/* 基础变量定义 */
:root {
  --bg-primary: #f8f9fa;
  --bg-secondary: #e9ecef;
  --text-primary: #212529;
  --text-secondary: #495057;
  --accent: #0d6efd;
  --test-waiting: #adb5bd;
  --test-ready: #198754;
  --test-too-soon: #dc3545;
  --shadow: rgba(0, 0, 0, 0.1);
  --ad-bg: #e2e8f0;
  --ad-border: #cbd5e0;
  --border-radius: 8px;
  --transition: all 0.3s ease;
}

.dark-mode {
  --bg-primary: #121212;
  --bg-secondary: #1e1e1e;
  --text-primary: #e0e0e0;
  --text-secondary: #a0a0a0;
  --accent: #0dcaf0;
  --test-waiting: #495057;
  --test-ready: #20c997;
  --test-too-soon: #ff6b6b;
  --shadow: rgba(0, 0, 0, 0.3);
  --ad-bg: #2d3748;
  --ad-border: #4a5568;
}

/* 基础重置样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  transition: background-color 0.5s, color 0.5s, var(--transition);
}

body {
  font-family: "Segoe UI", system-ui, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.6;
}

/* 头部与导航样式 */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 2rem;
  background-color: var(--bg-secondary);
  box-shadow: 0 2px 10px var(--shadow);
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  text-decoration: none;
}

.logo-icon {
  font-size: 1.5rem;
  color: var(--accent);
}

.navbar {
  padding: 0 1rem;
}

.nav-list {
  display: flex;
  list-style: none;
  gap: 2rem;
}

.nav-link {
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 500;
  padding: 0.5rem 0;
  border-bottom: 2px solid transparent;
  transition: var(--transition);
}

.nav-link:hover, .nav-link.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* 菜单切换按钮 */
.menu-toggle {
  display: none;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

/* 主题切换按钮 */
.theme-toggle {
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 0.5rem;
}

/* 主容器样式 */
.container {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 2rem;
  max-width: 1000px;
  margin: 0 auto;
  width: 100%;
}
/* 返回上页按钮样式 */
.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.8rem 1.5rem;
  background-color: var(--accent);
  color: white;
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  font-size: 1rem;
  font-weight: 500;
  transition: var(--transition);
  margin-bottom: 1.5rem;
}

.back-btn:hover {
  opacity: 0.9;
  transform: translateY(-2px);
}

.back-btn i {
  font-size: 0.9rem;
}

/* 响应式适配 */
@media (max-width: 600px) {
  .back-btn {
    padding: 0.6rem 1.2rem;
    font-size: 0.9rem;
  }
}

/* 广告区域通用样式 */
.ad-container {
  width: 100%;
  max-width: 1200px;
  margin: 1.5rem auto;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.ad-banner {
  background-color: var(--ad-bg);
  border: 1px solid var(--ad-border);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 90px;
  padding: 1rem;
  color: var(--text-secondary);
  font-size: 1rem;
  text-align: center;
}

.ad-content {
  max-width: 300px;
}

.ad-square {
  width: 300px;
  height: 250px;
  background-color: var(--ad-bg);
  border: 1px solid var(--ad-border);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-size: 1rem;
}

.ad-responsive {
  width: 100%;
  max-width: 728px;
  height: 90px;
  background-color: var(--ad-bg);
  border: 1px solid var(--ad-border);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-size: 1rem;
  margin: 0 auto;
}

/* 页脚样式 */
footer {
  text-align: center;
  padding: 1.5rem;
  background-color: var(--bg-secondary);
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: auto;
}

/* 动画效果 */
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
  20%, 40%, 60%, 80% { transform: translateX(5px); }
}

.pulse {
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.05); }
  100% { transform: scale(1); }
}

/* 响应式设计（通用部分） */
@media (max-width: 768px) {
  header {
    padding: 1.5rem 1rem !important;
    justify-content: space-between !important;
    align-items: center !important;
  }

  .navbar {
    position: fixed !important;
    top: 0 !important;
    right: 0 !important;
    height: 100vh !important;
    width: 250px !important;
    background-color: var(--bg-secondary) !important;
    box-shadow: -2px 0 10px var(--shadow) !important;
    transform: translateX(100%) !important;
    transition: transform 0.3s ease !important;
    z-index: 9999 !important;
    margin: 0 !important;
    padding: 2rem !important;
  }

  .navbar.active {
    transform: translateX(0) !important;
  }

  .nav-list {
    flex-direction: column !important;
    gap: 1.5rem !important;
    align-items: flex-start !important;
    margin-top: 4rem !important;
    padding: 0 !important;
  }

  .menu-toggle {
    display: block !important;
    margin-right: 0.5rem !important;
    z-index: 99999 !important;
  }

  .logo {
    flex-shrink: 0 !important;
  }

  .theme-toggle {
    flex-shrink: 0 !important;
    margin-left: 0.5rem !important;
  }
}