:root {
  --bg: #071a2f;
  --bg-deep: #04111f;
  --surface: #ffffff;
  --surface-soft: #f5f8fd;
  --text: #0d1b2f;
  --text-soft: #536276;
  --muted: rgba(255, 255, 255, 0.72);
  --line: rgba(16, 42, 76, 0.12);
  --blue: #1769ff;
  --cyan: #28d7c5;
  --shadow: 0 24px 70px rgba(5, 19, 37, 0.16);
  --radius-lg: 28px;
  --radius-md: 20px;
  --radius-sm: 14px;
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  color: var(--text);
  background: var(--bg);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  margin: 0;
  background: #f6f9fd;
}

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

svg {
  display: block;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  width: min(1180px, calc(100% - 40px));
  margin: 18px auto 0;
  padding: 12px 14px 12px 18px;
  color: var(--text);
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 999px;
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 750;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.brand-mark {
  display: grid;
  width: 36px;
  height: 36px;
  place-items: center;
  color: #fff;
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  border-radius: 12px;
  box-shadow: 0 10px 28px rgba(23, 105, 255, 0.34);
}

.brand-mark svg {
  width: 24px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.home-button,
.home-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 999px;
  font-weight: 760;
}

.home-button {
  min-height: 42px;
  padding: 0 18px;
  color: #fff;
  background: #071a2f;
}

.home-button svg {
  width: 17px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2.2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.hero {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: 76px 0 52px;
  color: var(--text);
}

.hero h1 {
  max-width: 850px;
  margin: 0;
  font-size: clamp(42px, 6vw, 76px);
  line-height: 1.02;
  letter-spacing: -0.06em;
}

.hero p {
  max-width: 760px;
  margin: 24px 0 0;
  color: var(--text-soft);
  font-size: clamp(17px, 1.55vw, 21px);
  line-height: 1.75;
}

.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 30px;
}

.meta-row span {
  padding: 10px 14px;
  color: var(--text);
  font-size: 13px;
  font-weight: 720;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 999px;
  backdrop-filter: blur(12px);
}

.page-shell {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 28px;
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto 78px;
  align-items: start;
}

.side-card {
  position: sticky;
  top: 104px;
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: 0 18px 45px rgba(20, 44, 80, 0.08);
}

.side-card h2 {
  margin: 0 0 16px;
  font-size: 20px;
  letter-spacing: -0.03em;
}

.side-card nav {
  display: grid;
  gap: 4px;
}

.side-card nav a {
  padding: 10px 12px;
  color: var(--text-soft);
  font-size: 14px;
  line-height: 1.35;
  border-radius: 12px;
}

.side-card nav a:hover {
  color: var(--text);
  background: var(--surface-soft);
}

.legal-card {
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.notice {
  padding: 26px 34px;
  color: #fff;
  background:
    radial-gradient(circle at 88% 20%, rgba(40, 215, 197, 0.18), transparent 28%),
    linear-gradient(135deg, #071a2f, #082a4d);
}

.notice strong {
  display: block;
  margin-bottom: 8px;
  font-size: 18px;
}

.notice p {
  margin: 0;
  color: var(--muted);
  line-height: 1.75;
}

.article-body {
  padding: 42px;
}

.article-body section {
  scroll-margin-top: 120px;
}

.article-body section + section {
  margin-top: 42px;
  padding-top: 38px;
  border-top: 1px solid var(--line);
}

.article-body h2 {
  margin: 0 0 18px;
  font-size: clamp(25px, 2.7vw, 34px);
  line-height: 1.2;
  letter-spacing: -0.04em;
}

.article-body h3 {
  margin: 24px 0 10px;
  font-size: 20px;
  letter-spacing: -0.02em;
}

.article-body p,
.article-body li {
  color: var(--text-soft);
  font-size: 16px;
  line-height: 1.88;
}

.article-body p {
  margin: 0 0 14px;
}

.article-body ul,
.article-body ol {
  display: grid;
  gap: 10px;
  margin: 12px 0 0;
  padding-left: 22px;
}

.article-body strong {
  color: var(--text);
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin: 18px 0 6px;
  padding: 0;
  list-style: none;
}

.info-grid li {
  padding: 18px;
  color: var(--text-soft);
  background: var(--surface-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
}

.contact-box {
  padding: 22px;
  background: linear-gradient(135deg, #f4f8ff, #ffffff);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: 28px 0 42px;
  color: var(--text-soft);
}

@media (max-width: 920px) {
  .page-shell {
    grid-template-columns: 1fr;
  }

  .side-card {
    position: static;
  }

  .side-card nav {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .site-header,
  .hero,
  .page-shell,
  .site-footer {
    width: min(100% - 28px, 1180px);
  }

  .site-header {
    align-items: flex-start;
    flex-direction: column;
    border-radius: 26px;
  }

  .home-button {
    width: 100%;
  }

  .hero {
    padding: 56px 0 36px;
  }

  .article-body,
  .notice {
    padding: 26px;
  }

  .info-grid,
  .side-card nav {
    grid-template-columns: 1fr;
  }

  .site-footer {
    align-items: flex-start;
    flex-direction: column;
    gap: 12px;
  }
}