/* 基础重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
    /* 渐变背景，呼应主页颜色 */
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.auth-container {
    width: 100%;
    max-width: 400px;
    padding: 20px;
}

.back-to-home {
    margin-bottom: 15px;
}

.back-to-home a {
    text-decoration: none;
    color: #666;
    font-size: 0.9rem;
    transition: color 0.3s;
}

.back-to-home a:hover {
    color: #4a90e2;
}

/* 登录卡片样式 */
.auth-card {
    background: #fff;
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
}

.auth-header {
    text-align: center;
    margin-bottom: 30px;
}

.auth-header h2 {
    color: #333;
    font-size: 1.8rem;
    margin-bottom: 8px;
}

.auth-header p {
    color: #888;
    font-size: 0.9rem;
}

/* 表单输入组 */
.input-group {
    margin-bottom: 20px;
}

.input-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 0.9rem;
    color: #555;
    font-weight: 500;
}

.input-group input {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 8px;
    outline: none;
    transition: all 0.3s;
}

.input-group input:focus {
    border-color: #4a90e2;
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.1);
}

.forgot-pwd {
    text-align: right;
    margin-top: 5px;
}

.forgot-pwd a {
    font-size: 0.8rem;
    color: #4a90e2;
    text-decoration: none;
}

/* 登录按钮 */
.auth-btn {
    width: 100%;
    padding: 12px;
    background: #4a90e2;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    transition: background 0.3s, transform 0.2s;
    margin-top: 10px;
}

.auth-btn:hover {
    background: #357abd;
}

.auth-btn:active {
    transform: scale(0.98);
}

/* 页脚跳转 */
.auth-footer {
    text-align: center;
    margin-top: 25px;
    font-size: 0.9rem;
    color: #666;
}

.auth-footer a {
    color: #4a90e2;
    text-decoration: none;
    font-weight: bold;
}

/* 手机端适配：卡片在小屏幕上占满宽度 */
@media (max-width: 480px) {
    .auth-card {
        padding: 30px 20px;
    }
}
/* =========================================
   精简版 auth.css - 更加紧凑专业
   ========================================= */

:root {
    --primary: #4a90e2;
    --primary-hover: #357abd;
    --bg-color: #f4f7f9;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: "PingFang SC", sans-serif;
    background: var(--bg-color);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px 0; /* 给移动端留点上下边距 */
}

.auth-container {
    width: 100%;
    max-width: 380px; /* 稍微调窄一点更精致 */
    padding: 0 15px;
}

.back-to-home { margin-bottom: 10px; }
.back-to-home a { color: #888; font-size: 0.85rem; text-decoration: none; }

/* 登录/注册卡片 */
.auth-card {
    background: #fff;
    padding: 25px 30px; /* 缩小内边距 */
    border-radius: 12px;
    box-shadow: 0 8px 20px rgba(0,0,0,0.06);
}

.auth-header { text-align: center; margin-bottom: 20px; }
.auth-header h2 { font-size: 1.5rem; color: #333; margin-bottom: 5px; }
.auth-header p { font-size: 0.8rem; color: #999; }

/* 表单列间距缩小 */
.input-group {
    margin-bottom: 12px; /* 关键改动：将之前的 20px 缩小到 12px */
}

.input-group label {
    display: block;
    margin-bottom: 4px; /* 缩小标签和输入框的间距 */
    font-size: 0.85rem;
    color: #444;
}

.input-group input {
    width: 100%;
    padding: 10px 12px; /* 减小输入框高度 */
    border: 1px solid #e0e0e0;
    border-radius: 6px;
    font-size: 0.9rem;
    outline: none;
    transition: border 0.3s;
}

.input-group input:focus { border-color: var(--primary); }

/* 验证码紧凑布局 */
.verification-code-group .code-input-wrapper {
    display: flex;
    gap: 8px;
}

.send-code-btn {
    padding: 0 12px;
    background: #f0f2f5;
    border: 1px solid #ddd;
    border