/* ==========================================================
   公益財団法人 幸島文化振興財団 - 共通スタイル
   Kohshima Culture Foundation - Common Stylesheet
   ========================================================== */

:root {
  --washi: #faf7f0;
  --kinari: #f1ebdd;
  --paper: #ffffff;
  --ink: #0e1a2b;
  --ink-soft: #1f2d44;
  --ink-mid: #4a5a76;
  --ink-muted: #8a96aa;
  --indigo: #1a3a5c;
  --indigo-bright: #2563a8;
  --cyan: #0891a8;
  --cyan-soft: #4eb5c7;
  --gold: #b08d57;
  --line: rgba(14, 26, 43, 0.12);
  --line-strong: rgba(14, 26, 43, 0.25);
  --grid: rgba(26, 58, 92, 0.05);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: 'Shippori Mincho', 'Noto Sans JP', serif;
  color: var(--ink);
  background: var(--washi);
  line-height: 1.8;
  overflow-x: hidden;
  position: relative;
}

/* グローバル背景グリッド（控えめ） */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 80px 80px;
  pointer-events: none;
  z-index: 1;
  opacity: 0.6;
}

/* ========== ヘッダー ========== */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 1.2rem 3rem;
  background: rgba(250, 247, 240, 0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo-wrap {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.logo-wrap a {
  display: flex;
  align-items: center;
  gap: 1rem;
  text-decoration: none;
  color: inherit;
}

.logo-mark {
  width: 30px;
  height: 30px;
  border: 1px solid var(--indigo);
  position: relative;
  transform: rotate(45deg);
  flex-shrink: 0;
}

.logo-mark::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 6px;
  height: 6px;
  background: var(--cyan);
  border-radius: 50%;
}

.logo {
  font-family: 'Shippori Mincho', serif;
  font-weight: 500;
  font-size: 1rem;
  letter-spacing: 0.15em;
  color: var(--ink);
}

.logo-sub {
  display: block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.65rem;
  letter-spacing: 0.25em;
  color: var(--cyan);
  margin-top: 0.2rem;
  font-weight: 400;
  text-transform: uppercase;
}

nav ul {
  display: flex;
  list-style: none;
  gap: 2.5rem;
}

nav a {
  text-decoration: none;
  color: var(--ink);
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 0.8rem;
  letter-spacing: 0.15em;
  font-weight: 400;
  position: relative;
  padding: 0.3rem 0;
  transition: color 0.3s;
}

nav a::before {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 1px;
  background: var(--indigo);
  transition: width 0.4s ease;
}

nav a:hover, nav a.active {
  color: var(--indigo);
}

nav a:hover::before, nav a.active::before {
  width: 100%;
}

/* ========== ページヘッダー（トップ以外の各ページ用）========== */
.page-header {
  padding: 10rem 3rem 5rem;
  position: relative;
  z-index: 2;
  background: var(--washi);
  border-bottom: 1px solid var(--line);
}

.page-header-inner {
  max-width: 1200px;
  margin: 0 auto;
}

.page-header .section-label {
  margin-bottom: 1.5rem;
}

.page-header h1 {
  font-family: 'Shippori Mincho', serif;
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 500;
  color: var(--ink);
  letter-spacing: 0.05em;
  line-height: 1.4;
}

.page-header .en {
  display: block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  font-weight: 400;
  letter-spacing: 0.4em;
  color: var(--ink-muted);
  margin-top: 1rem;
  text-transform: uppercase;
}

/* ========== セクション共通 ========== */
.section-label {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  letter-spacing: 0.3em;
  color: var(--cyan);
  margin-bottom: 1.5rem;
  text-transform: uppercase;
  font-weight: 500;
}

.section-label::before {
  content: '';
  width: 30px;
  height: 1px;
  background: var(--cyan);
}

.section-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.65rem;
  color: var(--gold);
  letter-spacing: 0.2em;
  margin-left: auto;
  font-weight: 500;
}

.content-section {
  padding: 6rem 3rem;
  position: relative;
  z-index: 2;
}

.content-inner {
  max-width: 1100px;
  margin: 0 auto;
}

.content-inner.narrow {
  max-width: 800px;
}

/* ========== フッター ========== */
footer {
  background: var(--ink);
  color: rgba(245, 241, 232, 0.7);
  padding: 5rem 3rem 2rem;
  position: relative;
  z-index: 2;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 4rem;
  margin-bottom: 4rem;
}

.footer-brand {
  font-family: 'Shippori Mincho', serif;
  font-size: 1.05rem;
  color: var(--washi);
  margin-bottom: 1.5rem;
  letter-spacing: 0.1em;
}

.footer-brand-en {
  display: block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  letter-spacing: 0.3em;
  color: var(--cyan-soft);
  margin-top: 0.3rem;
  font-weight: 500;
  text-transform: uppercase;
}

.footer-info {
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 0.85rem;
  line-height: 2;
  font-weight: 300;
}

.footer-col h4 {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  letter-spacing: 0.3em;
  color: var(--gold);
  margin-bottom: 1.5rem;
  font-weight: 500;
  text-transform: uppercase;
}

.footer-col ul {
  list-style: none;
}

.footer-col li {
  margin-bottom: 0.8rem;
}

.footer-col a {
  color: rgba(245, 241, 232, 0.7);
  text-decoration: none;
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 0.85rem;
  transition: color 0.3s;
  font-weight: 300;
}

.footer-col a:hover {
  color: var(--cyan-soft);
}

.footer-bottom {
  border-top: 1px solid rgba(245, 241, 232, 0.1);
  padding-top: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: rgba(245, 241, 232, 0.4);
  text-transform: uppercase;
}

/* ========== レスポンシブ ========== */
@media (max-width: 900px) {
  header { padding: 1rem 1.5rem; }
  nav ul { gap: 1rem; }
  nav a { font-size: 0.7rem; letter-spacing: 0.1em; }
  .page-header { padding: 7rem 1.5rem 3rem; }
  .content-section { padding: 4rem 1.5rem; }
  .footer-inner { 
    grid-template-columns: 1fr; 
    gap: 3rem; 
  }
  .footer-bottom { 
    flex-direction: column; 
    gap: 1rem; 
  }
  footer { padding: 4rem 1.5rem 2rem; }
}

@media (max-width: 600px) {
  .logo { font-size: 0.9rem; }
  .logo-sub { font-size: 0.6rem; }
  nav ul { gap: 0.8rem; }
  nav a { font-size: 0.65rem; letter-spacing: 0.08em; }
}