:root {
  --bg: #f4efe4;
  --surface: #fffaf0;
  --ink: #1e2a2f;
  --accent: #165d5d;
  --accent-2: #c96c2d;
  --line: #d8c9b0;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 20% 10%, rgba(201, 108, 45, 0.18) 0, rgba(201, 108, 45, 0) 40%),
    radial-gradient(circle at 80% 0%, rgba(22, 93, 93, 0.2) 0, rgba(22, 93, 93, 0) 35%),
    var(--bg);
  font-family: "Noto Serif SC", "Source Han Serif SC", serif;
  line-height: 1.7;
}

.container {
  width: min(1080px, 92%);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  backdrop-filter: blur(8px);
  background: rgba(255, 250, 240, 0.86);
  border-bottom: 1px solid var(--line);
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 0;
}

.brand {
  font-weight: 700;
  letter-spacing: 0.08em;
}

nav a {
  color: var(--ink);
  text-decoration: none;
  margin-left: 18px;
  border-bottom: 2px solid transparent;
}

nav a:hover,
nav a[aria-current="page"] {
  border-bottom-color: var(--accent-2);
}

.hero {
  padding: 68px 0 32px;
}

.hero-tag {
  display: inline-block;
  margin: 0;
  padding: 4px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13px;
  background: var(--surface);
}

.hero h1 {
  margin: 14px 0 0;
  font-size: clamp(34px, 6vw, 62px);
  line-height: 1.1;
}

.hero-sub {
  max-width: 760px;
  margin-top: 10px;
  font-size: 18px;
}

.cards {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 20px auto 34px;
}

.card,
.notice,
.page {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: 0 10px 30px rgba(23, 31, 34, 0.06);
}

.card {
  padding: 20px;
  animation: rise 600ms ease both;
}

.card h2 {
  margin-top: 0;
  color: var(--accent);
}

.notice {
  padding: 22px;
  margin-bottom: 44px;
}

.page {
  margin-top: 32px;
  margin-bottom: 42px;
  padding: 24px;
}

.page h1 {
  margin-top: 0;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: rgba(255, 250, 240, 0.82);
  padding: 22px 0;
  font-size: 14px;
}

@keyframes rise {
  from {
    transform: translateY(16px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

@media (max-width: 860px) {
  .cards {
    grid-template-columns: 1fr;
  }

  .nav {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  nav a {
    margin-left: 0;
    margin-right: 16px;
  }
}