@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@300;400;500;700;900&family=Inter:wght@300;400;600;700&display=swap');

:root {
  --bg-primary: #0a0e1a;
  --bg-card: #111827;
  --bg-card-hover: #1a2332;
  --border-subtle: rgba(255,255,255,0.06);
  --border-accent: rgba(99,102,241,0.3);
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent-indigo: #818cf8;
  --accent-blue: #60a5fa;
  --accent-emerald: #34d399;
  --accent-amber: #fbbf24;
  --accent-rose: #fb7185;
  --accent-purple: #c084fc;
  --gradient-hero: linear-gradient(135deg, #1e1b4b 0%, #0f172a 50%, #042f2e 100%);
  --gradient-accent: linear-gradient(135deg, #818cf8, #60a5fa);
  --shadow-card: 0 4px 24px rgba(0,0,0,0.3);
  --shadow-glow: 0 0 40px rgba(99,102,241,0.1);
  --radius: 16px;
  --radius-sm: 10px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Noto Sans JP', 'Inter', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.8;
  min-height: 100vh;
}

/* ナビゲーション */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  backdrop-filter: blur(20px);
  background: rgba(10,14,26,0.85);
  border-bottom: 1px solid var(--border-subtle);
  padding: 0.75rem 2rem;
  display: flex; align-items: center; justify-content: space-between;
}
.nav-brand {
  font-size: 1.1rem; font-weight: 700;
  background: var(--gradient-accent);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.nav-links { display: flex; gap: 1.5rem; list-style: none; }
.nav-links a {
  color: var(--text-secondary); text-decoration: none; font-size: 0.85rem;
  font-weight: 500; transition: color 0.3s;
}
.nav-links a:hover { color: var(--accent-indigo); }

/* ヒーロー */
.hero {
  background: var(--gradient-hero);
  padding: 8rem 2rem 4rem;
  text-align: center;
  position: relative; overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute; top: -50%; left: -50%; width: 200%; height: 200%;
  background: radial-gradient(circle at 30% 50%, rgba(99,102,241,0.08) 0%, transparent 50%),
              radial-gradient(circle at 70% 80%, rgba(52,211,153,0.05) 0%, transparent 50%);
  animation: heroFloat 20s ease-in-out infinite;
}
@keyframes heroFloat {
  0%,100% { transform: translate(0,0); }
  50% { transform: translate(-2%,2%); }
}
.hero-content { position: relative; z-index: 1; max-width: 800px; margin: 0 auto; }
.hero-badge {
  display: inline-block; padding: 0.4rem 1.2rem; border-radius: 50px;
  background: rgba(99,102,241,0.15); border: 1px solid rgba(99,102,241,0.3);
  color: var(--accent-indigo); font-size: 0.8rem; font-weight: 600;
  margin-bottom: 1.5rem; letter-spacing: 0.05em;
}
.hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.8rem); font-weight: 900;
  line-height: 1.4; margin-bottom: 1rem;
  background: linear-gradient(135deg, #f1f5f9, #cbd5e1);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.hero p { color: var(--text-secondary); font-size: 1rem; max-width: 600px; margin: 0 auto; }

/* コンテナ */
.container { max-width: 960px; margin: 0 auto; padding: 3rem 1.5rem; }

/* セクション */
.section { margin-bottom: 4rem; animation: fadeUp 0.6s ease-out both; }
.section:nth-child(2) { animation-delay: 0.1s; }
.section:nth-child(3) { animation-delay: 0.2s; }
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}

.section-label {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-size: 0.75rem; font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.1em; color: var(--accent-indigo); margin-bottom: 0.75rem;
}
.section-title {
  font-size: 1.5rem; font-weight: 800; margin-bottom: 1.5rem;
  line-height: 1.4;
}

/* カード */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  padding: 1.75rem;
  margin-bottom: 1.25rem;
  box-shadow: var(--shadow-card);
  transition: border-color 0.3s, box-shadow 0.3s, transform 0.3s;
}
.card:hover {
  border-color: var(--border-accent);
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}
.card h3 {
  font-size: 1.1rem; font-weight: 700; margin-bottom: 0.75rem;
  display: flex; align-items: center; gap: 0.5rem;
}
.card p, .card li { color: var(--text-secondary); font-size: 0.9rem; }
.card ul { list-style: none; padding: 0; }
.card li { padding: 0.3rem 0; padding-left: 1.2rem; position: relative; }
.card li::before {
  content: '▸'; position: absolute; left: 0; color: var(--accent-indigo);
}

/* テーブル */
.table-wrap {
  overflow-x: auto; border-radius: var(--radius);
  border: 1px solid var(--border-subtle); margin: 1rem 0;
}
table { width: 100%; border-collapse: collapse; font-size: 0.85rem; }
th {
  background: rgba(99,102,241,0.1); color: var(--accent-indigo);
  text-align: left; padding: 0.75rem 1rem; font-weight: 600;
  border-bottom: 1px solid var(--border-subtle);
}
td {
  padding: 0.75rem 1rem; border-bottom: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}
tr:last-child td { border-bottom: none; }
tr:hover td { background: rgba(99,102,241,0.03); }

/* アラート */
.alert {
  padding: 1rem 1.25rem; border-radius: var(--radius-sm);
  margin: 1rem 0; font-size: 0.85rem; border-left: 4px solid;
}
.alert-caution {
  background: rgba(251,113,133,0.08); border-color: var(--accent-rose);
  color: #fca5a5;
}
.alert-warning {
  background: rgba(251,191,36,0.08); border-color: var(--accent-amber);
  color: #fcd34d;
}
.alert-info {
  background: rgba(96,165,250,0.08); border-color: var(--accent-blue);
  color: #93c5fd;
}
.alert-title { font-weight: 700; margin-bottom: 0.3rem; }

/* 専門家カード */
.expert-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1rem;
  transition: border-color 0.3s, transform 0.3s;
}
.expert-card:hover {
  border-color: var(--border-accent);
  transform: translateY(-2px);
}
.expert-header { display: flex; align-items: center; gap: 1rem; margin-bottom: 1rem; }
.expert-avatar {
  width: 48px; height: 48px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.3rem; flex-shrink: 0;
}
.expert-avatar.law { background: linear-gradient(135deg, #818cf8, #6366f1); }
.expert-avatar.biz { background: linear-gradient(135deg, #34d399, #059669); }
.expert-avatar.ops { background: linear-gradient(135deg, #fbbf24, #d97706); }
.expert-name { font-size: 1rem; font-weight: 700; }
.expert-title { font-size: 0.8rem; color: var(--text-muted); }

/* 引用 */
.quote {
  border-left: 3px solid var(--accent-indigo);
  padding: 0.75rem 1rem; margin: 0.75rem 0;
  background: rgba(99,102,241,0.05); border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.88rem; color: var(--text-secondary); font-style: italic;
}

/* フロー図 */
.flow-box {
  background: rgba(251,113,133,0.06); border: 1px solid rgba(251,113,133,0.2);
  border-radius: var(--radius); padding: 1.5rem; text-align: center; margin: 1.5rem 0;
}
.flow-box .flow-title { color: var(--accent-rose); font-weight: 700; margin-bottom: 1rem; font-size: 0.95rem; }
.flow-step {
  color: var(--text-secondary); font-size: 0.85rem; padding: 0.4rem 0;
}
.flow-arrow { color: var(--accent-rose); font-size: 1.2rem; }

/* 結論セクション */
.conclusion-card {
  background: linear-gradient(135deg, rgba(99,102,241,0.1), rgba(52,211,153,0.05));
  border: 1px solid rgba(99,102,241,0.2);
  border-radius: var(--radius); padding: 2rem; margin: 1.5rem 0;
}
.conclusion-card h3 { color: var(--accent-indigo); }

/* バッジ */
.badge {
  display: inline-block; padding: 0.2rem 0.7rem; border-radius: 50px;
  font-size: 0.75rem; font-weight: 600;
}
.badge-high { background: rgba(52,211,153,0.15); color: var(--accent-emerald); }
.badge-mid  { background: rgba(251,191,36,0.15); color: var(--accent-amber); }
.badge-low  { background: rgba(251,113,133,0.15); color: var(--accent-rose); }

/* セパレータ */
.divider {
  height: 1px; background: var(--border-subtle);
  margin: 3rem 0; position: relative;
}
.divider::after {
  content: '◆'; position: absolute; top: 50%; left: 50%;
  transform: translate(-50%,-50%);
  background: var(--bg-primary); padding: 0 1rem;
  color: var(--text-muted); font-size: 0.7rem;
}

/* フッター */
.footer {
  text-align: center; padding: 3rem 2rem;
  border-top: 1px solid var(--border-subtle);
  color: var(--text-muted); font-size: 0.8rem;
}

/* タブ */
.tab-nav {
  display: flex; gap: 0.25rem; margin-bottom: 2rem;
  border-bottom: 1px solid var(--border-subtle); padding-bottom: 0;
}
.tab-btn {
  padding: 0.75rem 1.5rem; border: none; background: none;
  color: var(--text-muted); font-size: 0.9rem; font-weight: 600;
  cursor: pointer; border-bottom: 2px solid transparent;
  transition: all 0.3s; font-family: inherit;
}
.tab-btn:hover { color: var(--text-secondary); }
.tab-btn.active {
  color: var(--accent-indigo);
  border-bottom-color: var(--accent-indigo);
}
.tab-content { display: none; }
.tab-content.active { display: block; animation: fadeUp 0.4s ease-out; }

/* アクションリスト */
.action-list { counter-reset: action; list-style: none; padding: 0; }
.action-item {
  display: flex; gap: 1rem; padding: 1rem 0;
  border-bottom: 1px solid var(--border-subtle);
}
.action-item:last-child { border-bottom: none; }
.action-num {
  width: 32px; height: 32px; border-radius: 50%;
  background: rgba(99,102,241,0.15); color: var(--accent-indigo);
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 0.85rem; flex-shrink: 0;
}
.action-body h4 { font-size: 0.95rem; font-weight: 700; margin-bottom: 0.25rem; }
.action-body p { font-size: 0.85rem; color: var(--text-secondary); }

/* レスポンシブ */
@media (max-width: 768px) {
  .nav { padding: 0.75rem 1rem; }
  .nav-links { display: none; }
  .hero { padding: 6rem 1rem 3rem; }
  .container { padding: 2rem 1rem; }
  .tab-btn { padding: 0.5rem 0.75rem; font-size: 0.8rem; }
}