/**
 * 汽水音乐主题 - 顶级音乐站UI风格
 * 参考：Spotify, Apple Music, YouTube Music
 * 特色：渐变、毛玻璃、动态效果、音乐感
 */

/* ==========================================================================
   音乐主题色彩系统
   ========================================================================== */

:root {
  /* 主题渐变色 - 充满活力的音乐感 */
  --music-gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --music-gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --music-gradient-accent: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  --music-gradient-warm: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
  --music-gradient-cool: linear-gradient(135deg, #30cfd0 0%, #330867 100%);
  --music-gradient-dark: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
  
  /* 音乐品牌色 */
  --music-primary: #667eea;
  --music-primary-light: #8b9ef7;
  --music-primary-dark: #4d5eb8;
  --music-secondary: #764ba2;
  --music-accent: #f5576c;
  --music-accent-glow: #f5576c80;
  
  /* 暗色背景 */
  --music-bg-dark: #0a0a0f;
  --music-bg-darker: #05050a;
  --music-bg-card: #121218;
  --music-bg-card-hover: #1a1a22;
  
  /* 毛玻璃效果 */
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
  
  /* 霓虹效果 */
  --neon-glow: 0 0 10px var(--music-accent-glow),
               0 0 20px var(--music-accent-glow),
               0 0 40px var(--music-accent-glow);
  
  /* 动态阴影 */
  --shadow-float: 0 20px 60px rgba(0, 0, 0, 0.3);
  --shadow-hover: 0 25px 70px rgba(0, 0, 0, 0.4);
}

/* ==========================================================================
   全局样式覆盖 - 音乐主题
   ========================================================================== */

body {
  background: var(--music-bg-dark);
  color: #ffffff;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', sans-serif;
}

/* ==========================================================================
   Hero 区域 - 音乐风格
   ========================================================================== */

.hero-music {
  position: relative;
  min-height: 85vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: var(--music-bg-darker);
}

/* 动态背景 */
.hero-music::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: var(--music-gradient-primary);
  opacity: 0.15;
  animation: rotate 30s linear infinite;
  border-radius: 40%;
}

@keyframes rotate {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* 渐变遮罩 */
.hero-music::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 0%, transparent 0%, var(--music-bg-darker) 70%);
  pointer-events: none;
}

.hero-music__content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 800px;
  padding: 0 2rem;
}

.hero-music__badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1.25rem;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: 50px;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 2rem;
  animation: fadeInUp 0.8s ease-out;
}

.hero-music__title {
  font-size: clamp(2.5rem, 8vw, 5rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 1.5rem;
  background: linear-gradient(135deg, #ffffff 0%, #a0a0ff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero-music__desc {
  font-size: clamp(1.125rem, 2vw, 1.375rem);
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.6;
  margin-bottom: 2.5rem;
  animation: fadeInUp 0.8s ease-out 0.4s both;
}

.hero-music__actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s ease-out 0.6s both;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ==========================================================================
   按钮系统 - 音乐风格
   ========================================================================== */

.btn-music {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  height: 56px;
  padding: 0 2rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 28px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  overflow: hidden;
  border: none;
  cursor: pointer;
}

.btn-music::before {
  content: '';
  position: absolute;
  inset: 0;
  background: inherit;
  opacity: 0;
  transition: opacity 0.3s;
}

.btn-music:hover::before {
  opacity: 1;
}

/* Primary - 渐变 */
.btn-music--primary {
  background: var(--music-gradient-primary);
  color: #ffffff;
  box-shadow: 0 10px 30px rgba(102, 126, 234, 0.4);
}

.btn-music--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 15px 40px rgba(102, 126, 234, 0.6);
}

.btn-music--primary:active {
  transform: translateY(0);
}

/* Accent */
.btn-music--accent {
  background: var(--music-gradient-secondary);
  color: #ffffff;
  box-shadow: 0 10px 30px rgba(245, 87, 108, 0.4);
}

.btn-music--accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 15px 40px rgba(245, 87, 108, 0.6);
}

/* Glass - 毛玻璃 */
.btn-music--glass {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  color: #ffffff;
}

.btn-music--glass:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

/* 播放按钮 */
.btn-play {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--music-gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  cursor: pointer;
  box-shadow: var(--shadow-float);
  transition: all 0.3s;
}

.btn-play:hover {
  transform: scale(1.1);
  box-shadow: var(--shadow-hover);
}

.btn-play svg {
  width: 24px;
  height: 24px;
  color: white;
  margin-left: 3px;
}

/* ==========================================================================
   卡片系统 - 音乐风格
   ========================================================================== */

.card-music {
  position: relative;
  background: var(--music-bg-card);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 20px;
  padding: 2rem;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  overflow: hidden;
}

.card-music::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--music-gradient-primary);
  opacity: 0;
  transition: opacity 0.3s;
}

.card-music:hover {
  background: var(--music-bg-card-hover);
  border-color: rgba(255, 255, 255, 0.1);
  transform: translateY(-8px);
  box-shadow: var(--shadow-float);
}

.card-music:hover::before {
  opacity: 1;
}

/* Glass 卡片 */
.card-glass {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  padding: 2rem;
  box-shadow: var(--glass-shadow);
}

/* Feature 卡片 */
.card-feature {
  text-align: center;
  padding: 2.5rem 2rem;
}

.card-feature__icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--music-gradient-primary);
  border-radius: 20px;
  color: white;
  transition: transform 0.3s;
}

.card-music:hover .card-feature__icon {
  transform: scale(1.1) rotate(5deg);
}

.card-feature__icon svg {
  width: 32px;
  height: 32px;
}

.card-feature__title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: #ffffff;
}

.card-feature__desc {
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.6;
}

/* ==========================================================================
   Section 样式
   ========================================================================== */

.section-music {
  padding: 6rem 0;
  position: relative;
}

.section-music--dark {
  background: var(--music-bg-darker);
}

.section-music--gradient {
  background: linear-gradient(180deg, var(--music-bg-dark) 0%, var(--music-bg-darker) 100%);
}

.section-header-music {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 4rem;
}

.section-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: 50px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--music-primary-light);
  margin-bottom: 1rem;
}

.section-title-music {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, #ffffff 0%, #c0c0ff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-desc-music {
  font-size: 1.125rem;
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.6;
}

/* ==========================================================================
   下载平台选择器
   ========================================================================== */

.platform-selector {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin: 3rem 0;
}

.platform-card {
  position: relative;
  background: var(--music-bg-card);
  border: 2px solid rgba(255, 255, 255, 0.05);
  border-radius: 20px;
  padding: 2rem;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  overflow: hidden;
}

.platform-card::before {
  content: '';
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  background: var(--music-gradient-primary);
  border-radius: 20px;
  opacity: 0;
  z-index: -1;
  transition: opacity 0.3s;
}

.platform-card:hover {
  transform: translateY(-5px);
  border-color: transparent;
}

.platform-card:hover::before {
  opacity: 1;
}

.platform-icon {
  width: 56px;
  height: 56px;
  margin-bottom: 1.25rem;
  padding: 12px;
  background: var(--glass-bg);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.platform-icon svg {
  width: 100%;
  height: 100%;
  color: var(--music-primary-light);
}

.platform-name {
  font-size: 1.25rem;
  font-weight: 600;
  color: #ffffff;
  margin-bottom: 0.5rem;
}

.platform-desc {
  font-size: 0.9375rem;
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: 1.25rem;
}

.platform-btn {
  width: 100%;
  height: 44px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  color: #ffffff;
  font-weight: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: all 0.2s;
}

.platform-card:hover .platform-btn {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
}

/* ==========================================================================
   FAQ 样式 - 音乐主题
   ========================================================================== */

.faq-music {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item-music {
  background: var(--music-bg-card);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 16px;
  margin-bottom: 1rem;
  overflow: hidden;
  transition: all 0.3s;
}

.faq-item-music:hover {
  border-color: rgba(255, 255, 255, 0.1);
}

.faq-item-music[open] {
  border-color: var(--music-primary);
}

.faq-question-music {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.5rem;
  cursor: pointer;
  list-style: none;
  user-select: none;
}

.faq-question-music::-webkit-details-marker {
  display: none;
}

.faq-question-text {
  font-size: 1.0625rem;
  font-weight: 500;
  color: #ffffff;
}

.faq-icon {
  width: 20px;
  height: 20px;
  color: rgba(255, 255, 255, 0.4);
  transition: transform 0.3s, color 0.3s;
  flex-shrink: 0;
}

.faq-item-music[open] .faq-icon {
  transform: rotate(180deg);
  color: var(--music-primary);
}

.faq-answer-music {
  padding: 0 1.5rem 1.5rem;
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.6;
}

/* ==========================================================================
   波形动画背景
   ========================================================================== */

.wave-bg {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 200px;
  overflow: hidden;
  pointer-events: none;
}

.wave {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 200%;
  height: 100%;
  background: var(--music-gradient-primary);
  opacity: 0.1;
  animation: wave 10s linear infinite;
  border-radius: 50% 50% 0 0;
}

.wave:nth-child(2) {
  animation-duration: 15s;
  animation-delay: -5s;
  opacity: 0.05;
}

@keyframes wave {
  0% {
    transform: translateX(0) translateY(0);
  }
  50% {
    transform: translateX(-25%) translateY(-10px);
  }
  100% {
    transform: translateX(-50%) translateY(0);
  }
}

/* ==========================================================================
   响应式调整
   ========================================================================== */

@media (max-width: 768px) {
  .hero-music {
    min-height: 70vh;
  }
  
  .hero-music__title {
    font-size: 2.5rem;
  }
  
  .hero-music__desc {
    font-size: 1.125rem;
  }
  
  .hero-music__actions {
    flex-direction: column;
    width: 100%;
  }
  
  .btn-music {
    width: 100%;
    max-width: 320px;
  }
  
  .section-music {
    padding: 4rem 0;
  }
  
  .section-header-music {
    margin-bottom: 3rem;
  }
  
  .platform-selector {
    grid-template-columns: 1fr;
  }
}

/* ==========================================================================
   深色模式优化（已经是暗色主题）
   ========================================================================== */

@media (prefers-color-scheme: light) {
  /* 如果用户偏好浅色，可以提供切换选项 */
  /* 但音乐站通常深色更有氛围感 */
}

/* ==========================================================================
   动画性能优化
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ==========================================================================
   加载动画
   ========================================================================== */

.music-loader {
  display: flex;
  gap: 0.5rem;
  align-items: flex-end;
  height: 40px;
}

.music-loader__bar {
  width: 4px;
  background: var(--music-gradient-primary);
  border-radius: 4px;
  animation: musicBar 1.2s ease-in-out infinite;
}

.music-loader__bar:nth-child(1) {
  animation-delay: 0s;
}

.music-loader__bar:nth-child(2) {
  animation-delay: 0.1s;
}

.music-loader__bar:nth-child(3) {
  animation-delay: 0.2s;
}

.music-loader__bar:nth-child(4) {
  animation-delay: 0.3s;
}

@keyframes musicBar {
  0%, 100% {
    height: 10px;
  }
  50% {
    height: 40px;
  }
}