/* ============================================================
   SNS Share Buttons v5
   常時表示・背景バーなし・ページ読み込み時アニメーションのみ
   JS依存なし — CSSだけで完結
   ============================================================ */

/* ── コンテナ（背景なし・常時表示） ── */
.sns-share-bar {
  position: fixed;
  bottom: 16px;
  left: 0;
  right: 0;
  z-index: 9999;
  background: transparent;
  border: none;
  padding: 0;
  margin: 0;
  pointer-events: none;
}

/* ── ボタン横並び ────────────────── */
.sns-share-bar__inner {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 12px;
}

/* ── 各アイコンボタン ────────────── */
.sns-share-bar__btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  border: none;
  border-radius: 12px;
  color: #fff;
  text-decoration: none;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  pointer-events: auto;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
  -webkit-tap-highlight-color: transparent;
  /* ページ読み込み時のアニメーション（JSクラス不要・自動発火） */
  animation: snsPop 0.55s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards,
             snsPulse 2s ease-in-out 1.4s 1;
  /* アニメーション前の初期状態 */
  opacity: 0;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1),
              box-shadow 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── 時差つきポップイン ──────────── */
.sns-share-bar__btn:nth-child(1) { animation-delay: 0.06s, 1.4s; }
.sns-share-bar__btn:nth-child(2) { animation-delay: 0.14s, 1.4s; }
.sns-share-bar__btn:nth-child(3) { animation-delay: 0.22s, 1.4s; }
.sns-share-bar__btn:nth-child(4) { animation-delay: 0.30s, 1.4s; }
.sns-share-bar__btn:nth-child(5) { animation-delay: 0.38s, 1.4s; }

@keyframes snsPop {
  0%   { opacity: 0; transform: scale(0.3) translateY(16px); }
  50%  { opacity: 1; transform: scale(1.1) translateY(-3px); }
  75%  { opacity: 1; transform: scale(0.95) translateY(1px); }
  100% { opacity: 1; transform: scale(1) translateY(0); }
}

@keyframes snsPulse {
  0%, 100% { transform: scale(1); }
  50%      { transform: scale(1.08); }
}

/* ── アイコンサイズ統一（20×20px） ── */
.sns-share-bar__btn svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ── ホバー: 浮き上がり + カラーグロー ── */
.sns-share-bar__btn:hover {
  transform: translateY(-5px) scale(1.08);
}

.sns-share-bar__btn:hover svg {
  transform: scale(1.18) rotate(-6deg);
}

.sns-btn--x:hover    { box-shadow: 0 8px 28px rgba(15, 52, 96, 0.5); }
.sns-btn--fb:hover   { box-shadow: 0 8px 28px rgba(24, 119, 242, 0.5); }
.sns-btn--line:hover { box-shadow: 0 8px 28px rgba(6, 199, 85, 0.5); }
.sns-btn--ig:hover   { box-shadow: 0 8px 28px rgba(225, 48, 108, 0.5); }
.sns-btn--copy:hover { box-shadow: 0 8px 28px rgba(108, 92, 231, 0.5); }

/* ── アクティブ（押下） ──────────── */
.sns-share-bar__btn:active {
  transform: translateY(0) scale(0.9);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
  transition: transform 0.1s, box-shadow 0.1s;
}

/* ── シマーエフェクト（光が横切る） ── */
.sns-share-bar__btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 60%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.35),
    transparent
  );
  pointer-events: none;
}

.sns-share-bar__btn:hover::before {
  animation: snsShimmer 0.5s ease forwards;
}

@keyframes snsShimmer {
  to { left: 150%; }
}

/* ── ホバーオーバーレイ ──────────── */
.sns-share-bar__btn::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.12);
  opacity: 0;
  transition: opacity 0.25s;
  pointer-events: none;
}

.sns-share-bar__btn:hover::after {
  opacity: 1;
}

/* ── リップルエフェクト ──────────── */
.sns-share-bar__btn .ripple {
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.4);
  transform: scale(0);
  animation: snsRipple 0.55s ease-out forwards;
  pointer-events: none;
}

@keyframes snsRipple {
  to {
    transform: scale(4);
    opacity: 0;
  }
}

/* ── グラデーション配色 ────────────── */
.sns-btn--x    { background: linear-gradient(135deg, #1a1a2e, #16213e, #0f3460); }
.sns-btn--fb   { background: linear-gradient(135deg, #1877f2, #3b5fde, #6c5ce7); }
.sns-btn--line { background: linear-gradient(135deg, #06c755, #00b894, #00cec9); }
.sns-btn--ig   { background: linear-gradient(135deg, #f09433, #e6683c, #dc2743, #cc2366, #bc1888); }
.sns-btn--copy { background: linear-gradient(135deg, #636e72, #6c5ce7, #a29bfe); }

/* ── コピー完了トースト ────────────── */
.sns-share-bar__toast {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #00b894, #00cec9);
  border-radius: 12px;
  font-family: -apple-system, BlinkMacSystemFont, 'Hiragino Sans', sans-serif;
  font-size: 11px;
  font-weight: 700;
  color: #fff;
  opacity: 0;
  transform: scale(0.7);
  pointer-events: none;
  transition: opacity 0.25s, transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.sns-share-bar__toast.is-visible {
  opacity: 1;
  transform: scale(1);
}

/* ── レスポンシブ ──────────────────── */
@media (max-width: 400px) {
  .sns-share-bar {
    bottom: 12px;
  }
  .sns-share-bar__inner {
    gap: 8px;
  }
  .sns-share-bar__btn {
    width: 42px;
    height: 42px;
    border-radius: 10px;
  }
  .sns-share-bar__btn svg {
    width: 18px;
    height: 18px;
  }
  .sns-share-bar__toast {
    border-radius: 10px;
  }
}