/* =============================================
 *  海底 3.2×10⁵マイル — 音響オペレーション
 *  style.css — iOS Liquid Glass Edition
 *
 *  Apple visionOS / iOS 18 流体ガラス質感
 *  深海バイオルミネセンス × リキッドグラス
 * ============================================= */

/* ─────────────────────────────
 * 1. CSS Custom Properties
 * ───────────────────────────── */

:root,
[data-theme="dark"] {
  /* 背景（深海深度グラデーション） */
  --bg-abyss: #030a14;
  --bg-gradient: radial-gradient(circle at 50% -10%, #0a223c 0%, #04101e 50%, #01060c 100%);

  /* アンビエント発光（水中光芒・屈折用） */
  --ambient-1: rgba(26, 120, 180, 0.35);
  --ambient-2: rgba(16, 160, 180, 0.28);
  --ambient-3: rgba(10, 70, 120, 0.4);

  /* ═══ リキッドグラス カード（深海クリスタル・リキッドフロストガラス） ═══ */
  /* 上部は透明水滴のスペキュラー光沢を保ちつつ、下部へ向けて深海バッキングを敷くことで文字・波形の高可読性を両立 */
  --glass-card-bg: linear-gradient(
    165deg,
    rgba(255, 255, 255, 0.16) 0%,
    rgba(14, 38, 64, 0.48) 45%,
    rgba(6, 20, 38, 0.76) 100%
  );
  --glass-card-backdrop: blur(28px) saturate(190%) brightness(1.04);
  --glass-card-border: rgba(255, 255, 255, 0.32);
  --glass-card-border-hover: rgba(62, 207, 207, 0.85);
  --glass-card-shadow:
    inset 0 1.5px 2.5px 0 rgba(255, 255, 255, 0.7),
    inset 1px 0 1.5px 0 rgba(255, 255, 255, 0.35),
    inset 0 -1.5px 2px 0 rgba(0, 0, 0, 0.4),
    0 22px 50px -10px rgba(0, 4, 16, 0.75),
    0 4px 16px rgba(0, 0, 0, 0.4);

  --glass-card-playing-shadow:
    inset 0 1.5px 3px 0 rgba(255, 255, 255, 0.9),
    inset 0 0 28px rgba(62, 207, 207, 0.35),
    0 26px 60px -6px rgba(0, 4, 16, 0.85),
    0 0 44px rgba(62, 207, 207, 0.48);

  /* ガラスピル・ボタン（フロストガラス小石・水滴） */
  --glass-btn-bg: linear-gradient(135deg, rgba(255, 255, 255, 0.18) 0%, rgba(255, 255, 255, 0.04) 100%);
  --glass-btn-border: rgba(255, 255, 255, 0.28);
  --glass-btn-shadow:
    inset 0 1px 1.5px rgba(255, 255, 255, 0.5),
    inset 0 -1px 1px rgba(0, 0, 0, 0.3),
    0 4px 14px rgba(0, 0, 0, 0.3);
  --glass-btn-hover-bg: linear-gradient(135deg, rgba(255, 255, 255, 0.3) 0%, rgba(255, 255, 255, 0.1) 100%);

  /* 再生オーブ（中央ガラス玉ボタン） */
  --orb-bg: linear-gradient(135deg, rgba(255, 255, 255, 0.28) 0%, rgba(255, 255, 255, 0.08) 100%);
  --orb-border: rgba(255, 255, 255, 0.38);
  --orb-shadow:
    inset 0 2px 3px rgba(255, 255, 255, 0.65),
    inset 0 -1.5px 2px rgba(0, 0, 0, 0.35),
    0 8px 24px rgba(0, 0, 0, 0.45);

  /* テキスト（透明ガラス上でクッキリ読める発色） */
  --text-main: #ffffff;
  --text-sub: #b8d2eb;
  --text-dim: #84a2be;

  /* アクセント（深海バイオルミネセンス・発光シアン） */
  --accent-cyan: #3ecfcf;
  --accent-cyan-glow: rgba(62, 207, 207, 0.55);
  --accent-dim: rgba(62, 207, 207, 0.2);

  /* ヘッダー */
  --header-bg: rgba(4, 12, 22, 0.55);
  --header-border: rgba(255, 255, 255, 0.16);

  /* 波形 & シーク */
  --waveform-inactive: rgba(180, 220, 255, 0.35);
  --seek-track-bg: rgba(255, 255, 255, 0.16);

  /* フォーマットバッジ */
  --badge-bg: rgba(255, 255, 255, 0.14);
  --badge-border: rgba(255, 255, 255, 0.22);
  --badge-text: #cde4f8;

  color-scheme: dark;
}

[data-theme="light"] {
  /* 背景 */
  --bg-abyss: #dce7f2;
  --bg-gradient: radial-gradient(circle at 50% 0%, #edf4fa 0%, #dbe7f2 60%, #c8dae8 100%);

  /* アンビエント発光 */
  --ambient-1: rgba(140, 205, 245, 0.45);
  --ambient-2: rgba(90, 185, 215, 0.35);
  --ambient-3: rgba(155, 215, 245, 0.4);

  /* ═══ リキッドグラス カード（ライトモード・クリスタルクリア） ═══ */
  --glass-card-bg: linear-gradient(
    165deg,
    rgba(255, 255, 255, 0.88) 0%,
    rgba(240, 248, 255, 0.68) 48%,
    rgba(220, 238, 252, 0.82) 100%
  );
  --glass-card-backdrop: blur(28px) saturate(180%) brightness(1.02);
  --glass-card-border: rgba(255, 255, 255, 0.9);
  --glass-card-border-hover: rgba(26, 138, 138, 0.85);
  --glass-card-shadow:
    inset 0 1.5px 2px 0 rgba(255, 255, 255, 0.95),
    inset 0 -1.5px 2px 0 rgba(0, 40, 80, 0.08),
    0 20px 44px -8px rgba(0, 40, 80, 0.15),
    0 4px 14px rgba(0, 40, 80, 0.08);

  --glass-card-playing-shadow:
    inset 0 1.5px 2.5px 0 rgba(255, 255, 255, 1),
    inset 0 0 24px rgba(26, 138, 138, 0.2),
    0 24px 50px -6px rgba(0, 40, 80, 0.22),
    0 0 36px rgba(26, 138, 138, 0.35);

  /* ガラスピル・ボタン */
  --glass-btn-bg: linear-gradient(135deg, rgba(255, 255, 255, 0.88) 0%, rgba(255, 255, 255, 0.55) 100%);
  --glass-btn-border: rgba(255, 255, 255, 0.9);
  --glass-btn-shadow:
    inset 0 1px 1.5px rgba(255, 255, 255, 1),
    0 3px 10px rgba(0, 40, 80, 0.1);
  --glass-btn-hover-bg: linear-gradient(135deg, rgba(255, 255, 255, 1) 0%, rgba(255, 255, 255, 0.75) 100%);

  /* 再生オーブ */
  --orb-bg: linear-gradient(135deg, rgba(255, 255, 255, 1) 0%, rgba(225, 242, 255, 0.8) 100%);
  --orb-border: rgba(255, 255, 255, 0.95);
  --orb-shadow:
    inset 0 2px 3px rgba(255, 255, 255, 1),
    0 8px 20px rgba(0, 40, 80, 0.16);

  /* テキスト */
  --text-main: #0a1b2b;
  --text-sub: #334d65;
  --text-dim: #607990;

  /* アクセント */
  --accent-cyan: #1a8a8a;
  --accent-cyan-glow: rgba(26, 138, 138, 0.35);
  --accent-dim: rgba(26, 138, 138, 0.14);

  /* ヘッダー */
  --header-bg: rgba(220, 231, 242, 0.65);
  --header-border: rgba(255, 255, 255, 0.6);

  /* 波形 & シーク */
  --waveform-inactive: rgba(60, 90, 120, 0.28);
  --seek-track-bg: rgba(0, 40, 80, 0.1);

  /* フォーマットバッジ */
  --badge-bg: rgba(0, 40, 80, 0.08);
  --badge-border: rgba(0, 40, 80, 0.14);
  --badge-text: #233b50;

  color-scheme: light;
}

/* ─────────────────────────────
 * 2. リセット & ベース
 * ───────────────────────────── */

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family:
    -apple-system, BlinkMacSystemFont,
    'SF Pro Display', 'SF Pro Text',
    'Hiragino Kaku Gothic ProN', 'Hiragino Sans',
    'Noto Sans JP', sans-serif;
  background: var(--bg-abyss);
  background-image: var(--bg-gradient);
  background-attachment: fixed;
  color: var(--text-main);
  min-height: 100dvh;
  overflow-x: hidden;
  position: relative;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ═════════════════════════════════════════════
 * 深海ワールド背景（海中アート ＆ サンレイ光芒 ＆ 上昇気泡アニメーション）
 * ═════════════════════════════════════════════ */

.ocean-world {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

/* 海中アート画像背景（高解像度16:9アンダーウォーター・完全静止で酔いを解消） */
.ocean-bg-image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  background: url('../assets/underwater-bg.webp') center center / cover no-repeat;
  filter: saturate(1.14) contrast(1.05) brightness(0.96);
  transform: none;
  animation: none;
}

[data-theme="light"] .ocean-bg-image {
  filter: saturate(1.1) contrast(1.0) brightness(1.18);
  opacity: 0.88;
}

/* リアルタイム海中シミュレーションCanvas（魚群・光芒・上昇気泡・カウスティクス） */
.ocean-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
}

/* 海底の深度感とテキスト可読性を両立するアンバー〜シアン深海ベール */
.ocean-world::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(2, 8, 18, 0.28) 0%,
    rgba(3, 12, 26, 0.06) 35%,
    rgba(1, 6, 15, 0.3) 85%,
    rgba(1, 4, 10, 0.55) 100%
  );
  pointer-events: none;
  z-index: 3;
}

[data-theme="light"] .ocean-world::after {
  background: linear-gradient(
    180deg,
    rgba(240, 248, 255, 0.12) 0%,
    rgba(220, 240, 255, 0.04) 40%,
    rgba(195, 220, 245, 0.25) 100%
  );
  z-index: 3;
}

/* 降り注ぐ海中光芒（サンレイ・ゴッドレイ） */
.ocean-sunrays {
  position: absolute;
  top: -20%;
  left: -20%;
  width: 140%;
  height: 120%;
  background:
    repeating-linear-gradient(
      112deg,
      rgba(220, 250, 255, 0.14) 0px,
      rgba(220, 250, 255, 0.14) 18px,
      transparent 38px,
      rgba(100, 225, 255, 0.08) 65px,
      transparent 95px,
      rgba(240, 255, 255, 0.18) 120px,
      transparent 170px
    );
  mask-image: radial-gradient(ellipse 95% 85% at 45% 0%, black 15%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 95% 85% at 45% 0%, black 15%, transparent 75%);
  mix-blend-mode: screen;
  animation: sunray-shimmer 12s ease-in-out infinite alternate;
  pointer-events: none;
}

@keyframes sunray-shimmer {
  0% {
    opacity: 0.65;
    transform: rotate(0deg) scaleX(1);
  }
  50% {
    opacity: 0.95;
    transform: rotate(1.8deg) scaleX(1.06);
  }
  100% {
    opacity: 0.6;
    transform: rotate(-1.5deg) scaleX(0.97);
  }
}

/* 海底と水面の光の波紋（カウスティクス） */
.ocean-caustics {
  position: absolute;
  inset: -10%;
  background: radial-gradient(
    ellipse at 38% 22%,
    rgba(62, 207, 207, 0.16) 0%,
    rgba(20, 110, 180, 0.09) 40%,
    transparent 72%
  );
  mix-blend-mode: screen;
  filter: blur(40px);
  animation: caustics-pulse 10s ease-in-out infinite alternate;
  pointer-events: none;
}

@keyframes caustics-pulse {
  0% {
    opacity: 0.45;
    transform: scale(1) rotate(0deg);
  }
  50% {
    opacity: 0.85;
    transform: scale(1.08) rotate(2deg);
  }
  100% {
    opacity: 0.5;
    transform: scale(0.96) rotate(-1.5deg);
  }
}

/* アンビエント深海光彩 */
.ocean-ambient-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(95px);
  opacity: 0.5;
  pointer-events: none;
}

.ocean-ambient-glow.glow-1 {
  width: 680px;
  height: 680px;
  background: var(--ambient-1);
  top: -100px;
  left: 8%;
  animation: glow-drift 22s ease-in-out infinite alternate;
}

.ocean-ambient-glow.glow-2 {
  width: 780px;
  height: 780px;
  background: var(--ambient-2);
  bottom: -200px;
  right: 5%;
  animation: glow-drift 28s ease-in-out infinite alternate-reverse;
}

@keyframes glow-drift {
  0% { transform: translate(0, 0); }
  50% { transform: translate(35px, -25px); }
  100% { transform: translate(-20px, 30px); }
}


/* スクロールバー */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 3px;
}

/* ─────────────────────────────
 * 3. ヘッダー（リキッドグラス バー）
 * ───────────────────────────── */

.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 28px;
  background: var(--header-bg);
  backdrop-filter: blur(32px) saturate(2.0);
  -webkit-backdrop-filter: blur(32px) saturate(2.0);
  border-bottom: 1px solid var(--header-border);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.2);
  transition: background 0.3s ease;
}

.app-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* 幾何学的アンカー（いかり）ロゴ */
.brand-anchor {
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
  filter: drop-shadow(0 0 8px var(--accent-cyan-glow));
  flex-shrink: 0;
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.brand-anchor svg {
  width: 24px;
  height: 24px;
}

.brand-anchor:hover {
  transform: rotate(-12deg) scale(1.1);
}

.app-title {
  font-size: 1.18rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  white-space: nowrap;
  color: var(--text-main);
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.app-title sup {
  font-size: 0.62em;
  vertical-align: super;
}

.app-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

/* ── モード切替（iOS セグメントピル） ── */

.mode-switch {
  display: flex;
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 20px;
  padding: 3px;
  gap: 2px;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

[data-theme="light"] .mode-switch {
  background: rgba(0, 40, 80, 0.06);
  border-color: rgba(255, 255, 255, 0.6);
}

.mode-switch__btn {
  appearance: none;
  border: none;
  background: transparent;
  color: var(--text-sub);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 16px;
  cursor: pointer;
  transition: all 0.22s cubic-bezier(0.16, 1, 0.3, 1);
  white-space: nowrap;
}

.mode-switch__btn--active {
  background: var(--glass-btn-bg);
  color: var(--text-main);
  box-shadow: var(--glass-btn-shadow);
  border: 1px solid var(--glass-btn-border);
}

/* ── 全停止ボタン（緊急ストップ） ── */

.btn-stop-all {
  appearance: none;
  border: 1px solid rgba(235, 75, 75, 0.4);
  background: linear-gradient(135deg, rgba(235, 75, 75, 0.22) 0%, rgba(180, 40, 40, 0.12) 100%);
  color: #ff7575;
  font-size: 0.76rem;
  font-weight: 700;
  padding: 6px 14px;
  border-radius: 20px;
  cursor: pointer;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.25), 0 2px 8px rgba(0, 0, 0, 0.2);
  transition: all 0.2s ease;
  white-space: nowrap;
}

.btn-stop-all:hover {
  background: linear-gradient(135deg, rgba(235, 75, 75, 0.35) 0%, rgba(180, 40, 40, 0.25) 100%);
  color: #ffffff;
  box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.4), 0 0 16px rgba(235, 75, 75, 0.35);
  transform: scale(1.02);
}

.btn-stop-all:active {
  transform: scale(0.96);
}

/* ── テーマ切替 ── */

.theme-toggle {
  appearance: none;
  border: 1px solid var(--glass-btn-border);
  background: var(--glass-btn-bg);
  box-shadow: var(--glass-btn-shadow);
  color: var(--text-main);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.theme-toggle:hover {
  background: var(--glass-btn-hover-bg);
  transform: scale(1.06);
}

.theme-toggle:active {
  transform: scale(0.94);
}

.theme-toggle svg {
  width: 17px;
  height: 17px;
}

/* ─────────────────────────────
 * 4. メインコンテナ & グリッド
 * ───────────────────────────── */

.app-main {
  position: relative;
  z-index: 1;
  padding: 24px;
  max-width: 1440px;
  margin: 0 auto;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
  gap: 24px;
  align-items: stretch;
}

/* ─────────────────────────────
 * 5. リキッドグラス カード
 * ───────────────────────────── */

.card {
  position: relative;
  background: var(--glass-card-bg);
  backdrop-filter: var(--glass-card-backdrop);
  -webkit-backdrop-filter: var(--glass-card-backdrop);
  border-top: 1.5px solid rgba(255, 255, 255, 0.45);
  border-left: 1px solid rgba(255, 255, 255, 0.28);
  border-right: 1px solid rgba(255, 255, 255, 0.2);
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 28px;
  padding: 26px 28px 22px;
  min-height: 280px;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--glass-card-shadow);
  cursor: pointer;
  overflow: hidden;
  transition:
    transform 0.25s cubic-bezier(0.16, 1, 0.3, 1),
    border-color 0.25s ease,
    box-shadow 0.3s ease;
  user-select: none;
  -webkit-user-select: none;
  box-sizing: border-box;
}

[data-theme="light"] .card {
  border-top: 1.5px solid rgba(255, 255, 255, 0.95);
  border-left: 1px solid rgba(255, 255, 255, 0.75);
  border-right: 1px solid rgba(255, 255, 255, 0.6);
  border-bottom: 1px solid rgba(0, 40, 80, 0.12);
}

/* ガラス曲面のリキッドスペキュラー反射（液体の表面張力・ガラスの厚み） */
.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 52%;
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.16) 0%,
    rgba(255, 255, 255, 0.04) 45%,
    transparent 100%
  );
  border-radius: 28px 28px 0 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

[data-theme="light"] .card::before {
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.65) 0%,
    rgba(255, 255, 255, 0.15) 50%,
    transparent 100%
  );
}

/* 上端の光沢ハイライトリップ（ガラスエッジの屈折光） */
.card__glass-highlight {
  position: absolute;
  top: 0;
  left: 6%;
  right: 6%;
  height: 1.5px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255, 255, 255, 0.4) 15%,
    rgba(255, 255, 255, 1) 50%,
    rgba(255, 255, 255, 0.4) 85%,
    transparent 100%
  );
  filter: drop-shadow(0 1px 2px rgba(255, 255, 255, 0.7));
  pointer-events: none;
}

.card:hover {
  border-color: var(--glass-card-border-hover);
  border-top-color: rgba(255, 255, 255, 0.85);
  transform: translateY(-3px);
  box-shadow:
    inset 0 1.5px 2.5px 0 rgba(255, 255, 255, 0.75),
    inset 1px 0 1.5px 0 rgba(255, 255, 255, 0.35),
    inset 0 -1.5px 2px 0 rgba(0, 0, 0, 0.4),
    0 28px 65px -8px rgba(0, 4, 16, 0.8),
    0 8px 24px rgba(0, 0, 0, 0.4);
}

.card:hover::before {
  opacity: 1.3;
}

.card:active {
  transform: scale(0.985);
}

/* 再生中の発光（深海バイオルミネセンス & リキッド屈折） */
.card--playing {
  border-color: var(--accent-cyan);
  box-shadow: var(--glass-card-playing-shadow);
  animation: playing-liquid 3.2s ease-in-out infinite alternate;
}

@keyframes playing-liquid {
  0% {
    box-shadow: var(--glass-card-playing-shadow);
  }
  100% {
    box-shadow:
      inset 0 1.5px 3px 0 rgba(255, 255, 255, 0.8),
      inset 0 0 30px rgba(62, 207, 207, 0.28),
      0 28px 72px -6px rgba(0, 4, 16, 0.85),
      0 0 48px rgba(62, 207, 207, 0.42);
  }
}

/* ── カードヘッダー ── */

.card__header {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 2px;
}

.card__title {
  flex: 1;
  min-width: 0;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text-main);
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.6), 0 2px 8px rgba(0, 0, 0, 0.4);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 3px 6px;
  margin: -3px -6px;
  outline: none;
  cursor: inherit;
  text-overflow: ellipsis;
  overflow: hidden;
  white-space: nowrap;
  transition: all 0.2s ease;
  font-family: inherit;
}

[data-theme="light"] .card__title {
  text-shadow: 0 1px 2px rgba(255, 255, 255, 0.8);
}

.card__title.editing {
  cursor: text;
  border-color: var(--accent-cyan);
  background: rgba(0, 0, 0, 0.35);
  user-select: text;
  -webkit-user-select: text;
  box-shadow: 0 0 12px var(--accent-dim);
}

/* 名前編集ペンアイコン（PC・モバイル共通） */
.card__btn--edit {
  width: 26px;
  height: 26px;
  border-radius: 8px;
  border: 1px solid var(--glass-btn-border);
  background: var(--glass-btn-bg);
  box-shadow: var(--glass-btn-shadow);
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.card__btn--edit svg {
  width: 13px;
  height: 13px;
}

.card__btn--edit:hover {
  background: var(--glass-btn-hover-bg);
  color: #ffffff;
  transform: scale(1.08);
  border-color: var(--accent-cyan);
  box-shadow: 0 0 10px var(--accent-cyan-glow);
}

.card__btn--edit:active {
  transform: scale(0.92);
  background: var(--accent-dim);
}

/* 一番右上のフォーマット規格バッジ（MP3 / MP4 等） */
.card__format-badge {
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  padding: 3px 7px;
  border-radius: 6px;
  background: var(--badge-bg);
  border: 1px solid var(--badge-border);
  color: var(--badge-text);
  flex-shrink: 0;
  margin-left: 2px;
  align-self: center;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

/* ── ファイル名 ── */

.card__filename {
  font-size: 0.76rem;
  color: var(--text-sub);
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.85), 0 0 8px rgba(0, 10, 24, 0.7);
  margin-bottom: 22px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  padding: 0 2px;
  font-weight: 500;
}

[data-theme="light"] .card__filename {
  text-shadow: 0 1px 2px rgba(255, 255, 255, 0.8);
}

/* ── コントロール行（リキッドグラス ピル＆オーブ） ── */

.card__controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 24px;
}

/* ボタン共通 */
.card__btn {
  appearance: none;
  border: 1px solid var(--glass-btn-border);
  background: var(--glass-btn-bg);
  box-shadow: var(--glass-btn-shadow);
  color: var(--text-sub);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  flex-shrink: 0;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.card__btn:hover {
  background: var(--glass-btn-hover-bg);
  color: var(--text-main);
  transform: scale(1.05);
}

.card__btn:active {
  transform: scale(0.92);
}

/* 再生オーブ（中央のメインボタン） */
.card__btn--play {
  width: 52px;
  height: 52px;
  border: 1.5px solid var(--orb-border);
  background: var(--orb-bg);
  box-shadow: var(--orb-shadow);
  color: var(--text-main);
}

.card__btn--play svg {
  width: 24px;
  height: 24px;
}

.card--playing .card__btn--play {
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
  box-shadow:
    inset 0 1px 2px rgba(255, 255, 255, 0.6),
    0 0 18px var(--accent-cyan-glow);
}

/* スキップ & ループボタン */
.card__btn--skip,
.card__btn--loop {
  width: 38px;
  height: 38px;
}

.card__btn--skip svg,
.card__btn--loop svg {
  width: 16px;
  height: 16px;
}

.card__btn--loop.active {
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
  background: var(--accent-dim);
  box-shadow: 0 0 12px var(--accent-dim);
}

.skip-label {
  position: absolute;
  font-size: 0.52rem;
  font-weight: 800;
  bottom: 3px;
  right: 5px;
  color: inherit;
  line-height: 1;
  pointer-events: none;
}

/* 削除ボタン */
.card__btn--delete {
  width: 26px;
  height: 26px;
  border-radius: 8px;
  opacity: 0;
  border: none;
  background: transparent;
  box-shadow: none;
  color: var(--text-dim);
}

.card__btn--delete svg {
  width: 14px;
  height: 14px;
}

.card:hover .card__btn--delete,
.card:focus-within .card__btn--delete {
  opacity: 0.7;
}

.card__btn--delete:hover {
  opacity: 1 !important;
  color: #ff6060;
  background: rgba(255, 80, 80, 0.15);
}

@media (hover: none) {
  .card__btn--delete {
    opacity: 0.6;
  }
}

/* ── 音量コントロール ── */

.card__volume {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: 2px;
  background: rgba(0, 14, 32, 0.52);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 20px;
  padding: 4px 10px 4px 6px;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.35);
}

[data-theme="light"] .card__volume {
  background: rgba(255, 255, 255, 0.7);
  border-color: rgba(0, 40, 80, 0.16);
  box-shadow: inset 0 1px 2px rgba(0, 40, 80, 0.06);
}

.card__btn--vol {
  width: 26px;
  height: 26px;
  border: none;
  background: transparent;
  box-shadow: none;
}

.card__btn--vol svg {
  width: 15px;
  height: 15px;
}

.card__btn--vol.muted {
  color: #ff6060;
}

.card__vol-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 52px;
  height: 4px;
  background: var(--seek-track-bg);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

.card__vol-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #ffffff;
  border: 1.5px solid var(--accent-cyan);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.4);
  cursor: pointer;
  transition: transform 0.15s ease;
}

.card__vol-slider::-webkit-slider-thumb:hover {
  transform: scale(1.25);
  box-shadow: 0 0 8px var(--accent-cyan);
}

/* ─────────────────────────────
 * 6. 波形 & シークコンテナ
 * ───────────────────────────── */

.card__seek-container {
  position: relative;
  width: 100%;
  margin-top: auto;
  margin-bottom: 8px;
  cursor: pointer;
  border-radius: 14px;
  padding: 8px 10px 6px;
  background: rgba(0, 14, 30, 0.42);
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.35);
  transition: all 0.2s ease;
}

.card__seek-container:hover {
  background: rgba(0, 18, 40, 0.55);
  border-color: rgba(62, 207, 207, 0.4);
}

[data-theme="light"] .card__seek-container {
  background: rgba(255, 255, 255, 0.62);
  border: 1px solid rgba(0, 40, 80, 0.14);
  box-shadow: inset 0 1px 2px rgba(0, 40, 80, 0.05);
}

[data-theme="light"] .card__seek-container:hover {
  background: rgba(255, 255, 255, 0.82);
  border-color: rgba(26, 138, 138, 0.4);
}

/* 波形キャンバス */
.card__waveform {
  width: 100%;
  height: 40px;
  display: block;
  border-radius: 8px;
  cursor: pointer;
}

/* 重ねるシークバースライダー */
.card__seekbar {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  background: transparent;
  cursor: pointer;
  outline: none;
  margin-top: 4px;
  --progress: 0%;
}

.card__seekbar::-webkit-slider-runnable-track {
  height: 4px;
  border-radius: 2px;
  background: linear-gradient(
    to right,
    var(--accent-cyan) 0%,
    var(--accent-cyan) var(--progress),
    var(--seek-track-bg) var(--progress),
    var(--seek-track-bg) 100%
  );
}

.card__seekbar::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #ffffff;
  border: 2px solid var(--accent-cyan);
  margin-top: -5px;
  box-shadow: 0 0 8px var(--accent-cyan-glow);
  transition: transform 0.15s ease;
}

.card__seekbar::-webkit-slider-thumb:hover,
.card__seekbar:active::-webkit-slider-thumb {
  transform: scale(1.35);
  box-shadow: 0 0 14px var(--accent-cyan);
}

.card__seekbar::-moz-range-track {
  height: 4px;
  border-radius: 2px;
  background: var(--seek-track-bg);
}

.card__seekbar::-moz-range-progress {
  height: 4px;
  border-radius: 2px;
  background: var(--accent-cyan);
}

.card__seekbar::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #ffffff;
  border: 2px solid var(--accent-cyan);
  box-shadow: 0 0 8px var(--accent-cyan-glow);
}

/* ─────────────────────────────
 * 7. 時間表示
 * ───────────────────────────── */

.card__time {
  display: flex;
  justify-content: space-between;
  padding: 0 4px;
  font-size: 0.74rem;
  color: var(--text-sub);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
  font-weight: 600;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.85);
}

[data-theme="light"] .card__time {
  text-shadow: 0 1px 2px rgba(255, 255, 255, 0.8);
}

/* ─────────────────────────────
 * 8. 追加カード（リキッドフロスト）
 * ───────────────────────────── */

.card--add {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 280px;
  height: 100%;
  border-radius: 28px;
  padding: 26px 28px 22px;
  background: linear-gradient(
    165deg,
    rgba(255, 255, 255, 0.12) 0%,
    rgba(14, 38, 64, 0.42) 50%,
    rgba(6, 20, 38, 0.68) 100%
  );
  border: 1.5px dashed rgba(255, 255, 255, 0.38);
  box-shadow: inset 0 1px 2px rgba(255, 255, 255, 0.3), 0 16px 36px -8px rgba(0, 4, 16, 0.5);
  backdrop-filter: blur(28px) saturate(180%);
  -webkit-backdrop-filter: blur(28px) saturate(180%);
  cursor: pointer;
  overflow: hidden;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  box-sizing: border-box;
}

[data-theme="light"] .card--add {
  background: linear-gradient(
    165deg,
    rgba(255, 255, 255, 0.85) 0%,
    rgba(235, 245, 255, 0.6) 50%,
    rgba(215, 235, 250, 0.75) 100%
  );
  border-color: rgba(0, 40, 80, 0.25);
  box-shadow: inset 0 1px 2px rgba(255, 255, 255, 0.8), 0 16px 36px -8px rgba(0, 40, 80, 0.08);
}

.card--add:hover {
  border-color: var(--accent-cyan);
  background: var(--accent-dim);
  box-shadow: 0 8px 30px var(--accent-dim);
  transform: translateY(-2px);
}

.card--add:active {
  transform: scale(0.98);
}

.card--add__content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  color: var(--text-sub);
  pointer-events: none;
  transition: color 0.25s ease;
}

.card--add:hover .card--add__content {
  color: var(--text-main);
}

.card--add__icon-wrapper {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--glass-btn-bg);
  border: 1px solid var(--glass-btn-border);
  box-shadow: var(--glass-btn-shadow);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.25s ease;
}

.card--add:hover .card--add__icon-wrapper {
  background: var(--accent-cyan);
  color: #071220;
  box-shadow: 0 0 20px var(--accent-cyan-glow);
  transform: scale(1.1);
}

.card--add__content svg {
  width: 28px;
  height: 28px;
  stroke-width: 2;
}

.card--add__content span {
  font-size: 0.95rem;
  font-weight: 700;
}

.card--add__content small {
  font-size: 0.72rem;
  color: var(--text-dim);
}

/* ─────────────────────────────
 * 9. 空状態（Empty State）
 * ───────────────────────────── */

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 90px 24px;
  gap: 16px;
}

.empty-state__orb {
  position: relative;
  width: 140px;
  height: 140px;
  margin-bottom: 8px;
}

.empty-state__waves {
  position: absolute;
  inset: 0;
}

.empty-state__wave {
  position: absolute;
  inset: 0;
  border: 1.5px solid var(--accent-cyan);
  border-radius: 50%;
  opacity: 0;
  animation: wave-ripple 4.5s ease-out infinite;
}

.empty-state__wave:nth-child(2) { animation-delay: 1.5s; }
.empty-state__wave:nth-child(3) { animation-delay: 3s; }

@keyframes wave-ripple {
  0% { transform: scale(0.3); opacity: 0.6; }
  100% { transform: scale(1.3); opacity: 0; }
}

.empty-state__glow {
  position: absolute;
  inset: 30px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--accent-cyan-glow) 0%, transparent 70%);
  filter: blur(10px);
}

.empty-state__title {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--text-main);
}

.empty-state__title sup {
  font-size: 0.6em;
  vertical-align: super;
}

.empty-state__subtitle {
  font-size: 0.88rem;
  color: var(--text-sub);
  max-width: 360px;
  line-height: 1.6;
}

.empty-state__btn {
  appearance: none;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 28px;
  margin-top: 10px;
  border: 1px solid var(--accent-cyan);
  background: var(--accent-dim);
  color: var(--accent-cyan);
  font-size: 0.94rem;
  font-weight: 700;
  border-radius: 24px;
  cursor: pointer;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.3), 0 8px 24px var(--accent-dim);
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  font-family: inherit;
}

.empty-state__btn svg {
  width: 20px;
  height: 20px;
}

.empty-state__btn:hover {
  background: var(--accent-cyan);
  color: #071220;
  box-shadow: 0 0 28px var(--accent-cyan-glow);
  transform: translateY(-2px);
}

.empty-state__btn:active {
  transform: scale(0.96);
}

/* ─────────────────────────────
 * 10. 非表示ファイル入力
 * ───────────────────────────── */

.file-input-hidden {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
  opacity: 0;
  pointer-events: none;
}

/* ─────────────────────────────
 * 11. アニメーション
 * ───────────────────────────── */

@keyframes card-enter {
  from {
    opacity: 0;
    transform: translateY(16px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.card-enter {
  animation: card-enter 0.38s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

/* ─────────────────────────────
 * 12. レスポンシブ
 * ───────────────────────────── */

@media (max-width: 480px) {
  .app-header {
    flex-wrap: wrap;
    gap: 10px;
    padding: 12px 16px;
  }

  .app-brand {
    flex-basis: 100%;
  }

  .app-controls {
    width: 100%;
    justify-content: space-between;
  }

  .app-main {
    padding: 14px;
  }

  .card-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .card {
    padding: 22px 20px 18px;
    min-height: 270px;
  }

  .empty-state {
    padding: 60px 16px;
  }
}

@media (min-width: 481px) and (max-width: 768px) {
  .card-grid {
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 18px;
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .card-grid {
    grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
    gap: 22px;
  }
}

@media (min-width: 1025px) {
  .card-grid {
    grid-template-columns: repeat(auto-fill, minmax(400px, 1fr));
    gap: 26px;
  }

  .app-main {
    padding: 32px 40px;
  }
}

/* ─────────────────────────────
 * 13. ノッチ / セーフエリア対応
 * ───────────────────────────── */

@supports (padding: env(safe-area-inset-top)) {
  .app-header {
    padding-top: calc(14px + env(safe-area-inset-top));
    padding-left: calc(24px + env(safe-area-inset-left));
    padding-right: calc(24px + env(safe-area-inset-right));
  }

  .app-main {
    padding-left: calc(24px + env(safe-area-inset-left));
    padding-right: calc(24px + env(safe-area-inset-right));
    padding-bottom: calc(24px + env(safe-area-inset-bottom));
  }
}