/* ===============================
   SingKANA Whitepaper Style v1.0
   =============================== */

/* ベース */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
               "Helvetica Neue", Arial, "Noto Sans JP", sans-serif;
  background: #050814;
  color: #f5f7ff;
  line-height: 1.7;
  scroll-behavior: smooth;
}

a {
  color: #a5b4ff;
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

/* コンテナ共通 */
.wp-shell {
  max-width: 960px;
  margin: 0 auto;
  padding: 3rem 1.5rem 4rem;
}

/* ===============================
   HERO
   =============================== */

.wp-hero {
  background: radial-gradient(circle at 0% 0%, #22d3ee 0, transparent 50%),
              radial-gradient(circle at 100% 0%, #a855f7 0, transparent 55%),
              linear-gradient(135deg, #111827 0%, #020617 55%, #050816 100%);
  color: #f9fafb;
  padding: 4rem 1.5rem 3rem;
  border-bottom: 1px solid rgba(148, 163, 184, 0.2);
}

.wp-hero-inner {
  max-width: 960px;
  margin: 0 auto;
}

.wp-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  background: rgba(15, 23, 42, 0.7);
  border: 1px solid rgba(148, 163, 184, 0.3);
  color: #e5e7eb;
  margin-bottom: 1rem;
}

.wp-badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: #22c55e;
  box-shadow: 0 0 0 4px rgba(34, 197, 94, 0.3);
}

.wp-hero h1 {
  font-size: clamp(2rem, 3vw + 1.2rem, 2.8rem);
  margin: 0 0 0.5rem;
}

.wp-hero-sub {
  font-size: 0.95rem;
  color: #e5e7eb;
  opacity: 0.9;
  margin-bottom: 2rem;
}

/* 言語切替ボタン */
.wp-lang-switch {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.wp-lang-switch button {
  cursor: pointer;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.6);
  background: rgba(15, 23, 42, 0.8);
  color: #e5e7eb;
  padding: 0.5rem 1.1rem;
  font-size: 0.85rem;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  transition: all 0.15s ease-out;
}

.wp-lang-switch button:hover {
  background: rgba(30, 64, 175, 0.9);
  border-color: #818cf8;
  box-shadow: 0 10px 30px rgba(79, 70, 229, 0.35);
}

.wp-lang-switch button.wp-active {
  background: linear-gradient(135deg, #6366f1, #a855f7);
  border-color: transparent;
  color: white;
}

/* ===============================
   ナビゲーション（章リンク）
   =============================== */

.wp-nav {
  backdrop-filter: blur(16px);
  background: linear-gradient(to bottom,
              rgba(15, 23, 42, 0.9),
              rgba(15, 23, 42, 0.98));
  border-bottom: 1px solid rgba(55, 65, 81, 0.7);
}

.wp-nav-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}

.wp-nav-label {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #9ca3af;
  margin-right: 0.75rem;
}

.wp-nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.8rem;
}

.wp-nav-links a {
  font-size: 0.8rem;
  color: #e5e7eb;
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.85);
  border: 1px solid transparent;
  transition: all 0.15s ease-out;
}

.wp-nav-links a:hover {
  border-color: rgba(129, 140, 248, 0.9);
  background: rgba(30, 64, 175, 0.9);
}

/* ===============================
   セクション
   =============================== */

.wp-section {
  padding: 3rem 0 0;
  border-top: 1px solid rgba(31, 41, 55, 0.9);
}

.wp-section:first-of-type {
  border-top: none;
}

.wp-section h2 {
  font-size: 1.4rem;
  margin: 0 0 1rem;
  color: #e5e7eb;
}

.wp-section h3 {
  font-size: 1.1rem;
  margin: 1.5rem 0 0.5rem;
  color: #e5e7eb;
}

.wp-lead {
  font-size: 0.97rem;
  color: #e5e7eb;
  margin-bottom: 1rem;
}

.wp-section ul {
  margin: 0.5rem 0 1.25rem 1.2rem;
  padding: 0;
}

.wp-section li {
  margin-bottom: 0.35rem;
}

/* 2カラムっぽいボックス（必要な章に使える） */
.wp-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
  gap: 1.5rem;
  margin-top: 1.25rem;
}

.wp-card {
  background: radial-gradient(circle at 0 0, rgba(79, 70, 229, 0.28), transparent 55%),
              radial-gradient(circle at 100% 100%, rgba(14, 165, 233, 0.2), transparent 55%),
              #020617;
  border-radius: 1rem;
  padding: 1.4rem 1.25rem;
  border: 1px solid rgba(55, 65, 81, 0.9);
  box-shadow: 0 18px 45px rgba(15, 23, 42, 0.9);
}

.wp-card-title {
  font-size: 0.92rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #9ca3af;
  margin-bottom: 0.6rem;
}

/* ===============================
   フッター
   =============================== */

.wp-footer {
  border-top: 1px solid rgba(31, 41, 55, 0.9);
  padding: 1.5rem 1.5rem 2.5rem;
  font-size: 0.8rem;
  color: #9ca3af;
  text-align: center;
}

/* ===============================
   レスポンシブ
   =============================== */

@media (max-width: 768px) {
  .wp-hero {
    padding: 3rem 1.25rem 2rem;
  }
  .wp-shell {
    padding: 2.5rem 1.25rem 3rem;
  }
  .wp-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* ===============================
   Layout: align hero / nav / body
   =============================== */

/* ヒーロー・ナビ・本文の左右位置を完全に揃える */
.wp-hero-inner,
.wp-nav-inner,
.wp-shell {
  max-width: 900px;        /* ヒーローと本文の列幅を統一（好みで 960 でもOK） */
  margin: 0 auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

/* 本文コンテナの上下パディングだけ個別指定 */
.wp-shell {
  padding-top: 3rem;
  padding-bottom: 4rem;
}

/* セクションはシェルの中でフラットに並べる */
.wp-section {
  padding-left: 0;
  padding-right: 0;
}