/* ===== “静谧之夜” 主题核心配色 ===== */
:root {
  --bg-main: #1a202c;         /* 主背景色：深木炭色 */
  --bg-card: #2d3748;         /* 卡片背景色：深灰色 */
  --text-primary: #e2e8f0;    /* 主要文字颜色：柔和的白色 */
  --text-secondary: #a0aec0;   /* 次要文字颜色：中灰色 */
  --border-color: #4a5568;     /* 边框/分割线颜色：亮灰色 */
  --accent-blue: #5a95f5;       /* 主题强调色：柔和的天空蓝 */
  --accent-blue-darker: #4a80f0;/* 主题色悬停加深 */
  --hover-bg: #4a5568;          /* 悬停背景色 */
}

/* 全局样式 */
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg-main);
  margin: 0;
  padding: 1rem;
  color: var(--text-primary);
  box-sizing: border-box;
}

/* 头部样式 */
header {
  background: var(--bg-card);
  padding: 1rem;
  text-align: center;
  border-radius: 12px;
  margin: 0 auto 1rem auto;
  max-width: 800px;
  border: 1px solid var(--border-color);
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

h1 {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.75rem;
  margin: 0;
}

.music-icon { font-size: 2.2rem; color: var(--accent-blue); }
.title-text { font-size: 1.8rem; font-weight: 600; color: var(--text-primary); }

/* 主内容区 */
main {
  padding: 0;
  max-width: 800px;
  margin: 0 auto;
}

/* 卡片样式 */
.card {
  background: var(--bg-card);
  padding: 1.5rem;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  margin-bottom: 1rem;
  transition: all 0.3s ease-out;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}
.card:hover {
  border-color: #556378;
  transform: translateY(-2px);
}


/* 歌曲信息 */
#song-title { font-size: 1.5rem; margin: 0 0 0.25rem 0; font-weight: 600; text-align: center; color: var(--text-primary); }
.song-tags { color: var(--text-secondary); font-size: 0.9em; margin: 0.25em 0 1.5em 0; text-align: center; }

/* 音频控件 (隐藏原生) */
audio { display: none; }


/* 基础按钮样式 (用于睡眠面板等) */
button {
  padding: 0.5rem 1rem;
  margin: 0.25rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: #384356;
  color: var(--text-primary);
  cursor: pointer;
  transition: background 0.2s;
}
button:hover { background: var(--hover-bg); }

/* 相关歌曲区域 */
.related { margin-top: 1.5rem; }
.related-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}
.related-header h3 { margin: 0; font-size: 1rem; font-weight: 600; color: var(--text-primary); }
.related-song { padding: 0.75rem; border-radius: 8px; margin-bottom: 0.5rem; cursor: pointer; transition: background 0.2s, color 0.2s; }
.related-song:hover { 
  background: var(--hover-bg); 
  color: #fff;
}
.related-song .song-tags { display: inline; margin-left: 0.5em; color: var(--text-secondary); font-size: 0.9em; }
.related-song:hover .song-tags { color: var(--text-secondary); }


/* 搜索框样式 */
.search-box input { 
  width: 100%; 
  padding: 0.75rem; 
  font-size: 1rem; 
  border: 1px solid var(--border-color); 
  border-radius: 8px; 
  box-sizing: border-box;
  background-color: var(--bg-main);
  color: var(--text-primary);
}
.search-results { margin-top: 0.5rem; }
.search-result-item { padding: 0.75rem; border-radius: 6px; margin-bottom: 0.25rem; cursor: pointer; transition: background 0.2s; }
.search-result-item:hover { background: var(--hover-bg); color: #fff; }
.search-result-item .song-tags { display: inline; margin-left: 0.5em; color: var(--text-secondary); font-size: 0.9em; }

/* 控制区美学升级 */
.controls { display: flex; justify-content: center; align-items: center; margin-top: 1rem; }
.main-controls { display: flex; justify-content: center; align-items: center; gap: 1.5rem; }

.control-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 1rem;
  cursor: pointer;
  padding: 0;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.25s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
.control-btn:hover { 
  border-color: #6a788d;
  color: var(--text-primary);
  transform: scale(1.08) translateY(-2px);
}

.play-btn {
  font-size: 1.5rem;
  width: 64px;
  height: 64px;
  background-color: var(--accent-blue);
  color: white;
  border: none;
  box-shadow: 0 4px 20px rgba(90, 149, 245, 0.4);
}
.play-btn .fa-play { padding-left: 4px; }
.play-btn:hover { 
    background-color: var(--accent-blue-darker);
    box-shadow: 0 6px 24px rgba(90, 149, 245, 0.5);
}

/* 自定义进度条和时间显示样式 */
.progress-container { background: #1f2736; border-radius: 5px; cursor: pointer; margin: 1rem 0 0.5rem 0; height: 8px; width: 100%; }
.progress-bar { background: var(--accent-blue); border-radius: 5px; height: 100%; width: 0%; transition: width 0.1s linear; }
.time-display { font-size: 0.85rem; color: var(--text-secondary); text-align: right; margin-bottom: 0.5rem; }

/* 睡眠控制面板 */
#sleep-control-card { padding: 1rem 1.5rem; }
.sleep-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.sleep-card-header h4 {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
  display: flex;
  align-items: center;
}
.control-icon { cursor: pointer; color: var(--text-secondary); transition: color 0.2s; font-size: 1.2rem; }
.control-icon:hover { color: var(--text-primary); }
#sleep-panel { margin-top: 1rem; }
#sleep-panel label { font-weight: 600; font-size: 0.9rem; }
.tag-buttons { display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 0.5rem 0; }
#sleep-panel select {
  width: 100%;
  padding: 0.4rem;
  border-radius: 6px;
  margin-top: 0.25rem;
  background-color: #384356;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
}
.tag-buttons .tag-btn.selected { background: var(--accent-blue); color: white; border-color: var(--accent-blue); }

/* 音量控制样式 */
.volume-control { position: relative; }
.volume-slider-container {
  position: absolute;
  bottom: 150%;
  right: -10px; 
  left: auto;
  transform: translateX(0); 
  background-color: rgba(45, 55, 72, 0.95);
  backdrop-filter: blur(5px);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 1rem 0.5rem;
  display: none;
  opacity: 0;
  transition: opacity 0.2s ease-in-out, bottom 0.2s ease-in-out;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}
.volume-slider-container.show { display: block; opacity: 1; bottom: 160%; }
.volume-slider {
  writing-mode: bt-lr;
  -webkit-appearance: slider-vertical;
  width: 8px;
  height: 100px;
  padding: 0 5px;
}

/* ========================================================== */
/* 欢迎弹窗样式 */
/* ========================================================== */

#welcome-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.7);
  z-index: 1000;
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 1;
  transition: opacity 0.3s ease-in-out;
}

#welcome-modal {
  background-color: var(--bg-card);
  padding: 2rem;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  text-align: center;
  max-width: 90%;
  width: 400px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.2);
  transform: scale(1);
  transition: transform 0.3s ease-in-out;
}

#welcome-modal h3 {
  margin-top: 0;
  color: var(--text-primary);
  font-size: 1.5rem;
}

#welcome-modal p {
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

#welcome-agree-btn {
  background-color: var(--accent-blue);
  color: white;
  border: none;
  padding: 0.8rem 1.5rem;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  width: 100%;
}

#welcome-agree-btn:hover {
  background-color: var(--accent-blue-darker);
  transform: scale(1.02);
}

/* ========================================================== */
/* 修复：使用ID + 类的组合，提高“隐藏”指令的优先级 */
/* ========================================================== */
#welcome-overlay.hidden {
  opacity: 0;
  pointer-events: none; /* 让元素在隐藏时不可点击 */
}

#welcome-overlay.hidden #welcome-modal {
  transform: scale(0.9);
}