:root {
  --ink: #071a27;
  --deep: #0b2d3b;
  --sea: #0d5260;
  --foam: #eef6f2;
  --sand: #e9c98b;
  --coral: #ee8062;
  --muted: #70858a;
  --line: rgba(7, 26, 39, 0.14);
  --serif: "Noto Serif SC", serif;
  --mono: "DM Mono", monospace;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  color: var(--ink);
  background: var(--foam);
  font-family: var(--serif);
  line-height: 1.7;
}
a {
  color: inherit;
  text-decoration: none;
}
.top {
  height: 40px;
  background: var(--ink);
  color: #c9ded7;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 5vw;
  font: 11px var(--mono);
  letter-spacing: 0.08em;
}
.top span {
  color: var(--sand);
}
header {
  position: sticky;
  top: 0;
  z-index: 5;
  background: rgba(238, 246, 242, 0.9);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 17px 5vw;
}
.brand {
  font-weight: 900;
  font-size: 1.15rem;
  letter-spacing: 0.16em;
}
.brand small {
  display: block;
  font: 10px var(--mono);
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--sea);
  margin-top: -3px;
}
nav {
  display: flex;
  gap: 25px;
  font-size: 0.86rem;
}
nav a.active, nav a.current {
  color: var(--coral);
}
.cta {
  background: var(--ink);
  color: #fff;
  padding: 9px 16px;
  border-radius: 99px;
  font-size: 0.8rem;
}
.intro {
  padding: 110px 5vw 70px;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 8vw;
  align-items: end;
  background: radial-gradient(
    circle at 85% 0,
    rgba(233, 201, 139, 0.4),
    transparent 34%
  );
}
.eyebrow {
  font: 11px var(--mono);
  letter-spacing: 0.12em;
  color: var(--coral);
}
h1 {
  font-size: clamp(3rem, 7vw, 6.2rem);
  line-height: 1.06;
  letter-spacing: -0.08em;
  margin: 16px 0;
}
h1 em {
  font-style: normal;
  color: var(--sea);
}
.intro-copy {
  max-width: 430px;
  color: #46646a;
  margin: 0 0 10px;
}
.filters {
  padding: 0 5vw 34px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  border-bottom: 1px solid var(--line);
}
.filters a {
  padding: 8px 15px;
  border: 1px solid var(--line);
  border-radius: 99px;
  font-size: 0.82rem;
}
.filters .selected {
  background: var(--ink);
  color: #fff;
  border-color: var(--ink);
}
.articles {
  padding: 65px 5vw 110px;
}
.feature {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 400px;
  background: var(--deep);
  color: #fff;
}
.feature-img {
  background:
    linear-gradient(0deg, rgba(7, 26, 39, 0.34), rgba(7, 26, 39, 0.06)),
    url("assets/围堰平静海面.jpg") center/cover;
  min-height: 300px;
}
.feature-copy {
  padding: 45px;
  display: flex;
  flex-direction: column;
  justify-content: end;
}
.feature-copy > span,
.article-card > span {
  font: 11px var(--mono);
  color: var(--sand);
  letter-spacing: 0.08em;
}
.feature-copy h2 {
  font-size: clamp(1.8rem, 3vw, 3.2rem);
  line-height: 1.2;
  letter-spacing: -0.06em;
  margin: 14px 0;
}
.feature-copy p {
  color: #c9ddd8;
  max-width: 500px;
}
.feature-copy a {
  color: var(--sand);
  font-size: 0.84rem;
}
.article-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 30px;
}
.article-card {
  position: relative;
  display: block;
  padding: 28px 35px 30px 0;
  border-bottom: 1px solid var(--line);
}
.article-card h3 {
  font-size: 1.3rem;
  line-height: 1.3;
  margin: 8px 0;
}
.article-card p {
  color: var(--muted);
  font-size: 0.9rem;
  margin: 0;
  max-width: 450px;
}
.article-card b {
  position: absolute;
  right: 5px;
  bottom: 30px;
  color: var(--coral);
  font: 18px var(--mono);
}
.article {
  max-width: 980px;
  margin: 0 auto;
  padding: 75px 5vw 120px;
}
.back {
  font: 12px var(--mono);
  color: var(--sea);
}
.article > h1 {
  font-size: clamp(2.5rem, 6vw, 5.4rem);
  max-width: 950px;
}
.dek {
  font-size: 1.15rem;
  color: #46646a;
  max-width: 740px;
  border-left: 3px solid var(--coral);
  padding-left: 18px;
}
.article-body {
  max-width: 760px;
  margin: 60px auto 0;
}
.article-body h2 {
  font-size: 1.8rem;
  line-height: 1.3;
  margin: 52px 0 15px;
}
.article-body p,
.article-body li {
  font-size: 1rem;
  color: #365761;
}
.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
}
.article-body th,
.article-body td {
  padding: 13px 14px;
  border: 1px solid var(--line);
  text-align: left;
  font-size: 0.9rem;
}
.article-body th {
  background: #dcece6;
}
.note {
  background: #f5e7c3;
  padding: 20px 22px;
  margin: 28px 0;
  color: #42585d;
}
.note b {
  color: var(--coral);
}
.source {
  font-size: 0.78rem !important;
  color: var(--muted) !important;
  border-top: 1px solid var(--line);
  padding-top: 20px;
  margin-top: 52px;
}
footer {
  padding: 25px 5vw;
  background: var(--ink);
  color: #9fb8b2;
  display: flex;
  justify-content: space-between;
  font: 11px var(--mono);
  letter-spacing: 0.05em;
}
@media (max-width: 800px) {
  nav {
    display: none;
  }
  .intro {
    grid-template-columns: 1fr;
    padding-top: 70px;
  }
  .feature {
    grid-template-columns: 1fr;
  }
  .feature-img {
    min-height: 230px;
  }
  .feature-copy {
    padding: 30px;
  }
  .article-grid {
    grid-template-columns: 1fr;
  }
  .article {
    padding-top: 50px;
  }
  footer {
    display: block;
    line-height: 2;
  }
}