:root {
  --accent: #00a6a6;
  --dark: #0f1723;
  --muted: #6b7280;
  --glass: rgba(255,255,255,0.7);
  --shadow: 0 6px 18px rgba(12,18,25,0.08);
  --radius: 14px;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Hiragino Kaku Gothic ProN", "Noto Sans JP", "メイリオ", sans-serif;
}

body {
  margin: 0;
  background: #ffffff;
  color: var(--dark);
}

header.site-header {
  width: 100%;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(6px);
  background: linear-gradient(180deg, rgba(255,255,255,0.95), rgba(255,255,255,0.85));
  box-shadow: var(--shadow);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between; /* ロゴ左、ナビ中央、ハンバーガー右端 */
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--dark);
}
.logo-img {
  height: 48px;
  width: auto;
  display: block;
}
.logo .title {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}
.logo .brand { font-weight: 800; font-size: 18px; }
.logo .sub { font-size: 12px; color: var(--muted); }

nav.main-nav ul {
  display: flex;
  gap: 12px;
  list-style: none;
  margin: 0;
  padding: 0;
}
nav.main-nav a {
  text-decoration: none;
  color: var(--dark);
  padding: 8px 12px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 14px;
}
nav.main-nav a:hover {
  background: rgba(0,166,166,0.08);
  color: var(--accent);
}

/* ハンバーガー */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 4px;
  border: 0;
  background: none;
  cursor: pointer;
}
.hamburger span {
  width: 22px;
  height: 2px;
  background: var(--dark);
  border-radius: 2px;
}

/* モバイルドロワー */
.mobile-drawer {
  position: fixed;
  inset: 0;
  z-index: 200;
}
.mobile-drawer[hidden] {
  display: none;
}
.mobile-drawer .overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.4);
}
.mobile-drawer .panel {
  position: absolute;
  top: 0;
  right: 0;
  width: 70%;
  max-width: 300px;
  height: 100%;
  background: #fff;
  box-shadow: -4px 0 12px rgba(0,0,0,0.2);
  padding: 60px 20px 20px;
  transform: translateX(100%);
  transition: transform 0.3s ease;
}
.mobile-drawer.active .panel {
  transform: translateX(0);
}

/* 閉じるボタン */
.drawer-close {
  position: absolute;
  top: 15px;
  right: 15px;
  background: none;
  border: 0;
  font-size: 24px;
  cursor: pointer;
}

/* モバイルナビ */
.mobile-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.mobile-nav a {
  display: block;
  padding: 12px;
  border-radius: 8px;
  font-weight: 600;
  color: var(--dark);
  text-decoration: none;
  font-size: 16px;
}
.mobile-nav a:hover {
  background: rgba(0,166,166,0.08);
  color: var(--accent);
}

/* レスポンシブ */
@media (max-width: 880px) {
  nav.main-nav { display: none; }
  .hamburger { display: flex; }
}

.sr-only {
  position: absolute;
  height: 1px;
  width: 1px;
  overflow: hidden;
  clip: rect(1px,1px,1px,1px);
  white-space: nowrap;
}



h1 {
  text-align: center;
}

.container {
  margin: 0 auto;
  max-width: 1200px;
  padding: 16px;
  
}