/* ========== ヘッダー ========== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 12px clamp(16px, 4vw, 32px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #2C292A; /* SVG公式の黒背景色と完全一致 */
  /* ロゴの切り替えと完全に同時にパッと変わるようアニメーション遅延を撤廃 */
  transition: none;
}

.site-header.scrolled {
  background: #FFFFFF; /* スクロール後は完全な白に切り替え */
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

/* ロゴ（スパナくんを大きく強調・サイズ完全固定） */
.header-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  z-index: 1001;
}

.header-logo .logo-img {
  height: clamp(52px, 7vw, 72px); /* スパナくんを大きく写す（スクロール前後でサイズ不変） */
  width: auto;
  object-fit: contain;
  transition: transform 0.3s ease;
}

.header-logo:hover .logo-img {
  transform: scale(1.04);
}

/* スクロール前（黒背景時）：白ロゴを表示、黒ロゴを非表示 */
.site-header:not(.scrolled) .logo-dark {
  display: none;
}
.site-header:not(.scrolled) .logo-white {
  display: block;
}

/* スクロール後（白背景時）：黒ロゴを表示、白ロゴを非表示 */
.site-header.scrolled .logo-white {
  display: none;
}
.site-header.scrolled .logo-dark {
  display: block;
}

/* ナビゲーション */
.header-nav {
  display: flex;
  align-items: center;
  gap: clamp(20px, 3vw, 36px);
}

.header-nav a {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-white);
  position: relative;
  padding: 6px 0;
}

.header-nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 3px;
  background: var(--gradient-rainbow-h);
  border-radius: 2px;
  transition: width 0.3s ease;
}

.header-nav a:hover::after {
  width: 100%;
}

.site-header.scrolled .header-nav a {
  color: var(--color-black);
}

/* TELボタン */
.header-tel {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.92rem;
  font-weight: 800;
  color: var(--color-white);
  background: rgba(255, 255, 255, 0.18);
  padding: 10px 20px;
  border-radius: 100px;
  border: 1px solid rgba(255, 255, 255, 0.35);
  backdrop-filter: blur(8px);
  transition: var(--transition);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.site-header.scrolled .header-tel {
  color: var(--color-black);
  background: var(--color-white-soft);
  border-color: var(--color-gray-light);
  box-shadow: var(--paint-gloss);
}

.header-tel:hover {
  background: var(--color-accent);
  color: #fff !important;
  border-color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px var(--color-accent-glow);
}

/* ハンバーガーボタン（スマホ用・タップ領域48px確保） */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 6px;
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 8px;
  cursor: pointer;
  width: 44px;
  height: 44px;
  padding: 8px;
  z-index: 1001;
  transition: var(--transition-fast);
}

.site-header.scrolled .hamburger {
  background: var(--color-white-soft);
  border-color: var(--color-gray-light);
}

.hamburger span {
  display: block;
  width: 22px;
  height: 2.5px;
  background: var(--color-white);
  transition: var(--transition);
  border-radius: 2px;
}

.site-header.scrolled .hamburger span {
  background: var(--color-black);
}

.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(6px, 6px); background: var(--color-black); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(6px, -6px); background: var(--color-black); }

/* モバイルメニュー */
.mobile-menu {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  z-index: 999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 24px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.35s ease;
  padding: 40px 24px;
}

.mobile-menu.active {
  display: flex;
  opacity: 1;
  pointer-events: all;
}

.mobile-menu a {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--color-black);
  padding: 10px 20px;
  border-radius: 8px;
  transition: var(--transition-fast);
}

.mobile-menu a:hover {
  color: var(--color-accent);
  background: rgba(230, 57, 70, 0.06);
}

/* ========== フッター ========== */
.site-footer {
  background: var(--color-black);
  color: #fff;
  padding: clamp(48px, 6vw, 80px) clamp(16px, 4vw, 32px) 28px;
  position: relative;
  overflow: hidden;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: clamp(32px, 5vw, 64px);
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.footer-logo img {
  height: clamp(52px, 6vw, 68px);
  width: auto;
  margin-bottom: 16px;
  filter: brightness(0) invert(1);
  opacity: 0.95;
}

.footer-logo p {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.7;
}

.footer-info h4,
.footer-sns h4 {
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.45);
  margin-bottom: 18px;
  font-family: var(--font-heading);
  font-weight: 800;
}

.footer-info p,
.footer-info a {
  font-size: 0.94rem;
  color: rgba(255, 255, 255, 0.8);
  line-height: 2.1;
}

.footer-info a:hover,
.footer-sns a:hover {
  color: #fff;
}

.footer-sns a {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.95rem;
  padding: 4px 0;
  transition: color 0.2s;
}

.footer-bottom {
  max-width: var(--max-width);
  margin: 28px auto 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.4);
}

/* ========== レスポンシブ（タブレット・スマホ対応） ========== */
@media (max-width: 960px) {
  .header-nav, .header-tel {
    display: none;
  }
  .hamburger {
    display: flex;
  }
  .footer-inner {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }
}

@media (max-width: 640px) {
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 10px;
    text-align: center;
  }
}