/* 通用样式文件 - 包含所有页面共享的基础样式 */

/* 基础样式 */
* {
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    margin: 0;
    padding: 0;
    background: #f8f9fa;
    line-height: 1.6;
}

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

/* 头部样式 */
.header {
    background: #fff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header .container {
    max-width: 1200px !important;
    margin: 0 auto !important;
    padding: 0 20px !important;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo a {
    text-decoration: none;
    color: #2c3e50;
    font-size: 1.5rem;
    font-weight: bold;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo a:hover {
    color: #3498db;
}

.logo i {
    color: #3498db;
}

.nav {
    display: flex;
    gap: 2rem;
}

.nav a {
    text-decoration: none;
    color: #666;
    font-weight: 500;
    transition: color 0.3s;
    padding: 0.5rem 1rem;
    border-radius: 6px;
}

.nav a:hover,
.nav a.active {
    color: #3498db;
    background: rgba(52, 152, 219, 0.1);
}

/* 用户操作区域 */
.user-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.auth-buttons {
    display: flex;
    gap: 10px;
}

.auth-btn {
    padding: 8px 16px;
    border: none;
    border-radius: 6px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

.login-btn {
    background: transparent;
    color: #007bff;
    border: 1px solid #007bff;
}

.login-btn:hover {
    background: #007bff;
    color: white;
}

.register-btn {
    background: #007bff;
    color: white;
}

.register-btn:hover {
    background: #0056b3;
}

/* 用户信息 */
.user-info {
    position: relative;
}

.user-menu {
    position: relative;
}

.user-btn {
    background: none;
    border: none;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s;
    color: #333;
    font-weight: 500;
}

.user-btn:hover {
    background: rgba(0, 0, 0, 0.05);
}

.user-btn i {
    font-size: 16px;
    color: #666;
}

.user-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    background: white;
    border: 1px solid #e1e5e9;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    min-width: 200px;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s;
}

.user-dropdown.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.user-dropdown a {
    display: block;
    padding: 12px 16px;
    text-decoration: none;
    color: #333;
    transition: background 0.3s;
    border-bottom: 1px solid #f0f0f0;
}

.user-dropdown a:last-child {
    border-bottom: none;
}

.user-dropdown a:hover {
    background: #f8f9fa;
    color: #007bff;
}

.user-dropdown a i {
    margin-right: 8px;
    width: 16px;
    text-align: center;
}

.user-dropdown a:last-child {
    color: #dc3545;
}

.user-dropdown a:last-child:hover {
    background: #dc3545;
    color: white;
}

/* 搜索框样式 */
.search-box {
    display: flex;
    align-items: center;
    background: #f8f9fa;
    border-radius: 20px;
    padding: 8px 15px;
    margin-right: 15px;
}

.search-box input {
    border: none;
    background: none;
    outline: none;
    width: 200px;
    font-size: 14px;
}

.search-box button {
    border: none;
    background: none;
    color: #666;
    cursor: pointer;
}

/* 按钮样式 */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
}

.btn-primary {
    background: #007bff;
    color: white;
}

.btn-primary:hover {
    background: #0056b3;
}

.btn-secondary {
    background: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background: #545b62;
}

/* 卡片样式 */
.card {
    background: #fff;
    border: 1px solid #e1e5e9;
    border-radius: 8px;
    overflow: hidden;
    transition: all 0.3s ease;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0,0,0,0.1);
}

/* 加载动画 */
.loading {
    text-align: center;
    padding: 20px;
}

.spinner {
    border: 3px solid #f3f3f3;
    border-top: 3px solid #007bff;
    border-radius: 50%;
    width: 30px;
    height: 30px;
    animation: spin 1s linear infinite;
    margin: 0 auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 错误消息 */
.error-message {
    background: #f8d7da;
    color: #721c24;
    padding: 12px;
    border-radius: 6px;
    margin: 10px 0;
    border: 1px solid #f5c6cb;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 1rem;
    }
    
    .logo a {
        font-size: 1.2rem;
    }
    
    .nav {
        gap: 1rem;
    }
    
    .nav a {
        padding: 0.3rem 0.8rem;
        font-size: 14px;
    }
    
    .auth-btn {
        padding: 6px 12px;
        font-size: 14px;
    }
    
    .user-btn {
        padding: 6px 8px;
        font-size: 14px;
    }
}

@media (max-width: 480px) {
    .nav {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .nav a {
        font-size: 13px;
        padding: 0.2rem 0.6rem;
    }
    
    .auth-buttons {
        flex-direction: column;
        gap: 5px;
    }
    
    .auth-btn {
        font-size: 13px;
        padding: 5px 10px;
    }
    
    .auth-btn i {
        display: none;
    }
}

/* 工具类 */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 1rem; }
.mt-4 { margin-top: 1.5rem; }
.mt-5 { margin-top: 3rem; }

.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 1rem; }
.mb-4 { margin-bottom: 1.5rem; }
.mb-5 { margin-bottom: 3rem; }

.p-1 { padding: 0.25rem; }
.p-2 { padding: 0.5rem; }
.p-3 { padding: 1rem; }
.p-4 { padding: 1.5rem; }
.p-5 { padding: 3rem; }

.d-none { display: none; }
.d-block { display: block; }
.d-flex { display: flex; }
.d-grid { display: grid; }

.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-around { justify-content: space-around; }

.align-center { align-items: center; }
.align-start { align-items: flex-start; }
.align-end { align-items: flex-end; }