/* 全局统一样式 - 所有页面共用 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Microsoft YaHei", sans-serif;
}
body {
    background: #f5f7fa;
    padding-top: 60px;
}

/* 导航栏 - 固定顶部 */
.nav {
    width: 100%;
    height: 60px;
    background: #1f2937;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 9999;
    display: flex;
    align-items: center;
    padding: 0 20px;
}

/* Logo */
.nav-logo {
    color: #fff;
    font-size: 18px;
    font-weight: bold;
    text-decoration: none;
}

/* PC 菜单 */
.nav-pc {
    display: flex;
    gap: 25px;
    margin-left: auto;
}
.nav-pc a {
    color: #e5e7eb;
    text-decoration: none;
    font-size: 14px;
}
.nav-pc a:hover {
    color: #fff;
}

/* 手机端按钮 - 靠右 */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: #fff;
    font-size: 24px;
    cursor: pointer;
    margin-left: auto;
}

/* 手机折叠菜单 */
.nav-mobile {
    position: fixed;
    top: 60px;
    left: 0;
    width: 100%;
    background: #1f2937;
    padding: 15px 20px;
    display: none;
    flex-direction: column;
    gap: 12px;
    z-index: 9998;
}
.nav-mobile a {
    color: #e5e7eb;
    text-decoration: none;
    padding: 5px 0;
}
.nav-mobile.show {
    display: flex;
}

/* 响应式 */
@media (max-width: 768px) {
    .nav-pc {
        display: none;
    }
    .nav-toggle {
        display: block;
    }
}

/* 通用卡片 */
.card {
    max-width: 400px;
    margin: 30px auto;
    background: #fff;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}
.card h3 {
    text-align: center;
    margin-bottom: 20px;
    font-size: 18px;
}
.form-item {
    margin-bottom: 15px;
}
.form-item input {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 14px;
}
.btn {
    width: 100%;
    padding: 12px;
    background: #007bff;
    color: #fff;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
}
.btn-success {
    background: #28a745;
}
.tip {
    color: red;
    text-align: center;
    margin-top: 10px;
    font-size: 13px;
}
.text-center {
    text-align: center;
    margin-top: 15px;
}
.text-center a {
    color: #007bff;
    text-decoration: none;
}