:root {
  --bg: #f3f6f8;
  --bg-soft: #e8eef2;
  --ink: #1a2a33;
  --muted: #5c6b75;
  --line: rgba(26, 42, 51, 0.1);
  --brand: #1f6f78;
  --brand-deep: #14555c;
  --accent: #c9783a;
  --panel: #ffffff;
  --shadow: 0 18px 48px rgba(26, 42, 51, 0.08);
  --radius: 18px;
  --font-display: "Source Han Serif SC", "Noto Serif SC", "Songti SC", "SimSun", serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.7;
  background:
    radial-gradient(ellipse 80% 50% at 10% -10%, rgba(31, 111, 120, 0.12), transparent 55%),
    radial-gradient(ellipse 60% 40% at 100% 0%, rgba(201, 120, 58, 0.08), transparent 50%),
    linear-gradient(180deg, #f7fafb 0%, var(--bg) 45%, #eef3f5 100%);
}

a {
  color: var(--brand-deep);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

img {
  max-width: 100%;
  display: block;
}

.wrap {
  width: min(1080px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(12px);
  background: rgba(247, 250, 251, 0.86);
  border-bottom: 1px solid var(--line);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 16px 0;
}

.logo {
  display: flex;
  align-items: baseline;
  gap: 10px;
  color: inherit;
  text-decoration: none;
}

.logo-mark {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--brand-deep);
}

.logo-sub {
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.18em;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  font-size: 14px;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--brand-deep);
}

.hero {
  padding: 72px 0 56px;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 40px;
  align-items: center;
}

.hero-copy h1 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: 0.02em;
}

.hero-copy p {
  margin: 0 0 28px;
  max-width: 34em;
  color: var(--muted);
  font-size: 17px;
}

.hero-site-name {
  margin: -8px 0 16px !important;
  font-size: 15px !important;
  letter-spacing: 0.12em;
  color: var(--brand-deep) !important;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 22px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 15px;
  text-decoration: none;
  transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--brand);
  color: #fff;
}

.btn-primary:hover {
  background: var(--brand-deep);
  color: #fff;
}

.btn-ghost {
  background: transparent;
  border-color: rgba(31, 111, 120, 0.35);
  color: var(--brand-deep);
}

.hero-visual {
  position: relative;
  min-height: 320px;
  border-radius: 28px;
  overflow: hidden;
  background:
    linear-gradient(145deg, rgba(31, 111, 120, 0.92), rgba(20, 85, 92, 0.88)),
    radial-gradient(circle at 70% 20%, rgba(255, 255, 255, 0.22), transparent 40%);
  box-shadow: var(--shadow);
}

.hero-visual::after {
  content: "";
  position: absolute;
  inset: auto -20% -30% 20%;
  height: 70%;
  background: radial-gradient(circle, rgba(201, 120, 58, 0.35), transparent 65%);
}

.feed-mock {
  position: relative;
  z-index: 1;
  margin: 28px;
  padding: 18px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.22);
  color: #f4fbfb;
  backdrop-filter: blur(8px);
}

.feed-item {
  margin-bottom: 12px;
  padding: 12px 14px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.14);
}

.feed-tag {
  display: inline-block;
  margin-bottom: 6px;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 11px;
  letter-spacing: 0.08em;
  background: rgba(255, 255, 255, 0.18);
}

.feed-title {
  font-size: 14px;
  font-weight: 600;
  line-height: 1.45;
}

.feed-meta {
  margin-top: 6px;
  font-size: 12px;
  opacity: 0.75;
}

.feed-mock .meta {
  margin-top: 14px;
  font-size: 12px;
  opacity: 0.75;
  letter-spacing: 0.08em;
  text-align: center;
}

section {
  padding: 28px 0 56px;
}

.section-head {
  margin-bottom: 24px;
}

.section-head h2 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 30px;
  letter-spacing: 0.04em;
}

.section-head p {
  margin: 0;
  color: var(--muted);
  max-width: 40em;
}

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

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 20px;
  box-shadow: 0 10px 28px rgba(26, 42, 51, 0.04);
}

.card h3 {
  margin: 0 0 10px;
  font-size: 18px;
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 28px 26px;
  box-shadow: var(--shadow);
}

.panel h2,
.panel h3 {
  font-family: var(--font-display);
}

.panel p,
.panel li {
  color: var(--muted);
}

.panel ul {
  padding-left: 1.2em;
}

.info-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.info-table th,
.info-table td {
  padding: 14px 12px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.info-table th {
  width: 28%;
  color: var(--ink);
  font-weight: 600;
}

.info-table td {
  color: var(--muted);
}

.placeholder {
  color: #a05a1f;
  background: rgba(201, 120, 58, 0.1);
  padding: 2px 8px;
  border-radius: 6px;
  font-size: 13px;
}

.legal {
  max-width: 820px;
}

.legal h1 {
  margin-top: 0;
  font-family: var(--font-display);
  font-size: 34px;
}

.legal h2 {
  margin-top: 28px;
  font-size: 20px;
}

.legal p,
.legal li {
  color: var(--muted);
}

.site-footer {
  margin-top: 20px;
  padding: 36px 0 48px;
  border-top: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.55);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 24px;
}

.footer-grid h4 {
  margin: 0 0 12px;
  font-size: 14px;
  letter-spacing: 0.12em;
}

.footer-grid p,
.footer-grid a {
  color: var(--muted);
  font-size: 13px;
}

.footer-grid a {
  display: block;
  margin-bottom: 8px;
  text-decoration: none;
}

.footer-bottom {
  margin-top: 28px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  justify-content: space-between;
}

.footer-bottom a {
  color: var(--muted);
}

@media (max-width: 900px) {
  .hero,
  .grid-3,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 48px;
  }

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