px 0 76px;
}

.hero-copy {
  max-width: 760px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--green-700);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

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

h1 {
  margin-bottom: 24px;
  color: var(--green-950);
  font-size: clamp(44px, 7vw, 88px);
  line-height: 0.98;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 18px;
  color: var(--green-950);
  font-size: clamp(30px, 4vw, 52px);
  line-height: 1.08;
}

h3 {
  margin-bottom: 12px;
  color: var(--green-900);
  font-size: 22px;
}

.lead {
  max-width: 680px;
  margin-bottom: 30px;
  color: var(--green-800);
  font-size: clamp(18px, 2.1vw, 23px);
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border: 1px solid var(--green-600);
  border-radius: 999px;
  font-weight: 900;
}

.button.primary {
  color: var(--green-050);
  background: var(--green-800);
  box-shadow: 0 14px 32px rgba(0, 90, 49, 0.26);
}

.button.secondary {
  color: var(--green-800);
  background: rgba(217, 255, 232, 0.72);
}

.signal-panel,
.insight-grid article,
.model-list article,
.risk-card,
.timeline article,
.contact-card,
.sources {
  border: 1px solid var(--line);
  background: rgba(240, 255, 245, 0.74);
  box-shadow: var(--shadow);
}

.signal-panel {
  padding: clamp(24px, 4vw, 36px);
  border-radius: 8px;
}

.signal-top {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 16px;
  margin-bottom: 22px;
}

.signal-top span,
small {
  color: var(--green-700);
  font-size: 13px;
  font-weight: 800;
}

.signal-top strong {
  color: var(--green-900);
  font-size: clamp(32px, 5vw, 58px);
  line-height: 1;
}

.meter {
  height: 18px;
  overflow: hidden;
  border: 1px solid var(--green-400);
  border-radius: 999px;
  background: var(--green-100);
}

.meter span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--green-700), var(--green-400));
}

.signal-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-top: 22px;
}

.signal-grid div {
  min-height: 104px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(217, 255, 232, 0.54);
}

.signal-grid strong {
  display: block;
  margin-top: 10px;
  color: var(--green-800);
  font-size: 28px;
}

.section {
  padding: 84px 0;
}

.section-head {
  max-width: 760px;
  margin-bottom: 32px;
}

.section-note,
.section p {
  color: var(--green-800);
  line-height: 1.75;
}

.insight-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.insight-grid article {
  min-height: 290px;
  padding: 26px;
  border-radius: 8px;
}

.index {
  display: inline-grid;
  place-items: center;
  width: 48px;
  height: 48px;
  margin-bottom: 30px;
  border-radius: 50%;
  color: var(--green-050);
  background: var(--green-700);
  font-weight: 900;
}

.split {
  display: grid;
  grid-template-columns: minmax(260px, 0.78fr) minmax(0, 1.22fr);
  gap: clamp(28px, 5vw, 64px);
  align-items: start;
}

.model-list {
  display: grid;
  gap: 16px;
}

.model-list article {
  padding: 24px;
  border-radius: 8px;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

.tags span {
  padding: 7px 10px;
  border: 1px solid var(--green-300);
  border-radius: 999px;
  color: var(--green-800);
  background: rgba(217, 255, 232, 0.7);
  font-size: 13px;
  font-weight: 800;
}

.risk-section {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.risk-board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.risk-card {
  position: relative;
  overflow: hidden;
  min-height: 260px;
  padding: 28px;
  border-radius: 8px;
}

.risk-card::after {
  content: "";
  position: absolute;
  right: -38px;
  bottom: -38px;
  width: 124px;
  height: 124px;
  border: 18px solid rgba(0, 154, 86, 0.18);
  border-radius: 50%;
}

.risk-card span,
.timeline span {
  display: inline-block;
  margin-bottom: 18px;
  color: var(--green-700);
  font-size: 13px;
  font-weight: 900;
}

.risk-card.low {
  background: rgba(217, 255, 232, 0.86);
}

.risk-card.mid {
  background: rgba(167, 247, 199, 0.78);
}

.risk-card.high {
  color: var(--green-050);
  background: var(--green-800);
}

.risk-card.high h3,
.risk-card.high p,
.risk-card.high span {
  color: var(--green-050);
}

.future {
  display: grid;
  grid-template-columns: minmax(260px, 0.7fr) minmax(0, 1.3fr);
  gap: clamp(28px, 5vw, 64px);
}

.timeline {
  display: grid;
  gap: 14px;
}

.timeline article {
  padding: 24px;
  border-radius: 8px;
}

.contact-section {
  display: grid;
  grid-template-columns: minmax(260px, 0.82fr) minmax(280px, 0.48fr);
  gap: clamp(24px, 5vw, 56px);
  align-items: center;
  border-top: 1px solid var(--line);
}

.contact-copy {
  max-width: 720px;
}

.contact-card {
  padding: clamp(26px, 4vw, 38px);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(217, 255, 232, 0.92), rgba(167, 247, 199, 0.76)),
    var(--green-050);
}

.contact-card span {
  display: inline-block;
  margin-bottom: 16px;
  color: var(--green-700);
  font-size: 14px;
  font-weight: 900;
  letter-spacing: 0.12em;
}

.contact-card strong {
  display: block;
  margin-bottom: 14px;
  color: var(--green-900);
  font-size: clamp(42px, 6vw, 72px);
  line-height: 1;
}

.contact-card p {
  margin-bottom: 0;
}

.sources {
  margin-bottom: 56px;
  padding: 28px;
  border-radius: 8px;
}

.sources h2 {
  font-size: 28px;
}

.source-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.source-links a {
  padding: 9px 12px;
  border: 1px solid var(--green-400);
  border-radius: 999px;
  color: var(--green-800);
  background: var(--green-100);
  font-weight: 800;
}

@media (max-width: 880px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero,
  .split,
  .future,
  .contact-section {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding-top: 44px;
  }

  .insight-grid,
  .risk-board {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 540px) {
  main {
    width: min(100% - 24px, 1180px);
  }

  nav a {
    padding: 7px 9px;
  }

  .section {
    padding: 58px 0;
  }

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

  .hero-actions,
  .button {
    width: 100%;
  }
}