/* 引入字体 */
@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@400;600;700&display=swap');

/* 变量定义 */
:root {
  --primary-color: #00bcd4; /* 浅青色 */
  --secondary-color: #26c6da; /* 浅青色 */
  --accent-color: #ffffff;
  --bg-gradient-start: #e0f7fa; /* 很浅的青色 */
  --bg-gradient-end: #b2ebf2; /* 略深的浅青色 */
  --card-bg: rgba(255, 255, 255, 0.9);
  --text-color: #004d40; /* 深青色 */
  --border-radius: 12px;
  --transition-speed: 0.3s;
  --box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

body.light-mode {
  --primary-color: #00acc1; /* 浅青色的变体 */
  --secondary-color: #4dd0e1; /* 更浅的青色 */
  --accent-color: #004d40; /* 深青色 */
  --bg-gradient-start: #b2ebf2;
  --bg-gradient-end: #e0f7fa;
  --card-bg: rgba(255, 255, 255, 0.9);
  --text-color: #004d40; /* 深青色 */
  --box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

/* 通用样式 */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Montserrat', sans-serif;
  background: linear-gradient(135deg, var(--bg-gradient-start), var(--bg-gradient-end));
  color: var(--text-color);
  overflow-x: hidden;
  scroll-behavior: smooth;
  transition: background var(--transition-speed), color var(--transition-speed);
}

.hero {
  position: relative;
  min-height: 100vh;
  background: url('https://source.unsplash.com/1600x900/?music') no-repeat center center/cover;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: var(--text-color);
  transition: background var(--transition-speed);
}

.overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(224, 247, 250, 0.7); /* 浅青色的透明度 */
  z-index: 1;
  transition: background-color var(--transition-speed);
}

body.light-mode .overlay {
  background-color: rgba(255, 255, 255, 0.7);
}

.hero-content {
  z-index: 2;
  max-width: 800px;
  padding: 0 20px;
  position: relative;
}

.toggle-theme {
  position: absolute;
  top: 20px;
  right: 20px;
  cursor: pointer;
}

.icon {
  width: 32px;
  height: 32px;
  fill: var(--text-color);
  transition: fill var(--transition-speed);
}

.hero-title {
  font-size: 4rem;
  margin-bottom: 20px;
  animation-delay: 0.5s;
}

.hero-subtitle {
  font-size: 1.5rem;
  margin-bottom: 40px;
  animation-delay: 1s;
}

.search-box {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  animation-delay: 1.5s;
}

#searchInput {
  width: 70%;
  padding: 15px 20px;
  border: none;
  border-radius: var(--border-radius);
  font-size: 1rem;
  outline: none;
  background: rgba(255, 255, 255, 0.9);
  color: var(--text-color);
  backdrop-filter: blur(5px);
  transition: background var(--transition-speed), color var(--transition-speed), transform var(--transition-speed);
}

#searchInput:hover {
  transform: scale(1.02);
}

#searchInput::placeholder {
  color: var(--text-color);
  opacity: 0.7;
}

#searchButton {
  position: absolute;
  right: 15%;
  padding: 15px 20px;
  border: none;
  background: var(--primary-color);
  border-radius: var(--border-radius);
  color: var(--accent-color);
  cursor: pointer;
  overflow: hidden;
  transition: background var(--transition-speed), transform var(--transition-speed);
}

#searchButton:hover {
  background: #0097a7;
  transform: translateY(-3px);
}

#searchButton span {
  position: relative;
  z-index: 2;
}

.scroll-indicator {
  position: absolute;
  bottom: 20px;
  width: 100%;
  text-align: center;
  z-index: 2;
}

.scroll-indicator span {
  display: inline-block;
  width: 20px;
  height: 35px;
  border: 2px solid var(--text-color);
  border-radius: 15px;
  position: relative;
  transition: border-color var(--transition-speed);
}

.scroll-indicator span::after {
  content: '';
  position: absolute;
  top: 8px;
  left: 50%;
  width: 6px;
  height: 6px;
  background: var(--text-color);
  border-radius: 50%;
  transform: translateX(-50%);
  animation: scroll 1.5s infinite;
  transition: background var(--transition-speed);
}

@keyframes scroll {
  0% {
    opacity: 1;
    top: 8px;
  }
  100% {
    opacity: 0;
    top: 25px;
  }
}

.results-section {
  background: linear-gradient(135deg, var(--bg-gradient-end), var(--bg-gradient-start));
  padding: 60px 20px;
  transition: background var(--transition-speed);
}

.results {
  max-width: 1200px;
  margin: 0 auto;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.song-card {
  display: flex;
  align-items: center;
  background: var(--card-bg);
  margin-bottom: 30px;
  padding: 20px;
  border-radius: var(--border-radius);
  backdrop-filter: blur(10px);
  box-shadow: var(--box-shadow);
  transition: transform 0.5s, background var(--transition-speed);
  position: relative;
  overflow: hidden;
  animation: fadeInUp 0.5s ease forwards;
}

.song-card:hover {
  transform: translateY(-10px);
}

.song-card::before {
  content: '';
  position: absolute;
  width: 100%;
  height: 0%;
  background: rgba(224, 247, 250, 0.3);
  bottom: 0;
  left: 0;
  transition: height 0.5s;
  z-index: -1;
}

.song-card:hover::before {
  height: 100%;
}

.song-cover {
  width: 150px;
  height: 150px;
  border-radius: var(--border-radius);
  margin-right: 30px;
  flex-shrink: 0;
  transition: transform 0.5s, box-shadow var(--transition-speed);
  box-shadow: var(--box-shadow);
}

.song-card:hover .song-cover {
  transform: rotate(-5deg) scale(1.05);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.song-info {
  flex: 1;
  color: var(--text-color);
  transition: color var(--transition-speed);
}

.song-title {
  font-size: 1.8rem;
  font-weight: 600;
  margin-bottom: 10px;
}

.song-meta {
  font-size: 1rem;
  color: var(--text-color);
  opacity: 0.8;
  margin-bottom: 5px;
  transition: color var(--transition-speed);
}

.quality-tags {
  margin-top: 10px;
}

.quality-tag {
  display: inline-block;
  margin-right: 10px;
  padding: 5px 10px;
  background: rgba(255, 255, 255, 0.7);
  border-radius: var(--border-radius);
  font-size: 0.9rem;
  transition: background var(--transition-speed);
}

body.light-mode .quality-tag {
  background: rgba(0, 0, 0, 0.1);
}

.player-controls {
  margin-top: 20px;
}

.button-group {
  display: flex;
  gap: 20px;
}

.play-btn,
.download-btn {
  padding: 10px 25px;
  border: none;
  border-radius: var(--border-radius);
  font-size: 1rem;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  color: var(--accent-color);
  transition: background var(--transition-speed), transform var(--transition-speed);
}

.play-btn {
  background: var(--primary-color);
}

.play-btn:hover {
  background: #0097a7;
  transform: translateY(-3px);
}

.download-btn {
  background: #00838f;
}

.download-btn:hover {
  background: #006064;
  transform: translateY(-3px);
}

.progress-bar {
  width: 100%;
  height: 6px;
  background: #004d40;
  border-radius: 3px;
  margin-top: 15px;
  position: relative;
  cursor: pointer;
  overflow: hidden;
  transition: background var(--transition-speed);
}

body.light-mode .progress-bar {
  background: #80deea;
}

.progress-bar-inner {
  width: 0%;
  height: 100%;
  background: var(--primary-color);
  border-radius: 3px;
  transition: width 0.1s linear;
}

.time-display {
  display: flex;
  justify-content: space-between;
  font-size: 0.9rem;
  color: var(--text-color);
  opacity: 0.8;
  margin-top: 10px;
  transition: color var(--transition-speed);
}

.loading {
  text-align: center;
  color: var(--text-color);
  font-size: 1.5rem;
}

.loading-spinner {
  display: inline-block;
  width: 50px;
  height: 50px;
  border: 5px solid rgba(255, 255, 255, 0.2);
  border-top: 5px solid var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin-bottom: 20px;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.back-to-top {
  position: fixed;
  bottom: 40px;
  right: 40px;
  background: var(--primary-color);
  color: var(--accent-color);
  padding: 15px;
  border: none;
  border-radius: 50%;
  font-size: 1.5rem;
  cursor: pointer;
  z-index: 10;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-speed), visibility var(--transition-speed), background var(--transition-speed), transform 0.3s;
}

.back-to-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: #0097a7;
  transform: translateY(-3px);
}

.footer {
  background: var(--bg-gradient-end);
  color: var(--text-color);
  text-align: center;
  padding: 20px;
  transition: background var(--transition-speed), color var(--transition-speed);
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 2.5rem;
  }

  .hero-subtitle {
    font-size: 1.2rem;
  }

  #searchInput {
    width: 80%;
  }

  #searchButton {
    right: 10%;
  }

  .song-card {
    flex-direction: column;
    align-items: center;
  }

  .song-cover {
    margin-right: 0;
    margin-bottom: 20px;
  }

  .back-to-top {
    bottom: 20px;
    right: 20px;
  }
}

.toggle-theme{
  display: none; /* 默认隐藏导航栏 */
}