/* ===== 极简专业基础样式 ===== */
*{
    margin: 0;
    padding: 0;
    text-decoration: none;
}

body {
    text-decoration: none;
    font-family: 'Segoe UI', system-ui, sans-serif;
    background: var(--bg);
    color: #333;
    line-height: 1.6;
}

.app-header {
    background: white;
    box-shadow: 0 2px 10px rgba(0,0,0,0.08);
    position: sticky;
    top: 0;
    z-index: 100;
}

.main-nav {
    display: flex;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0.8rem 1.5rem;
}

.nav-brand {
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--primary);
    margin-right: auto;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.nav-link {
    color: #555;
    font-weight: 500;
    position: relative;
    transition: color 0.2s;
}

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

.nav-cta {
    background: var(--primary);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-weight: 600;
}

.nav-cta1 {
    background-color: rgb(5, 144, 194);
}

/* ===== 游戏化元素 ===== */
/* 1. 徽章系统 */
.nav-badge {
    position: absolute;
    top: -8px;
    right: -8px;
    background: var(--accent);
    color: white;
    border-radius: 50%;
    width: 18px;
    height: 18px;
    font-size: 0.7rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 2. 经验进度条 */
.xp-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: #e0e0e0;
}

.xp-progress {
    height: 100%;
    background: linear-gradient(90deg, var(--secondary), var(--accent));
    transition: width 0.5s;
}

.xp-text {
    position: absolute;
    right: 1rem;
    bottom: 1rem;
    font-size: 0.8rem;
    color: var(--primary);
    background: white;
    padding: 0.2rem 0.5rem;
    border-radius: 12px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

/* 3. 用户头像交互 */
.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid transparent;
    transition: all 0.3s;
    display: grid;
    place-items: center;
}

.user-avatar img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
}

.user-avatar:hover {
    border-color: var(--accent);
    transform: scale(1.1);
}

/* ===== 极简卡片样式 ===== */
.card {
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    padding: 1.2rem;
    margin-bottom: 1rem;
    transition: transform 0.2s;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

/* ===== 登录页专属样式 ===== */
.auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: calc(100vh - 120px);
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

.auth-card {
    width: 100%;
    max-width: 420px;
    background: white;
    border-radius: 12px;
    box-shadow: 0 6px 20px rgba(0,0,0,0.08);
    padding: 2.5rem;
    animation: fadeInUp 0.6s ease;
}

.auth-header {
    text-align: center;
    margin-bottom: 2rem;
}

.auth-header h1 {
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

/* 游戏化经验条 */
.xp-mini {
    display: flex;
    align-items: center;
    gap: 8px;
    justify-content: center;
    margin-top: 1rem;
}

.xp-track {
    width: 100px;
    height: 6px;
    background: #e0e0e0;
    border-radius: 3px;
    overflow: hidden;
}

.xp-track::after {
    content: '';
    display: block;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, var(--secondary), var(--accent));
    animation: xpProgress 1.5s ease-in-out;
}

.xp-label {
    font-size: 0.8rem;
    color: var(--accent);
    font-weight: 500;
}

/* 输入框样式 */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    color: #555;
    font-weight: 500;
    font-size: 0.95rem;
}

.input-wrapper {
    position: relative;
}

.form-input {
    width: 85%;
    padding: 0.8rem 1rem 0.8rem 2.5rem;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.3s;
}

.form-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(74, 111, 165, 0.1);
    outline: none;
}

.input-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: #999;
}

/* 记住我复选框 */
.remember-me {
    display: flex;
    align-items: center;
    cursor: pointer;
    color: #666;
    font-size: 0.9rem;
}

.remember-me input {
    position: absolute;
    opacity: 0;
}

.checkmark {
    display: inline-block;
    width: 18px;
    height: 18px;
    border: 2px solid #ddd;
    border-radius: 4px;
    margin-right: 8px;
    position: relative;
    transition: all 0.2s;
}

.remember-me input:checked ~ .checkmark {
    background-color: var(--primary);
    border-color: var(--primary);
}

.checkmark::after {
    content: "✓";
    position: absolute;
    color: white;
    font-size: 12px;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    opacity: 0;
    transition: opacity 0.2s;
}

.remember-me input:checked ~ .checkmark::after {
    opacity: 1;
}

/* 登录按钮 */
.auth-btn {
    width: 100%;
    padding: 0.9rem;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 2px 8px rgba(74, 111, 165, 0.3);
}

.auth-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(74, 111, 165, 0.4);
}

/* 底部链接 */
.auth-links {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    margin-top: 1.5rem;
    font-size: 0.9rem;
}

.link-text {
    color: #666;
    text-decoration: none;
    transition: color 0.2s;
}

.link-highlight {
    color: var(--primary);
    font-weight: 500;
}

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

.divider {
    color: #ddd;
}

.flash-container {
    position: fixed;
    right: 30px;
    bottom: 30px;
    width: 220px;
    padding: 10px;
    background: linear-gradient(135deg, #f8f9fa 0%, #6ECCAF 100%);
    border: 1px solid #4dd0e1;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0, 150, 180, 0.2);
    z-index: 1000;
    overflow: hidden;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}
/* 响应式消息栏 */
@media (max-width: 768px) {
    .flash-container {
        width: 250px;
        right: 10px;
        bottom: 10px;
    }
}


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

@keyframes xpProgress {
    from { width: 0; }
    to { width: 100%; }
}


.user-dropdown {
    position: relative;
    display: inline-block;
  }
  
  .user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    transition: transform 0.3s;
  }
  
  .user-dropdown:hover .user-avatar {
    transform: scale(1.05);
  }
  
  .dropdown-menu {
    opacity: 0;
    visibility: hidden;
    transform: translateY(-15px);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    
    position: absolute;
    top: 100%;
    left: 0;
    background: white;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    border-radius: 6px;
    min-width: 160px;
    padding: 8px 0;
  }
  
  .user-dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(5px); /* 轻微下移增强动感 */
  }
  
  .dropdown-menu a {
    display: block;
    padding: 10px 16px;
    color: #333;
    text-decoration: none;
    transition: background 0.2s;
  }
  
  .dropdown-menu a:hover {
    background: #f8f9fa;
  }

  .add-tag-btn {
      display: inline-flex;
      align-items: center;
      margin-top: 1rem;
      padding: 0.6rem 1rem;
      background: linear-gradient(135deg, #4a6cf7, #6a4af7);
      color: white;
      border-radius: 30px;
      text-decoration: none;
      font-weight: 500;
      font-size: 15px;
      box-shadow: 0 2px 10px rgba(74, 108, 247, 0.3);
      transition: all 0.3s ease;
      border: none;
      cursor: pointer;
  }
  
  .add-tag-btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 4px 15px rgba(74, 108, 247, 0.4);
      background: linear-gradient(135deg, #3a5ce4, #5a3ae4);
  }
  
  .add-tag-btn:active {
      transform: translateY(0);
  }
  
  .btn-icon {
      display: inline-block;
      margin-right: 8px;
      font-size: 18px;
      transition: transform 0.3s;
  }
  
  .add-tag-btn:hover .btn-icon {
      transform: rotate(90deg);
  }
  
  /* 如果需要在卡片中使用 */
  .card .add-tag-btn {
      padding: 8px 16px;
      font-size: 14px;
  }
  
  /* 暗色模式适配 */
  @media (prefers-color-scheme: dark) {
      .add-tag-btn {
          background: linear-gradient(135deg, #3a5ce4, #5a3ae4);
      }
  }