/* 基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    color: #333;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background-color: #f0f2f5;
}

/* 头部样式 */
header {
    background: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
    padding: 1rem 0;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    color: white;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

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

.logo {
    display: flex;
    align-items: center;
}

.logo-text {
    font-size: 1.6rem;
    font-weight: bold;
    color: white;
    text-shadow: 1px 1px 2px rgba(0,0,0,0.2);
}

.nav-menu {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-item {
    margin-left: 2rem;
}

.nav-link {
    color: rgba(255,255,255,0.9);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s;
    padding: 0.5rem 0.8rem;
    border-radius: 20px;
}

.nav-link:hover {
    color: white;
    background-color: rgba(255,255,255,0.2);
}

.nav-link.active {
    color: #2575fc;
    background-color: white;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

/* 主要内容 */
main {
    flex: 1;
    padding: 2.5rem 0;
}

/* 页面标题 */
.page-header {
    text-align: center;
    margin-bottom: 2rem;
}

.page-title {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    background: linear-gradient(to right, #6a11cb, #2575fc);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
}

.page-subtitle {
    font-size: 1.2rem;
    color: #5a6a7e;
    max-width: 800px;
    margin: 0 auto;
}

/* 页脚样式 */
footer {
    background: linear-gradient(135deg, #2c3e50 0%, #1a2a3a 100%);
    color: white;
    padding: 3rem 0 0;
    margin-top: 3rem;
}

.footer-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h5 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: #ecf0f1;
}

.footer-section p {
    color: #bdc3c7;
    margin-bottom: 1rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section ul li a {
    color: #bdc3c7;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-section ul li a:hover {
    color: white;
}

.footer-bottom {
    background-color: rgba(0,0,0,0.2);
    padding: 1.5rem 0;
    text-align: center;
    font-size: 0.9rem;
    color: #95a5a6;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 0.6rem 1.2rem;
    border-radius: 8px;
    font-weight: 500;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    border: none;
    font-size: 1rem;
}

.btn-primary {
    background: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
    color: white;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0,0,0,0.15);
}

.btn-secondary {
    background-color: #e0e6ed;
    color: #5a6a7e;
}

.btn-secondary:hover {
    background-color: #d0d6dd;
    color: #333;
}

/* 表单元素 */
input[type="text"],
input[type="number"],
input[type="email"],
input[type="password"],
select,
textarea {
    width: 100%;
    padding: 0.8rem 1rem;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.3s;
    background-color: #f8f9fa;
}

input[type="text"]:focus,
input[type="number"]:focus,
input[type="email"]:focus,
input[type="password"]:focus,
select:focus,
textarea:focus {
    border-color: #6a11cb;
    box-shadow: 0 0 0 3px rgba(106, 17, 203, 0.2);
    outline: none;
}

/* 卡片样式 */
.card {
    background-color: white;
    border-radius: 12px;
    box-shadow: 0 8px 20px rgba(0,0,0,0.08);
    padding: 2rem;
    margin-bottom: 2rem;
    transition: all 0.3s;
}

.card:hover {
    box-shadow: 0 12px 30px rgba(0,0,0,0.12);
    transform: translateY(-5px);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .page-title {
        font-size: 2rem;
    }
    
    .page-subtitle {
        font-size: 1rem;
    }
    
    .card {
        padding: 1.5rem;
    }
}