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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f5f7fa;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    color: #334155;
}

/* 登录卡片样式 */
.login-card {
    background-color: white;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    max-width: 400px;
    width: 100%;
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

    .login-card:hover {
        box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
        transform: translateY(-5px);
    }

/* 卡片头部样式 */
.card-header {
    background: linear-gradient(135deg, #3b82f6, #8b5cf6);
    color: white;
    padding: 30px;
    text-align: center;
    position: relative;
}

    .card-header::before {
        content: '';
        position: absolute;
        bottom: -20px;
        left: 50%;
        transform: translateX(-50%);
        width: 40px;
        height: 40px;
        background-color: white;
        border-radius: 50%;
    }

    .card-header h2 {
        margin-bottom: 8px;
        font-weight: 600;
        font-size: 24px;
    }

    .card-header p {
        opacity: 0.8;
        font-size: 14px;
    }

/* 卡片主体样式 */
.card-body {
    padding: 40px 30px 30px;
    position: relative;
}

/* 表单元素样式 */
.form-group {
    margin-bottom: 20px;
    position: relative;
}

    .form-group label {
        display: block;
        font-size: 14px;
        font-weight: 500;
        margin-bottom: 8px;
        color: #334155;
    }

.form-control {
    width: 100%;
    padding: 12px 40px 12px 15px;
    border: 1px solid #d1d5db;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

    .form-control:focus {
        outline: none;
        border-color: #3b82f6;
        box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
    }

/* 自定义图标样式 */
.input-icon {
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: #9ca3af;
    font-size: 18px;
}

    .input-icon::before {
        content: attr(data-icon); /* 通过data-icon属性自定义图标文本 */
    }

/* 密码显示/隐藏按钮 */
.password-toggle {
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: #9ca3af;
    cursor: pointer;
    font-size: 18px;
    outline: none;
}

/* 表单验证状态样式 */
.form-control.success {
    border-color: #10b981;
}

.form-control.error {
    border-color: #ef4444;
}

.error-message {
    margin-top: 5px;
    color: #ef4444;
    font-size: 13px;
    display: none;
}

    .error-message.active {
        display: block;
    }

/* 记住我样式 */
.remember-me {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 25px;
}

    .remember-me label {
        display: flex;
        align-items: center;
        cursor: pointer;
    }

    .remember-me input {
        margin-right: 8px;
    }

    .remember-me a {
        color: #3b82f6;
        text-decoration: none;
        font-size: 14px;
        transition: color 0.3s ease;
    }

        .remember-me a:hover {
            color: #2563eb;
        }

/* 按钮样式 */
.btn {
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.btn-primary {
    background-color: #3b82f6;
    color: white;
}

    .btn-primary:hover {
        background-color: #2563eb;
    }

/* 底部链接样式 */
.login-footer {
    text-align: center;
    margin-top: 20px;
    font-size: 14px;
}

    .login-footer a {
        color: #3b82f6;
        text-decoration: none;
        font-weight: 500;
    }

        .login-footer a:hover {
            text-decoration: underline;
        }

/* 响应式适配 */
@media (max-width: 420px) {
    .card-body {
        padding: 30px 20px 20px;
    }

    .form-control {
        padding: 12px 35px 12px 15px;
    }
}