/* 英语四六级速过帮帮 - 主样式表 */

/* 全局重置 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
}

:root {
  --primary-color: #4169E1; /* 皇家蓝 - 主色调 */
  --secondary-color: #F0F8FF; /* 爱丽丝蓝 - 次要色调 */
  --accent-color: #FF6B6B; /* 珊瑚红 - 强调色 */
  --text-color: #333333; /* 深灰色 - 主文本颜色 */
  --light-text: #666666; /* 中灰色 - 次要文本 */
  --background: #FFFFFF; /* 白色 - 背景 */
  --shadow: 0 4px 12px rgba(0, 0, 0, 0.1); /* 阴影 */
  --radius: 8px; /* 圆角 */
  --transition: all 0.3s ease; /* 过渡效果 */
}

body {
  background-color: var(--background);
  color: var(--text-color);
  line-height: 1.6;
}

a {
  text-decoration: none;
  color: var(--primary-color);
  transition: var(--transition);
}

a:hover {
  color: var(--accent-color);
}

/* 容器 */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* 按钮样式 */
.btn {
  display: inline-block;
  padding: 10px 20px;
  background-color: var(--primary-color);
  color: white;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: var(--transition);
  font-weight: 500;
  text-align: center;
}

.btn:hover {
  background-color: #2a4fc3; /* 深蓝色 - 悬停状态 */
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.btn-secondary {
  background-color: var(--secondary-color);
  color: var(--primary-color);
  border: 1px solid var(--primary-color);
}

.btn-secondary:hover {
  background-color: var(--primary-color);
  color: white;
}

/* 卡片样式 */
.card {
  background: var(--background);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: var(--transition);
  margin-bottom: 20px;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.card-header {
  padding: 20px;
  background-color: var(--primary-color);
  color: white;
}

.card-body {
  padding: 20px;
}

/* 导航栏 */
.navbar {
  background-color: var(--primary-color);
  color: white;
  padding: 15px 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: var(--shadow);
}

.navbar-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.8rem;
  font-weight: 700;
  color: white;
}

.nav-links {
  display: flex;
  list-style: none;
}

.nav-links li {
  margin-left: 30px;
}

.nav-links a {
  color: white;
  font-weight: 500;
}

.nav-links a:hover {
  color: var(--secondary-color);
}

/* 页脚 */
.footer {
  background-color: var(--secondary-color);
  color: var(--text-color);
  padding: 40px 0;
  margin-top: 40px;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
}

.footer-info {
  max-width: 400px;
}

.footer-links {
  display: flex;
  flex-direction: column;
}

.footer-links h3 {
  margin-bottom: 15px;
  color: var(--primary-color);
}

.footer-links a {
  margin-bottom: 8px;
}

.copyright {
  margin-top: 30px;
  text-align: center;
  padding-top: 20px;
  border-top: 1px solid #ddd;
  color: var(--light-text);
}

/* 响应式设计 */
@media (max-width: 768px) {
  .navbar-container {
    flex-direction: column;
  }
  
  .nav-links {
    margin-top: 15px;
    width: 100%;
    justify-content: space-around;
  }
  
  .nav-links li {
    margin: 0;
  }
  
  .footer-content {
    flex-direction: column;
  }
  
  .footer-links {
    margin-top: 20px;
  }
}

/* 弹幕样式 */
.danmaku-container {
  position: fixed;
  top: 65px;
  left: 0;
  width: 100%;
  height: 200px;
  pointer-events: none;
  z-index: 999;
  overflow: hidden;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.danmaku {
  position: absolute;
  white-space: nowrap;
  left: 100%;
  background-color: rgba(255, 255, 255, 0.8);
  color: var(--primary-color);
  padding: 5px 10px;
  border-radius: 15px;
  font-size: 14px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
  animation: danmakuMove linear forwards;
  pointer-events: none;
  max-width: 300px;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* 用户自己发送的弹幕样式 */
.user-danmaku {
  background-color: rgba(65, 105, 225, 0.9);
  color: white;
  font-weight: 500;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.3);
  z-index: 1000; /* 确保自己的弹幕显示在最上层 */
}

/* 用户标签样式 */
.user-tag {
  background-color: #FF6B6B;
  color: white;
  padding: 1px 5px;
  border-radius: 10px;
  font-size: 12px;
  margin-right: 5px;
  font-weight: bold;
}

@keyframes danmakuMove {
  from {
    transform: translateX(0);
  }
  to {
    transform: translateX(-200%);
  }
}

/* 深色模式下的弹幕样式 */
.dark-mode .danmaku {
  background-color: rgba(45, 50, 80, 0.9);
  color: #e0e0e0;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
}

.dark-mode .user-danmaku {
  background-color: rgba(73, 84, 145, 0.9);
  color: white;
  border-color: rgba(123, 146, 255, 0.4);
}

.dark-mode .user-tag {
  background-color: #7b92ff;
}

/* 学习卡片特殊样式 */
.word-card {
  padding: 30px;
  margin-bottom: 30px;
  position: relative;
}

.word-header {
  display: flex;
  align-items: center;
  margin-bottom: 15px;
}

.word-text {
  font-size: 2rem;
  font-weight: 700;
  margin-right: 15px;
}

.word-phonetic {
  font-size: 1.2rem;
  color: var(--light-text);
}

.word-audio {
  margin-left: 10px;
  font-size: 1.5rem;
  color: var(--primary-color);
  cursor: pointer;
  transition: var(--transition);
}

.word-audio:hover {
  color: var(--accent-color);
  transform: scale(1.1);
}

.word-meaning {
  margin-bottom: 15px;
  font-size: 1.1rem;
}

.word-example {
  padding: 15px;
  background-color: var(--secondary-color);
  border-radius: var(--radius);
  margin-bottom: 15px;
}

.word-keypoint {
  padding: 15px;
  background-color: rgba(255, 107, 107, 0.1);
  border-left: 4px solid var(--accent-color);
  margin-bottom: 15px;
}

.bookmark-btn {
  position: absolute;
  top: 20px;
  right: 20px;
  color: #ccc;
  font-size: 1.5rem;
  cursor: pointer;
  transition: var(--transition);
}

.bookmark-btn:hover,
.bookmark-btn.active {
  color: gold;
}

/* 弹幕控制按钮样式 */
.danmaku-toggle {
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--primary-color);
  color: white;
  border: none;
  cursor: pointer;
  z-index: 1001;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.danmaku-toggle:hover {
  background-color: var(--primary-hover);
  transform: scale(1.1);
}

/* 深色模式基础样式 */
body.dark-mode {
    background-color: #1a1d2f;
    color: #e0e0e0;
}

.dark-mode .navbar {
    background-color: #1e2235;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.dark-mode .btn {
    background-color: #3d4367;
}

.dark-mode .btn:hover {
    background-color: #525b85;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
}

.dark-mode .btn-secondary {
    background-color: #262a40;
    color: #e0e0e0;
    border-color: #3d4367;
}

.dark-mode .btn-secondary:hover {
    background-color: #3d4367;
    color: #e0e0e0;
}

.dark-mode .card {
    background-color: #262a40;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.dark-mode .card:hover {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
}

.dark-mode .card-header {
    background-color: #1e2235;
}

.dark-mode .nav-links a {
    color: #e0e0e0;
}

.dark-mode .nav-links a:hover {
    color: #a3a8c3;
}

.dark-mode .footer {
    background-color: #1e2235;
    color: #e0e0e0;
}

.dark-mode .footer-links h3 {
    color: #a3a8c3;
}

.dark-mode .copyright {
    border-top-color: #3d4367;
    color: #a3a8c3;
}

.dark-mode .danmaku-toggle {
    background-color: #3d4367;
}

.dark-mode .danmaku-toggle:hover {
    background-color: #525b85;
}

/* 学习选项卡片的深色模式 */
.dark-mode .learning-option {
    background-color: #262a40;
}

.dark-mode .option-icon,
.dark-mode .option-title {
    color: #7b92ff;
}

.dark-mode .option-description {
    color: #b0b0b0;
}

/* 额外的深色模式全局样式 */
.dark-mode h1,
.dark-mode h2,
.dark-mode h3,
.dark-mode h4,
.dark-mode h5,
.dark-mode h6 {
    color: #e0e0e0;
}

.dark-mode p {
    color: #b0b0b0;
}

.dark-mode a {
    color: #7b92ff;
}

.dark-mode a:hover {
    color: #98a8ff;
}

.dark-mode section {
    background-color: #1a1d2f;
}

.dark-mode .container {
    background-color: transparent;
}