/* ================================================
   縁むすび便り — 深夜の聖域UI
   テーマ: 紫・深夜・月・明朝体 × モダン
   ================================================ */

/* ── CSS Variables ───────────────────────────── */
:root {
  /* カラーパレット */
  --color-bg:        #0d0b14;   /* 深夜の空 */
  --color-bg-card:   #16122a;   /* カード背景 */
  --color-bg-nav:    #0d0b14e8; /* ナビ半透明 */
  --color-primary:   #c39bd3;   /* 柔らかい紫 */
  --color-accent:    #f0c27f;   /* ゴールドアクセント */
  --color-text:      #e8e0f0;   /* 月光白 */
  --color-text-muted:#9d90b5;   /* 薄紫グレー */
  --color-border:    #2e2550;   /* 仕切り線 */
  --color-cta-line:  #06c755;   /* LINE グリーン */
  --color-cta-line-h:#04a744;

  /* タイポグラフィ */
  --font-serif:  'Noto Serif JP', 'ヒラギノ明朝 Pro', serif;
  --font-sans:   'Noto Sans JP', sans-serif;

  /* スペーシング */
  --max-width: 720px;
  --gap: 1.5rem;
}

/* ── Reset & Base ────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  line-height: 1.8;
  min-height: 100vh;
}

/* 星空の背景パターン（擬似要素） */
body::before {
  content: '';
  position: fixed; inset: 0; z-index: 0;
  background-image: radial-gradient(1px 1px at 20% 30%, rgba(195,155,211,0.4) 0%, transparent 100%),
                    radial-gradient(1px 1px at 60% 70%, rgba(240,194,127,0.3) 0%, transparent 100%),
                    radial-gradient(1px 1px at 80% 20%, rgba(195,155,211,0.3) 0%, transparent 100%),
                    radial-gradient(1px 1px at 40% 80%, rgba(240,194,127,0.2) 0%, transparent 100%);
  pointer-events: none;
}

a { color: var(--color-primary); text-decoration: none; transition: opacity .2s; }
a:hover { opacity: .75; }
img { max-width: 100%; height: auto; display: block; }

/* ── Navigation ─────────────────────────────── */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: var(--color-bg-nav);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}
.nav__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: .8rem 1.5rem;
  display: flex; align-items: center; gap: 1rem;
}
.nav__logo {
  display: flex; align-items: center; gap: .4rem;
  font-family: var(--font-serif);
  font-size: 1.1rem;
  color: var(--color-text);
  font-weight: 400;
  margin-right: auto;
}
.nav__logo-moon { font-size: 1.2rem; }
.nav__links {
  display: flex; align-items: center; gap: 1.2rem;
  list-style: none;
}
.nav__link {
  font-size: .875rem;
  color: var(--color-text-muted);
}
.nav__cta {
  background: linear-gradient(135deg, var(--color-primary), #8e6cc0);
  color: #fff !important;
  padding: .4rem 1rem;
  border-radius: 999px;
  font-size: .8rem;
  font-weight: 500;
  white-space: nowrap;
  transition: transform .2s, box-shadow .2s;
}
.nav__cta:hover { transform: translateY(-1px);  box-shadow: 0 4px 12px rgba(195,155,211,.4); opacity: 1; }
.nav__toggle { display: none; background: none; border: none; color: var(--color-text); font-size: 1.4rem; cursor: pointer; }

@media (max-width: 600px) {
  .nav__toggle { display: block; }
  .nav__links {
    display: none; flex-direction: column; align-items: flex-start;
    position: absolute; top: 100%; left: 0; right: 0;
    background: var(--color-bg); padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--color-border);
    gap: .8rem;
  }
  .nav__links.is-open { display: flex; }
}

/* ── Main ────────────────────────────────────── */
.main { position: relative; z-index: 1; }

/* ── Hero ────────────────────────────────────── */
.hero {
  text-align: center;
  padding: 4rem 1.5rem 3rem;
  max-width: var(--max-width);
  margin: 0 auto;
}
.hero__moon { font-size: 3rem; margin-bottom: 1rem; display: block; animation: float 4s ease-in-out infinite; }
@keyframes float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-8px); } }
.hero__title {
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 5vw, 2.4rem);
  font-weight: 300;
  line-height: 1.5;
  color: var(--color-text);
  margin-bottom: 1rem;
}
.hero__title em {
  font-style: normal;
  color: var(--color-primary);
}
.hero__lead {
  font-size: .95rem;
  color: var(--color-text-muted);
  line-height: 1.9;
  margin-bottom: 2rem;
}
.hero__cta-group { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: .4rem;
  padding: .75rem 1.75rem;
  border-radius: 999px;
  font-size: .9rem;
  font-weight: 500;
  cursor: pointer;
  transition: transform .2s, box-shadow .2s;
  border: none;
}
.btn:hover { transform: translateY(-2px); opacity: 1; }
.btn--primary {
  background: linear-gradient(135deg, var(--color-cta-line), var(--color-cta-line-h));
  color: #fff;
  box-shadow: 0 4px 16px rgba(6,199,85,.35);
}
.btn--primary:hover { box-shadow: 0 6px 20px rgba(6,199,85,.5); }
.btn--ghost {
  background: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}

/* ── Section ─────────────────────────────────── */
.section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2.5rem 1.5rem;
}
.section__title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--color-accent);
  margin-bottom: 1.5rem;
  display: flex; align-items: center; gap: .5rem;
}
.section__title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: linear-gradient(to right, var(--color-border), transparent);
}

/* ── Card ────────────────────────────────────── */
.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 1.5rem;
  transition: transform .2s, border-color .2s;
}
.card:hover { transform: translateY(-3px); border-color: var(--color-primary); }
.card__label {
  font-size: .75rem;
  color: var(--color-primary);
  letter-spacing: .05em;
  margin-bottom: .4rem;
}
.card__title {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 400;
  line-height: 1.6;
  color: var(--color-text);
  margin-bottom: .6rem;
}
.card__excerpt { font-size: .85rem; color: var(--color-text-muted); }

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}

/* ── Article Body ────────────────────────────── */
.article {
  max-width: var(--max-width);
  margin: 2rem auto;
  padding: 0 1.5rem 4rem;
}
.article__header { margin-bottom: 2rem; }
.article__label {
  font-size: .75rem;
  color: var(--color-primary);
  letter-spacing: .1em;
  margin-bottom: .5rem;
}
.article__title {
  font-family: var(--font-serif);
  font-size: clamp(1.4rem, 4vw, 2rem);
  font-weight: 400;
  line-height: 1.5;
  color: var(--color-text);
  margin-bottom: .75rem;
}
.article__date { font-size: .8rem; color: var(--color-text-muted); }
.article__body {
  font-size: 1rem;
  line-height: 2;
  color: var(--color-text);
}
.article__body h2 {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 400;
  color: var(--color-primary);
  margin: 2.5rem 0 1rem;
  padding-bottom: .5rem;
  border-bottom: 1px solid var(--color-border);
}
.article__body h3 {
  font-size: 1.05rem;
  color: var(--color-accent);
  margin: 1.8rem 0 .7rem;
}
.article__body p { margin-bottom: 1.2rem; }
.article__body strong { color: var(--color-primary); font-weight: 500; }
.article__body blockquote {
  border-left: 3px solid var(--color-primary);
  padding: .8rem 1.2rem;
  margin: 1.5rem 0;
  background: var(--color-bg-card);
  border-radius: 0 8px 8px 0;
  color: var(--color-text-muted);
  font-style: italic;
}

/* ── LINE誘導ブロック（記事内CTA） ─────────── */
.cta-box {
  background: linear-gradient(135deg, #0e2a1a, #1a3d26);
  border: 1px solid rgba(6,199,85,.3);
  border-radius: 12px;
  padding: 1.5rem;
  text-align: center;
  margin: 2.5rem 0;
}
.cta-box__title {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  color: var(--color-text);
  margin-bottom: .5rem;
}
.cta-box__lead { font-size: .85rem; color: var(--color-text-muted); margin-bottom: 1rem; }

/* ── LINE フローティング ─────────────────────── */
.line-float {
  position: fixed;
  bottom: 1.5rem; left: 50%;
  transform: translateX(-50%);
  z-index: 200;
  width: min(90vw, 400px);
  animation: slideUp .5s ease .8s both;
}
@keyframes slideUp { from { opacity:0; transform: translateX(-50%) translateY(20px); } to { opacity:1; transform: translateX(-50%) translateY(0); } }
.line-float__link {
  display: flex; align-items: center; gap: .8rem;
  background: linear-gradient(135deg, var(--color-cta-line), var(--color-cta-line-h));
  color: #fff !important;
  padding: 1rem 1.5rem;
  border-radius: 999px;
  box-shadow: 0 8px 24px rgba(6,199,85,.45);
  transition: transform .2s, box-shadow .2s;
}
.line-float__link:hover { transform: translateY(-2px); box-shadow: 0 12px 28px rgba(6,199,85,.6); }
.line-float__icon { font-size: 1.3rem; }
.line-float__text { font-size: .9rem; font-weight: 500; flex: 1; }
.line-float__arrow { font-size: 1rem; opacity: .7; }

/* ── Footer ─────────────────────────────────── */
.footer {
  border-top: 1px solid var(--color-border);
  padding: 3rem 1.5rem 5rem; /* 下部はフローティングCTA分の余白 */
  background: #09070f;
}
.footer__inner { max-width: var(--max-width); margin: 0 auto; }
.footer__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}
.footer__heading { font-size: .8rem; color: var(--color-accent); letter-spacing: .08em; margin-bottom: .8rem; }
.footer__links { list-style: none; }
.footer__links li { margin-bottom: .4rem; }
.footer__link { font-size: .85rem; color: var(--color-text-muted); }
.footer__brand-desc { font-size: .8rem; color: var(--color-text-muted); margin-top: .5rem; line-height: 1.7; }
.footer__bottom { border-top: 1px solid var(--color-border); padding-top: 1.5rem; }
.footer__disclaimer { font-size: .75rem; color: var(--color-text-muted); margin-bottom: .5rem; }
.footer__copy { font-size: .75rem; color: var(--color-text-muted); }

/* ── Utilities ──────────────────────────────── */
.divider { height: 1px; background: linear-gradient(to right, transparent, var(--color-border), transparent); margin: 2rem 0; }
.text-center { text-align: center; }
.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }