* {
    box-sizing: border-box;
}

html, body {
    height: 100%;
    margin: 0;
}

body {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px;
    font-family: "Segoe UI", "Yu Gothic UI", Meiryo, sans-serif;
    font-size: 14px;
    color: #1f2328;
    background: #f6f8fa;
}

.login {
    width: 100%;
    max-width: 360px;
    padding: 28px 28px 32px;
    background: #fff;
    border: 1px solid #d0d7de;
    border-radius: 8px;
}

.login h1 {
    margin: 0 0 20px;
    font-size: 20px;
    text-align: center;
}

.login label {
    display: block;
    margin: 14px 0 6px;
    font-weight: 600;
}

.login input {
    width: 100%;
    height: 40px;
    padding: 0 10px;
    font: inherit;
    font-size: 16px; /* iOS は 16px 未満の入力欄をタップすると画面が拡大される */
    border: 1px solid #d0d7de;
    border-radius: 6px;
}

.login input:focus {
    outline: 2px solid #0969da;
    outline-offset: -1px;
}

.login button {
    width: 100%;
    height: 36px;
    margin-top: 22px;
    font: inherit;
    font-weight: 600;
    color: #fff;
    background: #0969da;
    border: none;
    border-radius: 6px;
    cursor: pointer;
}

.login button:hover {
    background: #0757ba;
}

.login .message {
    margin: 0 0 20px;
    color: #59636e;
    line-height: 1.7;
}

.login a.button {
    display: block;
    height: 40px;
    line-height: 40px;
    color: #fff;
    font-weight: 600;
    text-align: center;
    text-decoration: none;
    background: #0969da;
    border-radius: 6px;
}

.login .sub-link {
    margin: 18px 0 0;
    text-align: center;
    font-size: 13px;
}

.login .sub-link a {
    color: #0969da;
}

.login .error {
    margin: 0 0 4px;
    padding: 8px 10px;
    color: #cf222e;
    background: #fff1f0;
    border: 1px solid #ffcecb;
    border-radius: 6px;
}

.login button.secondary {
    margin-top: 12px;
    color: #0969da;
    background: #fff;
    border: 1px solid #0969da;
}

.login button.secondary:hover {
    background: #ddf4ff;
}

.login button[hidden],
.login .error[hidden] {
    display: none;
}

.login .hint-small {
    margin: 6px 0 0;
    color: #59636e;
    font-size: 12px;
    line-height: 1.6;
}