:root {
    --dark-bg: #F8F9FA;
    --darker-bg: #FFFFFF;
    --accent-color: #1E1E2D;
    --accent-hover: #2B2B3C;
    --text-color: #2B2B3C;
    --text-muted: #718096;
    --text-light: #FFFFFF;
    --border-color: #E2E8F0;
    --card-bg: #FFFFFF;
}

/* 認証画面のスタイル */
body {
    background-color: var(--dark-bg);
    color: var(--text-color);
    min-height: 100vh;
    font-family: 'Plus Jakarta Sans', sans-serif;
    font-size: 0.875rem;
}

/* コンテナスタイル */
.auth-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
}

/* ロゴスタイル */
.auth-logo {
    text-decoration: none;
    color: var(--text-color);
    font-size: 1.1rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.auth-logo:hover {
    color: var(--accent-color);
    transform: translateY(-2px);
    transition: all 0.3s ease;
}

.auth-logo i {
    color: var(--accent-color);
    font-size: 1.25rem;
}

/* コンテンツスタイル */
.auth-content {
    width: 100%;
    max-width: 100%;
    margin: 0 auto;
}

.auth-content .card {
    background: var(--card-bg);
    border: none;
    border-radius: 15px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.05);
}

.auth-content .card-header {
    background-color: transparent;
    border-bottom: 1px solid var(--border-color);
    padding: 1.5rem 2rem 1rem;
}

.auth-content .card-header h4 {
    color: var(--text-color);
    font-weight: 600;
    font-size: 1.1rem;
    margin: 0;
}

.auth-content .card-body {
    padding: 2rem;
}

.auth-footer {
    margin-top: 2rem;
    color: var(--text-muted);
}

/* フォームスタイル */
.form-floating {
    margin-bottom: 1rem;
}

.form-floating > .form-control {
    border-color: var(--border-color);
    padding: 1rem 0.75rem;
}

.form-floating > .form-control:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 0.25rem rgba(30, 30, 45, 0.1);
}

.form-floating > label {
    padding: 1rem 0.75rem;
    color: var(--text-muted);
}

.form-check-input:checked {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
}

.form-check-label {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.btn-login, .btn-primary {
    background: linear-gradient(135deg, var(--accent-color), var(--accent-hover));
    border: none;
    color: var(--text-light);
    border-radius: 12px;
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    width: 100%;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(30, 30, 45, 0.2);
    text-transform: none;
    letter-spacing: 0.5px;
}

.btn-login:hover, .btn-primary:hover {
    background: linear-gradient(135deg, var(--accent-hover), var(--accent-color));
    color: var(--text-light);
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(30, 30, 45, 0.3);
}

/* 未ログイン時の専用レイアウト */
.auth-wrapper {
    min-height: 100vh;
    background-color: var(--dark-bg);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 2rem;
}

.auth-wrapper .auth-content {
    width: 100%;
    max-width: 500px;
    margin: 0 auto;
}

.auth-wrapper .auth-content .card {
    background: var(--card-bg);
    border: none;
    border-radius: 15px;
    box-shadow: 0 0 30px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

.auth-wrapper .auth-content .card-header {
    background: transparent;
    color: var(--text-color);
    text-align: center;
    padding: 1.5rem 2rem 1rem;
    border-bottom: 1px solid var(--border-color);
}

.auth-wrapper .auth-content .card-header h4 {
    color: var(--text-muted);
    font-weight: 500;
    font-size: 1.2rem;
    margin: 0;
}

.auth-wrapper .auth-content .card-body {
    padding: 2.5rem;
}

/* ロゴスタイル（未ログイン時） */
.auth-wrapper .auth-logo {
    margin-bottom: 2rem;
    font-size: 2rem;
    font-weight: 700;
    text-decoration: none;
    color: var(--accent-color);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
}

.auth-wrapper .auth-logo i {
    font-size: 2.5rem;
}

/* レスポンシブ設定 */
@media (min-width: 992px) {
    .auth-container {
        padding: 3rem;
    }
    .auth-content {
        width: 60%;
        max-width: 800px;
    }
}

@media (min-width: 768px) and (max-width: 991px) {
    .auth-container {
        padding: 2rem;
    }
    .auth-content {
        width: 80%;
        max-width: 700px;
    }
    .auth-wrapper {
        padding: 1.5rem;
    }
}

@media (max-width: 767px) {
    .auth-container {
        padding: 1.5rem;
    }
    .auth-content {
        width: 100%;
    }
    .auth-wrapper {
        padding: 1rem;
    }
    .auth-wrapper .auth-content {
        max-width: 100%;
    }
    .auth-wrapper .auth-logo {
        font-size: 1.5rem;
        margin-bottom: 1.5rem;
    }
    .auth-wrapper .auth-logo i {
        font-size: 2rem;
    }
}