/* ユランシアの書入門サイト — 共通スタイル（ブライト・ネイビーテーマ） */

:root {
  --color-bg: #ffffff;
  --color-bg-soft: #f7f4ec;
  --color-navy: #0b1d3a;
  --color-navy-soft: #1b2a4a;
  --color-ink: #1b2a4a;
  --color-ink-soft: #445068;
  --color-accent: #c9a227;
  --color-accent-light: #e4c563;
  --color-line: #e4e0d5;
  --font-serif: "Yu Mincho", "Hiragino Mincho ProN", "Noto Serif JP", serif;
  --font-sans: "Hiragino Sans", "Yu Gothic", "Noto Sans JP", sans-serif;
}

* { box-sizing: border-box; }

html { background: var(--color-bg); }

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-ink-soft);
  font-family: var(--font-sans);
  line-height: 1.9;
  font-size: 16px;
  position: relative;
}

header.site-header {
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--color-line);
  color: var(--color-ink);
  padding: 1.2rem 2rem;
  position: sticky;
  top: 0;
  z-index: 10;
}

.site-header .inner {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.site-title {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  letter-spacing: 0.05em;
  color: var(--color-navy);
  text-decoration: none;
}

nav.main-nav a {
  color: var(--color-ink-soft);
  text-decoration: none;
  margin-left: 1.5rem;
  font-size: 0.95rem;
  transition: color 0.2s ease;
}

nav.main-nav a:hover,
nav.main-nav a[aria-current="page"] {
  color: var(--color-accent);
  border-bottom: 1px solid var(--color-accent);
}

main {
  overflow-x: hidden;
  max-width: 800px;
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
  position: relative;
  z-index: 1;
}

.hero {
  text-align: center;
  padding: 6rem 1.5rem 5rem;
  margin: 0 calc(50% - 50vw) 3rem;
  width: 100vw;
  max-width: 100vw;
  background-color: var(--color-navy);
  background-size: cover;
  background-position: center;
  position: relative;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(11,29,58,0.55) 0%, rgba(11,29,58,0.72) 55%, rgba(11,29,58,0.92) 100%);
}

.hero > * {
  position: relative;
  z-index: 1;
}

.hero.hero-cover   { background-image: url("/images/urantia-cover.jpg"); background-position: center 30%; }
.hero.hero-carina  { background-image: url("https://images-assets.nasa.gov/image/carina_nebula/carina_nebula~large.jpg"); }
.hero.hero-eagle   { background-image: url("https://images-assets.nasa.gov/image/PIA24577/PIA24577~large.jpg"); }
.hero.hero-deepfield { background-image: url("https://images-assets.nasa.gov/image/GSFC_20171208_Archive_e001651/GSFC_20171208_Archive_e001651~large.jpg"); }
.hero.hero-map { background: linear-gradient(135deg, var(--color-navy), var(--color-navy-soft)); }

.hero h1 {
  font-family: var(--font-serif);
  font-size: 2.3rem;
  margin-bottom: 0.6rem;
  color: #fff;
  text-shadow: 0 2px 18px rgba(0,0,0,0.35);
}

.hero p.lead {
  font-size: 1.15rem;
  color: #dfe7f7;
  max-width: 32rem;
  margin: 0 auto;
}

.page-title {
  font-family: var(--font-serif);
  font-size: 1.8rem;
  color: var(--color-navy);
  text-align: center;
  padding: 3rem 0 1rem;
}

h1, h2, h3 {
  font-family: var(--font-serif);
  color: var(--color-navy);
}

h2 {
  font-size: 1.5rem;
  margin-top: 2.8rem;
  border-left: 4px solid var(--color-accent);
  padding-left: 0.7rem;
}

a { color: var(--color-navy); }
a:hover { color: var(--color-accent); }

.cta-box {
  background: var(--color-bg-soft);
  border: 1px solid var(--color-line);
  border-left: 4px solid var(--color-accent);
  border-radius: 10px;
  padding: 1.8rem;
  margin: 2.5rem 0;
  text-align: center;
  box-shadow: 0 4px 24px rgba(11,29,58,0.06);
}

.cta-box a.button {
  display: inline-block;
  margin-top: 0.9rem;
  background: linear-gradient(135deg, var(--color-accent), #b8863f);
  color: #ffffff;
  font-weight: 600;
  text-decoration: none;
  padding: 0.8rem 1.8rem;
  border-radius: 999px;
  font-size: 0.95rem;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.cta-box a.button:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 18px rgba(201,162,39,0.35);
}

footer.site-footer {
  text-align: center;
  padding: 2.5rem 1.5rem;
  color: #8b93a8;
  font-size: 0.85rem;
  border-top: 1px solid var(--color-line);
  position: relative;
  z-index: 1;
}

.notice {
  background: var(--color-bg-soft);
  border: 1px solid rgba(201, 162, 39, 0.35);
  color: var(--color-ink-soft);
  padding: 1.1rem 1.3rem;
  border-radius: 6px;
  font-size: 0.9rem;
  margin: 2.2rem 0;
}

.credit {
  font-size: 0.85rem;
  color: #8b93a8;
  margin-top: 3rem;
}

main p a { text-decoration: underline; text-underline-offset: 2px; }

.cover-hero {
  max-width: 560px;
  margin: 2.5rem auto 0;
  overflow: hidden;
  border-radius: 10px;
  background: var(--color-navy);
  box-shadow: 0 12px 32px rgba(11,29,58,0.25);
}

.cover-hero img {
  display: block;
  width: 100%;
  height: auto;
}

.cover-hero-text {
  text-align: center;
  padding: 2.4rem 1.5rem 0.5rem;
}

.cover-hero-text h1 {
  font-family: var(--font-serif);
  font-size: 2.1rem;
  color: var(--color-navy);
  margin: 0 0 0.6rem;
}

.cover-hero-text p.lead {
  font-size: 1.1rem;
  color: var(--color-ink-soft);
  max-width: 32rem;
  margin: 0 auto;
}

.content-figure {
  margin: 2.2rem 0;
  text-align: center;
}

.content-figure img {
  max-width: 480px;
  width: 100%;
  height: auto;
  border-radius: 8px;
  box-shadow: 0 8px 24px rgba(11,29,58,0.15);
}

.content-figure figcaption {
  font-size: 0.85rem;
  color: var(--color-ink-soft);
  margin-top: 0.7rem;
}

.concept-box {
  background: #fff;
  border-left: 3px solid var(--color-accent);
  padding: 1.2rem 1.5rem;
  border-radius: 4px;
  margin: 2.2rem 0;
  box-shadow: 0 2px 10px rgba(11,29,58,0.06);
}

.concept-box strong {
  display: block;
  font-family: var(--font-serif);
  color: var(--color-navy);
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
}

.concept-box p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--color-ink-soft);
}

.book-cover-frame {
  text-align: center;
  margin: 2rem 0 2.5rem;
}

.book-cover-frame img {
  max-width: 220px;
  width: 100%;
  height: auto;
  border-radius: 6px;
  box-shadow: 0 12px 32px rgba(11,29,58,0.25);
}

.book-cover-caption {
  font-size: 0.82rem;
  color: var(--color-ink-soft);
  margin: 0.7rem 0 0;
}

.members-banner {
  background: linear-gradient(135deg, rgba(11,29,58,0.06), rgba(201,162,39,0.10));
  border: 1px solid var(--color-line);
  border-radius: 8px;
  padding: 1.2rem 1.5rem;
  margin: 2rem 0;
  font-size: 0.92rem;
  color: var(--color-ink-soft);
}

@media (min-width: 1200px) {
  .site-header .inner {
    max-width: 1400px;
  }

  main {
    max-width: 960px;
  }

  .hero p.lead {
    max-width: 38rem;
  }
}

@media (max-width: 640px) {
  .site-header { padding: 1rem 1.2rem; }

  .site-header .inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.6rem;
  }

  nav.main-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 0.3rem 1rem;
  }

  nav.main-nav a {
    margin-left: 0;
    font-size: 0.9rem;
  }

  .hero {
    padding: 3.5rem 1.2rem 3rem;
  }

  .hero h1 {
    font-size: 1.6rem;
  }

  .hero p.lead {
    font-size: 1rem;
  }

  .page-title {
    font-size: 1.4rem;
    padding: 2rem 0 0.8rem;
  }

  main {
    padding: 0 1.2rem 3rem;
  }

  h2 {
    font-size: 1.25rem;
  }

  .cta-box {
    padding: 1.3rem;
  }

  .book-cover-frame img {
    max-width: 160px;
  }

  .cover-hero {
    max-width: 100%;
    margin-top: 1.5rem;
    border-radius: 6px;
  }

  .cover-hero-text {
    padding: 1.6rem 1.2rem 0.3rem;
  }

  .cover-hero-text h1 {
    font-size: 1.5rem;
  }

  .cover-hero-text p.lead {
    font-size: 0.98rem;
  }
}