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

/*全体*/
body {
    font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
    background: #0a0a0c;
    color: #ddd;
    line-height: 1.7;
}

/*フォーム*/
form {
    max-width: 720px;
    margin: 80px auto;
    padding: 34px 28px;

    background: linear-gradient(
        160deg,
        rgba(20,20,22,0.95),
        rgba(10,10,12,0.95)
    );

    border: 1px solid rgba(212,180,106,0.35); /* 金枠 */
    border-radius: 6px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.8);
}

.forms {
    margin-bottom: 26px;
}

.forms label {
    display: block;
    margin-bottom: 6px;
    font-weight: 600;
    color: #d4b46a;
    letter-spacing: 0.6px;
}

.required {
    color: #d4b46a;
}

.forms input[type="text"],
.forms input[type="email"],
.forms textarea {
    width: 100%;
    padding: 12px 14px;

    background: #0f0f12;
    color: #eee;

    border: 1px solid rgba(212,180,106,0.4);
    border-radius: 4px;

    font-size: 15px;
}

.forms input:focus,
.forms textarea:focus {
    outline: none;
    border-color: #d4b46a;
    box-shadow: 0 0 10px rgba(212,180,106,0.35);
}

.error-message {
    margin-top: 6px;
    font-size: 13px;
    color: #e06c6c;
}

.btn {
    padding: 12px 22px;
    font-weight: 700;
    letter-spacing: 1px;
    cursor: pointer;
    border-radius: 4px;
    border: none;
    transition: all 0.25s ease;
}

.check-btn {
    background: transparent;
    color: #d4b46a;
    border: 1px solid rgba(212,180,106,0.5);
    margin-right: 12px;
}

.check-btn:hover {
    background: rgba(212,180,106,0.15);
    box-shadow: 0 0 12px rgba(212,180,106,0.4);
}

.submit-btn {
    background: linear-gradient(
        180deg,
        #e3c67c,
        #b89a4d
    );
    color: #111;
}

.submit-btn:hover {
    box-shadow: 0 0 18px rgba(212,180,106,0.8);
    transform: translateY(-1px);
}

@media (max-width: 640px) {
    form {
        margin: 40px 14px;
        padding: 22px;
    }

    .btn {
        width: 100%;
        margin-bottom: 12px;
    }
}