/**
 * Frost Glass Styles
 * フロストガラスエフェクトのスタイル定義
 * 
 * 使用方法:
 * 1. frost-glass-core.js を読み込む
 * 2. このCSSファイルを読み込む
 * 3. 任意の要素に .frost-glass、.frost-glass-link、.frost-glass-header などのクラスを追加
 */

/* ===== 基本的なフロストガラスエフェクト ===== */
.frost-glass {
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.2) 0%,
    rgba(255, 255, 255, 0.08) 50%,
    rgba(255, 255, 255, 0.03) 100%
  );
  border: 1px solid rgba(255, 255, 255, 0.3);
  backdrop-filter: url(#glass-filter);
  -webkit-backdrop-filter: url(#glass-filter);
  box-shadow: 
    0 8px 32px rgba(0, 0, 0, 0.1),
    inset 0 1px 0 rgba(255, 255, 255, 0.5);
}

/* ===== リンクボタン用フロストガラス ===== */
/*
.frost-glass-link {
  display: inline-block;
  padding: 0.875rem 1.75rem;
  font-family: 'Orbitron', sans-serif;
  font-size: 0.875rem;
  font-weight: 600;
  color: white;
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.2) 0%,
    rgba(255, 255, 255, 0.08) 50%,
    rgba(255, 255, 255, 0.03) 100%
  );
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 0.5rem;
  backdrop-filter: url(#glass-filter);
  -webkit-backdrop-filter: url(#glass-filter);
  box-shadow: 
    0 8px 32px rgba(0, 0, 0, 0.1),
    inset 0 1px 0 rgba(255, 255, 255, 0.5);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.frost-glass-link::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.3),
    transparent
  );
  transition: left 0.5s ease;
}

.frost-glass-link:hover {
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.3) 0%,
    rgba(255, 255, 255, 0.15) 50%,
    rgba(255, 255, 255, 0.08) 100%
  );
  border-color: rgba(255, 255, 255, 0.5);
  box-shadow: 
    0 12px 40px rgba(0, 0, 0, 0.15),
    inset 0 1px 0 rgba(255, 255, 255, 0.6);
  transform: translateY(-2px);
}

.frost-glass-link:hover::before {
  left: 100%;
}

.frost-glass-link:active {
  transform: translateY(0);
  box-shadow: 
    0 4px 16px rgba(0, 0, 0, 0.1),
    inset 0 1px 0 rgba(255, 255, 255, 0.4);
}
*/

/* ===== ヘッダー用フロストガラス ===== */
.frost-glass-header {
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.2) 0%,
    rgba(255, 255, 255, 0.08) 50%,
    rgba(255, 255, 255, 0.03) 100%
  );
  border-bottom: 1px solid rgba(255, 255, 255, 0.3);
  backdrop-filter: url(#glass-filter);
  -webkit-backdrop-filter: url(#glass-filter);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
}

/* ===== ナビゲーション用フロストガラス ===== */
.frost-glass-nav {
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.2) 0%,
    rgba(255, 255, 255, 0.08) 50%,
    rgba(255, 255, 255, 0.03) 100%
  );
  border: 1px solid rgba(255, 255, 255, 0.3);
  backdrop-filter: url(#glass-filter);
  -webkit-backdrop-filter: url(#glass-filter);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
}

/* ===== カード用フロストガラス ===== */
.frost-glass-card {
  padding: 1.5rem;
  border-radius: 1rem;
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.2) 0%,
    rgba(255, 255, 255, 0.08) 50%,
    rgba(255, 255, 255, 0.03) 100%
  );
  border: 1px solid rgba(255, 255, 255, 0.3);
  backdrop-filter: url(#glass-filter);
  -webkit-backdrop-filter: url(#glass-filter);
  box-shadow: 
    0 8px 32px rgba(0, 0, 0, 0.1),
    inset 0 1px 0 rgba(255, 255, 255, 0.5);
  transition: all 0.3s ease;
}

.frost-glass-card:hover {
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.25) 0%,
    rgba(255, 255, 255, 0.12) 50%,
    rgba(255, 255, 255, 0.06) 100%
  );
  border-color: rgba(255, 255, 255, 0.4);
  box-shadow: 
    0 12px 40px rgba(0, 0, 0, 0.15),
    inset 0 1px 0 rgba(255, 255, 255, 0.6);
  transform: translateY(-4px);
}

/* ===== パネル/モーダル用フロストガラス ===== */
.frost-glass-panel {
  padding: 2rem;
  border-radius: 1.5rem;
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.2) 0%,
    rgba(255, 255, 255, 0.08) 50%,
    rgba(255, 255, 255, 0.03) 100%
  );
  border: 1px solid rgba(255, 255, 255, 0.3);
  backdrop-filter: url(#glass-filter);
  -webkit-backdrop-filter: url(#glass-filter);
  box-shadow: 
    0 16px 64px rgba(0, 0, 0, 0.2),
    inset 0 1px 0 rgba(255, 255, 255, 0.5);
}

/* ===== ボタン用フロストガラス ===== */
.frost-glass-button {
  padding: 0.75rem 1.5rem;
  border-radius: 0.5rem;
  font-weight: 600;
  color: white;
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.2) 0%,
    rgba(255, 255, 255, 0.08) 50%,
    rgba(255, 255, 255, 0.03) 100%
  );
  border: 1px solid rgba(255, 255, 255, 0.3);
  backdrop-filter: url(#glass-filter);
  -webkit-backdrop-filter: url(#glass-filter);
  box-shadow: 
    0 4px 16px rgba(0, 0, 0, 0.1),
    inset 0 1px 0 rgba(255, 255, 255, 0.5);
  cursor: pointer;
  transition: all 0.3s ease;
}

.frost-glass-button:hover {
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.3) 0%,
    rgba(255, 255, 255, 0.15) 50%,
    rgba(255, 255, 255, 0.08) 100%
  );
  border-color: rgba(255, 255, 255, 0.5);
  box-shadow: 
    0 6px 24px rgba(0, 0, 0, 0.15),
    inset 0 1px 0 rgba(255, 255, 255, 0.6);
  transform: translateY(-2px);
}

.frost-glass-button:active {
  transform: translateY(0);
  box-shadow: 
    0 2px 8px rgba(0, 0, 0, 0.1),
    inset 0 1px 0 rgba(255, 255, 255, 0.4);
}

/* ===== 弱めのフロストガラス（サブ要素用） ===== */
.frost-glass-subtle {
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.1) 0%,
    rgba(255, 255, 255, 0.04) 50%,
    rgba(255, 255, 255, 0.01) 100%
  );
  border: 1px solid rgba(255, 255, 255, 0.2);
  backdrop-filter: url(#glass-filter);
  -webkit-backdrop-filter: url(#glass-filter);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
}

/* ===== 強めのフロストガラス（強調要素用） ===== */
.frost-glass-strong {
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.3) 0%,
    rgba(255, 255, 255, 0.15) 50%,
    rgba(255, 255, 255, 0.08) 100%
  );
  border: 1px solid rgba(255, 255, 255, 0.4);
  backdrop-filter: url(#glass-filter);
  -webkit-backdrop-filter: url(#glass-filter);
  box-shadow: 
    0 12px 48px rgba(0, 0, 0, 0.15),
    inset 0 2px 0 rgba(255, 255, 255, 0.6);
}

/* ===== ダークテーマ用バリエーション ===== */
.frost-glass-dark {
  background: linear-gradient(
    135deg,
    rgba(0, 0, 0, 0.5) 0%,
    rgba(0, 0, 0, 0.3) 50%,
    rgba(0, 0, 0, 0.2) 100%
  );
  border: 1px solid rgba(255, 255, 255, 0.2);
  backdrop-filter: url(#glass-filter);
  -webkit-backdrop-filter: url(#glass-filter);
  box-shadow: 
    0 8px 32px rgba(0, 0, 0, 0.3),
    inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

/* ===== アニメーション ===== */
@keyframes frost-shimmer {
  0% {
    background-position: -100% 0;
  }
  100% {
    background-position: 100% 0;
  }
}

.frost-glass-shimmer {
  background-size: 200% 100%;
  animation: frost-shimmer 3s ease-in-out infinite;
}

/* ===== ユーティリティクラス ===== */
.frost-glass-rounded {
  border-radius: 0.5rem;
}

.frost-glass-rounded-lg {
  border-radius: 1rem;
}

.frost-glass-rounded-xl {
  border-radius: 1.5rem;
}

.frost-glass-rounded-full {
  border-radius: 9999px;
}

/* ===== Firefox: data-browser属性による確実なフォールバック ===== */
[data-browser="firefox"] .frost-glass,
[data-browser="firefox"] .frost-glass-header,
[data-browser="firefox"] .frost-glass-nav,
[data-browser="firefox"] .frost-glass-card,
[data-browser="firefox"] .frost-glass-panel,
[data-browser="firefox"] .frost-glass-button,
[data-browser="firefox"] .frost-glass-subtle,
[data-browser="firefox"] .frost-glass-strong,
[data-browser="firefox"] .frost-glass-dark {
  backdrop-filter: blur(18px) saturate(180%) brightness(1.06);
  -webkit-backdrop-filter: blur(18px) saturate(180%) brightness(1.06);
}