body {
    margin: 0;
    padding: 0;
    background: #f6f7f9;
    color: #222;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Yu Gothic", "YuGothic", "Meiryo", sans-serif;
    font-size: 17px;
    line-height: 1.7;
}

.container {
    max-width: 820px;
    width: 92%;
    margin: 32px auto 56px;
    padding: 28px 34px;
    background: #fff;
    border: 1px solid #ddd;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.04);
}

h1 {
    margin: 0 0 22px;
    padding-bottom: 12px;
    border-bottom: 2px solid #333;
    font-size: 26px;
    line-height: 1.35;
}

h2 {
    margin-top: 30px;
    font-size: 21px;
    border-left: 5px solid #555;
    padding-left: 10px;
}

.notice {
    padding: 14px 18px;
    background: #f2f5fb;
    border: 1px solid #d5ddeb;
    border-radius: 8px;
    margin-bottom: 22px;
}

.form-row {
    margin: 22px 0;
}

label.main-label {
    display: block;
    font-weight: 700;
    margin-bottom: 7px;
}

.required {
    display: inline-block;
    margin-left: 6px;
    padding: 1px 7px;
    border-radius: 999px;
    background: #b42318;
    color: #fff;
    font-size: 13px;
    font-weight: 700;
}

input[type="text"], input[type="email"], select, textarea {
    box-sizing: border-box;
    width: 100%;
    max-width: 680px;
    padding: 9px 11px;
    font-size: 17px;
    border: 1px solid #aaa;
    border-radius: 6px;
    background: #fff;
}

textarea {
    min-height: 90px;
    resize: vertical;
}

.radio-group label,
.checkbox-group label {
    display: block;
    margin: 7px 0;
}

.help {
    margin-top: 5px;
    color: #555;
    font-size: 15px;
}

.button-row {
    margin-top: 30px;
}

button[type="submit"] {
    min-width: 220px;
    padding: 11px 24px;
    border: 0;
    border-radius: 8px;
    background: #333;
    color: #fff;
    font-size: 18px;
    font-weight: 700;
    cursor: pointer;
}

button[type="submit"]:hover {
    background: #111;
}

.error-box {
    padding: 14px 18px;
    background: #fff3f1;
    border: 1px solid #e3aaa2;
    border-radius: 8px;
    color: #7a1f17;
    margin: 18px 0 24px;
}

.done-box {
    padding: 18px 20px;
    background: #f0fff4;
    border: 1px solid #a5d6a7;
    border-radius: 8px;
    font-size: 18px;
    font-weight: 700;
}

.hp {
    position: absolute !important;
    left: -10000px !important;
    top: auto !important;
    width: 1px !important;
    height: 1px !important;
    overflow: hidden !important;
}

a {
    color: #0645ad;
}

@media (max-width: 600px) {
    body { font-size: 16px; }
    .container {
        width: auto;
        margin: 0;
        padding: 20px 16px 36px;
        border: none;
        border-radius: 0;
    }
    h1 { font-size: 22px; }
    button[type="submit"] { width: 100%; }
}