/* 基本レイアウト */
body {
    font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
    background-color: #f0f2f5;
    margin: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh; /* 画面中央に配置 */
}

/* ログインカード */
.box {
    width: 100%;
    max-width: 400px;
    padding: 40px;
    background: #ffffff;
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
    box-sizing: border-box;
}

h2 {
    text-align: center;
    margin-top: 0;
    margin-bottom: 25px;
    color: #1a1a1a;
    font-size: 24px;
}

/* エラーメッセージ */
.error {
    color: #d93025;
    background: #fce8e6;
    padding: 12px;
    border-radius: 6px;
    margin-bottom: 20px;
    font-size: 14px;
    border: 1px solid #f5c2c7;
}

/* フォーム要素 */
.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #444;
    font-size: 14px;
}

input {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 6px;
    box-sizing: border-box;
    font-size: 16px;
    transition: border-color 0.2s;
}

input:focus {
    border-color: #007bff;
    outline: none;
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.1);
}

/* ボタン */
button {
    width: 100%;
    padding: 12px;
    background: #007bff;
    color: #fff;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 16px;
    font-weight: bold;
    transition: background 0.2s;
}

button:hover {
    background: #0056b3;
}

/* リンク */
.links {
    text-align: center;
    margin-top: 20px;
    font-size: 14px;
}

.links a {
    color: #007bff;
    text-decoration: none;
}

.links a:hover {
    text-decoration: underline;
}

/* JS警告用 */
.js-warning {
    background: white;
    padding: 40px;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}