:root {
  /* 亮色主题变量 */
  --bg-primary: #0f1624;
  --bg-secondary: #1a2235;
  --text-primary: #ffffff;
  --text-secondary: #b0b0b0;
  --accent-primary: #00ffff;
  --accent-secondary: #ff007f;
  --border-color: #2a3347;
  --card-bg: #1a2235;
  --input-bg: #232e46;
  --input-border: #39465f;
  --button-primary: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
  --button-hover: linear-gradient(90deg, var(--accent-secondary), var(--accent-primary));
  --button-text: #000000;
  --shadow-color: rgba(0, 255, 255, 0.2);
  --overlay-bg: rgba(15, 22, 36, 0.8);
  
  /* 动画持续时间 */
  --transition-speed: 0.3s;
}

[data-theme="light"] {
  --bg-primary: #ffffff;
  --bg-secondary: #f5f5f5;
  --text-primary: #1a1a1a;
  --text-secondary: #666666;
  --accent-primary: #0056d6;
  --accent-secondary: #ff007f;
  --border-color: #e0e0e0;
  --card-bg: #ffffff;
  --input-bg: #f5f5f5;
  --input-border: #cccccc;
  --button-primary: linear-gradient(90deg, #0056d6, #0095ff);
  --button-hover: linear-gradient(90deg, #0095ff, #0056d6);
  --button-text: #ffffff;
  --shadow-color: rgba(0, 0, 0, 0.1);
  --overlay-bg: rgba(240, 240, 240, 0.8);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Poppins', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  transition: background-color var(--transition-speed), color var(--transition-speed), border-color var(--transition-speed);
}

html, body {
  width: 100%;
  min-height: 100vh;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  scroll-behavior: smooth;
}

body {
  overflow-x: hidden;
}

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

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

button, .btn {
  padding: 12px 24px;
  border: none;
  border-radius: 50px;
  background: var(--button-primary);
  color: var(--button-text);
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--transition-speed), box-shadow var(--transition-speed);
  box-shadow: 0 4px 20px var(--shadow-color);
}

button:hover, .btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px var(--shadow-color);
  background: var(--button-hover);
}

input, select, textarea {
  padding: 12px 16px;
  border-radius: 8px;
  border: 1px solid var(--input-border);
  background-color: var(--input-bg);
  color: var(--text-primary);
  width: 100%;
  font-size: 16px;
  transition: all var(--transition-speed);
}

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px var(--shadow-color);
}

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

.card {
  background-color: var(--card-bg);
  border-radius: 16px;
  padding: 24px;
  box-shadow: 0 8px 30px var(--shadow-color);
  border: 1px solid var(--border-color);
}

/* 通用动画 */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fadeIn {
  animation: fadeIn 0.5s ease forwards;
}

/* 主题切换按钮 */
.theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 100;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  background-color: var(--card-bg);
  box-shadow: 0 4px 20px var(--shadow-color);
  border: 1px solid var(--border-color);
}

.theme-toggle i {
  font-size: 24px;
  color: var(--accent-primary);
}

/* 响应式布局 */
@media (max-width: 768px) {
  .container {
    padding: 0 15px;
  }
  
  button, .btn {
    padding: 10px 18px;
  }
}

/* 滚动条样式 */
::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--accent-primary);
  border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent-secondary);
}

/* 通知提示样式 */
.toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.toast {
  background-color: var(--card-bg);
  border-left: 4px solid var(--accent-primary);
  padding: 12px 15px;
  border-radius: 6px;
  box-shadow: 0 5px 15px var(--shadow-color);
  display: flex;
  align-items: center;
  gap: 12px;
  transform: translateX(120%);
  opacity: 0;
  transition: transform 0.3s, opacity 0.3s;
  width: 300px;
  max-width: 90vw;
}

.toast.show {
  transform: translateX(0);
  opacity: 1;
}

.toast-success {
  border-left-color: #4caf50;
}

.toast-error {
  border-left-color: #f44336;
}

.toast-warning {
  border-left-color: #ff9800;
}

.toast-icon {
  color: var(--accent-primary);
  font-size: 20px;
  flex-shrink: 0;
}

.toast-success .toast-icon {
  color: #4caf50;
}

.toast-error .toast-icon {
  color: #f44336;
}

.toast-warning .toast-icon {
  color: #ff9800;
}

.toast-message {
  flex: 1;
  font-size: 14px;
  color: var(--text-primary);
}

/* 粒子背景样式 */
.particles .particle {
  position: absolute;
  background: var(--accent-primary);
  border-radius: 50%;
  opacity: 0.5;
  animation: float infinite linear;
}

@keyframes float {
  0% {
    transform: translate(0, 0) rotate(0deg) scale(1);
    opacity: 0.2;
  }
  25% {
    opacity: 0.5;
  }
  50% {
    transform: translate(70px, -100px) rotate(180deg) scale(1.5);
    opacity: 0.3;
  }
  75% {
    opacity: 0.5;
  }
  100% {
    transform: translate(0, 0) rotate(360deg) scale(1);
    opacity: 0.2;
  }
}

/* 标签和徽章样式 */
.tag, .badge {
  display: inline-block;
  padding: 3px 8px;
  border-radius: 50px;
  font-size: 12px;
  font-weight: 500;
}

.tag {
  background-color: var(--input-bg);
  color: var(--text-secondary);
}

.badge {
  background: var(--button-primary);
  color: var(--button-text);
}

/* 动作标签 */
.action-tag {
  padding: 5px 10px;
  border-radius: 50px;
  font-size: 12px;
  font-weight: 500;
}

.action-tag.single {
  background-color: rgba(0, 128, 255, 0.2);
  color: #0080ff;
}

.action-tag.together {
  background-color: rgba(255, 0, 127, 0.2);
  color: #ff007f;
}

/* 提示框样式 */
.tips-card {
  display: flex;
  gap: 15px;
  background-color: var(--card-bg);
  border-radius: 12px;
  padding: 20px;
  margin: 20px 0;
  border: 1px solid var(--border-color);
  box-shadow: 0 5px 15px var(--shadow-color);
}

.tips-icon {
  font-size: 24px;
  color: var(--accent-primary);
  flex-shrink: 0;
}

.tips-content {
  flex: 1;
}

.tips-title {
  font-size: 18px;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.tips-list {
  list-style-type: none;
  padding: 0;
  margin: 0;
}

.tips-list li {
  padding: 5px 0;
  position: relative;
  padding-left: 20px;
  color: var(--text-secondary);
}

.tips-list li:before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--accent-primary);
}

/* 同步提示样式 */
.sync-tips {
  display: flex;
  gap: 15px;
  padding: 20px;
}

.sync-icon {
  font-size: 30px;
  color: var(--accent-primary);
  flex-shrink: 0;
}

.sync-title {
  margin-bottom: 15px;
  color: var(--text-primary);
}

.sync-steps {
  padding-left: 20px;
  margin-bottom: 15px;
  color: var(--text-secondary);
}

.sync-steps li {
  margin-bottom: 8px;
}

.sync-steps .highlight {
  color: var(--accent-primary);
  font-weight: 500;
}

.sync-note {
  font-style: italic;
  font-size: 14px;
  color: var(--text-secondary);
  border-top: 1px dashed var(--border-color);
  padding-top: 10px;
}

/* 站点底部 */
.site-footer {
  background-color: var(--bg-secondary);
  padding: 20px 0;
  margin-top: auto;
  border-top: 1px solid var(--border-color);
}

.footer-content {
  display: flex;
  flex-direction: column;
  gap: 20px;
  text-align: center;
}

.footer-info {
  color: var(--text-secondary);
  font-size: 14px;
}

.footer-info .warning {
  color: #ff9800;
  margin-bottom: 10px;
}

.footer-info .copyright {
  color: var(--text-secondary);
}

/* 用户状态显示 */
.user-status {
  margin-bottom: 20px;
}

.logged-in-user {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

.welcome {
  color: var(--text-secondary);
}

.username {
  color: var(--accent-primary);
  font-weight: 600;
}

.logout-btn {
  color: var(--text-secondary);
  font-size: 14px;
}

.auth-buttons {
  display: flex;
  justify-content: center;
  gap: 15px;
}

.auth-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 15px;
  border-radius: 50px;
  transition: all 0.3s;
  font-size: 14px;
}

.login-btn {
  background-color: var(--card-bg);
  color: var(--accent-primary);
  border: 1px solid var(--border-color);
}

.register-btn {
  background: var(--button-primary);
  color: var(--button-text);
}

.login-btn:hover {
  background-color: var(--input-bg);
  transform: translateY(-2px);
}

.register-btn:hover {
  background: var(--button-hover);
  transform: translateY(-2px);
}

/* 微妙骨架加载效果 */
.skeleton {
  background: linear-gradient(90deg, var(--card-bg) 0%, var(--input-bg) 50%, var(--card-bg) 100%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: 4px;
}

@keyframes shimmer {
  0% {
    background-position: -200% 0;
  }
  100% {
    background-position: 200% 0;
  }
}

/* 页脚链接样式 */
.footer-links {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-top: 15px;
}

.footer-link {
  color: var(--text-secondary);
  transition: color 0.3s;
  font-size: 14px;
}

.footer-link:hover {
  color: var(--accent-primary);
}