/* ==========================================================================
           DISEÑO PROFESIONAL DE PANTALLA DE ACCESO (LOGIN)
           ========================================================================== */
        :root {
            --color-login-base: #1e293b;
            --color-login-accent: #4182d0;
            --color-login-bg: #f1f5f9;
            --color-login-text: #334155;
            --color-login-muted: #64748b;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
            user-select: none;
        }

        body {
            background-color: var(--color-login-bg);
            color: var(--color-login-text);
            display: flex;
            align-items: center;
            justify-content: center;
            min-height: 100vh;
            padding: 20px;
        }

        .login-card {
            background-color: #ffffff;
            width: 100%;
            max-width: 400px;
            padding: 40px 30px;
            border-radius: 8px;
            box-shadow: 0 10px 25px rgba(30, 41, 59, 0.1);
            border-top: 4px solid var(--color-login-accent);
            text-align: center;
        }

        .login-logo h2 {
            font-size: 22px;
            color: var(--color-login-base);
            font-weight: 800;
            margin-bottom: 4px;
        }

        .login-logo p {
            font-size: 13px;
            color: var(--color-login-muted);
            margin-bottom: 30px;
        }

        .login-form {
            display: flex;
            flex-direction: column;
            gap: 20px;
            text-align: left;
        }

        .campo-grupo {
            display: flex;
            flex-direction: column;
            gap: 6px;
        }

        .campo-grupo label {
            font-size: 13px;
            font-weight: 600;
            color: var(--color-login-text);
        }

        .campo-grupo input {
            width: 100%;
            padding: 12px;
            font-size: 14px;
            border: 1px solid #cbd5e1;
            border-radius: 6px;
            background-color: #ffffff;
            outline: none;
            transition: border-color 0.2s, box-shadow 0.2s;
        }

        .campo-grupo input:focus {
            border-color: var(--color-login-accent);
            box-shadow: 0 0 0 3px rgba(65, 130, 208, 0.15);
        }

        .error-alerta {
            background-color: #fee2e2;
            color: #991b1b;
            font-size: 13px;
            padding: 12px;
            border-radius: 6px;
            margin-bottom: 20px;
            text-align: left;
            font-weight: 600;
            border: 1px solid #fca5a5;
        }

        .btn-ingresar {
            width: 100%;
            background-color: var(--color-login-accent);
            color: white;
            border: none;
            padding: 14px;
            font-size: 15px;
            font-weight: 700;
            border-radius: 6px;
            cursor: pointer;
            transition: background-color 0.2s;
            margin-top: 10px;
        }

        .btn-ingresar:hover {
            background-color: var(--color-login-base);
        }

        .link-retorno {
            display: inline-block;
            margin-top: 25px;
            font-size: 12px;
            color: var(--color-login-muted);
            text-decoration: none;
        }

        .link-retorno:hover {
            color: var(--color-login-accent);
        }