body {
    background: linear-gradient(to bottom, #f0fbff, #ffffff);
}

/* コンテナ */
.feedback-container {
    max-width: 700px;
    margin: 80px auto;
    padding: 20px;
}

/* カード */
.feedback-card {
    background: #ffffff;
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 15px 40px rgba(0, 160, 220, 0.08);
    border: 1px solid rgba(0, 180, 255, 0.08);
}

/* ヘッダー */
.feedback-header {
    text-align: center;
    margin-bottom: 30px;
}

.feedback-badge {
    display: inline-block;
    padding: 6px 14px;
    font-size: 12px;
    background: rgba(0, 180, 255, 0.1);
    color: #00a8e8;
    border-radius: 999px;
    margin-bottom: 12px;
    letter-spacing: 1px;
}

.feedback-title {
    font-size: 22px;
    margin-bottom: 10px;
}

.feedback-recipient {
    font-size: 14px;
    color: #555;
}

/* フォーム */
.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
}

textarea {
    width: 100%;
    padding: 16px;
    border-radius: 12px;
    border: 1px solid #dbeafe;
    background: #f9fdff;
    font-size: 15px;
    resize: vertical;
    transition: 0.25s;
}

textarea:focus {
    border-color: #00b4ff;
    outline: none;
    box-shadow: 0 0 0 4px rgba(0, 180, 255, 0.15);
}

/* 公開非公開 */
.form-group.inline {
    display: flex;
    gap: 20px;
}

.radio-option {
    font-size: 14px;
    cursor: pointer;
}

/* ボタン */
.form-actions {
    display: flex;
    justify-content: space-between;
    margin-top: 30px;
}

.btn {
    padding: 12px 22px;
    border-radius: 999px;
    font-weight: 600;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: 0.25s;
}

.btn.cancel {
    background: #e5f6ff;
    color: #008acb;
}

.btn.cancel:hover {
    background: #d6f0ff;
}

.btn.submit {
    background: linear-gradient(135deg, #00b4ff, #0095e6);
    color: white;
    box-shadow: 0 8px 20px rgba(0, 180, 255, 0.25);
}

.btn.submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 28px rgba(0, 180, 255, 0.35);
}