body {
            margin: 0;
            min-height: 100vh;
            display: grid;
            place-items: center;
            background: linear-gradient(135deg, #20333d, #edf2f5 70%);
            font-family: "Segoe UI", Tahoma, Arial, sans-serif;
            color: #2f3b43;
        }

        .login-card {
            width: min(420px, calc(100vw - 32px));
            padding: 28px;
            border: 1px solid #d7dde2;
            background: rgba(255, 255, 255, 0.96);
            box-shadow: 0 24px 60px rgba(25, 42, 51, 0.18);
        }

        .login-brand {
            margin-bottom: 18px;
        }

        .login-brand strong {
            display: block;
            font-size: 22px;
        }

        .login-brand span {
            display: block;
            margin-top: 6px;
            color: #6f7d86;
            font-size: 13px;
        }

        .login-field {
            display: grid;
            gap: 6px;
            margin-bottom: 14px;
        }

        .login-field label {
            font-size: 13px;
            color: #5b6770;
        }

        .login-field input {
            height: 42px;
            border: 1px solid #c0c8cf;
            padding: 0 12px;
            font: inherit;
        }

        .login-button {
            width: 100%;
            height: 42px;
            border: 1px solid #556972;
            background: #556972;
            color: white;
            font: inherit;
            font-weight: 600;
            cursor: pointer;
        }

        .login-error {
            margin-bottom: 14px;
            padding: 10px 12px;
            border: 1px solid #e5b8b4;
            background: #fff1f0;
            color: #9b322d;
            font-size: 13px;
        }