/* ═══════════════════════════════════════════════════════════
 * GCC AUDIO TOGGLE BUTTON
 *
 * Nút loa nổi top-right card preview/card view.
 * Click để play/pause audio. Sóng động khi đang phát.
 *
 * Áp dụng cho:
 *  - Preview Form: .gcc-col--preview .gcc-preview-card
 *  - Card View:    .gcc-view-standalone .gcc-preview-card
 *                  main.gcc-preview-card
 *
 * Cấu trúc HTML cần có:
 *  <button class="gcc-audio-toggle" data-state="idle|playing">
 *    <svg class="gcc-audio-toggle__icon">
 *      <path class="gcc-audio-toggle__speaker" .../>     // thân loa
 *      <path class="gcc-audio-toggle__wave gcc-audio-toggle__wave--1" .../>  // sóng nhỏ
 *      <path class="gcc-audio-toggle__wave gcc-audio-toggle__wave--2" .../>  // sóng vừa
 *      <path class="gcc-audio-toggle__wave gcc-audio-toggle__wave--3" .../>  // sóng lớn
 *    </svg>
 *  </button>
 *  <audio class="gcc-audio-hidden" preload="metadata"></audio>
 * ═══════════════════════════════════════════════════════════ */

/* ───── Container card phải là positioning context ───── */
.gcc-preview-card {
  position: relative;
}

/* ───── Audio element ẩn (không native controls) ───── */
.gcc-audio-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
  overflow: hidden;
}

/* ───── Nút toggle ───── */
.gcc-audio-toggle {
  position: absolute;
  top: 12px;
  right: 12px;
  z-index: 5;

  width: 44px;
  height: 44px;
  padding: 0;
  margin: 0;
  border: none;

  display: inline-flex;
  align-items: center;
  justify-content: center;

  /* Trong suốt — chỉ giữ icon */
  background: transparent;
  box-shadow: none;

  cursor: pointer;
  transition: transform 0.2s ease;
  -webkit-tap-highlight-color: transparent;
}

.gcc-audio-toggle:hover {
  background: transparent;
  transform: scale(1.1);
}

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

.gcc-audio-toggle:focus-visible {
  outline: 2px solid #4f8cff;
  outline-offset: 2px;
  border-radius: 4px;
}

/* Ẩn nút khi không có audio (JS sẽ add class này) */
.gcc-audio-toggle[hidden],
.gcc-audio-toggle.is-empty {
  display: none !important;
}

/* ───── Icon SVG (lớn gấp 2 so với bản nền) ───── */
.gcc-audio-toggle__icon {
  width: 44px;
  height: 44px;
  display: block;
  color: #ffffff;
  /* Drop-shadow để icon vẫn đọc được trên nền sáng (ảnh trắng) */
  filter: drop-shadow(0 1px 3px rgba(0, 0, 0, 0.55))
          drop-shadow(0 0 1px rgba(0, 0, 0, 0.4));
  overflow: visible;
}

.gcc-audio-toggle__speaker {
  fill: currentColor;
}

.gcc-audio-toggle__wave {
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;

  /* Origin scale nằm gần thân loa để sóng "thở" tự nhiên */
  transform-origin: 6px 12px;
  transform-box: fill-box;

  /* Trạng thái idle: sóng tĩnh, opacity giảm dần theo độ xa */
  opacity: 0.85;
}

.gcc-audio-toggle__wave--1 { opacity: 0.9; }
.gcc-audio-toggle__wave--2 { opacity: 0.7; }
.gcc-audio-toggle__wave--3 { opacity: 0.5; }

/* ───── Khi đang phát: sóng "thở" lệch pha ───── */
.gcc-audio-toggle[data-state="playing"] .gcc-audio-toggle__wave {
  animation: gccAudioWave 1.4s ease-in-out infinite;
}

.gcc-audio-toggle[data-state="playing"] .gcc-audio-toggle__wave--1 {
  animation-delay: 0s;
}

.gcc-audio-toggle[data-state="playing"] .gcc-audio-toggle__wave--2 {
  animation-delay: 0.18s;
}

.gcc-audio-toggle[data-state="playing"] .gcc-audio-toggle__wave--3 {
  animation-delay: 0.36s;
}

@keyframes gccAudioWave {
  0%, 100% {
    opacity: 0.3;
    transform: scale(0.85);
  }
  50% {
    opacity: 1;
    transform: scale(1.08);
  }
}

/* Khi đang play: thêm glow nhẹ quanh icon (thay cho pulse ring vì không có nền) */
.gcc-audio-toggle[data-state="playing"] .gcc-audio-toggle__icon {
  filter: drop-shadow(0 1px 3px rgba(0, 0, 0, 0.55))
          drop-shadow(0 0 1px rgba(0, 0, 0, 0.4))
          drop-shadow(0 0 6px rgba(79, 140, 255, 0.7));
  animation: gccAudioGlow 1.6s ease-in-out infinite;
}

@keyframes gccAudioGlow {
  0%, 100% {
    filter: drop-shadow(0 1px 3px rgba(0, 0, 0, 0.55))
            drop-shadow(0 0 1px rgba(0, 0, 0, 0.4))
            drop-shadow(0 0 4px rgba(79, 140, 255, 0.5));
  }
  50% {
    filter: drop-shadow(0 1px 3px rgba(0, 0, 0, 0.55))
            drop-shadow(0 0 1px rgba(0, 0, 0, 0.4))
            drop-shadow(0 0 10px rgba(79, 140, 255, 0.85));
  }
}

/* Reduced motion — tôn trọng người dùng tắt animation */
@media (prefers-reduced-motion: reduce) {
  .gcc-audio-toggle[data-state="playing"] .gcc-audio-toggle__wave {
    animation: none;
    opacity: 1;
  }
  .gcc-audio-toggle[data-state="playing"] .gcc-audio-toggle__icon {
    animation: none;
  }
  .gcc-audio-toggle,
  .gcc-audio-toggle:hover {
    transition: none;
    transform: none;
  }
}

/* ───── Mobile: icon nhỏ hơn chút ───── */
@media (max-width: 480px) {
  .gcc-audio-toggle {
    width: 40px;
    height: 40px;
    top: 10px;
    right: 10px;
  }
  .gcc-audio-toggle__icon {
    width: 40px;
    height: 40px;
  }
}

/* ───── Standalone view (Card View): icon lớn hơn vì card rộng hơn ───── */
.gcc-view-standalone .gcc-audio-toggle,
.gcc-wedding-view   .gcc-audio-toggle {
  top: 16px;
  right: 16px;
  width: 52px;
  height: 52px;
}

.gcc-view-standalone .gcc-audio-toggle__icon,
.gcc-wedding-view   .gcc-audio-toggle__icon {
  width: 52px;
  height: 52px;
}

@media (max-width: 480px) {
  .gcc-view-standalone .gcc-audio-toggle,
  .gcc-wedding-view   .gcc-audio-toggle {
    top: 12px;
    right: 12px;
    width: 44px;
    height: 44px;
  }
  .gcc-view-standalone .gcc-audio-toggle__icon,
  .gcc-wedding-view   .gcc-audio-toggle__icon {
    width: 44px;
    height: 44px;
  }
}

/* ═══════════════════════════════════════════════════════════
 * END GCC AUDIO TOGGLE BUTTON
 * ═══════════════════════════════════════════════════════════ */