body {
            font-family: 'Inter', 'Noto Sans JP', sans-serif;
            background-color: #f8fafc;
            min-height: 100vh;
            margin: 0;
            display: flex;
            justify-content: center;
            align-items: center;
            color: #1e293b;
        }

        .login-container {
            background-color: #ffffff;
            border: 2px solid #b8c4d0;
            border-radius: 12px;
            padding: 40px;
            width: 100%;
            max-width: 400px;
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
            box-sizing: border-box;
        }

        .logo-area {
            text-align: center;
            margin-bottom: 32px;
        }

        .logo-title {
            font-size: 24px;
            font-weight: 700;
            margin: 0;
            color: #0f172a;
        }



        .form-group {
            margin-bottom: 20px;
        }

        .form-label {
            display: block;
            font-size: 13px;
            font-weight: 600;
            color: #475569;
            margin-bottom: 6px;
        }

        .form-input {
            width: 100%;
            padding: 12px 14px;
            border: 2px solid #cbd5e1;
            border-radius: 8px;
            background-color: #ffffff;
            color: #0f172a;
            font-size: 15px;
            box-sizing: border-box;
            outline: none;
            transition: border-color 0.2s, box-shadow 0.2s;
        }

        .form-input::placeholder {
            color: #94a3b8;
        }

        .form-input:focus {
            border-color: #4f79a5;
            box-shadow: 0 0 0 3px rgba(79, 121, 165, 0.15);
        }

        .btn-submit {
            width: 100%;
            padding: 12px;
            background-color: #4f79a5;
            border: none;
            border-radius: 8px;
            color: #ffffff;
            font-size: 15px;
            font-weight: 700;
            cursor: pointer;
            transition: background-color 0.2s;
            margin-top: 8px;
        }

        .btn-submit:hover {
            background-color: #456b95;
        }

        .error-banner {
            background-color: #fef2f2;
            border: 1px solid #fca5a5;
            color: #991b1b;
            padding: 12px 14px;
            border-radius: 8px;
            font-size: 13px;
            margin-bottom: 20px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .error-icon {
            display: flex;
            align-items: center;
            color: #dc2626;
        }