/* 1. 表单整体容器 */
.royal-contact-form {
    max-width: 600px;
    margin: 0 auto;
    padding: 40px;
    background: #ffffff;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(27, 58, 107, 0.08); /* 带有品牌色的柔和阴影 */
}

/* 2. 表单项组 */
.royal-form-group {
    position: relative;
    margin-bottom: 28px;
}

/* 3. 输入框与文本域基础样式 */
.royal-form-group input,
.royal-form-group textarea {
    width: 100%;
    padding: 16px 12px 8px; /* 上边距留大一点，给悬浮标签腾出空间 */
    font-size: 16px;
    border: 1px solid #d1d5db;
    border-radius: 8px;
    outline: none;
    background: #f9fafb;
    transition: all 0.3s ease;
    box-sizing: border-box; /* 防止 padding 撑破布局 */
}

.royal-form-group textarea {
    resize: vertical; /* 允许垂直拉伸 */
    min-height: 120px;
}

/* 4. 聚焦状态（高亮边框与背景） */
.royal-form-group input:focus,
.royal-form-group textarea:focus {
    border-color: #1B3A6B;
    background: #ffffff;
    box-shadow: 0 0 0 3px rgba(27, 58, 107, 0.1);
}

/* 5. 悬浮标签（Floating Label）核心逻辑 */
.royal-form-group label {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 16px;
    color: #6b7280;
    pointer-events: none; /* 让鼠标点击能穿透标签到达输入框 */
    transition: all 0.2s ease;
    background: transparent;
}

/* 文本域的标签初始位置靠上 */
.textarea-group label {
    top: 16px;
    transform: none;
}

/* 当输入框获得焦点，或包含内容时，标签上浮并缩小 */
.royal-form-group input:focus + label,
.royal-form-group input:not(:placeholder-shown) + label,
.royal-form-group textarea:focus + label,
.royal-form-group textarea:not(:placeholder-shown) + label {
    top: 8px;
    transform: none;
    font-size: 12px;
    color: #1B3A6B;
    font-weight: 600;
}

/* 6. 提交按钮样式 */
.royal-btn-primary {
    width: 100%;
    padding: 16px;
    font-size: 18px;
    font-weight: 600;
    color: #ffffff;
    background: linear-gradient(135deg, #1B3A6B 0%, #2E6DB4 100%);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    letter-spacing: 1px;
}

.royal-btn-primary:hover {
    background: linear-gradient(135deg, #142d54 0%, #1B3A6B 100%);
    box-shadow: 0 6px 15px rgba(27, 58, 107, 0.3);
    transform: translateY(-2px); /* 悬浮微动效 */
}

.royal-btn-primary:active {
    transform: translateY(0);
}