/* ============================================
   Love Letters - 粉色百封情书样式
   ============================================ */

/* 容器与头部 */
.love-letters-header {
  text-align: center;
  margin: 2rem 0 3rem;
  position: relative;
}

.love-letters-header h1 {
  font-size: 2.2rem;
  font-weight: 700;
  color: #ff69b4;
  background: linear-gradient(135deg, #ff69b4 0%, #ff1493 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.5rem;
  display: inline-block;
  position: relative;
}

.love-letters-header p {
  color: #ffb6c1;
  font-size: 1.1rem;
  letter-spacing: 2px;
}

/* 飘落的爱心动画 */
@keyframes floatingHeart {
  0% { transform: translateY(0) rotate(-15deg); opacity: 0; }
  50% { opacity: 0.8; }
  100% { transform: translateY(-80px) rotate(15deg) scale(1.2); opacity: 0; }
}

.floating-heart {
  position: absolute;
  color: #ffb6c1;
  font-size: 1.2rem;
  animation: floatingHeart 4s ease-in-out infinite;
  pointer-events: none;
}

/* 信封网格系统 */
.love-letters-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 30px;
  padding: 1rem;
  max-width: 1000px;
  margin: 0 auto;
}

/* -------------------------------------
   信封卡片样式
   ------------------------------------- */
.envelope-card {
  position: relative;
  height: 180px;
  background: #fff0f5;
  border-radius: 12px;
  box-shadow: 0 10px 20px rgba(255, 182, 193, 0.2), 0 0 0 1px rgba(255, 182, 193, 0.4);
  cursor: pointer;
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  overflow: hidden;
}

.envelope-card:hover {
  transform: translateY(-10px) scale(1.02);
  box-shadow: 0 20px 30px rgba(255, 105, 180, 0.25), 0 0 0 2px rgba(255, 105, 180, 0.5);
  background: #fff9fb;
}

/* 信封折页效果 (上部三角形) */
.envelope-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 60%;
  background: linear-gradient(to bottom, rgba(255,182,193,0.3) 0%, rgba(255,182,193,0) 100%);
  clip-path: polygon(0 0, 50% 100%, 100% 0);
  transition: all 0.4s ease;
  z-index: 1;
}

.envelope-card:hover::before {
  transform: scaleY(0.9) translateY(-5%);
}

/* 信封封口贴纸 (小爱心) */
.envelope-seal {
  position: absolute;
  top: 45%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 32px;
  height: 32px;
  background: #ff69b4;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  color: white;
  font-size: 14px;
  box-shadow: 0 3px 10px rgba(255, 105, 180, 0.4);
  z-index: 2;
  transition: all 0.4s ease;
}

.envelope-card:hover .envelope-seal {
  transform: translate(-50%, -60%) scale(1.1);
  box-shadow: 0 5px 15px rgba(255, 20, 147, 0.5);
}

/* 卡片文字内容 */
.envelope-content {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  padding: 1.5rem 1rem;
  text-align: center;
  z-index: 3;
  transition: transform 0.3s ease;
}

.envelope-card:hover .envelope-content {
  transform: translateY(-5px);
}

.envelope-title {
  color: #ff1493;
  font-weight: 700;
  font-size: 1.1rem;
  margin-bottom: 5px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.envelope-date {
  color: #ff69b4;
  font-size: 0.85rem;
  opacity: 0.8;
}

/* 有音频提示角标 */
.has-audio-badge {
  position: absolute;
  top: 10px;
  right: 10px;
  background: rgba(255, 20, 147, 0.1);
  color: #ff1493;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 12px;
  z-index: 4;
}

/* 新信件入场动画 */
@keyframes letterFadeIn {
  from { opacity: 0; transform: translateY(30px) scale(0.9); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.envelope-card {
  animation: letterFadeIn 0.6s ease backwards;
}

/* -------------------------------------
   详情弹窗 Modal
   ------------------------------------- */
.letter-modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(255, 240, 245, 0.85); /* 半透明粉白 */
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 99990;
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 0;
  visibility: hidden;
  transition: all 0.4s ease;
}

.letter-modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.letter-modal-container {
  background: #fff;
  width: 90%;
  max-width: 600px;
  max-height: 85vh;
  border-radius: 20px;
  box-shadow: 0 25px 50px rgba(255, 105, 180, 0.15), 0 0 0 1px rgba(255, 182, 193, 0.3);
  position: relative;
  display: flex;
  flex-direction: column;
  transform: scale(0.9) translateY(20px);
  opacity: 0;
  transition: all 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  overflow: hidden;
}

/* 信纸纹理背景 */
.letter-modal-container::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: repeating-linear-gradient(transparent, transparent 31px, rgba(255, 182, 193, 0.2) 31px, rgba(255, 182, 193, 0.2) 32px);
  pointer-events: none;
  z-index: 0;
}

.letter-modal-overlay.active .letter-modal-container {
  transform: scale(1) translateY(0);
  opacity: 1;
}

/* 关闭按钮 */
.modal-close-btn {
  position: absolute;
  top: 15px;
  right: 15px;
  background: #fff0f5;
  border: none;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  color: #ff69b4;
  font-size: 20px;
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 10;
  transition: all 0.3s ease;
}

.modal-close-btn:hover {
  background: #ffb6c1;
  color: #fff;
  transform: rotate(90deg);
}

.modal-header {
  padding: 2.5rem 2rem 1.5rem;
  text-align: center;
  position: relative;
  z-index: 1;
}

.modal-title {
  color: #ff1493;
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.modal-date {
  color: #ff69b4;
  font-size: 0.9rem;
  opacity: 0.8;
}

.modal-content-scroll {
  padding: 0 2rem 2rem;
  overflow-y: auto;
  flex-grow: 1;
  position: relative;
  z-index: 1;
}

.letter-text {
  color: #444;
  line-height: 1.8;
  font-size: 1.05rem;
  white-space: pre-wrap;
  word-wrap: break-word;
}

.letter-text p {
  margin: 0.2em 0;
}

/* 自定义滚动条 */
.modal-content-scroll::-webkit-scrollbar {
  width: 6px;
}
.modal-content-scroll::-webkit-scrollbar-track {
  background: rgba(255, 182, 193, 0.1); 
  border-radius: 3px;
}
.modal-content-scroll::-webkit-scrollbar-thumb {
  background: rgba(255, 182, 193, 0.6); 
  border-radius: 3px;
}

/* -------------------------------------
   音频播放器面板 (卡片底部)
   ------------------------------------- */
.audio-player-wrapper {
  margin-top: 2rem;
  padding: 1.2rem;
  background: linear-gradient(135deg, #fff5f8 0%, #fff 100%);
  border-radius: 16px;
  border: 1px solid rgba(255, 182, 193, 0.4);
  box-shadow: 0 8px 20px rgba(255, 182, 193, 0.15);
  display: flex;
  align-items: center;
  gap: 15px;
}

.play-pause-btn {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: linear-gradient(135deg, #ff69b4 0%, #ff1493 100%);
  border: none;
  color: white;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  box-shadow: 0 4px 10px rgba(255, 20, 147, 0.3);
  transition: all 0.3s ease;
  font-size: 18px;
  flex-shrink: 0;
  position: relative;
}

.play-pause-btn:hover {
  transform: scale(1.05);
  box-shadow: 0 6px 15px rgba(255, 20, 147, 0.4);
}

.play-pause-btn:active {
  transform: scale(0.95);
}

/* 播放时的唱片旋转动画 */
.play-pause-btn.playing {
  animation: discSpin 4s linear infinite;
}

@keyframes discSpin {
  100% { transform: rotate(360deg); }
}

.audio-controls {
  flex-grow: 1;
}

.progress-container {
  height: 8px;
  background: #ffe4ec;
  border-radius: 4px;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  margin-bottom: 8px;
}

.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, #ffb6c1 0%, #ff1493 100%);
  border-radius: 4px;
  width: 0%;
  transition: width 0.1s linear;
  position: relative;
}

.progress-bar::after {
  content: '';
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 8px;
  height: 8px;
  background: #fff;
  border-radius: 50%;
  box-shadow: 0 0 4px rgba(0,0,0,0.2);
}

.time-display {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  color: #ff69b4;
  font-family: monospace;
}

/* 为了兼容黑暗模式 */
html[data-mode="dark"] .love-letters-header h1 {
  background: linear-gradient(135deg, #ff8da1 0%, #ff69b4 100%);
  -webkit-background-clip: text;
}

html[data-mode="dark"] .envelope-card {
  background: #2a1f26;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2), 0 0 0 1px rgba(255, 105, 180, 0.2);
}

html[data-mode="dark"] .envelope-card:hover {
  background: #33242e;
  box-shadow: 0 20px 30px rgba(0, 0, 0, 0.3), 0 0 0 2px rgba(255, 105, 180, 0.4);
}

html[data-mode="dark"] .envelope-card::before {
  background: linear-gradient(to bottom, rgba(255,105,180,0.15) 0%, rgba(255,105,180,0) 100%);
}

html[data-mode="dark"] .envelope-title {
  color: #ff8da1;
}

html[data-mode="dark"] .letter-modal-overlay {
  background: rgba(30, 20, 25, 0.9);
}

html[data-mode="dark"] .letter-modal-container {
  background: #2a1f26;
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(255, 105, 180, 0.2);
}

html[data-mode="dark"] .letter-modal-container::before {
  background-image: repeating-linear-gradient(transparent, transparent 31px, rgba(255, 105, 180, 0.1) 31px, rgba(255, 105, 180, 0.1) 32px);
}

html[data-mode="dark"] .modal-close-btn {
  background: #3d2a35;
}

html[data-mode="dark"] .modal-close-btn:hover {
  background: #ff69b4;
}

html[data-mode="dark"] .letter-text {
  color: #ddd;
}

html[data-mode="dark"] .audio-player-wrapper {
  background: linear-gradient(135deg, #33242e 0%, #2a1f26 100%);
  border-color: rgba(255, 105, 180, 0.2);
}

html[data-mode="dark"] .progress-container {
  background: #4a3340;
}

/* -------------------------------------
   信件照片样式（弹窗内）
   ------------------------------------- */
.letter-photo {
  margin: 0 0 1rem;
  border-radius: 12px;
  overflow: hidden;
  cursor: zoom-in;
  position: relative;
  box-shadow: 0 4px 15px rgba(255, 182, 193, 0.3);
  transition: transform 0.3s ease;
}

.letter-photo:hover {
  transform: scale(1.01);
}

.letter-photo::after {
  content: '🔍 点击查看大图';
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(255, 105, 180, 0.75);
  color: #fff;
  font-size: 0.7rem;
  padding: 3px 10px;
  border-radius: 12px;
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}

.letter-photo:hover::after {
  opacity: 1;
}

.letter-photo img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 12px;
}

/* -------------------------------------
   移动端 & 微信浏览器兼容
   ------------------------------------- */

/* 微信浏览器不支持 backdrop-filter，提供 fallback */
@supports not ((-webkit-backdrop-filter: blur(8px)) or (backdrop-filter: blur(8px))) {
  .letter-modal-overlay {
    background: rgba(255, 240, 245, 0.95);
  }
}

/* 手机端适配 */
@media (max-width: 768px) {
  .love-letters-header {
    margin: 1rem 0 1.5rem;
  }

  .love-letters-header h1 {
    font-size: 1.6rem;
  }

  .love-letters-header p {
    font-size: 0.9rem;
  }

  .love-letters-grid {
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 16px;
    padding: 0.5rem;
  }

  .envelope-card {
    height: 140px;
  }

  .envelope-title {
    font-size: 0.9rem;
  }

  .envelope-date {
    font-size: 0.75rem;
  }

  .envelope-seal {
    width: 26px;
    height: 26px;
    font-size: 12px;
  }

  /* 弹窗适配手机 */
  .letter-modal-container {
    width: 95%;
    max-height: 90vh; /* 用 90vh 而非 100vh，避免微信底部工具栏遮挡 */
    max-height: 90dvh; /* 动态视口高度，现代浏览器 */
    border-radius: 16px;
  }

  .modal-header {
    padding: 1.5rem 1.2rem 1rem;
  }

  .modal-title {
    font-size: 1.3rem;
  }

  .modal-content-scroll {
    padding: 0 1.2rem 1.5rem;
  }

  .letter-text {
    font-size: 0.95rem;
    line-height: 1.7;
  }

  /* 音频播放器手机端 */
  .audio-player-wrapper {
    margin-top: 1rem;
    margin-bottom: 0.5rem;
    padding: 0.8rem;
    gap: 10px;
  }

  .play-pause-btn {
    width: 42px;
    height: 42px;
    font-size: 16px;
  }

  .modal-close-btn {
    width: 32px;
    height: 32px;
    font-size: 18px;
    top: 10px;
    right: 10px;
  }

  /* 手机不显示 hover 提示 */
  .letter-photo::after {
    display: none;
  }

  /* 手机上卡片不需要 hover 效果，用 active 替代 */
  .envelope-card:hover {
    transform: none;
    box-shadow: 0 10px 20px rgba(255, 182, 193, 0.2), 0 0 0 1px rgba(255, 182, 193, 0.4);
  }

  .envelope-card:active {
    transform: scale(0.97);
    transition: transform 0.1s ease;
  }
}

/* 超小屏幕（iPhone SE 等） */
@media (max-width: 375px) {
  .love-letters-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .envelope-card {
    height: 120px;
  }

  .modal-title {
    font-size: 1.1rem;
  }

  .letter-text {
    font-size: 0.9rem;
  }
}